pinail-esp32c3/HARDWARE.md

Hardware Spec (ESP32-C3 Single Nail)

Controller

• MCU: ESP32-C3, 160MHz, 4MB embedded flash.
• USB: native USB Serial/JTAG.

Sensors / Actuation

• Thermocouple frontend: MAX6675 (K-type).
• Relay: SSR/mechanical relay, active HIGH.

GPIO

• D10: relay output
• D9: MAX6675 SCK
• D8: MAX6675 CS
• D7: MAX6675 SO

Safety defaults

• Max temp cutoff: 800F
• Idle shutoff: 30 min
• Near setpoint band for idle: +/-8F

Control timing

• Adjustable via API/UI (loop_size_ms and sleep_time)
• Default profile is responsive (1800ms loop window, 0.2s tick)