Hi,
I am having a bit of trouble getting my phototransistor encoder going. I have attached the circuit I have been using. The circuit is going but it's not outputting a low enough voltage when the phototransistor is dark. I need the voltage to swing from below 0.8v to over 1.6v to ensure the schmitt trigger triggers properly. Currently I can get the output to swing from about 1v to the supply voltage which is fine for the high triggering but not low enough for a low trigger.
I am using this Ir led/phototransistor pair to read an encoder wheel.
I have spent the last few hours trying to figure this problem out but with no success. Any suggestions would be much appreciated
I am having a bit of trouble getting my phototransistor encoder going. I have attached the circuit I have been using. The circuit is going but it's not outputting a low enough voltage when the phototransistor is dark. I need the voltage to swing from below 0.8v to over 1.6v to ensure the schmitt trigger triggers properly. Currently I can get the output to swing from about 1v to the supply voltage which is fine for the high triggering but not low enough for a low trigger.
I am using this Ir led/phototransistor pair to read an encoder wheel.
I have spent the last few hours trying to figure this problem out but with no success. Any suggestions would be much appreciated
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