![]() ![]() The end game is that the MCU reads the output of two opto-couplers. But, you also need to transmit a sync signal from the isolated side via another opto to the non-isolated side:. So, when the comparator switches, this can be seen on the non-isolated side using an opto-isolator. The other input can connect to a voltage divider that "pots down" the 10 volt to 30 volt supply so that you get a measurement voltage that is within the 5 volt and 0 volts limit of the comparator and ramping voltage. ![]() Then, use a comparator with one input connected to the ramping voltage I just mentioned. That small circuit would generate a ramping voltage on a fixed time base of (say) 10 milli seconds (for example). On the isolated side (the side that has a voltage varying between 10 volts and 30 volts whose value you want to transmit to an MCU on the non-isolated side), you could power a 5 volt regulator to provide a stable voltage for a small circuit. Probably some mathematical methods that compensate error of the general optocoupler? Can TL431 be utilized somehow? I will avoid digital isolators and isolation amplifiers for now due to their cost.Īre there any other techniques, or circuits that I can implement cheaply? Mainly hoping to implement this using general optocouplers. I have tried voltage to frequency conversion technique using a 555 timer. So, I guess the use of two general optocouplers does not work for this circuit as I have to implement the circuit on multiple units. The difference is high enough to produce high error. But, it generates different outputs when I replace one optocoupler with another optocoupler from the same model. I have used two CNY17-2 general optocouplers in place of one linear optocoupler. I have looked at the linear optocoupler photoconductive circuit. For example, the microcontroller reads 15.36V. The measured voltage level/information is sent via an optocoupler to the ADC pin of a microcontroller. The measurement is done by the circuit, not manual. I am trying to make a circuit that measures 10-30V DC with isolation. ![]()
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