#!/usr/bin/env python

"""
================================================
AB Electronics UK ADC Pi 8-Channel ADC demo for MicroPython Library

Run using Thonny Python IDE from https://thonny.org/

Create a file in Thonny called ADCPi.py, copy contents from ADCPi.py 
to the file and save it onto the Raspberry Pi Pico

Create a file named demo_readvoltage.py, copy the code from this file and save
onto the Raspberry Pi Pico

Run with "Run Current Command" or F5 in Thonny

================================================

Initialise the ADC device using the default addresses and sample rate,
change this value if you have changed the address selection jumpers

For the Radxa X2l computer use pins 28 for sda and 29 for scl

The sample rate can be 12, 14, 16 or 18

"""
import time
import json
from ADCPi import ADCPi

def main():
    '''
    Main program function
    '''
    # I2C addresses of 0x68 and 0x69, bit rate 12 with SDA on pin 28 and SCL on pin 29
    adc = ADCPi(0x68, 0x69, 12,28,29)

    while True:
        try:
            # get ADC values
            a1 = adc.read_voltage(1)
            a2 = adc.read_voltage(2)
            a3 = adc.read_voltage(3)
            a4 = adc.read_voltage(4)
            a5 = adc.read_voltage(5)
            a6 = adc.read_voltage(6)
            a7 = adc.read_voltage(7)
            a8 = adc.read_voltage(8)
            
            # create an array using the adc values
            data = [a1, a2, a3, a4, a5, a6, a7, a8]
            
            # Create the JSON object with the data array
            output_dict = {
                "board": "adcpi",
                "data": data
            }
            
            # Convert to JSON string
            json_string = json.dumps(output_dict)
            
            print(json_string)
            
            # wait 0.1 seconds between reads
            time.sleep(0.1)
        
        except:
            # show error message if the read fails
            output_dict = {
                "board": "adcpi",
                "error": "read error"
            }
            
            # Convert to JSON string
            json_string = json.dumps(output_dict)
            
            print(json_string)


if __name__ == "__main__":
    main()