Questions tagged [i2c]
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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Use class object inside an ISR
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 ...
CommunityBot
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I2C arduino to jetson TimoutError
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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How to make I2C work on RS485?
I'm trying to optimize the communication (minimize wires) on a project where I can control a motor and toggle some 230V devices by using RS485 and I2C.
On this project, I'm using an Arduino (Mega) ...
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Change I2C address of Arduino Modulino Thermo
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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Is there any DS2482 I2C to 1-Wire bridge functional library?
Please let me know if you know any good library for DS2482 I2C to 1-Wire bridge.
I tried to use the DS2482_OneWire library but I got errors when trying to run the library examples (Read_temp_sensors ...
CommunityBot
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Send uint32_t over i2c from attiny85 slave to atmega328p master
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 ...
CommunityBot
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Problems reading WNK811 i2c sensor on arduino using wire library without device library
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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Arduino slave with 2 masters sharing the same I2C Bus?
Consider a scenario where two (or more) master devices (the NodeMCUs, in this case) share an I2C bus with one (or more) slave device(s), like thus:
Would this be a feasible setup? In other words, ...
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How do I read data from a 32 bit I2C register address?
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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Arduino seems to be reading incorrect analog I/O. Am I doing something wrong?
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 ...
CommunityBot
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Circuit Playground Express (CPX) + Crickit + I2C sensors
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 ...
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Initializing both I2C devices of a RP2040 Rpi Pico with Earle Philhower Core
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 ...
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Two Arduino boards with I2C sensors
I have been searching the internet about how to transfer data from multiple sensors from one Arduino to another using I2C, but no luck. All the code and tutorials online focus on multiple slaves with ...
CommunityBot
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INA219 becomes unreachable as soon as A1 is connected
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 ...
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Confused between SPI and I2C for SSD1306 OLED
I recently got myself an SSD1306 OLED display:
I haven't been able to successfully wire it to an Arduino (Mega 2560) however. I have been reading up on I2C and SPI and checked some libraries from ...
