Hi folks,
I recently tried setting up a hardware-tiny instance. I have the ESP32 DevKitC and received 5 PCBs from JLPCB. All five have the same issue: the 3v3 socket on the PCB is receiving 12V, instead of 3.3V. I tried bypassing the 3v3 socket (by bending the corresponding ESP32 pin out of the way) and instead USB powering the ESP32; that 'worked,' in the sense that the 3v3 socket is no longer being overpowered, but the esphome logs show that the device is sending commands (a "no fan mode set; defaulting to Medium") but never receiving anything back. Inspecting the voltage on LIN on the PCB, the voltage never changes when commands are being sent...implying that the commands are never actually being sent over the wire. I can confirm that the voltage does dip on GPIO26, so the commands are being send from the ESP32 to the PCB, but the PCB's U2 component (the only bit that sits between GPIO26 and LIN) clearly is not doing its job. It's possible that I damaged U2 by subjecting it to 12V power before figuring out the USB-powering solution. Unfortunately, I tried all 5 of my PCBs before figuring this out, so it's possible that I 'broke' all of them in this way.
Anybody else run into an issue like this? Any suggestions on anything else I can try, or am I just out of luck at this point?
Hi folks,
I recently tried setting up a hardware-tiny instance. I have the ESP32 DevKitC and received 5 PCBs from JLPCB. All five have the same issue: the 3v3 socket on the PCB is receiving 12V, instead of 3.3V. I tried bypassing the 3v3 socket (by bending the corresponding ESP32 pin out of the way) and instead USB powering the ESP32; that 'worked,' in the sense that the 3v3 socket is no longer being overpowered, but the esphome logs show that the device is sending commands (a "no fan mode set; defaulting to Medium") but never receiving anything back. Inspecting the voltage on LIN on the PCB, the voltage never changes when commands are being sent...implying that the commands are never actually being sent over the wire. I can confirm that the voltage does dip on GPIO26, so the commands are being send from the ESP32 to the PCB, but the PCB's U2 component (the only bit that sits between GPIO26 and LIN) clearly is not doing its job. It's possible that I damaged U2 by subjecting it to 12V power before figuring out the USB-powering solution. Unfortunately, I tried all 5 of my PCBs before figuring this out, so it's possible that I 'broke' all of them in this way.
Anybody else run into an issue like this? Any suggestions on anything else I can try, or am I just out of luck at this point?