BUILD NOTES
DSC-HUB build
A headless ESP32, three DHT22 tails, a CO2 input and six PWM channels. The hub runs the climate ladder and its own failsafes; the Pi brain switches the plugs.
Order of operations. The pins below are the ones the v4 firmware expects on an ESP32-WROOM-32.
Problem
A pile of ESPHome YAML is not a controller until the output chain is metered and the fail-safe is proven.
Build
ESP32-WROOM-32 in the box. DHT22 tent on GPIO27, room on GPIO4, clone on GPIO13. CO2 sensor voltage on GPIO34. Fans and lamps on 1 kHz PWM through PWM-to-0-10 V modules jumped to 0-10 V, labelled both ends.
Result
Fans answer the dashboard and the DSC-Control panel. Above 35 °C, or with a dead tent sensor, the hub's own failsafe takes over, Pi or no Pi.
How it works
Bench
No screen or dial on the hub since v4: the DSC-Control panel is the glass, over ESP-NOW. Tails long enough to reach intake and clone canopy. Use a WROOM-32: GPIO16/17 are PSRAM pins on WROVER modules.
Output chain
GPIO16 exhaust outside, GPIO17 main intake, GPIO18 clone intake, GPIO19 exhaust to room, GPIO23 clone lamp dim, GPIO5 4x8 lamp dim. Set every converter jumper to 0-10 V. 0 / 50 / 100% duty, meter the module (expect a small floor voltage at 0%).
Install
Tent sensor at canopy, room at intake, clone on a yoyo. Confirm gentle negative pressure at baseline. A typical chain is room → 2x4 → 4x8.
Bind
Heater, heat mat, humidifier and dehumidifier sit on Sonoff BASIC R2 plugs. The hub raises demand and the Pi brain switches the relay. Every plug boots OFF and drops OFF after 90 s without the brain.
Diagram
Milestones
- 1. Bench
- 2. Meter outputs
- 3. Flash
- 4. Tent
- 5. Bind
- 6. Unplug test
Cost band + next
Buy-new parts: the kit list in the user guide. Dumpster substitutes: Dumpster Edition.
Then flash. Then do not skip the unplug test.