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What battery is suitable

I will use 2 DC motors (4-6v, 250mha) + 1 servo (6v) with Arduino uno + driver shield. I don't know which battery I can use. Some tell me 12v others tell me 9v. Can anyone tell me which voltage and ...
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How to PID loop Tuning for the system which step response is Oscillating about set point

I am using PID controller to stabilise the two DC motor response using encoder signals. DC motor is controlled by Driver with the analog signal. I am using PID closed loop to run the DC motor at fixed ...
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How can I limit the current sent to my 6V servos to ensure they don't burn out?

I'm using an adjustable desktop power supply (0-30 volt DC, 0-10 amp) to power my robot which has 7 standard 6-volt servos. There are some situations where the robot gets jammed, and power draw ...