A tour of the actual bench, tools, and gear used to build the projects on this site.

A labelled reference to the Raspberry Pi Pico and Pico W’s 40-pin GPIO header, including power, ADC, and the four pins that aren’t what they look like.

What actually separates a Raspberry Pi from an ESP32, and which one fits your first project.

SG90 micro servo wire colours, pinout, and the power-supply mistake that causes most jittering and reset problems.

The common power, signal, and mechanical causes of servo jitter, and how to tell them apart.

The real causes of a failed ESP32 upload, from driver issues to the boot-mode button most boards still need.

2N2222 pinout for the modern TO-92 package, why it’s usually a PN2222A underneath, and what changes on the older metal-can version.

DHT11 and DHT22 pinout, wiring, and the timing quirks of their single-wire protocol that cause most read failures.

LM358 pinout, why its single-supply design differs from a classic split-supply op-amp, and where it trips people up.

Wiring an I2C-backpack character LCD (1602 or 2004) to an Arduino or ESP32, and finding its I2C address.