In using the One+ while connected to a car (or regulated PSU) I have found that power is actually coming back across the USB serial connection into the host computer (see attached screenshot). While the voltage is low, I am concerned there is a risk of damaging the connected PC when debugging the device (to view the serial logs) if the vehicle sends a surge.
Can you confirm this is working as intended please. It seems (at first glance) that the device is missing a diode or two to prevent power feeding back up the USB cable.
Edit: It seems I cant attach an image to my post. The image shows a Legion power meter connected to the USB port of the One+, with no connection at the other end, receiving 2.8v across the wire.
User feedbacks of the latest ESP32 based Freematics ONE+
2 posts • Page 1 of 1
This is true. The USB port can be used for power output. But no damage happens from my thousands hours of in-car debugging. If our device can't resist a surge, it won't last long when working unattended in car.
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