Notes on the ESP32-C3 GPIO usage – strapping pins, RTC domain pins, flash pins and tips on how to get maximum GPIOs for your design.
Here is a tiny, low power and accurate I2C sound level sensor module for Arduino, ESP32, and others. Read sound level in A-weighted decibels.
A short note and example schematic for using LED flash with OV2640, OV5640, and any other OmniVision camera sensor module.
Using multiple SIM cards with SIMCom or Quectel modems is easy using multiplexers and a basic logic controller. Modems must support hot swap.
ESP32 with passive PoE is very useful in several applications such as sensor nodes or industrial control units that use power over ethernet.
The ESP32 CH340 programmer schematic is described in brief in this article. This can be used for auto-programming both ESP32 and ESP8266.
Article on how to replace microUSB with USB-C connector in USB 2.0 devices. Real parts and schematics are used as examples.
VS1000 does not have a dedicated line output. We go over some simple VS1000 line out schematics and connections to an audio amplifier.