Initial ESP32-C3 single-nail firmware with Wi-Fi onboarding

2026-03-13 22:38:46 +00:00
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+# 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`