1 3

Servo Adapter

Servo Adapter

AX22-0031

Need to plug in hobby servos without turning your AX22 build into a wiring octopus? This board does the trick. It brings three 3-pin male headers (Signal / Vin / GND) out to the edge of the 22 × 22 mm footprint so standard female RC-servo leads snap straight on no breadboards, no loose jumpers. Because AX22 Vin is only 3.3V an additional power screw headers are provided so you can provide independent motor power. However, if you insist on 3.3V you need to solder one jumper pad. Drop it into any AX22 backplane and power three servos (or ESCs, LEDs, etc.) from one neat, protected hub ideal for walkers, gimbals, pan-tilts, or animatronics controlled from Arduino IDE, MicroPython, or MicroBlocks.
$3.49
$3.49
Sale Sold out
View full details

Technical Details

  • - 22 mm × 22 mm square
    - 4× ⌀2.7 mm Mounting Holes
    - Power provided externally or through pins (requires solder bridge).
    - 1.8 V, 3.3 V, 5.0 V
    - Pin order matches standard RC-servo cables
    - Headers spaced for easy simultaneous access
    - Arduino IDE Compatible
    - MicroPython Compatible
    - MicroBlocks Compatible

    Material Datasheet 

Pinout

Technical Resources

Servo Adapter - (AX22-0031)
Circuit Schematic 3D Model

PCB FRONT

PCB BACK

🟢 Live 3D Model

🖱️ Click & drag to rotate

Arduino Example Snippet 

#define SERVO1_PIN 1
#define SERVO2_PIN 14
#define SERVO3_PIN 41

#define SERVO_FREQ_HZ 50
#define PWM_BITS      12
#define PWM_MAX       ((1 << PWM_BITS) - 1)

// Typical servo pulse range (adjust if needed)
#define SERVO_MIN_US  500
#define SERVO_MAX_US  2500

static inline int clampi(int v, int lo, int hi) {
  if (v < lo) return lo;
  if (v > hi) return hi;
  return v;
}

static inline int angleToUs(int angle) {
  angle = clampi(angle, 0, 180);
  long us = SERVO_MIN_US + (long)(SERVO_MAX_US - SERVO_MIN_US) * angle / 180;
  return (int)us;
}

static inline int usToDuty(int us) {
  // 50 Hz -> period 20,000 us
  const int period_us = 1000000 / SERVO_FREQ_HZ; // 20000
  long duty = (long)us * PWM_MAX / period_us;
  return (int)clampi((int)duty, 0, PWM_MAX);
}

static inline void servoWriteAngle(int pin, int angle) {
  int us = angleToUs(angle);
  int duty = usToDuty(us);
  analogWrite(pin, duty);
}

void setup() {
  pinMode(SERVO1_PIN, OUTPUT);
  pinMode(SERVO2_PIN, OUTPUT);
  pinMode(SERVO3_PIN, OUTPUT);

  // IMPORTANT: core 3.3.5 requires pin argument
  analogWriteFrequency(SERVO1_PIN, SERVO_FREQ_HZ);
  analogWriteFrequency(SERVO2_PIN, SERVO_FREQ_HZ);
  analogWriteFrequency(SERVO3_PIN, SERVO_FREQ_HZ);

  analogWriteResolution(SERVO1_PIN, PWM_BITS);
  analogWriteResolution(SERVO2_PIN, PWM_BITS);
  analogWriteResolution(SERVO3_PIN, PWM_BITS);
}

void loop() {
  for (int a = 0; a <= 180; a++) {
    servoWriteAngle(SERVO1_PIN, a);
    servoWriteAngle(SERVO2_PIN, a);
    servoWriteAngle(SERVO3_PIN, a);
    delay(15);
  }

  for (int a = 180; a >= 0; a--) {
    servoWriteAngle(SERVO1_PIN, a);
    servoWriteAngle(SERVO2_PIN, a);
    servoWriteAngle(SERVO3_PIN, a);
    delay(15);
  }
}