SK40c voltage drop problem.

[A.Palaniappen]

Dear sir,
Recently i bought SK40C and 3 C40S servo motors for my final year project.I have a question??When I connect my servo motor to SK40C, servo getting 5V from SK40C board i got found some problem that's make the servo motor stopped from working.what happens is the 5v on sk40c board drop to 2.67v?? sumthing.Eventhough the battery power is 12v.i dont know exactly about the problem.
Can you please tell me why does this happen and what is the way to rectify it!!

Your help is highly appreciated.

Thank you very much
A.PALANIAPPEN
Mechatronic student.

[shahrul]

Make sure you supply 5V servo from external source, not from SK40C. Because voltage regulator on SK40C can't supply high current. I think it can support less than 1A or 0.5A.

[robosang]

Yup, shahrul is right, the regulator on SK40C cannot supply much current, rated at 1A maximum, typical is only 500mA. The servo motor can easily can draw 1 to 2A each, so when you connect 3, can you imaging ?? When the current is not sufficient, voltage will automatic drop, just like what happen on power supply in your laboratory.

[A.Palaniappen]

Dear sir
I try ready by using external source but its still x work because of the different grounding and one more i need to know your opinion ,one of my friend suggest me to use SC08A SERVO CONTROLLER.As he sed SC08A can run 8 servo motors at a time.Any Comment.

[shahrul]

Dear sir
I try ready by using external source but its still x work because of the different grounding and one more i need to know your opinion ,one of my friend suggest me to use SC08A SERVO CONTROLLER.As he sed SC08A can run 8 servo motors at a time.Any Comment.

You need to share same ground between 2 sources. Also same with using SC08A, you also need to share same ground between PIC and Servo Controller.
This 2 example of servo motor
1. Servo Motor
2. Servo Controller

[robosang]

Yes, SC08A is easier to control RC servo, but your problem is not only control, your problem is due to power Even if you use SC08A you will still need to supply power to servo. The GND must be common, this is the very basic of electronics!