Hu guys,
first post here so I hope I do everything correct!
What I am trying to do:
I'm working on a cool project (audio guestbook) utilizing teensy4.1 with an audio shield.
To power the arduino I use a 18650 battery shield that I "link" in to the USB cable that is pluggin in to the teensy.
To monitor the battery status I additionally connect the 3V bus from the battery shield with Pin 14 on the teensy, from which I read the Voltage with analogRead.
This works perfectly on several systems that I built.
Ground is connected to: Charger/PC via teensy's usb port, battery shield, teensy Gnd pin, some led's, some push buttons
5V goes like this: Host (charger/PC via cut open USB cable) -> battery shield input // battery shield 5V output -> switch -> back to cut open USB cable to teensy
What happens:
Somehow on one system the teensy seems to get powered by the cable leading to Pin 14!
When I unplug the USB cable from the teensy, the battery shield is still connected to Ground on the teensy and it's running!
I measure 3V at the teensy's 3V pin and 2.8V on the 5V pin.
And when I remove the cable from pin 14, the teensy has no power.
To me this is really weird, especially as this exact setup (I could not find any mistakes that are different then the other systems I built before) has been working fine on other systems!
Any ideas on what to check for or what might have gone wrong with this system?
first post here so I hope I do everything correct!
What I am trying to do:
I'm working on a cool project (audio guestbook) utilizing teensy4.1 with an audio shield.
To power the arduino I use a 18650 battery shield that I "link" in to the USB cable that is pluggin in to the teensy.
To monitor the battery status I additionally connect the 3V bus from the battery shield with Pin 14 on the teensy, from which I read the Voltage with analogRead.
This works perfectly on several systems that I built.
Ground is connected to: Charger/PC via teensy's usb port, battery shield, teensy Gnd pin, some led's, some push buttons
5V goes like this: Host (charger/PC via cut open USB cable) -> battery shield input // battery shield 5V output -> switch -> back to cut open USB cable to teensy
What happens:
Somehow on one system the teensy seems to get powered by the cable leading to Pin 14!
When I unplug the USB cable from the teensy, the battery shield is still connected to Ground on the teensy and it's running!
I measure 3V at the teensy's 3V pin and 2.8V on the 5V pin.
And when I remove the cable from pin 14, the teensy has no power.
To me this is really weird, especially as this exact setup (I could not find any mistakes that are different then the other systems I built before) has been working fine on other systems!
Any ideas on what to check for or what might have gone wrong with this system?