Servo Tester¶
Test and calibrate up to 6 servos simultaneously with precise PWM control.
Interface¶
Servo Selection (Sidebar)¶
The left sidebar shows buttons 1-6 for each servo channel:
- Tap a button to toggle that servo on/off
- Long press anywhere to toggle all servos on/off
- Selected servos are highlighted in blue
- Multiple servos can be active simultaneously
When multiple servos are selected, they all respond to the same controls but maintain their individual positions.
PWM Display¶
Shows the current PWM pulse width in microseconds (µs).
- When multiple servos are selected, displays the primary (lowest numbered) servo's value with an asterisk (*) suffix
Mode Buttons¶
| Button | Description |
|---|---|
| Auto | Automatic sweep mode |
| Manual | Direct PWM control |
Auto Mode¶
In Auto mode, selected servos sweep continuously between min and max PWM values.
Controls¶
- Start – Begin sweeping
- Stop – Stop sweeping (button turns red while running)
Encoder Actions¶
| Action | Function |
|---|---|
| Rotate | Adjust sweep speed (while running) |
| Double-click | Switch to Manual mode |
| Long press | Toggle all servos on/off |
The sweep speed setting is saved and persists across sessions.
Manual Mode¶
In Manual mode, you have direct control over servo position.
Controls¶
- Slider – Drag to set PWM value
- Min – Jump to minimum PWM
- Center – Jump to center PWM
- Max – Jump to maximum PWM
Encoder Actions¶
| Action | Function |
|---|---|
| Rotate | Adjust PWM value (with acceleration) |
| Double-click | Switch back to Auto mode |
| Long press | Toggle all servos on/off |
Rotation speed affects step size: - Slow rotation = fine adjustment - Fast rotation = larger steps (up to 5× base step)
PWM Settings¶
Configure PWM parameters in Settings:
| Setting | Default | Range |
|---|---|---|
| PWM Min | 1000 µs | 500–1500 µs |
| PWM Center | 1500 µs | 1000–2000 µs |
| PWM Max | 2000 µs | 1500–2500 µs |
| Frequency | 50 Hz | 50 Hz / 333 Hz |
Protocol Presets¶
| Preset | Min | Center | Max | Frequency |
|---|---|---|---|---|
| Standard | 1000 | 1500 | 2000 | 50 Hz |
| Extended | 500 | 1500 | 2500 | 50 Hz |
| Sanwa | 920 | 1520 | 2120 | 50 Hz |
| Futaba | 900 | 1500 | 2100 | 50 Hz |
| Digital Fast | 1000 | 1500 | 2000 | 333 Hz |
| Custom | User-defined |
Hardware Outputs¶
Servos are connected to these GPIO pins (defined in include/pins.h):
| Servo | GPIO |
|---|---|
| 1 | 6 |
| 2 | 15 |
| 3 | 16 |
| 4 | 17 |
| 5 | 18 |
| 6 | 21 |
Use standard 3-pin servo connectors (Signal, VCC, GND). Ensure adequate power supply for your servos – do not power multiple servos directly from the ESP32's 3.3V/5V pins.