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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.

769 questions
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1 answer
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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: #...
Bobipuegi's user avatar
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1 answer
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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. ...
Phil's user avatar
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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 ...
B M's user avatar
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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 ...
Noel's user avatar
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2 answers
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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 ...
J. Street's user avatar
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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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2 answers
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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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1 answer
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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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1 answer
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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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1 answer
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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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-1 votes
1 answer
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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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3 votes
1 answer
140 views

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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