DSS-M15S 270 15KG DF Metal Servo with Analog Feedback SKU: SER0044 DSS-M15S servos have been well received by customers in these years. It has extremely wide angle control range, huge load capacity and excellent quality. This DSSM15S with analog feedback has broken its internal potentiometer signal. This is an analog signal with 0~3.3V feedback. You can connect it to MCU to realize close-loop feedback control. DSS-M15S 270 Metal servo with feedback is compatible with Arduino Servo library. You can drive it with Arduino Board and read the angle value from analog side. Specification * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Electronic specifications Operating voltage: 4.8-7.2V 6V test environment Operating speed (no load): 0.18 sec/60 degrees Resting current: 80mA Locking torque: 13.5KG*cm Stall current: 1.8A Standby current: 4mA 7V test environment Operating speed (no load): 0.16sec/60 degrees Resting current: 100mA Locking torque: 15KG*cm Stall current: 2A Standby current: 5mA Mechanical specifications Gear material: metal gear Operating angle: 270 degrees Wiring gauge: 28PVC Data line length: 320mm Gear bracket spline: 25T/5.80 Gear ratio: 310:1 Size: 54.5*20*47.5mm Control specifications Feedback signal: 0-3.3V Control signal: RC PWM Pulse range: 500-2500 us Median signal value: 1500us Clockwise rotation: <1500us Control frequency: 50-330Hz (Arduion compatible) Servo Overview DSS-M15S 270 15KG DF Metal Servo with Analog Feedback Num Label Description 1 GND GND 2 VCC 4.8~7.2V 3 INPUT PPM Signal 4 OUTPUT Analog feedback Relationship between Angle & Analog value SER0044 Servo Formula: Actual angle = Analog value degree *0.47-33.4 Before Usage There will be some error between each servos. If you want to use the servos with scenes that require precise control, you can calibrate them separately. A quick three-point calibration method is provided here: * * * 1. Drive the servo to 90 degrees (1500us), record the actual angle as reference angle A, and record the corresponding feedback analog value a; 2. Drive the servo to 0 degrees (500us), record the actual angle as reference angle B, and record the corresponding feedback analog value B: 3. Drive the servo to 270 degrees (2500c), record the actual angle as reference angle C, and record the corresponding feedback analog value C The following formula gives the relationship between Analog value & Angle: * * * Actual angle = m * Analog value + n m=[(A-B)/(a-b)+(C-A)/(c-a)]/2 n=[(Ab-Ba)/(b-a)+(Bc-Cb)/(c-b)]/2 If you doesn't need such accurate value, you can use m=0.47;n=-33.4 directly. Tutorial Requirements * * * * Hardware DFRduino UNO R3 (or similar) x 1 SER0044 DSS-M15S 270 Metal Servo M-M/F-M/F-F Jumper wires * * Software Arduino IDE, Click to Download Arduino IDE from Arduino(R) Connection Diagram SER0044 Arduino Connection Sample Code void setup() { Serial.begin(9600);//Set Baud Rate to 9600 bps } void loop() { uint16_t val; double dat; val=analogRead(A0);//Connect Analog pin to A0 dat = (double) val * 0.47-33.4; Serial.print("Position:"); //Display the position on Serial monitor Serial.print(dat); Serial.println("Degree"); delay(100); } Expected Results Arduino will drive the servo with D9 pin, and receive the Analog feedback from A0 port. Dimension SER0044 Dimension https://www.dfrobot.com/wiki/index.php/DSS-M15S_270%C2%B0_15KG_DF_Metal_Servo_with_Analog_Feedback_SKU:_SER0044 5-3-18