Questions tagged [i2c]
I²C stands for Inter-Integrated circuit, and is a data transferation system that allows connections between computers or microcontrollers and low-level peripherals (e.g. sensors or EEPROMS). It is a multi-master, multi-slave, single-ended, serial computer bus.
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BME280 sensor: OSError [Errno 5]
I recently bought a Raspberry Pi 4B along with a BME280 T/P/humidity sensor. I use the bme280 and smbus2 Python libraries to interface with the sensor. For a while it worked pretty well, but yesterday ...
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Raspberry Pi 4 8GB not booting Rasbian (green led blinking 3 long, 3 short; 3lL/3S - "I2C error - Pi 4")
For starters, this is the exact product I purchased. I'm not from the US and I have little access to RPis, so I bought it during my vacation (around Dez 20).
It's a RPi model 4B, 8GB and what seemed a ...
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Raspberry Pi 4 - hwclock DS3231 RTC delay at boot
Running a Raspberry Pi 4 with a DS3231 RTC setup.
Everything is setup correctly and working fine and the hwclock is synced correctly.
The unit is running without any internet connection.
The problem ...
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Can raspberry Pi support TWI communication?
I have an image sensor MT9V034-D, which is manufactured by onsemi. It is supposed to be controlled by TWI with a SCLK and SDA input, I want to use Raspberry Pi to control it.
I know that Raspberry Pi ...
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Why is my measured I2C clock frequency significantly slower than its setting?
I am setting the I2C frequency on the Compute Module 4 (running Ubuntu 22.04.2 LTS) with dtparam=i2c_arm=on,i2c_arm_baudrate=400000. The I2C bus has two parallel 10kOhm pullup (to 3.3V) resistors per ...
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Multiprocessing to speed up data acquisition for I2C devices
Here's my situation: I have four FDC1004 devices that I want to have connected to an array of 64 electrodes through four ADG1206 16:1 multiplexers. Each device is slaved to a pi4 using separate I2C ...
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I2C Device is not detected
Another issue arises since my last question which I have not solved yet. I am trying to use SGP40 sensor on Raspi4
the sensor has built-in pull up 10k resistors in both SCL and SDA, the sensor VLogic ...
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did I fry Raspi I2C pins?
So I wanted to test a sensor I have on the pi, the sensor has on-board level switchers supports both 5V and 3.3V with a 10k pull-up resistor for both SCL/SDA, Mistakenly I wired the Vin into the 5V ...
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Using 2 SDA and SLC for 2 different sensors
So,
Currently I am using a RTC with my Pi. It takes up the SDA and SCL pins which are GPIO2 and GPIO3.
I now wish to add a Lux sensor. I am using the BH1750 Light Sensor. It too needs to use the SDA ...
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ValueError: No I2C device at address: 0x29 (and others) with TSL2591 on raspberry pi zero W with pijuicezero
I am trying to get the TSL2591 outputting values on a raspberry pi zero W with extended pins and a pijuice zero over it. The following code
import board
import adafruit_tsl2591
import time
i2c = ...
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MCP23017 not seen in the i2c bus
I have a pin multiplexer with a premade board: https://core-electronics.com.au/mcp23017-io-expansion-board-expands-16-i-o-pins.html
My Pi 4 is powered by USB C. The multiplexer is powered with its ...
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Raspberry pi power up button and i2c devices
I have a ads1115 connected to my i2c pins of the raspberry pi. The i2c pins are pin 2 (i2c-SDA) and pin 3 (i2c-scl).
Additionally i want to power up and shutdown my pi with the WAKE_ON_GPIO. Example. ...
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i2c LCD Backlight
I have an LCD display that has a backlight (since when I plug it in it lights up). However, using the code below I cant get it to turn on. Any help would be greatly appreciated
import smbus
import ...
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Python code cannot detect my i2c address
I would like to ask some opinions regarding i2c communications with pca9685. My i2c1(SDA=GPIO2, SCL=GPIO3) of my rpi 4b is used by my mpu6050, which I had to enable one more i2c channel of my ...
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PCA 9685 i2c communication issue
I would like to ask a question regarding the usage of secondary channel of i2c in rpi 4b.
I have enabled the secondary channel through adding "dtoverlay=i2c-gpio,bus=2,i2c_gpio_sda=22,...
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i2c Real Time Clock IC on Raspberry
I am using an industrial device based on a Compute Module Raspberry Pi 3 called Kunbus RevPi Core 3+.
The device is shipped with Raspbian and a pre compiled Image but I would like to install an ...
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I2C Ievel shifter with no device overloads IDs
Im having a problem with my current project.
I am using a 128x32 oled for stats and an RTC.
I also have a logic level shifter with a plug attached for optinal extention(like lcd, etc) running on 5V.
...
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Struggling with I2C devices
I had 2 devices connected using I2C on my Rasp pi 3b.
A clock RTC8563 and a humidity sensor AHT20. Both were working.
I mucked about with the wiring, and did something wrong, as I smelled smoke before ...
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Multiple Sensors connected using I2C with different addresses software approach
I'm using a Rapberry Pi 4 Model B with 4 same I2C sensors. I want to get real-time data from them, but my knowledge of I2C is limited. I know that I can connect them, using different buses, but same ...
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Using TCA9548A for multiple MQ-X gas sensors
I have about 8-9 gas sensors I want to use on my Pi but I'm trying to understand how to use The TCA9548A. The TCA9548A Has 8 pairs of SDL and SCL pins to handle multiple I2C devices, but the output ...
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Hyperpixel 4.0 DPI-Settings on 30/45fps?
I want to use my Hyperpixel 4.0 on 30/45fps because I'm having some issues with other USB-Signals in combination with the pixelclock speed. I noticed that these issues don't occur if I set the ...
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How to run Hyperpixel 4.0 on I2C-0 (GPIO's 44&45)?
I use a Hyperpixel 4.0 touchscreen in combination with my custom ComputeModule4 board. I've seen on the CM4 that there is one more I2C-Bus on GPIO's 44&45 which could be used. Is there any ...
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I2C 1 light at a time`
i am currently using the NCP5623 (I2C LED Driver) to light up my 5V 1A (as written on the box) RGB LED strip.
i followed the sample connection as shown on the datasheet of the NCP5623 and when i ran ...
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i2cdetect shows addresses starting from 8
I have currently installed the latest raspbian as of posting this question.
I have an i2c device with address 0x03 which works when running my program I successfully communicate with it, but when I ...
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16x2 LCD text not showing up on Pico W
I have been using an online tutorial, https://www.youtube.com/watch?v=B8Kr_3xHjqE&t=166s, to display text on a LCD. The LCD can do all the functions except the displaying of text. I know there is ...
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Raspberry PI 4 B 8Gb running 2 ov9281 cameras with camarray hat: ERROR: *** no cameras available ***
I have a Raspberry PI 4 B 8Gb.
I have this kit (2 ov9281 cameras with camarray hat): https://www.uctronics.com/arducam-1mp-2-stereoscopic-camera-bundle-kit-for-raspberry-pi-nvidia-jetson-nano-xavier-...
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how to use a multiple rc522 (RFID) sensors with i2c on a PICO with a Adafruit PCF8575 board
I've been looking through the web for the case of multiple rc522 (RFID sensors) attached to a PICO/W using I2C. Most of the examples and Micropython library code seem to be using SPI. Can someone ...
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i2c_arm bus initialization and device-tree overlay
I've built a Pi1541 HAT, just for fun, and am now playing with the device-tree autoconfiguration in Raspbian. I've made an overlay that autoloads during boot, based on the EEPROM contents, and that ...
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Changing I2C pins through /boot/config.txt failed
I'm trying to get the libcamera-still to work on a compute module 4 with an imx219 but I'm getting a
ERROR: *** no cameras available ***
Running dmesg returns
[ 6.060283] pinctrl-bcm2835 fe200000....
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i2C Using IO Pi Plus Only receiving half of the interupts
Morning,
I'm a newb to this, so suspect i'm just doing something silly, or don't quite understand what i have written. Either way... here we go.
I have a Pi with an IO Pi Plus board attached (https://...
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I2C OS error when activating motors
I'm building an autonomous robot controlled by a Raspberry Pi 3 and I'm having a problem reading the sensor.
I'm using an H Bridge board to activate the motors and an I2C gyroscope sensor (MPU6050) ...
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Problems with I2C communication
Hi I am attempting to test I2C comms between an pi model 4B and teensy 4.1 (running code uploaded from the arduino IDE via usb). While I can read from the slave with a python script if the arduino ...
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Pi camera gets stuck when using Raspistill
My setup is using a Pi compute module 4 to readout an IMX219 Pi camera. In between those two is an FPGA through which all signals are routed (I2C and MIPI).
I got the I2C module in the FPGA working, i....
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Rasperry Pi 4 - Python i2c Device Not Found
I'm having a hard time setting up a i2c device on a pi4.
I did i2cdetect -y 1
But when I run the python code
import board
import busio
import adafruit_ads1x15.ads1115 as ADS
i2c = busio.I2C(board....
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pigpio I2C error
I would like to write 16 bits of data to an I2C bus. Considering that the data to be transferred is not in a list, I am using the pi.i2c_write_device() function, however I get the following error:
...
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Raspberry Pi and bscXfer/bsc_xfer not reliably passing data between Arduino Master
Data passed between a Raspberry Pi, configured as an I2C slave device, is not reliably transmitting between an Arduino I2C bus master device. Data is consistently getting lost, and slave responses are ...
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Raspberry Pico SDK - I2C Write to one Register Address (to set mode) then Read data from 2nd Register Address
I'm a bit confused by i2c_write_blocking() and how to specify the device_address, register_address and data to prime a device for reading and then to read data from another 2nd_register_address in the ...
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Raspberry Pi / I2C Slave / bsc_xfer()
Good evening. I am trying to use a Raspberry Pi Zero W 2 as an I2C Slave. Trying to implement some of the solutions using bsc_xfer in this forum, I simply cannot get any data back and forth to the ...
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Can I replace SCL and SDA into any other pins ? If possible How I write code?
I want to use other pins which are not default SCL,SDA unlike code that Adfruit they wrote. How can I use pin 5,6 or others that active as pin scl sda ?
https://github.com/adafruit/...
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How can I debug why the Pi will only recognize some of the GPIO expanders over i2c?
I am using 8 MCP23008 GPIO expanders to connect 64 total switches to a Raspberry Pi Zero W. Here is my circuit diagram:
I also designed and purchased a custom PCB for the sensors/gpio expanders
Here ...
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BME280 sensor on I2C 0 stopped working after adding another one on I2C 1
I have two similar BMP280 sensors. First, I connected one of them to GPIO 16, 17 (SDA, SCL) as well as 3V3 and GND. I ran the following script in MicroPython to read temperature and other measurements:...
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Program to test i2c communication with serial prints breaks RP pico
Background:
I am trying to test the communication of 2 raspberry pi pico using i2c. Firstly, i sent a string from one and receive it from the second one. Both of them print the results in the serial ...
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PN532 with Raspberry Pi Pico
I have PN532 NFC Module that looks like this
I am trying to connect this NFC Module with Pico, but I have no luck in finding library that allows me this. What can I do to control it? Can you ...
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i2c clock speed is varying depending on used resource
I am having problems with my i2c bus speed on a Raspberry Pi 4. My Sensor requires clock stretching, which I set according to [these instructions (https://pypi.org/project/scd30/)
When I check the bus ...
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PI4 Won't boot green led flashes 3 long 3 short I2C error
Everything was fine with my pi4 until yesterday that didn't boot. I checked the led lights and gives me 3 long and 3 short flashes. I checked in the docs https://www.raspberrypi.com/documentation/...
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Raspberry pi does not detect compass sensor
I have a GY-91 sensor connected to raspberry pi 4B+ and only mpu6050(accelerometer, gyroscope) address 0x68 is getting detected while the compass sensor address 0x0C is not.
$ i2cdetect -y 1
0 1 ...
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PCA9685GpioExample for pi4j 2
I want to use THIS sample in my project.
But its library is for pi4j version 1 and I use the pi4j version 2.
I searched and I didn't find any sample for PCA9685 with pi4j2.
Is there anyone who can ...
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I2c detect first time after reboot throw I/O error
I am using a Compute Module 4 running Raspbian Bulleye (32 bit version).
I configured I2C-4 using these lines in /boot/config.txt :
dtparam=i2c_arm=on
dtoverlay=i2c-gpio,bus=4,i2c_gpio_sda=6,...
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Interrupt Exception in thread Thread-1: and I2C read failed using pigpio
im writing a sensor program with python 3 that has a GUI and if the accelerometer detects motions it goes into an interrupt routine and saves and plots the data for a specific timeframe.
Now onto the ...
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ServoMotor I2C module
I want to control a ServoMotor with THIS module:
I asked a question before in THIS topic.
And as you can see in the topic, they guided me perfectly.
And they said I should use THIS code.
But I have a ...