Risk of damaging the microcontroller. Badly designed circuit.
rtek1000 opened this issue · 1 comments
rtek1000 commented
Hi,
As we can see in the electronic diagram, the LED of the relay can carry out a high voltage return if it fails in the reverse voltage, probably when using a power supply greater than the value that the LED supports in the reverse polarization (generally it is only 5V ).
See details in this issue: mister-grumbler/w1209-firmware#22
Please disclose this design error to avoid unnecessary damage.
TG9541 commented