ADC Value in NodeRed

General
1

Hello

I have a python program in my raspberry.

from periphery import I2C
def get_adc_value():
	# Open i2c-1 controller
	i2c = I2C("/dev/i2c-1")

	msgs = [I2C.Message([0x61]), I2C.Message([0x00,0x00], read=True)]
	i2c.transfer(0x36, msgs)
	adc_value = (msgs[1].data[0] & 0x0F) <<8 | (msgs[1].data[1])

	# ATTENTION le 4.93 est la tension de ref mesurée à la main
	# pas utile en mode ratiometrique
	adc_value_volt=(adc_value*4.93/4096)
	print("ADC VALUE P4.2: 0x{:04x} , {:0.2f}V".format(adc_value,adc_value_volt))

	msgs = [I2C.Message([0x63]), I2C.Message([0x00,0x00], read=True)]
	i2c.transfer(0x36, msgs)
	adc_value = (msgs[1].data[0] & 0x0F) <<8 | (msgs[1].data[1])

	adc_value_volt=(adc_value*4.93/4096)
	print("ADC VALUE P6.2: 0x{:04x} , {:0.2f}V".format(adc_value,adc_value_volt))

	i2c.close()

I want to integrate this function in my node red in order to have only one point of debug.
Can you tell me how to do it?

Thank You

2

Well you could call it from an exec node. python -u path-to/yourfile.py or did you want to implement it 100% in Node-RED using the i2c node ?

3

I will integrate 100% in node red because the resut of msg does anaylsed in node red

4

If you look in the flows section and search for ADC you will find a number of nodes designed to read from ADC devices attached to a RPi.

eg node-red-contrib-iiot-rpi-ads1115 (node) - Node-RED

5

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