Well, I got the sensor all wired up, plugged it into it’s own power supply as recommended by the manufacturer and… no joy!

The power supply I used, again as recommended by the manufacturer, is a 5 v supply.  The sensor has a TTL serial output which was no doubt outputting a signal that went from 0V to 5V. This, along with a shared ground were connected to the raspberry pi.

Unfortunately, as I learned through researching why I was not seeing any serial data, the Pi should never be connected to anything that exceeds 3.3V.  Yikes!  I can only hope that I did not burn up the UART (serial communication device).

I have a new 3.3V power supply on order but until it arrives in the middle of next week, I’m stuck.

I also made significant progress over the last couple days getting the new service written for the weather system.  I just have to modify one more file and it should be ready to test.

Today’s results were so frustrating that I’m going to take a break and step away from the project until the new power supply arrives.  If I can’t get measurements from the sensor, there’s no sense in working on troubleshooting the weather system service.

Merry Christmas!