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

• GPIO2: relay output
• GPIO4: MAX6675 SCK
• GPIO5: MAX6675 CS
• GPIO6: MAX6675 SO

Safety defaults

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

Fixed control timing

• PWM/control loop window: 1800ms
• Control tick: 200ms