Maybe I should start a new thread? Its all related though..
Same project: Moisture sensor as note above.
Water pump,
Motor Driver board and a
Buck converter from 12V battery to 5V logic.
Originally I designed this around a Trinket MO. Was going along great, 'till I found out that there was no EEPROM to store setup parameters in. While trying a workaround, I killed the Trinket. At the same time the one that had been running for weeks watering plants, up and died as well. Odd that..
Whatever, spend a couple days redesign the thing to hold a Teensy3.2 wire it in and.. I got one of these systems running last night. I checked, and it was happily running this morning.
Now, I wonder how I was able to get one running? Because, I can't get the second one to work at all.
1) Take fresh Teensy 3.2 out of bag.. Flash any code in it that prints to the serial monitor to show that your code is alive.
2) Test it on a USB cable.. Good.
3) Solder the buck converter to it. But don't connect its input to anything. - The teensy won't talk to the host computer.
4) Hook the power source to the buck converter. It shuts down your computer's USB port.
I'm stumped. Is there a trace I should cut that I'm missing here?
-jim lee