Measure voltage, current and power with Circuit Python on RPi Pico

code.py

from board import *
from busio import I2C
import struct
import time

i2c = I2C(GP21, GP20)
i2c.try_lock()

vm_address = 0x49
cm_address = 0x48

# Configure current meter
i2c.writeto(cm_address, bytes([1, 0x8e, 0xe3])) # Start Conversion, Mux(0), PGA(0.256), Mode(Cont), DR(860), No Comp

# Configure voltage meter
i2c.writeto(vm_address, bytes([1, 0x88, 0xe3])) # Start Conversion, Mux(0), PGA(0.512), Mode(Cont), DR(860), No Comp

buffer = bytearray(4)
while True:
    sampling_rate = 860
    sum_voltage = 0
    sum_current = 0
    sum_power = 0
    for i in range(sampling_rate):
        voltage = None
        current = None
        while voltage is None or current is None:
            if voltage is None:
                i2c.writeto_then_readfrom(vm_address, bytes([0]), buffer)
                if (buffer[2] & 0x80) == 0x80:
                    voltage = struct.unpack(">hh", buffer)[0] * -32 / 32768.0
            if current is None:
                i2c.writeto_then_readfrom(cm_address, bytes([0]), buffer)
                if (buffer[2] & 0x80) == 0x80:
                    current = struct.unpack(">hh", buffer)[0] * -0.512 / 32768.0 / 0.05
        sum_voltage += voltage
        sum_current += current
        sum_power += voltage * current
            
    print(sum_voltage/sampling_rate, sum_current/sampling_rate, sum_power/sampling_rate)