Guides

What Is Strapping Pins and Boot Mode? A 2026 Guide

ESP32 strapping pins explained: GPIO0/2/12/15's boot-time roles, download vs SPI boot mode, and the BOOT+EN recovery dance. India pricing (COD).

What Is PSRAM? Wiring and Errors (2026)

PSRAM explained: why the ESP32-CAM requires it, internal SRAM limits, and how to enable and allocate it. India pricing (COD).

What Is Flash Storage (SPIFFS/LittleFS)? A 2026...

Flash storage (SPIFFS/LittleFS) explained: the ESP32 filesystem, why LittleFS wins, upload steps, and write-wear limits. India pricing (COD).

What Is EEPROM? Wiring and Errors (2026)

EEPROM explained: non-volatile storage, the write-cycle limit, EEPROM.update() for wear reduction, and a marker-byte pattern. India pricing (COD).

What Is a USB-Serial Chip (CH340/CP2102)? A 202...

USB-Serial chips explained: TX/RX crossover, baud rate matching, DTR/RTS auto-reset, and CH340 vs CP2102. India pricing (COD).

What Is MQTT? Wiring and Errors (2026 Guide)

MQTT explained: broker, topics, publish/subscribe, and a real PubSubClient sketch reading a sensor. India pricing (COD).