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Pololu-Romi-32U4-Carte-Raspberry (voir la source)
Version du 2 novembre 2019 à 12:58
, 2 novembre 2019 à 12:58→Raspberry Pi interface and level shifters
The Romi 32U4 Control Board was designed to be easy to interface with a Raspberry Pi single-board computer to expand the Romi’s processing power. It has a connector and mounting holes matching the Raspberry Pi HAT (Hardware Attached on Top) specification and is designed to connect to the Model B+ and newer versions of the Raspberry Pi with 40-pin GPIO headers (including the Raspberry Pi 3 Model B and Model A+). A 2×20-pin 0.1″ female header is soldered to the control board, and it ships with a set of four standoffs, screws, and nuts.
The Romi 32U4 Control Board was designed to be easy to interface with a Raspberry Pi single-board computer to expand the Romi’s processing power. It has a connector and mounting holes matching the Raspberry Pi HAT (Hardware Attached on Top) specification and is designed to connect to the Model B+ and newer versions of the Raspberry Pi with 40-pin GPIO headers (including the Raspberry Pi 3 Model B and Model A+). A 2×20-pin 0.1″ female header is soldered to the control board, and it ships with a set of four standoffs, screws, and nuts.
[[Fichier:Pololu-Romi-32U4-Carte-Raspberry-00.jpg|800px]]
== Communication I2C ==
When used with a Raspberry Pi, the control board is designed to serve as an auxiliary controller, communicating with the Raspberry Pi using an I²C interface (also known as 2-wire Serial Interface, or TWI). As such, the ATmega32U4 microcontroller’s I²C data and clock lines (SDA and SCL) are connected to the corresponding lines on the Raspberry Pi’s I²C bus 1 through on-board level-shifting circuits. These bidirectional level shifters convert between the AVR’s 5 V logic level and the Raspberry Pi’s 3.3 V logic level.
We have written an [https://github.com/pololu/pololu-rpi-slave-arduino-library Arduino library] for our our 32U4 family of boards that lets them act as an I²C slave and provides a framework for communication between the ATmega32U4 and a Raspberry Pi master.
A [https://www.pololu.com/blog/577 tutorial) (''Pololu, Anglais'') on the Pololu blog demonstrates this library and its included example code, using them to make a robot that can be remotely controlled and monitored through a web server running on the Raspberry Pi. This tutorial uses our A-Star 32U4 Robot Controller SV and a laser cut chassis, but the instructions for setting up your Raspberry Pi and Raspberry Pi slave library for Arduino still apply for the Romi 32U4 Control Board, and we will be releasing an updated tutorial with steps specific to the Romi soon.
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