cawy7 Posted September 26, 2018 Share Posted September 26, 2018 Hello! I've been having a mystifying issue and was hoping someone would be able to help. I have been fiddling with a WF32 project involving a barcode communicating over serial and a quadrature rotary encoder 200 P/R. I am unable to run both at the same time right now. I am running the encoder and barcode scanner from a 12VDC Battery, the encoder is open collector so because the WF32 has no internal pull-up resistors on most digital pins, I have made my own using about 18k resistors. The WF32 is being powered over UART right now, although I have tried to tie it into a 5VDC power supply with no luck. TX/RX from the barcode scanner is going to PIN 39/40 on the WF32, Can communicate when the common is disconnected from the 12VDC common Encoder signals are going to PIN 8/9, Will work when the common is connected to the 12VDC common Here is the basic circuit (I couldn't find proper components in fritzig at all so I made do with some ms paint haha). The red circle is the issue, if I connect it I get encoder but not barcode, vice versa if I remove it. Would be happy to share more if more information is needed. Link to comment Share on other sites More sharing options...
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