One thing I've found helpful when experimenting with deep sleep ..... is to add a short startup delay (even 3–5 seconds) during development ..... before entering the sleep loop. It gives you enough time to reconnect the programmer or serial monitor if you need to flash new firmware, and you can ...

I think the biggest difference is that when you build with ESP-IDF, the second-stage bootloader and startup code have already initialized a lot of the hardware before app_main() is called. When you flash your own binary at 0x0, you're effectively replacing that entire boot flow, so you become ...

On ESP32-S3 the default SPI pins may not match the pins used by your SD card module. Unlike many ESP32 boards, you often need to define the SPI pins manually.

Try something like this:

#include <SPI.h>
#include <SD.h>

#define SD_CS 10
#define SD_MOSI 11
#define SD_MISO 13
#define SD_SCK 12 ...

Would comparator hysteresis be the correct hardware fix?


Yes, it will fix thigns ... what’s happening here is:

Input hovers around the threshold
Noise causes the comparator to toggle rapidly
MCU sees multiple edges .... so multiple interrupts

Adding hysteresis (positive feedback) creates two ...

Hi all,

I’ve been optimizing my ESP32 hardware workflow lately and came across tools that try to automate the PCB manufacturing handoff directly from EDA tools (KiCad, etc.).

For example, some toolkits can generate everything in one step:

Gerber files
BOM (with MPNs)
Pick-and-place files
Assembly ...

I would recommend separate planes for high-current LED power and ESP32 logic ..... especially if your board is big or the LEDs draw a lot of current ..... that keeps switching noise away from the logic.

For smaller boards with short traces, a single ground plane can work as long as you carefully ...

As stated by Sprite, its a power issue .... Your ESP32 likely resets because the LED strip draws high current spikes, which can cause voltage drop on 3.3 V. .... Use a separate 5 V supply for the LEDs, keep the ESP32 logic supply isolated, and make sure the grounds are connected at a single point ...

Search out brown-out spikes .... Your ESP32 GPIOs are likely getting damaged ..... when the battery drops very low.

Best practice is to place a 10–100 µF capacitor across 3.3 V and GND near the LoRa module.

I wouold recommend yo u to use 100–220 ohm resistor on TX/RX

Check this guide, will save ...

Hello all,

I’m in the middle of trying to build a DIY Low-cost oscilloscope with ESP32 .... but I’m running into a few issues and could use some hlp. HEre's my setup:

1) ESP32 Dev Kit (WROOM-32)
2) Attempting to read analog signals (0–3.3V) via the onboard ADC
3) Planning to display results on ...

Most likely its not a dead board .... power or boot issue

ESP32-CAM should be powered from 5V pin ... FT232 adapters often cant supply enough current ... resulting in “no serial data” error