I am very new to electronics and Robots. I have been trying to run a continous servo motor 4v to 6v. I have a battery power source of 9v.
I have the following question.
Since my power source is higher than my required voltage I wanted to use a resistor to lower the voltage, so my motor is not going to get damaged. I used the following formula to find out the resistor required to get this voltage.
R = (Vin - Vout)/current required
which is
(9-6)/.01 = 300 ohm
Since I didn't have a 300 ohm resistor I used a 330 ohm resistor.
When I connected the circuit without the motor an checked the voltage across the circuit with the resistor on, it gave me a reading of 8.90v. I was not very sure what was going on, so I went on to connect my servo motor to see if it works by passing the signal and voltage. To my surprise the motor didn't work. So checked the voltage across the circuit it was reading 2v.
I was a bit confused at this point, so I removed the resistor from the circuit and connected the servo motor straight to the 9v power supply and the motor started working.
Please can any of you tell me, if I am doing something wrong here. Why the motor didn't work with connecting to resistor Or do let me know if I have done something wrong with the calculations.
You state “continous servo motor”. Can you supply the part identification info? Is it a modified hobby servo? Most hobby servos require a 4-6V power and a pulse every 20msec. The pulse width determines the rotation angle.
Will check with Voltage regulators and Rectifier Diodes
Hi All,
Thanks for your response and guidance.
I missed to mention the servo motor that I am using is FITEC FS5106R motor which probably requires a current input 100mA. So I got it wrong with the calculation.
Also I will try to get a voltage regulator and rectifier diodes to see which one fits me well.
I checked on google and this I checked on google and this is your basic servo either modded or changed at the factory for continuous rotation. Therefore I would estimate 1 amp+ for current usage.
This motor needs a control pulse to move. You need 4.8 - 6.0V DC with enough current to move the load. If you are just seeing if the motor rotates do not attach wheels for testing. Again, just appling 4.8 - 6.0V DC power will do nothing!!!
Generating signals every 20ms, with1.5ms high time,the servo will stop move, if not, please changing the 0-Point setting of the servo let it stop to move. After that, Generating signals every 20ms, with1.0ms high time,the servo will move CW rotation. Generating signals every 20ms, with2.0ms high time,the servo will move CCW rotation.
