write data to a register using wire library

Multiple nodes can be on the bus with 7-bit addressing. The bus can act in master mode where a node generates the clock and initiates communication with slaves or in slave mode where the node receives the clock and responds to the master. System Management Bus (SMBus) is a stricter subset developed by IBM. It was invented in 1982 by Phillips Semiconductor and is a bidirectional bus consisting of two open drain lines, the Serial Data Line (SDA) and Serial Clock Line (SCL) pulled up with resistors. I2C (Inter-integrated Circuit) is pronunciation variously as I-squared-C, I-two-C and IIC. Wikipedia gives a good discussion of I2C which is greatly glossed over in this section. If future experimentation works out another post will be made demonstrating a more sophisticated use of the microcontroller such as motor control, adding additional GPIO, PWM, DAC, ADC, etc.

However, most seem to be written for Python 2.7, have errors, don't demonstrate return of data, etc. There is nothing original about this and there are multiple posts on the internet doing something similar. It will then request the Feather to return the byte and display it on the terminal.

In this post a Python 3.7 script running on a Raspberry Pi 4 will be used to send a single byte to an Adafruit Feather M0+ using the Arduino libraries to control the built-in LED. I have used I2C in the past and have written drivers for ICs but not from the Raspberry Pi. To address this I am experimenting with I2C using a Raspberry Pi as the master and a microcontroller as the slave. A potential problem with that choice however is the lack of peripherals compared to the Beaglebone as well as the real time control possible with the PRUs on the Beaglebone. I am electing to use the Raspberry Pi since I have more experience with it. The two leading candidates for the main processor are the Raspberry Pi 4 and the Beaglebone AI. I have been thinking about building a robot again and would like to be able to use Artificial Intelligence / Image Recognition. There is a follow-up post here that demonstrates multi-byte transfer and control of GPIO, ADC, PWM, and stored data on the microcontroller.

This post demonstrates simple sending and receiving of data from a Raspberry Pi using Python 3.7 to a microcontroller using the Arduino libraries.

Write data to a register using wire library