Contents
How to access the I2C bus on Raspberry Pi?
On Raspberry Pi, the I2C bus can be accessed in a Python script using the SMBus library. SMBus is a subset of the I2C interface. The Python library for SMBus can be used to communicate with I2C based devices. The SMBus library can be installed on Raspberry Pi by running the following command:
Which is GPIO for Raspberry I2C slave?
But after read some related questions about pigpio, for the Raspberry I2C i use GPIO18 and GPIO19 (but without any resistors) and it’s work. I receive always only 16 bytes (“Hello from ESP82” with sometimes another line with “66”) of the datas “Hello from ESP8266” when it will work well but also some datas garbages.
How to talk to an I2C device in Python?
In order to enable the Python to talk to the I2C device you have to install the module called SMBus (System Management Bus). This module enables the user to write the code in python for communicating with the I2C device. Follow the following simple steps to be able to communicate to the I2C device.
Can a Raspberry Pi connect to a slave device?
In our case the master device is definitely Raspberry Pi and a number of slave devices can be connected to the single I2C serial communication bus. Hence as described in the previous post it is important that you know the address of each slave device. It is not difficult as it also needs the execution of the single command in the terminal window.
What can I add to Raspberry Pi for I2C and SPI?
There are many peripherals that can be added to a microprocessor over the I2C and SPI serial interfaces. These include atmospheric sensors, EEPROMS, and several types of display. The Pi Wedge helps access the I2C and SPI signals.
How many SPI buses does Raspberry Pi have?
Raspberry Pi has two exposed SPI buses. SPI0 has two hardware chip select lines and SPI1 has one hardware chip select line. One SPISerialBus () resource declaration is required for each chip select line for each bus.
How are I2C bus drivers different from SPI and UART?
Unlike UART or SPI, I2C bus drivers are open-drain which prevents bus contention and eliminates the chances for damage to the drivers. Each signal line in I2C contains pull-up resistors to restore the signal to a high of the wire when no device is pulling it low.