MCP4725_read_write.py

from smbus2 import SMBus
import time

DELAY = 1

# Get i2C bus
bus = SMBus(1)

# 'i2cdetect -y 1' for address
DEVICE_ADDRESS = 0x60
DEVICE_OFFSET = 0x00
BYTES_TO_READ = 2

def convert_to_12bits(data):
    raw_adc = (data[0] & 0x0F) * 256 + data[1]
    if raw_adc > 2047 :
        raw_adc -= 4095

    return raw_adc

'''
def convert(r):
    return ((r[0] & 15) << 8) + r[1]
'''

def convert_to_voltage(raw_adc):
    return raw_adc * 0.00034

def set_voltage(raw_value):
    data = []
    data.append(65)
    data.append(raw_value >> 4)         # MSB
    data.append((raw_value & 15) << 4)  # LSB

    # Write a block of len(data) bytes to address 80 from offset 0
    bus.write_i2c_block_data(DEVICE_ADDRESS, DEVICE_OFFSET, data)

# set_voltage(4096)
# time.sleep(DELAY)

 # Read a block of 2 bytes from address 60, offset 0
data = bus.read_i2c_block_data(DEVICE_ADDRESS, DEVICE_OFFSET, BYTES_TO_READ)

raw_adc = convert_to_12bits(data)
voltage = convert_to_voltage(raw_adc)

print("ADC Raw ADC Output: %d" % raw_adc)
print("ADC Voltage Output: %.2f V" % voltage)