https://electwork.net/en/tags/esp32/ Recent content in ESP32 on Electronics Lifehack! https://electwork.net/images/ogp-default.jpg?v=3 https://electwork.net/images/ogp-default.jpg?v=3 Hugo -- gohugo.io en Mon, 20 Jul 2026 00:00:00 +0900 https://electwork.net/en/posts/i2c-spi-uart-comparison/ Mon, 20 Jul 2026 00:00:00 +0900 https://electwork.net/en/posts/i2c-spi-uart-comparison/ How I2C, SPI and UART differ, compared by signal count, speed, multi-device support and wiring distance. Covers pull-up sizing, SPI modes 0-3 and baud rate, with a decision flow for Arduino, ESP32 and STM32. https://electwork.net/en/posts/esp32-mcp23017/ Thu, 30 Sep 2021 00:00:00 +0900 https://electwork.net/en/posts/esp32-mcp23017/ How to use the MCP23017 I/O expander with an ESP32: pin assignments, I2C address selection with A0–A2, a schematic with 8 LEDs and 3 switches, and Adafruit_MCP23X17 sample code. Up to 8 devices, 128 pins. https://electwork.net/en/posts/esp32-clock-pcb1/ Sat, 04 Sep 2021 00:00:00 +0900 https://electwork.net/en/posts/esp32-clock-pcb1/ Building a network digital clock with an ESP32: NTP time sync, an RTC for timekeeping, six large LCD panels driven by three MCP23017 I/O expanders, PCB layout in KiCad 8.x and ordering the board from JLCPCB.