Servo Monitor


This tool allows you to easily check servo vitals. Just plug a servo controller into one side and a servo into the other. The screen will display the value for the selected mode in real-time. Press the pushbutton to cycle through the four modes.


  • Pulse Width
    In this mode the Servo Monitor will display the width of the pulse of the signal being sent to the servo. This value is displayed in microseconds (μsec). This is the core of how servos are controlled. This value is what the servo looks at to determine where to rotate to (or for continuous rotation servos, what speed and direction to achieve). Knowing what value is being sent to the servo can be very valuable. For example you can determine what PWM range your transmitter is sending or confirm that code you wrote for your Arduino is working correctly.

  • Pulse Frequency
    In this mode the Servo Monitor will display the frequency of the Pulse Width Modulation Signal. This value is displayed in hertz (how many pulses per second). This is generally a less critical value than the pulse width but can still be useful in troubleshooting.

  • Voltage
    As the name implies this mode will display the voltage being sent to the servo. This wire is used to supply power to the motor within the servo. Sending the correct voltage to a servo is important. Seeing this can help determine if you are sending too high of a voltage or just help you keep an eye on the battery's charge level.

  • Current
    In this mode the Servo Monitor will display current in amps. This can give you an indication of how hard the servo is working to maintain position. You can never have too much potential current in your battery. For example, a battery with a million mAh rating will not burn out your servo, it will just run the servo for a very long time between charges. However a battery which cannot supply enough current will not allow your servo to live up to its strength and speed potential.  


Weight 10g
Input Voltage Range 5-15 VDC
Current Drain 20mA
Pass through Current Max 10A
PWM Range 0 - 3200 μsec
Frequency Range 1-1000Hz
Current Sensing Accuracy ±5%
Voltage Sensing Accuracy ±5%
Pulse Width Sensing Accuracy ±1%
Frequency Sensing Accuracy ±1%
Version 1.0

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