Multifunction Speed Controller Specifications
These specifications apply to the multifunction speed controller marked V1.1 on the back and running firmware with the K1 menu. It converts input from the onboard knob or an external Hall throttle into 50 Hz RC pulses or duty-cycle PWM. See the user manual for wiring and setup. Select an illustration to open it full size.
Front interfaces
| Marking | Function |
|---|---|
| J1 | With the three pins at the top, left to right is 3 PWM, 2 VIN, 1 GND. Ground is marked G on the board. |
| J2 (marked S1) | Two-pin switch connection. The current firmware uses pin 2 for reverse input and pin 1 for GND. |
| VR1 | Onboard speed control knob. |
| K1 | Menu button for changing values and advancing through settings. |
| Display and status LED | The display shows output percentage or menu values. The status LED flashes in the menu and stays on in reverse. |
Rear interfaces
| Marking | Function |
|---|---|
| Single-direction bridge | Bridge the pads with power off to force single-direction 50 Hz RC output. |
| P1 / P2 (marked “reverse”) | Run interlock in the current firmware. P2 is the signal and P1 is GND. |
| J2 (marked “run switch”) | Reverse input in the current firmware. This is the same two-pin connection marked S1 on the front. |
| 3V3 / IN / GND | Original knob holes. For a compatible Hall device, connect supply, signal, and ground, and disconnect the onboard knob wiper. |
| J3 | Factory service port. |
Use connector numbers and the documented firmware functions when wiring switches. The reverse and run-switch labels on the V1.1 board are swapped relative to the current firmware.
Electrical and mechanical specifications
| Parameter | Specification |
|---|---|
| Board supply | 5–16 V DC through VIN and GND on J1 |
| PCB dimensions | 31.5 × 12.8 mm (length × width) |
| Mounting holes | Two Ø2.1 mm holes |
| PWM signal | 3.3 V logic, push-pull output |
| 50 Hz RC, single direction | 0.95–2.00 ms, with 0.95 ms as the stop pulse |
| 50 Hz RC, bidirectional | 1.50 ms neutral, 1.50–2.00 ms forward, 1.50–1.00 ms reverse |
| Duty-cycle PWM | 0–100% at 1, 20, or 24 kHz |
| Throttle input | Onboard knob or external Hall throttle or pedal. Hall input is calibrated for 0.85–2.30 V. |
| External switches | Normally open or normally closed run interlock. Reverse input for 50 Hz bidirectional operation. |
The 5–16 V range applies to the controller board. Supply the ESC, driver, and load according to their own specifications and share signal ground with the controller.