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Serial Peripheral Interface. Allows full-duplex serial communication from a master device to one or more slave devices arranged on a bus. Sometimes referred to as a 4-wire bus.

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I am switching a code from Arduino Uno R3 to Arduino Uno R4 Wifi due to the limitation of RAM spaces on R3. I use a thermocouple shield and SD Card read/write shield with the project, which requires ...
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I have a Micro RP2040 board from SB Components. Link to this product With this I also have a 2.4 inch SPI TFT LCD screen with an ST7789 controller Link to the screen, it's on that page just scroll ...
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Hi, I am using p10 Led display and trying to make digital clock. it works fine but after 2 or more weeks later without any switch off there is a overlaying start on characters. why this happening I ...
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Problem Description: I’m trying to interface a Waveshare 1.69-inch LCD module (ST7789V2 driver, 240x280 resolution) with an Arduino UNO board. I’ve connected all the necessary ports as per the ...
Skymero's user avatar
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I have been trying to learn more about using the ATSAMD21 MCU with Arduino. I designed and assembled a bare bones breakout board and have successfully flashed the MKR Zero bootloader and uploaded ...
SolveEtCoagula07's user avatar
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I'm working on a program to interface with a development board I spun for an L9780 - wideband oxygen controller IC. At this point, I'm trying to get a consistent "status" read back but ...
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As the title suggests, I have an Arduino Nano connected to a multiplex (which is connected to 3x 0.91 OLEDs) and an 1.51 inch OLED connected through an SPI. The problem is that they just refuse to ...
anton koluh's user avatar
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After a lot of research and minimum results about pin mapping and particular specific configurations for SPI and I2S on ESP-C3, i about to give up on this. I have recently bought ESP32-C3 Supermini ...
eduardogarcia234's user avatar
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I am using STM32 and 3.5 inch TFT display (Waveshare ILI9486) and I want to display an image and I have connected the SD card. How to do using the Arduino IDE? For now I am trying to fetch a word from ...
Sharan k's user avatar
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I am trying to get data from an ADXL345 accelerometer using an ESP32 via SPI communication. I have configured my code following the ADXL345_WE library specifications and have verified the hardware ...
Revolucion for Monica's user avatar
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I am currently working with a AD7730 chip for analog-digital conversion. The chip is programmable, and I have been pulling code from GitHub as well as other links. I am unfamiliar with SPI (the ...
Alex Vaughan's user avatar
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THIS IS NOT A DUPLICATE QUESTION. My main problem is that whenever I attach the third RC522, the whole system becomes unstable. When I attach the fourth, suddenly one or two of the modules stop ...
Arman Asgharpoor's user avatar
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I have two ESP32 cards. I want to set one of these cards as Master and the other as Slave and communicate via SPI. I have done this before on Arduino Uno, but I cannot do this on ESP32. Below are my ...
Enes Orhan's user avatar
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I am trying to use an esp32 (NodeMCU-32s) as a ringlight controller for my camera. All it should do is sense when an input pin goes low (the camera's output connects to ground when the shutter goes ...
Zach's user avatar
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Hello fellow arduino users! I have a question regarding using the Sparkfun Canbus shield in conjunction with the LSM6DS33 sensor on a dual SPI configuration. I have managed to get theese two to ...
Paul Boutsiadis's user avatar
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I have a computer talking serially to an UNO SPI Master and, beyond it, multiple MEGA Slaves. The slaves never talk back to the master. I understand it is normal and correct to assert SS LOW to ...
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I have an ESP32 TTGO T-Call and I want to add a LoRa SX1276. I am new to that and I am trying to write a simple program that, when it receives a packet from a LoRa sender, sends via gsm an HTTP ...
kostas ch.'s user avatar
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I have a project where I need to store data (~16 Mo) on a memory and be able to fetch the data fast (<36000 bits/s) with DMA because I have other signals to take care of. Currently I use an SD card ...
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I'm having issues connecting to my arduino mega via ethernet. Its a very basic start to the code just to get the network side up and running, them im going to add in what I actually want it to do. For ...
Isaac M's user avatar
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Beginner with the Pi Pico here, but I studied electronics engineering and am reasonably hardware literate. I've used mbed online for a project prior to covid. I want to use SPI to connect to a display ...
K Langley's user avatar
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I'm currently working on a project using an ESP32 (the Waveshare ESP32 Driver Board), and I am trying to read data from an SD card, but consistently getting a "SD Card Mount Failed" error. I ...
Mike Buss's user avatar
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To collect temperature and BPM, I connected a max30101 in my Heltec WiFi kit V3 with ESP32. The data collected are stored in arrays to extract statistical features from signals which an algorithm will ...
Alice's user avatar
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I wish to create a rudimentary ethernet in/out - switch/hub where I can (sort of) daisy chain my boards. (I don't wish to use a ethernet switch/router/hub) One port would be acting as server The ...
Ohbhatt's user avatar
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I'm having an issue where anytime I run a program such as the SD card read write example (Below) the COM port disconnects. The only changes I have made to the example code is I am using SPI1 instead ...
Rian Noble's user avatar
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I have created a circuit with a barebones ATMega328. I also have an external programmer (Sparkfun's Pocket AVR Programmer)... Now I want to program a particular sketch... When uploading a sketch, do i ...
user1584421's user avatar
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I have an esp32 connected to an FPGA about 2 cm on a PCB. I am trying to send a constant data stream to the FPGA at a throughput of around 1.5 MB/s. This is too fast for UART, I've been considering ...
Orbitronics's user avatar
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My end goal is to read information from an nRF24l01 module connected to my Arduino UNO R3, and generate an interrupt whenever a message is sent to the Arduino. Now, I have read that for Hardware ...
insipidintegrator's user avatar
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I am looking at the documentation for the Arduino Zero, and I am a little confused. It indicates that pins 13, 12, and 11 can be used for CIPO, COPI and SCK, but using SPI.begin() puts the signals on ...
eramirez2024's user avatar
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I am currently using an evalkit Nina W106-00B board that incorporates an ESP32. I am desperately trying to implement OTA (Over-The-Air) updates. I started by modifying my partitions.csv file, which ...
Zapsalis's user avatar
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I am using MAX7219 8 digit 7 segment displays with Arduino Mega2560. Now, I have to physically space out the displays far from each other. Hence, after a certain distance the displays on the far end ...
Soumarya's user avatar
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I'm pretty new to esp32 and I'm trying to combine two codes in one, they are simple codes from projects that I found online, the first one uses PIR sensor to send message to telegram each time motion ...
w22tq's user avatar
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Has anyone successfully use SPI1 of those pins? SCLK -> PB3 SDIO -> PB5 SDO -> PB4 MISO CS -> PA15 I've tried to use another side of SPI1 pins on the other sides of the board (PA4, 5, ...
Settasak's user avatar
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I have troubles connecting a nRF24L01 transceiver to a Wemos D1 R2 board. I succeeded on an Arduino Uno. Does anyone know the pinout? I used (same as with Uno): D13 - SCK D12 - MI D11 - MO D8 and D9 ...
FredV's user avatar
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2 answers
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I need to send data as fast as possible from an Arduino DUE to an extern DAC. To do so I use DMA & SPI and I want DMA to fetch data from the memory and send it to the SPI which will just relay it ...
Vlad's user avatar
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I'm working on a project where i have a Raspberry pi Pico connected to a NRF24l01+ to send some data. However i'm not recieving any data on the reciever and i think that its because the SPI bus is not ...
Earthbound Ruben's user avatar
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I am making a function for one of my devices, my device needs a particular SPI setting. I was hoping to save the current setting of the SPI class into some variable, load in the required setting, do a ...
DrakeJest's user avatar
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I have connected this Adafruit SD Breakout to a Teensy 3.2 over SPI. Because Teensy 3.2 is 3.3 V, I've connected the 3.3 V pin of the Teensy to the 3V pin of the SD breakout. See sketch below. I'm ...
daniel's user avatar
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I tried the following code to communicate via SPI with MPU9250 and Mega2560 But I got the following error: Error initializing communication with IMU Why I got this error? /* * Brian R Taylor * brian....
m-m's user avatar
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I am working on a project and I need an AD7768-1 library to make this analog-digital-converter talk to my Arduino using SPI. " The AD7768-1" doesn't exist in Arduino's library. Thanks in ...
Jaafar AIT M'BAREK's user avatar
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I am a newb at coding. Does anyone have any code laying around or some time to write some to send data over UART SERCOM on pins 11/12/13 on a SAMD21 board like the Arduino M0? I am trying to send a ...
Charlie Nicholson's user avatar
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I'm new to the field: I'm trying to drive a TFT ST7735S display (this is the model I'm currently using: https://www.amazon.it/dp/B078JBBPXK/ref=pe_24968671_487022601_TE_SCE_dp_1) with an Arduino Mega ...
Luke__'s user avatar
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I am currently working on an SPI interface to measure the voltage of an amplified sensor bridge signal. I am using an ESP32 module to control the device. Since I am logging the data to an SD card, I ...
Dexter S's user avatar
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Currently I am using avrdude and I'm programming my atmega328p chip via the spi pins by pulling the RESET pin low (spidev programmer). In my project I'm using predominantly i2c and this the only place ...
php_nub_qq's user avatar
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I want to make a project with a (Nokia 5110) display using u8g2 library. Here I have the code for my program: #include <Arduino.h> #include <U8g2lib.h> #include <TM1637Display.h> #...
kshysztof's user avatar
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I have run into this issue where my code will upload to my Due but fails to execute. I have verified the code works on a SparkFun Redboard. The only code difference is that the SPI pin assignments ...
Ender's user avatar
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I needed SPI with CPOL=1 and CPHA=1. I read, that I could achieve this via SPI_MODE3. Further, I read to put the CS low and CS high code after SPI.beginTransaction(...) and before SPI.endTransaction() ...
leonhardp's user avatar
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I took a look at a barebones Arduino schematic. It had three different ways of programming the chip. The first interface is for programming through SPI (For example with "Pocket AVR Programmer&...
user1584421's user avatar
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I'm currently working on connecting a Funduino version of usb host shield onto an arduino mega board. But the serial output shows "osc did not start", which means the board can't find the ...
Redsam121's user avatar
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I need to write and read the measurements received by a sensor on an SD card. The card reading would be to display the data on a TFT screen. Specifically, I am using the 1.8-inch ST7735 screen. To use ...
Libegria's user avatar
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4 votes
3 answers
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I want two Arduino Nanos to communicate with each other using SPI, ideally at around 2MHz or faster. I have two standard Nanos running at 16MHz on 5V. The master uses SPI.transfer() to send an array ...
Infinity Computers's user avatar
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