Support for HMC5883L

[davizucon]

Hello, I'm trying to get work HMC5883L base on i2c_adxl345_accelerometer.py, but no luck. I made some tests/changes like:

    my_board.set_pin_mode_i2c()
    # set up power and control register
    my_board.i2c_write(30, [2])
    time.sleep(.1)
    my_board.i2c_write(30, [0])
    time.sleep(.1)

    # set up the data format register
    my_board.i2c_write(30, [3])
    time.sleep(.1)

    read_count = 20
    while True:
        # read 6 bytes from the data register
        my_board.i2c_read(address, 4, 6, the_callback)

using this code as example: Arduino C Code example

If anyone can help

Thanks

[MrYsLab]

I am assuming you have run the code in the link above and it works. I cannot verify this since I do not own the device.

Here is what I believe the script should look like:

import sys
import time
from pymata4 import pymata4

# the call back function to print the 3 data registers
def the_callback(data):
    """
    :param data: [pin_type, Device address, device read register, x data pair, y data pair, z data pair]
    :return:
    """
    print(data)

def hmc(my_board):
    # device address = 30
    my_board.set_pin_mode_i2c()

    # set up mode register
    my_board.i2c_write(30, [2, 0])
    time.sleep(.1)

    # start the continuous reads
    my_board.i2c_read_continuous(30, 3, 6, the_callback)

    # do nothing and wait for the data
    while True:
        try:
            time.sleep(.1)
        except KeyboardInterrupt:
            my_board.shutdown()
            sys.exit(0)

board = pymata4.Pymata4()
try:
    hmc(board)
except KeyboardInterrupt:
    board.shutdown()
    sys.exit(0)

If this works, please close this issue.

[davizucon]

Thank you for converting the code!!! I'll keep it for future devices, but making some research, the device HMC5883L actually is QMC5883L. Related with HMC5883L Compass Module Communicating but all zero's for x,y,z

I'm closing the issue, maybe in future, add support for QMC5883L

Best