I2C - Send and Receive Data
Materials
- AmebaD [ AMB23 / AMB21 / AMB22 / BW16 / BW16-TypeC ] x 1
- Arduino UNO x 1
Example
I2C is a quite common module on microcontrollers, it only takes 2 wire and able to achieve data rate at up to 3.4Mbps. It works in master-slave model and a master can simultaneously connect to up to 128 slaves, making it a very versatile communication protocol between microcontroller and sensor.
Here we are going to use Ameba as an I2C master and Arduino UNO as a slave to achieve I2C send and receive.
For Sending Data
Before connection, make sure to upload the “Examples -> Wire -> Slave_receiver” example code to Arduino UNO.
For Receiving Data
Before connection, make sure to upload the “Examples -> Wire -> Slave_sender” example code to Arduino UNO.
| Unit | sda | scl |
|---|---|---|
|
|
PA_26 |
PA_25 |
| Unit | sda | scl |
|---|---|---|
|
|
PB_0 |
PA_31 |
| Unit | sda | scl |
|---|---|---|
|
|
PA_26 |
PA_25 |
Code
Then copy and paste the following code line by line into REPL to see their effects.
from machine import Pin, I2C i2c = I2C(scl = "PA_25", sda = "PA_26", freq=100000) # configure I2C with pins and freq of 100KHz i2c.writeto(8, bytes([123])) # send 1 byte to slave with address 8 with integer '123' #After uploading Slave_sender example to Arduino UNO, copy this code to the i2c.readfrom(8, 6) # Receive 6 bytes from slave
