Communicating with I2C module

[byunmlab]

I am controlling an arduino uno with a windows pc to do some data collection. I am trying to connect an ADS1115 module to the I2C bus of the arduino in order to get higher resolution data but I am struggling to do this succesfully. Here is my code:

# %% imports
import numpy as numpy
from pyfirmata import Arduino, util, I2C_REPLY, I2C_REQUEST
import time
import inspect
from tqdm import tqdm

# Fix the deprecated part of the pyfirmata library
if not hasattr(inspect, 'getargspec'):
    inspect.getargspec = inspect.getfullargspec

# %% custom class

class MyBoard(Arduino):
    def __init__(self, port):
        super().__init__(port)
        self.add_cmd_handler(I2C_REPLY, self.handle_i2c)

    def send_i2c(self, data):
        self.send_sysex(I2C_REQUEST, data)

    def handle_i2c(self, *data):
        # TODO: handle i2c data
        print('16-bit ADC module: \t', data)

# %% setup
port = 'COM4'
board = MyBoard(port)

adc_address = 0x48

it = util.Iterator(board)
it.start()

board.analog[0].enable_reporting()

# setup i2c messaging
i2c_data = [
    I2C_REQUEST,
    0x48,
    0x00,
    I2C_REPLY
]


# %% Testing
count=15
loop = tqdm(total=count)

for i in range(count):
    # # TODO: read pot value 
    board.send_i2c(i2c_data)
    print('Arduino Built-in ADC: \t', board.analog[0].read())

    time.sleep(1)
    loop.update(1)

loop.close()

# %% exit
board.exit()

When I run it I get output that looks like this:

Arduino Built-in ADC: 0.3206
16-bit ADC module: (118, 0, 0, 0)
Arduino Built-in ADC: 0.3011
16-bit ADC module: (118, 0, 0, 0)
Arduino Built-in ADC: 0.2825
16-bit ADC module: (118, 0, 0, 0)
Arduino Built-in ADC: 0.2669
16-bit ADC module: (118, 0, 0, 0)
Arduino Built-in ADC: 0.2483
16-bit ADC module: (118, 0, 0, 0)
Arduino Built-in ADC: 0.2326
16-bit ADC module: (118, 0, 0, 0)
Arduino Built-in ADC: 0.2151
16-bit ADC module: (118, 0, 0, 0)
Arduino Built-in ADC: 0.1984
16-bit ADC module: (118, 0, 0, 0)
Arduino Built-in ADC: 0.1896
16-bit ADC module: (118, 0, 0, 0)
Arduino Built-in ADC: 0.1779
16-bit ADC module: (118, 0, 0, 0)
Arduino Built-in ADC: 0.1623
16-bit ADC module: (118, 0, 0, 0)
Arduino Built-in ADC: 0.1496
16-bit ADC module: (118, 0, 0, 0)
Arduino Built-in ADC: 0.1339
16-bit ADC module: (118, 0, 0, 0)
Arduino Built-in ADC: 0.1202
16-bit ADC module: (118, 0, 0, 0)
Arduino Built-in ADC: 0.1036
16-bit ADC module: (118, 0, 0, 0)

As you can see, as I twist the potentiometer that I have connected the value reading with the arduinos ADC is working correctly but from the I2C I am just getting the same tuple everytime, (118, 0, 0, 0). I have looked over issue #37 but I have not been able to solve my problems yet. Thanks for any help