Servo motor and DC motor control using IC 555

Here we will understand how to control speed and direction of DC motor and how to control Servo motor.

         It is easy to connect the DC motor to battery and rotate it in a particular direction. But it is tough work to control the speed of motor controlling and rotation of servo motor. But now no problem because I am giving u some controlling circuit to control the dc motor speed and Servo motor .

DC motor :- This DC motor is connected 555 Ic directly .If we use other motor then there are required a 2N2222 transistor between ic and motor.      IC 555:- 555 timer  is very famous  ic to generate PWM signal in Astable mode . On time an Off  time of PWM is decided by the  given formula

Ton = 0.693 x (R1+R2) x C

Toff = 0.693 x R2 x C

On and off time decide the duty cycle of PWM which decide power given to the motor and power sets the motor speed.

%duty cycle =Ton / (Ton + Toff) x 100

Power calculation:-

If V(t) is the output voltage of 555 IC then

DC motor speed control circuit diagram:- Astable multivibrator is used to generate the PWM and it is control by varying pot resistor R2. 

  DC motor direction control circuit diagram:- you must onnect 9v or 12v supply.

Servo motor:-This motor has three wire

1) Vcc

2) Signal

3) GND

PWM(Pulse width modulation ) signal is give it to the signal pin. According to the PWM direction of servo motor given bellow

Servo motor circuit diagram:- Most of the time there are problem occur in  controlling servo then 1A charger must be used across servo supply.

Other link:-

.  Servo motor

. Servo controller