Atomic_Sheep
Member
Hi guys, I have a question in regards to RC servos. The battery pack for them is 4.8V 600mAh and each servo has three wires sticking out of it. (+ve), (-ve) and signal.
1.) Why is there no ground terminal? and what is the ground terminal designed to do?
2.) Given the battery pack specs, does that mean that each servo is running at 4.8 volts and 600mAh? Or does that amount decrease by a factor of the number of servos that get connected up?
3.) From what I read, the servo expects a signal every 20ms or so and the signal usually varies from 0-0.2ms, based on this and the fact that the battery is 4.8V and 600mAh what should be the amplitude of the VDC? According to the same source it should be around 3-6VDC (VDC - voltage direct current?) but how is this figure derived?
4.) Also how do you generate such a signal? Lets say the radio control joystick from a range of 0-100 is currently at 50% which means the servo should have an angle of 45 degrees (assuming a servo turns 90 degrees) then the potentiometer behind the joysticks controller is set at around 50% of its total motion also which means that... how does that 50% potentiometer setting translate into varying lengths of pulses?
Here's the thread where I got most of my info from:
https://www.rc-cam.com/servotst.htm
Please also note that just one pulse of info doesn't make the servo move the whole way, it only makes the servo move part of the way. You need a series of the same pulse in order for the servo to move to the desired location.
1.) Why is there no ground terminal? and what is the ground terminal designed to do?
2.) Given the battery pack specs, does that mean that each servo is running at 4.8 volts and 600mAh? Or does that amount decrease by a factor of the number of servos that get connected up?
3.) From what I read, the servo expects a signal every 20ms or so and the signal usually varies from 0-0.2ms, based on this and the fact that the battery is 4.8V and 600mAh what should be the amplitude of the VDC? According to the same source it should be around 3-6VDC (VDC - voltage direct current?) but how is this figure derived?
4.) Also how do you generate such a signal? Lets say the radio control joystick from a range of 0-100 is currently at 50% which means the servo should have an angle of 45 degrees (assuming a servo turns 90 degrees) then the potentiometer behind the joysticks controller is set at around 50% of its total motion also which means that... how does that 50% potentiometer setting translate into varying lengths of pulses?
Here's the thread where I got most of my info from:
https://www.rc-cam.com/servotst.htm
Please also note that just one pulse of info doesn't make the servo move the whole way, it only makes the servo move part of the way. You need a series of the same pulse in order for the servo to move to the desired location.
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