CE_PYTHON_LIB/ADC121C021.py at master · ControlEverythingCommunity/CE_PYTHON_LIB · GitHub

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# Distributed with a free-will license.
# Use it any way you want, profit or free, provided it fits in the licenses of its associated works.
# ADC121C021
# This code is designed to work with the ADC121C021_I2CADC I2C Mini Module available from ControlEverything.com.
# https://www.controleverything.com/content/Analog-Digital-Converters?sku=ADC121C021_I2CADC#tabs-0-product_tabset-2

import smbus
import time

# Get I2C bus
bus = smbus.SMBus(1)

# I2C address of the device
ADC121C021_DEFAULT_ADDRESS				= 0x50

# ADC121C021 Register Map
ADC121C021_REG_CONVERSION				= 0x00 # Conversion Result Register
ADC121C021_REG_ALERT_STATUS				= 0x01 # Alert Status Register
ADC121C021_REG_CONFIG					= 0x02 # Configuration Register
ADC121C021_REG_LOW_LIMIT				= 0x03 # Alert Low Limit Register
ADC121C021_REG_HIGH_LIMIT				= 0x04 # Alert High Limit Register
ADC121C021_REG_HYSTERESIS				= 0x05 # Alert Hysteresis Register
ADC121C021_REG_LOWCONV					= 0x06 # Lowest Conversion Register
ADC121C021_REG_HIGHCONV					= 0x07 # Highest Conversion Register

# ADC121C021 Configuration Register
ADC121C021_CONFIG_CYCLE_TIME_DIS		= 0x00 # Automatic Conversion Mode Disabled, 0 ksps
ADC121C021_CONFIG_CYCLE_TIME_32			= 0x20 # Tconvert x 32, 27 ksps
ADC121C021_CONFIG_CYCLE_TIME_64			= 0x40 # Tconvert x 64, 13.5 ksps
ADC121C021_CONFIG_CYCLE_TIME_128		= 0x60 # Tconvert x 128, 6.7 ksps
ADC121C021_CONFIG_CYCLE_TIME_256		= 0x80 # Tconvert x 256, 3.4 ksps
ADC121C021_CONFIG_CYCLE_TIME_512		= 0xA0 # Tconvert x 512, 1.7 ksps
ADC121C021_CONFIG_CYCLE_TIME_1024		= 0xC0 # Tconvert x 1024, 0.9 ksps
ADC121C021_CONFIG_CYCLE_TIME_2048		= 0xE0 # Tconvert x 2048, 0.4 ksps
ADC121C021_CONFIG_ALERT_HOLD_CLEAR		= 0x00 # Alerts will self-clear
ADC121C021_CONFIG_ALERT_FLAG_NOCLEAR	= 0x10 # Alerts will not self-clear
ADC121C021_CONFIG_ALERT_FLAG_DIS		= 0x00 # Disables alert status bit in the Conversion Result register
ADC121C021_CONFIG_ALERT_FLAG_EN			= 0x08 # Enables alert status bit in the Conversion Result register
ADC121C021_CONFIG_ALERT_PIN_DIS			= 0x00 # Disables the ALERT output pin
ADC121C021_CONFIG_ALERT_PIN_EN			= 0x04 # Enables the ALERT output pin
ADC121C021_CONFIG_POLARITY_LOW			= 0x00 # Sets the ALERT pin to active low
ADC121C021_CONFIG_POLARITY_HIGH			= 0x01 # Sets the ALERT pin to active high

class ADC121C021():
	def __init__(self):
		self.data_config()

	def data_config(self):
		"""Select the Configuration Register data from the given provided values"""
		DATA_CONFIG = (ADC121C021_CONFIG_CYCLE_TIME_32 | ADC121C021_CONFIG_ALERT_HOLD_CLEAR | ADC121C021_CONFIG_ALERT_FLAG_DIS)
		bus.write_byte_data(ADC121C021_DEFAULT_ADDRESS, ADC121C021_REG_CONFIG, DATA_CONFIG)

	def read_adc(self):
		"""Read data back from ADC121C021_REG_CONVERSION(0x00), 2 bytes
		raw_adc MSB, raw_adc LSB"""
		data = bus.read_i2c_block_data(ADC121C021_DEFAULT_ADDRESS, ADC121C021_REG_CONVERSION, 2)

		# Convert the data to 12-bits
		raw_adc = (data[0] & 0x0F) * 256 + data[1]

		return {'r' : raw_adc}

from ADC121C021 import ADC121C021
adc121c021 = ADC121C021()

while True :
	adc = adc121c021.read_adc()
	print "Digital Value of Analog Input : %d "%(adc['r'])
	print " ********************************* "
	time.sleep(1)