D1 is the power LED for the input side supply. IC2 is a linear optocoupler and IC3 LM358 is a signal conditioner for the phototransistor. IC1 LM358 is used as a closed-loop servomechanism to sense the photodiode current and drive the LED of the optocoupler. Isolation voltage between input and output is 3750V. The circuit is based on an optically isolated linear optocoupler. Hook up the sensor or analog voltage to the input of this module and connect the output to Analog Pin of Arduino or ADC of any micro-controller. The operating power supply input side and output side is 5V DC. The circuit can also be interfaced with a 10V sensor, for 0 to 10V input, change the resistor R3 to 1.8K and the output will be the same 0 to 3.3V. The module takes 0 to 5V analog input and provides optically isolated 0-3.3V as output. The circuit requires two power supplies for the input and output sides. Interfacing an analog voltage, an analog sensor to Arduino or other various microcontrollers with optical isolation is very easy with this module.
The module is very useful for in-process controls, factory automation, industrial applications, etc. This is an isolated analog input module that is useful for interfacing Analog signals of various types originated from analog sensors and field devices.
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