1 2

Servo Adapter (Internal Power)

Servo Adapter (Internal Power)

AX22-0043

Need to plug in hobby servos without turning your AX22 build into a wiring octopus? This board brings three standard 3-pin male headers (Signal / Vin / GND) out to the edge of the 22 × 22 mm footprint, so female RC-servo leads plug straight in with no breadboards or loose jumpers.

Servo power is taken directly from the AX22 Vin pins, so there’s no separate power input, screw terminal, or jumper to configure. Drop it into any AX22 backplane and connect up to three servos, ESCs, LEDs, or other compatible 3-wire devices from one compact hub, useful for walkers, gimbals, pan-tilts, animatronics, and other motion-based builds 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 through the Vin pin
- Pin order matches standard RC-servo cables
- Headers spaced for easy simultaneous access
- Arduino IDE Compatible
- MicroPython Compatible
- MicroBlocks Compatible

Pinout

Technical Resources

Servo Adapter (Internal Power) - (AX22-0043)
Circuit Schematic 3D Model

PCB FRONT

PCB BACK

🖱️ 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);
  }
}