i designed a PCB to hold a teensy project for a lab i work in .
there are three teensy's in total which share a few signals , meaning , some of the wires that go to one teensy also go to the others . for example the 3.3V pin and 5V pins connects all three of them (i add the file with all connections) .
as soon as i connect one of the teensy's to the usb port , something strange happens: the other teensy which is not connected to anything starts blinking . i ignore it and plug in the second one and i am able to upload the program on both . but as soon as i connect the third one it starts to reset it self every second or so .
what could be the problem ? is there anything acutely wrong with the arrangement i made? i also suspect something went wrong with the reset pin which i connected through all three teensy's to an exterior button .
i would appreciate any leads , in which way i should start looking to see whats wrong . starting from the question , should it work in theory or is there something i didnt consider when making such arrangement .
waiting for answers and would provide further details gladly if needed!
picture of the schematic:
links to pictures of the actuall board
*notice how only one teensy is connectd yet the next one also blinks (the connected one is U1). it is a bit random , at first it would rapidly reset , now id doesn't reset . also sometimes all three blink in sync , now only U1 vand U3.
https://photos.app.goo.gl/ruLiLnYE1Ruy1zsu9
https://photos.app.goo.gl/Dqc6zGVWJAqubcTdA
there are three teensy's in total which share a few signals , meaning , some of the wires that go to one teensy also go to the others . for example the 3.3V pin and 5V pins connects all three of them (i add the file with all connections) .
as soon as i connect one of the teensy's to the usb port , something strange happens: the other teensy which is not connected to anything starts blinking . i ignore it and plug in the second one and i am able to upload the program on both . but as soon as i connect the third one it starts to reset it self every second or so .
what could be the problem ? is there anything acutely wrong with the arrangement i made? i also suspect something went wrong with the reset pin which i connected through all three teensy's to an exterior button .
i would appreciate any leads , in which way i should start looking to see whats wrong . starting from the question , should it work in theory or is there something i didnt consider when making such arrangement .
waiting for answers and would provide further details gladly if needed!
picture of the schematic:
links to pictures of the actuall board
*notice how only one teensy is connectd yet the next one also blinks (the connected one is U1). it is a bit random , at first it would rapidly reset , now id doesn't reset . also sometimes all three blink in sync , now only U1 vand U3.
https://photos.app.goo.gl/ruLiLnYE1Ruy1zsu9
https://photos.app.goo.gl/Dqc6zGVWJAqubcTdA