I am working on a Smart Energy Meter and I need to read 2 values on one ADC pin of Esp8266. So for this purpose i am using 4051 Mux. I am using Op amp as differential amplifier to measure 220v ac and ACS712 Arduino Module to Measure Current. The problem is that when i connect circuit of Differential Amplifier with Mux the Voltage drops to Zero. I used 2n2222 bjt in Common Collector configuration and got output as near to .5v but now ADC don't read it correctly. It's value doesn't change even if i change current at ACS712 or voltage at ADC after common emitter bjt. But Serial Monitor value don't change and keep fluctuation between 300 to 600. Can anyone help.
Thank you
Thank you