Arduino Sd Card Read Problem

The SanDisk ImageMate® PRO Multi-Card Reader/Writer works with SD™ and microSD™ cards as well as CompactFlash® cards. Arduino users can. Secure Digital and CompactFlash card reviews from several brands. Seems to be a problem with the used sd lib? Try to comment out only the method saveFilenameOnSD (. A problem in open mapping theoram from Kreyszig Section 4. Note that a filesystem (e. Each of the boards is a full Arduino board programmable using the Arduino IDE. I can play audio files which are in appropriate format and read and the print contents of text files. I thought I understood the problem but kept getting compile errors. Switch (SW) Pin The flash socket has a switch that can detect when a card is inserted. Carefully attach the Wave shield to the Arduino. PocketScreen's best feature is the combination of microcontroller, color OLED screen, micro SD card reader, hotkey buttons, RGB status light, and charging module. Included libraries and example code for both SD and RTC, means you can get going quickly. Of course, the Mega Sensor Shield isn't essential to interfacing the SD Card module to the Arduino Mega, however, it absolutely makes life easier and adds reliability to your device. Click on USB (or Card Reader if using an in-built SD card reader) then search for your SD card in the upper right section of the window; click it, then search for BSD name in the lower right section: must be something like diskn where n is a number (for example, disk4). A while back I posted about using the 4x4 Universal 16 Key Keypad for Arduino. Setting up the Ai-Thinker ESP32-CAM with the Arduino IDE Camera Web Server example. Buy Arduino Micro SD Card Module TF Card Reader Card Reader SPI Interfaces with Level Converter Chip: Replacement Parts - Amazon. Arduino Ethernet+SD Using the Arduino to browse files on an SD card remotely. This command lists all of the hard drives, CDs, DVDs, floppies, SD cards, etc that Ubuntu knows about. Insert a valid SIM card and connect the Arduino with Arduino IDE. It has a micro-SD card slot, which can be used to store files for serving over the network. The differences are most certainly obvious now. A Serial Peripheral Interface (SPI) bus is a system for serial communication, which uses up to four conductors, commonly three. The SD card module is a very useful module to add storage space to. This is a 5V Arduino running the 16MHz bootloader. The SD card can be removed from the Arduino and inserted into an SD card reader attached to a PC to view the requested file. Not all devices support microSDXC memory card formats. Arduino users can. If you only use the ribbon cabled plugged directly into the board it will not include the SD card pins (see point 12). Note that this change does not affect operation of '328 boards. The other half of the data logger shield is the SD card. Moreover, you can use them for photographic lenses, track balls, opto mechanical mice, and, of course, Arduino projects. This sketch reads the value from three analog input points and writes it to a text file. In fact, it is considered best practice to format your SD card now and then to boost. In the SD library initialization, 80 clocks are sent with chip select high to prep the SD card, as another example where transactions to not necessarily correspond to chip selects. In fact, any voltages exceeding 3. Give the button thing a try, and good luck, the SD card reader and library are touchy. SD cards and USB flash drives have become an indispensable things in our everyday life. Traffic engineering uses engineering methods and techniques to achieve the safe and time efficient movement of people and goods on roadways. Very useful for testing a card when you're not sure whether its working or not. Bluetooth is one of the popular wireless communication technologies because of its low power consumption, low cost and a light stack but compensates on range. So if you are going with this method, you may connect the Tx pin of GSM module to Rx pin of Arduino and Rx pin of GSM module to Tx pin of Arduino. Disclosures. send_op_cond is the first command sent to the card. If i use this code, i'm getting problem with SD card. If you have a very small SD card, say 8-32 Megabytes you might. I’m using Arduino UNO and SD card and some resistors for voltage divider. Pretty simple. Maixduino is a low power low cost Arduino compatible AI edge board based on K210 RISC-V AI processor, and ESP32 module for WiFi and Bluetooth connectivity. Firstly, circuit was set up as in picture: I am using 8 Gb micro SDHC card with SD adapter. I think it can only address ~2G. First, open the “Datalogger” example sketch (File > Examples > SD > Datalogger) and upload it to Arduino. With the Yun, not only can you do all the hardware hacking that you’d expect from an Arduino, but you can also connect it to the Internet and run programs in your favorite scripting language. The process to format is fairly straightforward. Probably Arduino’s limited amount of ram might be a problem – 640 Neopixels consume about 2kByte of memory. Prepare the Arduino SD card. Imagine that you have the Arduino taking measurements and send them to the Raspberry PI to work on the data – a web server for example. The circuit: * SD card attached to SPI bus as follows: ** MOSI - pin 11 on Arduino Uno/Duemilanove/Diecimila. Datalogger - How to log data from three analog sensors to an SD card. If you look at eBay, or for example Amazon, for an Arduino ENC28J60 Ethernet shield, then you’ll notice that there are plenty models variations. CompactFlash tests the latest high-speed UDMA 7 compatible cards. Desktops are more forgiving of nonstandard SD card formats such as GPT based formats. More information about the project can be. Everything worked fine using the standard SD library that comes with the Arduino IDE, but my project is going to require 2 SD card readers, which means I have to switch over to SdFat for the multicard support. In this case, the Customer Care team will remove your account from auto-renewal to ensure you are not charged for an additional year and you can continue to use the subscription until the end of your subscription term. Your SD card reader is faulty. Some SD cards will refuse to work at all with your Raspberry Pi. In many cases. The advantage of Arduino is that if you have the exact hardware that Arduino uses (an ATmega16u2 with a bootloader installed) and also the specific Arduino library for your peripheral (the SD card), then you have an excellent chance of having the library's demo programs compile and run correctly. The SD card can be removed from the Arduino and inserted into an SD card reader attached to a PC to view the requested file. 04 (MathWorks Release R2014b)! Instructions: (1) Unzip the file. 8 Arduino UNO WiFi Rev2 boards: It's basically an Arduino Uno Rev3 with more kick, as it adds and an onboard IMU (Inertial Measurement Unit) and WiFi connection for instance. Deals on Apple electronics used to be scarce and hard to find. Be sure to use an SD card for storage or you will quickly fill the Arduino internal storage. Arduino DIY SD Card Logging Shield: Ready-made SD card logging shields for the Arduino typically cost in the range of $15 - $25. All of the standard Arduino functions (digitalWrite, pinMode, analogRead, etc) all work on Teensy. 0 Micro SD and SD Card Reader CRUMSS. I have loaded the sketch provided in the practical arduino and everything works fine. Let the reader and the tag closer until all the information is displayed. Problems such as intermittent hanging of an Arduino sketch can occur when using the Arduino Ethernet shield with an uninitialized SD card plugged into the SD card socket of the shield. It consists of a 1602 white character blue backlight LCD. For the hack, Brocious simply plugged in his programmed Arduino microcontroller into the socket, which let him read the key from the lock's stored memory. This is an awesome kit, complete with everything you'd need to either get started, or advance your arduino experience. 32GB) will only work of very modern card readers. Reading a control encoder with an Arduino is actually fairly straightforward. 0000N Long: 12100. But it’s not designed for battery power! For example, the Raspberry Pi Model 3B does not have a direct battery input and consumes around 50 0mA of current during normal operation. Here is the layout. The SD card module is specially useful for projects that require data logging. h arduino library performs at the expense of using about 50% of the atmega328p program space. When playing with data (saving measurement, reading or writing to a file, etc. The arduino LCD Keypad shield is developed for Arduino compatible boards, to provide a user-friendly interface that allows users to go through the menu, make selections etc. Reading and Writing Files from an SD Card with an Arduino 4 years ago by Tim Youngblood In some Arduino applications, it is advantageous to be able to store and retrieve information locally. Some are old hats and tackle the task with aplomb, but for some it strikes fear into their hearts. Next I moved the swap partition to the end of the SD card: Launch gparted from within the GUI (under the Preferences menu), select the swap partition, Partition -> Resize/Move. While this information is useful when programming an ESP8266 from the Arduino IDE, the information must be retrieved if the sketch is to make use of it. Best graphics cards for gamers and creatives in 2019. This tutorial is designed to give you a basic understanding of SD Cards and how to write different images to the SD card of your choice. Looks really nice for my little project. It has more functions than the popular USB Power Meter. Lately, however, we've noticed that Apple sales, on iPads especially, are easier to find and often have the lowest prices we've seen. The file names passed to the SD. Extensive speed tests in card readers as well as in-camera tests are included with each review. If I use pin 10, arduino will ignore any analogWrite request. Traffic engineering uses engineering methods and techniques to achieve the safe and time efficient movement of people and goods on roadways. Sheriff’s deputies radioed for emergency help with a prisoner who tried to grab one deputy’s gun at UC San Diego Medical Center in Hillcrest Saturday night, authorities said. If you don’t have either on your computer, the easiest way to get one is probably to purchase a Micro SD card reader that plugs in via USB. If your PC or Mac doesn't have an SD card slot, you can buy an SD card reader that plugs into your computer's USB port for less than $10. Ideal for automative CAN application. Low price along with free shipping on the Sabrent Mini USB 3. pde sketch (File > Examples > WaveHC), and if it plays, hurrah. Lately, however, we've noticed that Apple sales, on iPads especially, are easier to find and often have the lowest prices we've seen. So: be warned. Some things to keep in mind when using the SD Library Overview. endTransmission() function is called. 3 names for files. CompactFlash tests the latest high-speed UDMA 7 compatible cards. Both boards work just fine, but my main problem is the fact I paid for something and hoping to get the real thing by Arduino themselves, not someone else's cheaper alternative design and still have me pay the full price. I've also tested the "SD Arduino Shield Plus" individually and the read and write and it works on an SD card without problems. Secure Digital and CompactFlash card reviews from several brands. 3v supply for Arduino controller and sensor supply. GRBL Arduino Library – Use the Arduino IDE to flash GRBL directly to your Arduino say that i want to put the g code on an SD card and use the arduino SD shield. what i did is i edit the library specifically the. Its all are DIY Arduino Projects. LCD/SD Ports. For the hack, Brocious simply plugged in his programmed Arduino microcontroller into the socket, which let him read the key from the lock's stored memory. The module works with the standard Arduino SD card library. i had the same problem before. Setting up the Ai-Thinker ESP32-CAM with the Arduino IDE Camera Web Server example. All cards work fine on the computer via a card reader. It delivers transfer speeds of up to 312MB/s for SD and microSD and up to 160MB/s for CompactFlash cards, 1 and it features a USB 3. The code discussed in this article will probably work for all of them. 3 names for files. 31 thoughts on “ HTML Text Box to Send Text to Arduino Web Server ”. The problem could not be solved using compass and ruler because its solution requires taking a cube root (see references at MathWorld). I have not tested this library with all the. h" //Lib to play auido. READ MORE. I hope that you or someone could make an example program that. but I also want to read data from the SD card in my main loop, I’ve got a choice of keeping a global “busy” variable for the SPI bus, or. So we are supposed to use serial pins of Arduino (Rx and Tx). Note that this change does not affect operation of '328 boards. We will show how this is actually hardwared together. Arduino Projects. Each beat is unique and can be tweaked with five knobs. This will most likely be on the side of the computer's casing if it is a laptop, or somewhere on the CPU box if it is a desktop. I am using DHT22 Temperature and Humidity sensor with Arduino UNO R3 and getting it's data from Arduino Serial Monitor. Here is a good guide for understanding lshw which lists an example SD Card reader. You can insert, delete, and update data, call functions, create objects, etc. Build an ethernet web interface for Arduino. After one of the above sketches is loaded to the Arduino, it will connect to the server and fetch the file that has been specified in the sketch and save it to SD card. It is possible to just drag the swap partition to the end of the SD card and apply the changes. However, the Ram problem does not consist with the teena, which has 64kB! Let’s see… Reply. Some SD cards will refuse to work at all with your Raspberry Pi. Arduino Projects. Android App for sending data to Arduino over Bluetooth. How to Address Speed Problems With Your New SD Card: Update 03/04/2015: Added info on WiFi capable SD cards and filesystems. Open the Arduino IDE and select File → Examples → Examples for Spresense Audio → application → recorder. If you are still getting Lat: 2400. But I also know many people have problems with the SD reading. A Serial Peripheral Interface (SPI) bus is a system for serial communication, which uses up to four conductors, commonly three. ESP8266 Arduino tutorial – WiFi module complete review. This tutorial is designed to give you a basic understanding of SD Cards and how to write different images to the SD card of your choice. Batteries have problems. Your SD card reader is faulty. But it has some writing on the bottom, including "www. Mellis modified 9 Apr 2012 by Tom Igoe This example code is in the public domain. So we are supposed to use serial pins of Arduino (Rx and Tx). Ideal for portable, battery powered applications. I've also tested the "SD Arduino Shield Plus" individually and the read and write and it works on an SD card without problems. Harness the power of Bluetooth to communicate with your Arduino! This is part two of a series, which will focus on using Bluetooth to communicate with an Arduino. Price, Promotion, Processing: Pricing, delivery date and other errors may be withdrawn or revised and/or your order may be cancelled at any time before we have both (a) shipped or provided access to your product or service, and (b) received your payment for the product or service. 6 Fix audio library delay effect on Teensy 3. But it seems almost impossible to get the card going. The library supports FAT16 and FAT32 file systems on standard SD cards and SDHC cards. But you could write the signals to an SD card instead, or use some other method to capture the signals ??. If you want to whip up a cocktail, you can measure out the components by hand, or you could use a robotic assistant like this setup by creator Sven Tantau. You may point out that you program your Arduino, which has a USB jack, by plugging it into your computer’s USB port. The micros() function returns the number of microseconds from the time, the Arduino board begins running the current program. However, it says formatting SD card will fix problems like these, but why did we fail to format SD card eventually? We arrived at some simple conclusions that may cause the issue of SD card won't format. This module allows reading and writing of data to a standard SD card and is useful for applications such as data loggers where a large amount of data needs to be stored. The SD card is how we store long term data. Absolute Beginner’s Guide to TFT LCD Displays by Arduino. In this task, you will configure the model to read data from the EEPROM using the SPI WriteRead block. So: be warned. You can then retrieve data o ine when data taking is over. The Arduino can easily create a file in an SD card to write and save data using the SD library. For this Arduino based Smart Watch, we have created a Android App in Android Studio, this app can be downloaded from here. In any case, the communication between Arduino and GSM module is serial. We will begin our rotary encoder experiments using the control encoder. In the case of the Arduino Uno, the processor is the Atmega328, equipped with 1 glorious KByte of EEPROM memory. They are programmable, able to read inputs (e. 3) After also purchasing the matching shield for this screen, I have now been informed by Sainsmart that the touch screen and SD capabilities cannot be used at the same time as the TFT display because Arduino UNO doesn't have enough pins to support all. Popular memory cards include the SD card, CF card, xD-Picture card and Memory Stick. Task 4 - Configure the Model to Write and Read Data using the SPI WriteRead Block. While this information is useful when programming an ESP8266 from the Arduino IDE, the information must be retrieved if the sketch is to make use of it. Each of the boards is a full Arduino board programmable using the Arduino IDE. Five Tips For Finding And Dealing With Any Hidden. i can get away with using the EEPOM instead of an SD card. How to use Visual Basic with the Arduino 2009 board. A problem in open mapping theoram from Kreyszig Section 4. Very useful for testing a card when you're not sure whether its working or not. I’ve spent the last year in the ‘uncanny valley’ of the Arduino. But when the power is off, it usually comes back with a reboot. 3v input (and solder together the 3v joint). Note, finally, that you do not (that's not) have to reformat your FAT32 cards. It might be as simple as a variable name not aligning between the page and the Arduino Post request. What I want to happen is when I click a "Sync Button", it should sync with the SD Card, and store values into an array. Maybe the following articles will help you restore AutoPlay: Windows Vista - Troubleshoot AutoPlay problems. Lately, however, we've noticed that Apple sales, on iPads especially, are easier to find and often have the lowest prices we've seen. However, it says formatting SD card will fix problems like these, but why did we fail to format SD card eventually? We arrived at some simple conclusions that may cause the issue of SD card won't format. 0 interface that can move content up to 10x faster than a USB 2. 04 (MathWorks Release R2014b)! Instructions: (1) Unzip the file. If you then look at the results the Arduino gets back form the main page and there are not 1’s in the HTML the Arduino received then there is an issue with the Arduino Code. It links against AVR Libc and allows the use of any of its functions; see its user manual for details. 3 Storing and Retrieving Numeric Values in Program Memory Problem. The Motor Board controls the motors, and the Control Board reads sensors and decides how to operate. Published on: 27-08-2014 15:32 - Lees in het Nederlands Please note: this article was semi-automatically translated from Dutch, translation errors may occur, links will lead to Dutch websites, you are welcome to comment in English. Management of Arduino’s EEPROM is done by the library that, once included, provides the functions: EEPROM. The Arduino Yun Mini - Review and application example What is the Yun Mini? The Yun Mini is a stripped back, bread board friendly version of the Yun, with no SD card, USB host or RJ45 wired internet. In fact, it is considered best practice to format your SD card now and then to boost. Here is a good guide for understanding lshw which lists an example SD Card reader. If you want the security of having a dash cam in your car, but don’t want to splash the cash, Apeman’s C450 is a great option. Ask questions on the discussion board. Open the Arduino IDE and select File → Examples → Examples for Spresense Audio → application → recorder. It's easy and. Pretty straight forward… All you need to do is connect four wires to the module. The module (MicroSD Card Adapter) is a Micro SD card reader module, and the SPI interface via the file system driver, microcontroller system to complete the MicroSD card read and write files. The SD card can be removed from the Arduino and inserted into an SD card reader attached to a PC to view the requested file. In this post we're going to show you how to use an SD card module with Arduino to read and write files on an SD card. But I also know many people have problems with the SD reading. Nov 01 19:38. The SD card slot may get jammed or blocked by dust or something else. Explore all Samsung External Memory Cards and filter by type, features and price to find the best memory card for you. The following sketch configures Arduino/Arduino clone as serial link between PC and the GPRS Shield(Jumpers on SWserial side). Plus, it re-. One place you might see some benefit, though, is when you go to download the photos from the card to your computer using a card reader. 3 names for files. cc, but still don’t get much from the material on gitHub because trained programmers would never stoop to using the wire. In this article we will focus on selecting a good ethernet library for the ENC28J60 and run a “Hello World” example. This is a problem as I need to format a micro sd card for my child's Nintendo game console and this cannot be done. 4" color TFT LCD, and a touch panel. Buy Arduino Micro SD Card Module TF Card Reader Card Reader SPI Interfaces with Level Converter Chip: Replacement Parts - Amazon. Deals on Apple electronics used to be scarce and hard to find. We will show how this is actually hardwared together. I'm working in a project where I connect an arduino DUE with a Adafruit CC3000 wifi shield running a server to a web interface, there is a file I need to read from the SD card and send trough WIFI, if I dont start the server in the Arduino the SD card reads fine, as soon as the server starts listening for clients the SD card stops working, both devices share the SPI but i rechecked and there. In many cases. If you want to whip up a cocktail, you can measure out the components by hand, or you could use a robotic assistant like this setup by creator Sven Tantau. Your SD card reader is faulty. I want to make a project including SD data-logger, but I had a problem. The following sketch configures Arduino/Arduino clone as serial link between PC and the GPRS Shield(Jumpers on SWserial side). The seventh way is to check the video memory of the video card on windows 10 and windows 7Most problems with computer or laptop instability are caused by malfunctions called. Next I moved the swap partition to the end of the SD card: Launch gparted from within the GUI (under the Preferences menu), select the swap partition, Partition -> Resize/Move. We will going to transfer a data from standard SD card to our PC vise-versa. USB C HUB,Upgraded TOTU 12 in 1 Type C Hub Dongle Adapter (4K Dual HDMI&DP,2 USB3. 6 Audio I2S uses 64 bit frame, improve compatibility with I2S mics. This is the information that you can read from the card, including the card UID that is highlighted in yellow. Users can directly use the Arduino IDE comes with an SD card to complete the library card initialization and read-write. Module features are as follows: 1. RFID basics and RFID Module Interfacing with Arduino In this article, you are going to learn about RFID Arduino interfacing using MFRC522 RFID Reader with the help of two examples. I have a similar problem with SD card working with a previous IDE version but not with the 1. This command lists all of the hard drives, CDs, DVDs, floppies, SD cards, etc that Ubuntu knows about. Audio Player Using Arduino With Micro SD Card: Please SUBSCRIBE my channel for more projects Many of People want to interface the SD card with arduino or want some audio output via arduino. It has more functions than the popular USB Power Meter. I had some success writing text to my SD card, BUT I was not able to write numbers. In this case, the Customer Care team will remove your account from auto-renewal to ensure you are not charged for an additional year and you can continue to use the subscription until the end of your subscription term. This module allows reading and writing of data to a standard SD card and is useful for applications such as data loggers where a large amount of data needs to be stored. Some helpful pages: forum. The shield could read one, but not the other. CompactFlash tests the latest high-speed UDMA 7 compatible cards. I thought I understood the problem but kept getting compile errors. Note this number. The library supports the FAT16 and FAT32 filesystems, but use FAT16 when possible. The process to format is fairly straightforward. I have these lines at appropriate places, which pass the Arduino test: Code: #define [SOLVED] Arduino data. RAMPS interfaces an Arduino Mega with the powerful Arduino MEGA platform and has plenty room for expansion. In this tutorial, I will show you how to read and write to a SD card using an AVR microcontroller. Audio files are read off of an SD/MMC card, which are available at nearly any store. With the system I was able to: Create. PLEASE NOTE: This shield is not 100% Arduino MEGA compatible at this time, however - Here is a sketch that allows use on a MEGA without modifications. The SD card module is specially useful for projects that require data logging. When reading from and writing to this memory, you specify an address which in the Arduino world is equivalent to an array index. You may have never used Raspberry Pi or Arduino, but chances are you’ve heard of them. For less than $50 you get a device that records footage in 1080p. 1 day ago · Red Dead Redemption 2 is live now on PC in all regions. SD chip select is the key hardware option. The cards can be seen when they are in my phone or in the game device etc, but not in the usb adapters or the usb card reader when connected to the pc. We negotiate with retailers on your behalf to save you money. The first part of the OScope project is to implement the Arduino sketch to read the input values from an analog pin. Further, the listing shows only dates from 2013 and I have pictures as late as today. I'm elated to learn that the camera isn't broken! I'll just stick to using a 1 gb card in that camera and the 2 gb in my other camera. The SD card shield adds storage to your Arduino project. (the old) MMC/SD Card and FAT Tutorial. To confirm that this part fits your vehicle, please enter your vehicle's details below. It delivers transfer speeds of up to 312MB/s for SD and microSD and up to 160MB/s for CompactFlash cards, 1 and it features a USB 3. The most frequent question open hardware guru and author of Raspberry Pi Hacks, Ruth Suehle, gets asked is: Should I get an Arduino or a Raspberry Pi? In her latest article, she answers that question by telling us more about the differences between the two boards, and their similiarities, plus what projects one is better for than the other. So: be warned. You cannot receive a refund if you have placed a ShippingPass-eligible order. For less than $50 you get a device that records footage in 1080p. Each of the boards is a full Arduino board programmable using the Arduino IDE. They have them on AliExpress here. Safely Remove must not be used - use "Eject" instead. In fact, it is considered best practice to format your SD card now and then to boost. Image: arduino. But I also know many people have problems with the SD reading. The Arduino Pro Mini is SparkFun's minimal design approach to Arduino. The other half of the data logger shield is the SD card. You may have never used Raspberry Pi or Arduino, but chances are you’ve heard of them. Adding a sensor to the Cave Pearl Logger which changes the SPI bus to one of the other three operating modes would prevent data from being saved until the bus was reset to Mode0. Now let’s see how to print the key presses on an LCD. 0000N Long: 12100. The Arduino Robot is the first official Arduino on wheels. Connect the 4-wire SPI cable to pins D10-D13 of the Arduino so that the grey wire is connected to D10 and the brown wire is on pin D13. Low price along with free shipping on the Sabrent Mini USB 3. but I’m having hard time on finding a good example. If the lock switch is. 31 thoughts on “ HTML Text Box to Send Text to Arduino Web Server ”. 3V I do not have a voltage level converter and have wired the SD card directly up to the SPI port with SS pin tied to the SD card CS. You could understand it just by reading the SD card spec sheet. The square end of the USB. 3 Storing and Retrieving Numeric Values in Program Memory Problem. Then, to install the development kit on your MacOS, Windows, Linux or Raspberry Pi, follow this previous tutorial. Firstly, circuit was set up as in picture: I am using 8 Gb micro SDHC card with SD adapter. But it seems almost impossible to get the card going. I know it doesn’t make sense at first glance. If you then look at the results the Arduino gets back form the main page and there are not 1’s in the HTML the Arduino received then there is an issue with the Arduino Code. SOLUTION 2 - Toggle the lock switch. A sd card and nrf is connected to the slave arduino,i want to read the data in sd card and transfer it to the master arduino through NRF24L01, I will send a command with master arduino and the slave should then send the data accordingly. however, if I use timer0, i think it was pin 11 and 3 will be affected in the same way. It doesn't affect pin 3 and 5. SIM800 SIM_TXD ↔ Arduino D8 (read through for the reason) SIM800 SIM_RXD ↔ Arduino D7 (read through for the reason) Connect module with Arduino as mentioned above or with any changes depending on the module being used. Sometimes, it is not the problem of the system or SD card. It's low cost, available as an easy-to-make kit. This is quite reasonable, but we might save a couple of bucks if we make our own. Arduino is an open source electronic prototyping platform that allows to create robots and interactive electronic objects. We negotiate with retailers on your behalf to save you money. An SD card inserted into the phone underneath the battery compartment becomes locked "to the phone with an automatically generated key" so that "the SD card cannot be read by another phone, device, or PC".