I am adding a ESP32 (Dorhea ESP32 Mini (Amazon)) to an electric shop heater. The logic board in the heater has a 7805 regulator. There is a microcontroller and relays that control the heater elements. Of course, the main logic board is powered at the 5V rail without the heater being powered on (stand by mode). I want to power the ESP32 d1 mini from the same 5V rail. While the ESP32 tries to boot it fails, when power from the 7805. The d1 mini has a 5v to 3.3v regulator on it. The added esp32 circuit needs < 170mA to boot and around 100-60mA while running. The esp32 d1 mini boots runs fine on the bench. When powered from the 5V rail (7805) it only seems to draw 80mA even during boot, it seems like the current is limited to supply the d1 mini. I have checked continuity and I am connected to the v-out of the 7805, through 0-ohm resistors and traces.
What would be limiting the current? Or might there be other issues? Any ideas?
Thanks!!!
What would be limiting the current? Or might there be other issues? Any ideas?
Thanks!!!