Generic boards
3 Generic development boards — pinouts, specs, and datasheets.
Generic
Single-channel relay board with an opto-isolated driver so a 5V logic pin can switch mains/high-current loads. Frequently active-LOW. Screw terminals expose COM/NO/NC.
Generic · HC-05
Classic Bluetooth (SPP) serial module — pair it and it acts as a wireless UART. 3.3V logic on RXD (divide from 5V); the KEY pin enters AT command mode.
Generic
The common 0.96-inch 128x64 monochrome OLED module driven by the SSD1306 controller over I2C. Four pins; default I2C address 0x3C. No backlight (self-emissive), readable at wide angles.