Hello All! I'm currently putting some LED's under my Electric Longboard, i had the idea because i have some left over WS2812B strips after putting Indicators on my bike helmet!
I Noticed my longboard has a built in 5V system as it has a USB port that outputs 5v at 2.1a, so i took it apart and accessed the pins on the PCB that go to the usb port, and then put an LED between the 5v and ground (for visual verification) and proceeded to press the power button to turn on the USB port. The LED turned on (Yay!) but the LCD screen with battery percentage & input/output voltages didn't indicate anything being used (which makes sense as i didn't have anything on the data pins) i remained hopeful, and then 3 seconds later it turned off... So i plugged my Phone to the USB port and used a multimeter to check the data pins, with GND on the GND pin and positive on Data+ i could see there was 0.93v going through it, i then put the positive on Data- and it was the same result.
I'm not great with all this stuff, so i'm wondering if i need to send a specific signal or just 1v down the data pins to make the board think i have a phone plugged in, thus keeping power output going to to the LED.
unfortunately it transforms the 36v from the battery to 5v somewhere on the PCB and i'm not exactly sure where. i also cant find a constant 5v supply anywhere on the PCB.
I have also tried plugging the Arduino into the USB port via a Mini USB cable, however the arduino doesn't send out an appropriate signal either as the longboard doesn't recognise anything in the USB port.
Thank you for any answers!