I am using a Boron that sleeps for a long period in ULTRA_LOW_POWER mode (STOP mode would also be OK), then periodically wakes up to take sensor readings.
The Boron is currently powered via the 5V VUSB pin. 3.3V Li+ powering would also be OK for this application.
I’m wondering how to set it up so that the device automatically wakes up whenever a USB cable is inserted?
I have thought of using Li+ to power the Boron and connecting VUSB to the wakeup pin (D8?). However, I’m unsure if this would cause backfeeding to my power supply on Li+.
I’ve read a few offhand posts where people have mentioned this as a possibility. Just wondering if there’s anyone who has actually done it? Or, is there a better approach I should know about?
Thanks in advance! Really enjoying the board so far!