3000F :lol: 3.8V supercapacitors are incredibly useful because you can charge them directly from a 3.3V power source, and discharge them at nearly 3.3V for a loooong time. Paired with an LDO with a very low voltage dropout such as the TLV75533, one could probably power an ESP32 in deep sleep indefin...

Thanks for the information, rudi. I snatched up a dozen samples of the S2-MINI from Digi-Key the moment I saw they had them for sale (as well as the ludicrously small and powerful ESP-PICO-MINI). I’m glad Espressif caught the problem before it was too late, the S2 chips are amazing and I think they’...

Supercapacitors have come a long way over the years, and recently some high capacity 3.8V supercapacitors have hit the market at very reasonable prices. This is a 30F Eaton supercapacitor charged up to 3.3V powering an ESP32-S2 board completely — it can provide more than enough power for WiFi transm...

Very nice! I’m working on a couple of esp32-s2-based projects and its astounding how easy (and CHEAP!!) it is to make a custom pcb for these modules. I’m using the new MINI modules for one, and the PCB is only as wide as the module (<17mm), and the BOM for it is less than $2 USD, including the modu...

I’ve had some engineering samples of the S2-MINI modules since early November, with the impression that they were just awaiting certification before entering mass production. What is the status on these modules? Are they still coming, or did Espressif have to go back to the drawing board on them? No...

Very nice! I’m working on a couple of esp32-s2-based projects and its astounding how easy (and CHEAP!!) it is to make a custom pcb for these modules. I’m using the new MINI modules for one, and the PCB is only as wide as the module (<17mm), and the BOM for it is less than $2 USD, including the modul...

The error is telling you that the URL you are pointing to <i>is</i> a valid URI — there is something there, but whatever it is, it’s not what the websocket client is looking for. Try taking the URL that the client app is directed to, only with “http://” in place of “ws://“, and maybe you’ll have a b...

As for B, the LED is there to demonstrate how you can use addressable LEDs, not so you can use it as an emergency flashlight. Powering it at 5v is a waste of circuitry for no practical benefit whatsoever.

You heard right, you cannot use just any GPIO. scl can be GPIO_0 or GPIO_2, and sda can be GPIO_1 or GPIO_3. You need to use registers RTCIO_SAR_I2C_SCL_SEL and RTCIO_SAR_I2C_SDA_SEL to point to the correct pins. In general, when using the ULP for GPIO access, you need to be using GPIO pins handled ...