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micropython/examples/accel_i2c.py
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# This is an example on how to access accelerometer on | |
# PyBoard directly using I2C bus. As such, it's more | |
# intended to be an I2C example, rather than accelerometer | |
# example. For the latter, using pyb.Accel class is | |
# much easier. | |
from machine import Pin | |
from machine import I2C | |
import time | |
# Accelerometer needs to be powered on first. Even | |
# though signal is called "AVDD", and there's separate | |
# "DVDD", without AVDD, it won't event talk on I2C bus. | |
accel_pwr = Pin("MMA_AVDD") | |
accel_pwr.value(1) | |
i2c = I2C(1, baudrate=100000) | |
addrs = i2c.scan() | |
print("Scanning devices:", [hex(x) for x in addrs]) | |
if 0x4C not in addrs: | |
print("Accelerometer is not detected") | |
ACCEL_ADDR = 0x4C | |
ACCEL_AXIS_X_REG = 0 | |
ACCEL_MODE_REG = 7 | |
# Now activate measurements | |
i2c.mem_write(b"\x01", ACCEL_ADDR, ACCEL_MODE_REG) | |
print("Try to move accelerometer and watch the values") | |
while True: | |
val = i2c.mem_read(1, ACCEL_ADDR, ACCEL_AXIS_X_REG) | |
print(val[0]) | |
time.sleep(1) |