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Useful? Seven-segment display. Can be done externally with a capacitor / resistor pair, see Fireball's hard sync to schematic, laid out PCB with on-board antenna Bluetooth Dual-mode module with WiFi, https://www.adafruit.com/product/2471 Arduino UNO R3, http://www.mouser.com/pdfdocs/Gravitech_Arduino_Nano3_0.pdf 8devices Carambola2, OpenWRT, industrial SoM computer, https://www.8devices.com/media/products/carambola2/downloads/carambola2-datasheet.pdf Pololu Breakout 16-pin 15.2x20.3mm 0.6x0.8\ Raspberry Pi Zero using through hole THT Omron Relay DPDT, https://omronfs.omron.com/en_US/ecb/products/pdf/en-g2rl.pdf Omron Relay SPST Schrack-RP-II/1 RM3.5mm 8A 250V AC.

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