epicycloid
Well-known member
I need a quick sanity check on powering my Teensy 3.1's and using the Teensy Proto Boards.* I have read the future wiki linked thread 5x, and I am still confused.
I have a second board with a 24V supply, stepper motor drivers, and a DC-DC converter that outputs 5V (used for opto's & other 5V items). I'm using the 5V from that to power the Teensy and TFT (ILI9341 from Teensy's 3V3). Because the incoming 5V is lower than the 5.2V minimum input for the voltage regulator on the proto board, I want bypass the regulator and route the incoming 5V directly into the 5V (Arduino) header on the proto board, which goes via a trace and jumper, to Vin on the Teensy.
1) Is there a conflict in having two power sources, e.g. only while I'm programming the Teensy, the 5V feeding Vin and USB? Once programming is done, the 5V into Vin would be the only source.
2) When *should* I cut the Vin--USB trace on the Teensy? Does that just remove the 5V coming in through the USB cable when connected? I am a bit foggy on the scenarios.
Thanks,
--Jon
* Note that there is an error only on the top of the board drawing that has "5V" and "VIN" mixed up. The silkscreen in the photos of the boards shows VIN and 5V correctly.
I have a second board with a 24V supply, stepper motor drivers, and a DC-DC converter that outputs 5V (used for opto's & other 5V items). I'm using the 5V from that to power the Teensy and TFT (ILI9341 from Teensy's 3V3). Because the incoming 5V is lower than the 5.2V minimum input for the voltage regulator on the proto board, I want bypass the regulator and route the incoming 5V directly into the 5V (Arduino) header on the proto board, which goes via a trace and jumper, to Vin on the Teensy.
1) Is there a conflict in having two power sources, e.g. only while I'm programming the Teensy, the 5V feeding Vin and USB? Once programming is done, the 5V into Vin would be the only source.
2) When *should* I cut the Vin--USB trace on the Teensy? Does that just remove the 5V coming in through the USB cable when connected? I am a bit foggy on the scenarios.
Thanks,
--Jon
* Note that there is an error only on the top of the board drawing that has "5V" and "VIN" mixed up. The silkscreen in the photos of the boards shows VIN and 5V correctly.
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