I made a project a few years back using a 28X1 chip to read 8 DS18B20 temperature sensors and send to my com1 port.
Well it crapped out. I have voltage at all my sensors (inputs) and I know my program is running because I have an LED flash after each readings are taken every second.
But I am not getting any data in my serial port.
I used the most basic wiring requirement from the chip data sheet for Tx / Rx.
How can I trouble shoot the serial output using a multimeter?
I thought I should see a ~5v spike every second but I dont have any voltage across ground and output pin 7.
Any Ideas?
It has been years so I can not easily troubleshoot in field.
Well it crapped out. I have voltage at all my sensors (inputs) and I know my program is running because I have an LED flash after each readings are taken every second.
But I am not getting any data in my serial port.
I used the most basic wiring requirement from the chip data sheet for Tx / Rx.
How can I trouble shoot the serial output using a multimeter?
I thought I should see a ~5v spike every second but I dont have any voltage across ground and output pin 7.
Any Ideas?
It has been years so I can not easily troubleshoot in field.
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