#import machine
from machine import I2C, Pin
import utime

# Define MCP4725 constants
MCP4725_I2C_ADDR = 0x60
DAC_REGISTER = 0x40

# Raspberry Pi Pico constants
SDA_PIN = 8  #physical pin 11
SCL_PIN = 9  #physical pin 12

##########################################################################
def scan_i2c():
    i2c = I2C(0, sda=Pin(8), scl=Pin(9), freq=100000)  # Adjust pins and frequency as needed
    devices = i2c.scan()

    if devices:
        print("I2C devices found:")
        for device in devices:
            print(hex(device))
    else:
        print("No I2C devices found.")

scan_i2c()
#########################################################################

# Initialize I2C
i2c = I2C(0, sda=Pin(SDA_PIN), scl=Pin(SCL_PIN), freq=100000)
# Set up I2C
#i2c = machine.I2C(0)  # Use I2C 0
#1i2c.init()

# Function to write a value to the MCP4725 DAC
def write_dac(value):
    # Calculate the DAC data value
    dac_value = int(value * 4095 / 3.3)  # Convert voltage to 12-bit DAC value

    # Construct the data packet
    data = bytearray([(dac_value >> 8) & 0xFF, dac_value & 0xFF])

    # Write the data to the MCP4725
    i2c.writeto(MCP4725_I2C_ADDR, data)

# Main loop
while True:
    try:
        # Prompt user for voltage value
        voltage = float(input("Enter voltage (0.0 to 3.3 V): "))

        # Write the voltage to the MCP4725 DAC
        write_dac(voltage)

        print("Voltage set to {:.2f} V".format(voltage))
    except ValueError:
        print("Invalid input. Please enter a numeric value.")
    except KeyboardInterrupt:
        print("\nProgram terminated by user.")
        break

    utime.sleep(1)