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Questions tagged [i2c]

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Inter-Integrated Circuit (I²C) is a bus for low speed peripherals. Use this tag for questions regarding how to use I²C with an Arduino, or for problems with I²C and your Arduino.

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I am working with I2C for the first time and having an issue with a very simple problem. I want to send 2 bytes from an Arduino and nvidia jetson orin. On the Arduino, my code looks like this: #...
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I want to use several Arduino Modulino Thermo modules in one project and therefore change the default I2C addresses of the sensors. On the internet, I find conflicting info about if this is possible. ...
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I am trying to read a WNK811 pressure sensor connected by i2c to an STM32 Nucleo F401RE, programmed as arduino. The WNK811 is a Chinese device, the device datasheet is highly minimal (inadequate in my ...
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I run into an issue with querying a uint32_t with an atmega328p master from an attiny85 master. I have put both codes below. I did run the equivalent code for just sending a uint8_t and all works ...
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I'm having trouble reading the I2C data from the CPS8200, that has a 32 bit Register Address. Since I'm not too familiar with I2C register addresses more than 8 bits, and right now I'm not sure if I'm ...
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I have a Circuit Playground Express (CPX) mounted on a Crickit. I want to control two air pumps using the motor output on the Crickit, but also connect two Adafruit SCD41 sensors using I2C. When I ...
LuxNo's user avatar
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I'm using the Arduino IDE (v1.8.19) with the Earle Philhower core to program a Raspberry Pi Pico (RP2040) board. I2C bus 0 of the Pico (pins 4 (SDA) and 5 (SCL) are coupled to a first MCP23017 port ...
Malzon's user avatar
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I'm trying to use INA219 DC current sensor with Arduino, using the exact same wiring as the one in Adafruit article, with the exact same Arduino code. It works with the default address 0x40 when A0 ...
Arseni Mourzenko's user avatar
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I’m attempting to connect a 4x20 LCD to an Arduino Mega 2560 Rev3 using the I2C protocol via a 2.5m VGA cable. I understand that such a long cable isn’t ideal for I2C communication, but I cannot ...
Luigi's user avatar
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I am using an ATTiny88 to measure temperature using a 470 ohm thermistor attached to port A3 on the Arduino. The thermistor is attached in series with an 1870 ohm resistor connected to Vcc. At room ...
Leslie Rhorer's user avatar
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I have an ESP32 controller and am using AT24C1024 for communication. In my code, I am trying to access an external EEPROM at positions writing data from 0 to 10000 position data is = '1'. However, ...
Gopal's user avatar
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This is similar to Is it possible to program an AVR chip (atmega328p) via i2c?, but not exactly, and that thread is a little shy on details. I have an ATTiny88 attached via I2C to a Raspberry Pi, with ...
LesRhorer's user avatar
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I need to interface an ATTiny88 MCU configured as an I²C slave with a Raspberry Pi configured as an I²C master. I may be using the wrong approach, but I have a structure consisting of four different ...
LesRhorer's user avatar
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I'm sorry to ask this, as it has been asked many times, but I can't get the Arduino micro board to recognize my LCD screens. I've tried using two different LCD screens and two different Arduino micros....
Bilal Bahadır Akbulut's user avatar
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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 ...
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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 ...
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I am working with 2 Pololu Altimu-10 V6 connected to the same ESP32 board. Both of them are connected via i2c protocol and have different addresses. The addresses are 0x1C and 0x1E. I have this code ...
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Update_2: No change after Update_1, same error. I still have to comment either email, I2C, or Temperature out, that the other two can work. Update_1: I'm also using a DS18B20 with #include <...
Christian's user avatar
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I am trying to use an Adafruit PCA9685 servo driver module with an ELEGOO Mega 2560 board. I am supplying the servo driver board with 5 V and tested all the wires to make sure. I tested the servo ...
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BTW - I have, unsuccessfully, searched for an answer before posting. I have an NodeMCU connected to a bunch of Arduino Nanos over the I2C bus. The WiFi-enabled NodeMCU has the capability to do OTA ...
tk007b's user avatar
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I have a project (still planning) with three I2C sensors: GPS, 3-axis gyro+accelerometer, and OLED. Do I connect SDA/SCL in series, or do I connect them in parallel?
Marifin -'s user avatar
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I am trying to get my DHT20 and OLED (both from the Arduino Sensor Kit) to work at the same time. I am able to get them working separately with their respective test codes, but when I try to combine ...
Darren D'Arcy's user avatar
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I have to simulate an ADC that behaves as an I2C slave. The simulated values that the ADC shall expose are sent over serial, saved on an attribute and are requested by a master device over I2C. A ...
lumaca96's user avatar
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I have an application polling 4 ADCs by I2C. The application shall also write on some ADC registers. In order to test it, I'd like to use a single Arduino UNO, enabling it for receiving I2C messages ...
lumaca96's user avatar
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I want to connect two MPU6050 sensor on Esp32 using the I2C protocol. ESP32 to MPU6050 connection, I'm using - VCC(ESP32) - VCC(MPU6050_1) - VCC(MPU6050_2) GND(ESP32) - GND(MPU6050_1) -...
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#include<avr/io.h> float x, y, z, baf = 0, j, i = 0, k, angle, a, b, c, d; unsigned long current_time = 0; unsigned long previous_time = 0; unsigned long time_interval = 0; float gyro_offset_x = ...
Divy Shah's user avatar
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I am working on a project where I need to get the RGB light value from surrounding ambient light. For that I am using an ESP32 with a Sparkfun ISL29125 breakout board. I have tried to scan available/...
Jackris19's user avatar
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I am building an airplane. As a controller I am using a Raspberry pi 4. There are 3 sensors (MPU6050, QMC5883L, BME280) and arduino pro mini connected to the raspberry via i2c. When sending requests ...
Xrou's user avatar
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I'm using the code below, but I had no success. I'm using this connection wire: The photo of the Arduino doesn't show the SCL and SDA pins, but please consider that it has 2 SCL pins and 2 SDA pins in ...
GUSTAVO TELES's user avatar
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I am working on a project that involves 3 PN532_modules to an ESP32, which sends the Tag_ID over BLE. Plan A was to use One module on i2c_1, second on I2C_2 and third over SPI. The SPI one works as ...
user91535's user avatar
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I am hoping there is a simple fix to this problem. I am playing around with a 16x2 lcd with a I2C connector attached. I wired it up to an elegoo uno R3. I started with some code I've used before and ...
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I have an SMD ATTINY that I'm using for a project. Attached to it are 3 I2C devices. When programming it using an Arduino as an ISP, can I have those devices attached? Ie, do I have to program the ...
djd53's user avatar
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I'm a total beginner, so I've been talking with Chatgpt regarding the capabilities of the Attiny85 microcontroller. But the AI would hallucinate a lot and give only partially right answers (because it ...
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I'm attempting to wire two breakout boards with i2c devices to a Mega2560: a HD44280 LCD with PCF8574 i2c backpack a combo board with DS1307 + AT24C32 There are two obvious possibilities for cabling:...
Bitbang3r's user avatar
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Arduino Pro mini 3.3V stucks few hours after startup. After repowered, it begins to stuck within a few seconds. If I wait long enough before turning it on it stucks little later for example now it ...
CaveScientist's user avatar
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Hey there Stack community. I'm working with the Particle Boron v4.1.0. I'm connecting a Garmin Lidar Lite V4 on I2C. I'm using the LIDARLite_v4LED.h header file found in the library given for this ...
Katie Neeley's user avatar
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SSD1306 OLED display connected to an ESP32-S2 over hardware I2C. I noticed that the text will sometimes get scrambled or lag during a screen update. When left running long enough, the screen will get ...
subcanny's user avatar
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I saw this video from James Bruton. See the links to the GitHub repos in the video description. I bought a few AS5048B boards from AMS, so I can measure the position of my stepper motors. In the ...
John Doe's user avatar
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pretty new to arduino stuff and was hoping to get some help with my code. I'm trying to use 2 ToF sensors and get continuous readings from them. I understand that I have to use the xshut feature and ...
nh1628's user avatar
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I have tested the library and LCD with simple script and everything worked fine. Now I am trying to add the LCD functionality to my working program but the code reaches the lcd.begin(); function it ...
Jesus Soto 's user avatar
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Hey all I have found some code on GitHub that works with my pool pump but it seems my model is a little newer than the one they used on on their GitHub. Most things seem to work but what doesn't is ...
StealthRT's user avatar
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I am trying to use an MPU6050 with my SAMD21-based board (a LightAPRS W-2), but it doesn't work. The sensor definitely works, as I can get data from another 3.3 Vlogic-level board, and the sensor ...
Charlie Nicholson's user avatar
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I am new to LIS3DH and tried to interface it with Arduino Uno. I have made the circuit as follows- LIS3DH : Arduino Uno SCL : SCL (GPIO18) SDA : SDA (GPIO19) 3.3v : 3....
ABD's user avatar
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According to this thread the VL6180X after changing the i2c address the new address should persist after a power down. but when i changed mine it came back to its default address at 0x29. Here is the ...
DrakeJest's user avatar
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I'm creating a telemetry package for my my mom's model rocket with a MPU6050, a BME280, and a SD reader/writer. The code I found for the BME does not read any information. When I upload an I2C scanner,...
ModelRocketeer's user avatar
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I tried i2c EPROM and that worked pretty fine with arduino master. then i wanted to establish i2c communication between 2 arduinos such that both exchange each other's sensors data. I am not able to ...
mohsin ali's user avatar
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I have a problem with lcd, I have NUCLEO64 L746RG , I have Lcd Display and I2C connected to it. When I verify code it gives me and long error and I can not find the solution or cause of this error: ...
kristian311'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 connect two TMP117 boards to one Metro (ie. Arduino). (the first, addressed at 48 the 2nd at 49.) Should 2nd board's 4 wires simply attach (ie. solder) in parallel to 1st board's 4 wires? (...
Doug Null's user avatar
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I'm trying to make a fairly simple program that interfaces with the Adafruit TSL2591 light sensor as well as a MAX30102 pulse oximeter. They both use I2C for communication. I'm using the recommended ...
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