Custom esp32 h2 board keeps rebooting.
Posted: Sun Apr 27, 2025 4:18 am
Clearly I've done something wrong but I don't know what...
I've designed a custom esp32 H2 based board for a project and I'm having a ton of issues with it unfortunately.
when plugging it in via usb my windows machine sees it and correctly identifies it as an esp32 board, but it just keeps rebooting fairly quickly in a loop. I can't upload any code to it.
I had 2 of these custom boards assembled and I've de-soldered the h2 chip from one of them and soldered on an h2 'super mini board', even wiring in pin 26 and 27 to the usb data lines and
it works fine. so other parts of my board don't seem to be causing the issue. it seems like I've missed a resistor or capacitor around the esp32 that it needs to be stable on boot..
The 3.3v regulator is an ap2112k so it should be enough as it powered the esp32 wroom module fine in a previous iteration.
I've tried to find multiple different schematics for the H2 but I'm unclear. on GPio8 some have 10k resistors going to 3.3v others have 0.1uf caps going to ground. Some designs leave vbat empty, another tied it into a 10k resistor, a 1uf cap and then ground.
Some designs have 10k resistors on GPIO9, some don't...
any ideas?
I've designed a custom esp32 H2 based board for a project and I'm having a ton of issues with it unfortunately.
when plugging it in via usb my windows machine sees it and correctly identifies it as an esp32 board, but it just keeps rebooting fairly quickly in a loop. I can't upload any code to it.
I had 2 of these custom boards assembled and I've de-soldered the h2 chip from one of them and soldered on an h2 'super mini board', even wiring in pin 26 and 27 to the usb data lines and
it works fine. so other parts of my board don't seem to be causing the issue. it seems like I've missed a resistor or capacitor around the esp32 that it needs to be stable on boot..
The 3.3v regulator is an ap2112k so it should be enough as it powered the esp32 wroom module fine in a previous iteration.
I've tried to find multiple different schematics for the H2 but I'm unclear. on GPio8 some have 10k resistors going to 3.3v others have 0.1uf caps going to ground. Some designs leave vbat empty, another tied it into a 10k resistor, a 1uf cap and then ground.
Some designs have 10k resistors on GPIO9, some don't...
any ideas?
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