Guides

What Is GPIO Current Limits? Wiring and Errors ...

GPIO current limits explained: per-pin and total budgets by family, resistor sizing for LEDs, and when to switch to a MOSFET. India pricing (COD).

What Is Breadboard Basics? Wiring and Errors (2...

Breadboard basics explained: the hidden rail-and-row wiring pattern, how to use it, and what a prototyping breadboard isn't for. India pricing (COD).

What Is OTA (Over-the-Air) Firmware Updates? A ...

OTA firmware updates explained: the partition-and-rollback mechanism, ArduinoOTA vs HTTP OTA, and a working sketch. India pricing (COD).

What Is Brownout Detection? Wiring and Errors (...

Brownout detection explained: what actually triggers the reset, how to tell it from a crash, and the ESP32 vs AVR fix. India pricing (COD).

ESP32 Bluetooth HFP Voice Agent (Advanced Build)

Build an ESP32 Bluetooth HFP voice agent with Soldr: real board tradeoffs, an honest catalog limit, and a firmware starting point. Parts from Rs.921.

Line Follower Robot Arduino Build (Under Rs.1,500)

Build a line follower robot for under Rs.1,500: ESP32-C3, L298N and 5 IR sensors. Real Soldr screenshots, honest power-fix notes, and full copy-paste code.