iznogoud320
New member
Hi everyone,
I'am probably missing something basic, but I'm new to teensy and have trouble using the board using external power supply.
I'm working with an (original) Teensy 4.1.
As stated in documentation I cut the pad close to Vin Pin and then attached a 5V power supply To VIn and GND Pin.
If I plug my USB cable to program the board, the LED close to the USB plug turns ON (RED continuous) and Serial port is not detected.
Edition with more details
I have noticed this: when USB powered, as soon as I plug something on 3.3V pin the Voltage measured drops to 2.9V. Might it indicate a problem with the onboard 3.3V regulator?
Any advice?
Thanks for your help,
Michael.
I'am probably missing something basic, but I'm new to teensy and have trouble using the board using external power supply.
I'm working with an (original) Teensy 4.1.
As stated in documentation I cut the pad close to Vin Pin and then attached a 5V power supply To VIn and GND Pin.
If I plug my USB cable to program the board, the LED close to the USB plug turns ON (RED continuous) and Serial port is not detected.
Edition with more details
I have noticed this: when USB powered, as soon as I plug something on 3.3V pin the Voltage measured drops to 2.9V. Might it indicate a problem with the onboard 3.3V regulator?
Any advice?
Thanks for your help,
Michael.
Last edited: