Wiring, Power & Control Guide: DHMCU DHPS380 Digital Servo

How Do You Wire and Power the DHMCU DHPS380?

Direct Answer: The DHMCU DHPS380 utilizes separate high-current DC power cables (12V–24V DC) and a standard 3-pin JR connector for standard PWM control signals (3.3V–5.0V logic, 50–333 Hz, 0.5–2.5ms or 1.0–2.0ms pulse widths).

Evidence: Heavy-duty actuators producing 200–400 kg·cm of torque draw substantial current under stall loads (recommended power: 24V 10A DC regulated supply or 4S–6S LiPo battery). Isolating high-current power leads from low-voltage signal wires prevents ground loops, electrical noise, and microcontroller brownouts.

Wiring Pinout & Connection Diagram

Cable Group	Wire Color	Function	Connection Target
High-Current DC Power	Thick Red Wire	DC Supply (+) [12V – 24V]	Direct to 12V–24V DC battery (+) or power rail
High-Current DC Power	Thick Black Wire	DC Supply Ground (-)	Direct to battery (-) / common ground bus
3-Pin JR Signal Connector	Orange Wire	PWM Signal Input	Microcontroller PWM pin / RC Receiver CH1-CH8
	Red Wire	NC (Not Connected)	Leave disconnected (Internal power isolation)
	Brown / Black Wire	Signal Ground (GND)	Microcontroller / Receiver GND (Common Ground)

CRITICAL RULE: Always tie the microcontroller's signal ground to the main power supply ground (Common Ground). Floating grounds will cause signal jitter or loss of control.

Power Supply Requirements & Battery Sizing

Operating Voltage Range: DC 12V to 24V (Absolute ratings: Minimum 12V, Maximum 30V).
Bench Power Supply: Regulated DC 24V with at least 10A current capacity (e.g., 24V 10A or 24V 15A switching supply).
Battery Packs:
- 4S LiPo: 14.8V nominal (~16.8V fully charged) — Ideal for compact combat robotics and lightweight platforms.
- 6S LiPo: 22.2V nominal (~25.2V fully charged) — Recommended for maximum 400 kg·cm torque output and dynamic response.
Integrated Circuit Protections:
- 5A Overcurrent Stall Protection: Automatically protects motor windings and driver MOSFETs when mechanical jams or prolonged stalls occur.
- Reverse-Polarity Protection: Prevents catastrophic board failure if DC power leads are accidentally connected in reverse.

PWM Control Signal Specifications

Signal Voltage Level: Compatible with 3.3V and 5.0V CMOS/TTL logic (Direct drive from STM32, Arduino, ESP32, Teensy, and standard RC receivers without logic level converters).
Signal Frequency: 50 Hz to 333 Hz (Standard 50 Hz RC frame period = 20ms).
Pulse Width Modes:
- Standard Mode: 1.0ms to 2.0ms pulse (Neutral center at 1.5ms).
- Extended Travel Mode: 0.5ms to 2.5ms pulse (Neutral center at 1.5ms).

In-Field Hardware Calibration (On-Board Adjustments)

The integrated controller board features built-in hardware controls for rapid in-field tuning without recompiling code:

Neutral Zero-Point Alignment (Center Trim Pot): Turn the potentiometer screw to align your mechanical neutral position perfectly with your mechanism linkage.
Operational Stroke / Travel Angle Trim: Adjust the angle trimmer to define maximum stroke limits (supports standard angular stroke up to 360° continuous rotation).
Pulse Width Selector Switch: Toggle between 0.5–2.5ms and 1.0–2.0ms operational ranges.
Direction Reversal Switch (CW / CCW): Instantly reverse rotational direction on the hardware directly without modifying receiver channel mapping or microcontroller code.

Code Example: Arduino & Microcontroller Integration

Because the DHPS380 adheres to standard PWM protocol, it interfaces seamlessly with standard libraries:

#include <Servo.h>

Servo dhps380;

void setup() {
  // Attach on pin 9 with 500us to 2500us pulse width
  dhps380.attach(9, 500, 2500);
}

void loop() {
  dhps380.write(90);  // Center position (1500us)
  delay(1000);
  dhps380.write(180); // Maximum travel
  delay(1000);
  dhps380.write(0);   // Minimum travel
  delay(1000);
}

Official Support & Technical Inquiries

For complete 3D CAD models (.STEP), detailed wiring schematics, and engineering consultation, contact the DHMCU technical team directly at dhmcu.com.