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Manage all connected relays
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Wiring Guide
How to connect relays to ESP32 pins
✅ Recommended Relay Pins
| Pin | Label | Notes | Safe |
|---|---|---|---|
| 26 | GPIO 26 | Default in code, no special function | ✓ |
| 27 | GPIO 27 | Reliable output pin | ✓ |
| 25 | GPIO 25 | Also DAC1 but works fine as digital out | ✓ |
| 33 | GPIO 33 | Input only capable, good for relay | ✓ |
| 32 | GPIO 32 | Reliable, no boot issues | ✓ |
| 14 | GPIO 14 | PWM signal on boot — brief pulse, OK for relay | ⚠ |
| 13 | GPIO 13 | Works well for relay output | ✓ |
| 16 | GPIO 16 | UART2 RX but usable as GPIO | ✓ |
| 17 | GPIO 17 | UART2 TX but usable as GPIO | ✓ |
| 18 | GPIO 18 | SPI CLK but usable as GPIO | ✓ |
| 19 | GPIO 19 | SPI MISO but usable as GPIO | ✓ |
| 23 | GPIO 23 | SPI MOSI but usable as GPIO | ✓ |
⚠️ Avoid These Pins for Relays
| Pin | Reason |
|---|---|
| 0 | Boot mode selection — can prevent upload |
| 1 | TX0 — used for Serial Monitor |
| 3 | RX0 — used for Serial Monitor |
| 6-11 | Connected to internal flash — never use |
| 34-39 | Input only — cannot drive relay |
Settings
Configure your system
🔐 Dashboard Password
📡 MQTT Broker Settings
Default: broker.hivemq.com
Must match your ESP32 code
📋 ESP32 Code Snippet
Copy these lines into your ESP32 code — update when you change the topic prefix:
🗑️ Data Management