![]() ![]() I plan to use the following level shifter using two NPN TRs instead of an PNP-NPN TRs, is it possible ? the circuit didn't work, and i get always 0V at the uC input, what could be wrong with my drawing? I followed the circuit paths from the sensor until the input of the Micro controller and i found it wired in the following way:Īs you can notice, the circuit designer used a PNP transistor combined with an NPN transistor.ġ/ What is the purpose of this transistors combination ?Ģ/ Is it a level shifter ? if yes, is it really necessary ? As i already seen Arduino interfaced with such sensors with only a pull-up resistor not matter power source of the sensor.ģ/ During simulation in Proteus ISIS, i simulated the inductive proximity sensor as a switch. I'm trying to repair an old circuit based on the Micro-controller S87C751 interfaced with an inductive proximity sensor similar to one already posted here
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