Servo Motor Controller mini project

This is the simple basic design of Servo pulse generator. It uses the CMOS IC 7555 in the Astable mode to generate pulses to drive the servo motor. The circuit can be suitably modified to get pulses of sufficient length. A Servo is a small device that has an output shaft. This shaft can be

positioned to specific angular positions by sending the servo a coded signal. As long

as the coded signal exists on the input line, the servo will maintain the angular

position of the shaft. The angular position of the shaft is determined by the duration

of a pulse that is applied to the control wire. This is called Pulse Coded Modulation.

The servo typically requires pulse every 20 milliseconds (.02 seconds). The

length of the pulse will determine how far the motor turns. Generally, 1.5

millisecond pulse will make the motor turn to the 90 degree position. This is called

the Neutral Position. If the pulse is shorter than 1.5 ms, the motor will turn the shaft

to close to 0 degrees. If the pulse is longer than 1.5ms, the shaft turns closer to 180

degrees.

M7555Datasheet

The circuit is designed to give control signals to the Servo.IC1 is designed as an

Astable multi vibrator which can give pulses for the operation of the Servo. The

10KPot VR2, R1 and capacitor C1 determines the High and Low time of pulses. Since

VR2 is variable, High time varies from 2.07 mS to 1.03 mS. The low time will be 40.5

mS. By adjusting VR1, it is easy to get exact timing.VR3 adjust the control voltage of

1.6 volts to the control pin 5 of IC1.

Servo Motor:

A control voltage can also be supplied from outside. Then VR3 should be omitted.

The control volt can be provided from a variable power supply that gives output of 0-

10 volts. The control voltage will control the position of the servo motor connected

to the output. When the control voltage changes, the servo will move to the new

position corresponding to the new control voltage value. 0 volt causes the servo to

remain at one end and 10 volts to other end. If the control volt is 5 volts the servo

remains in the center position.

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Posted by creativeworld9 at 3:53 AM Labels, B.TECH MINI PROJECTS, Controllers AND Sensors based MINI PROJECTS, ece/eee mini projects, mini project on Servo Motor Controller, Servo Motor Controller project, servo motor roject

1 comments:

D.Mohankumar said...

Please give the name author and link in the circuit

It is my contribution to electroschematics.comhttp://dmohankumar.wordpress.com/circuits-in-electroschematics/

October 2, 2012 12:35 AM

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Emergency Light

This is an LDR based Emergency Lamp that turns on a High watt White LED when there is darkness in the room. It can be used as a simple emergency lamp in the child’s room to avoid the panic situation in the event a sudden power failure.It gives ample light in the room.

The circuit is too simple so that it can be enclosed in a small box. A 12 volt miniature battery is used to power the circuit. Two transistors T1 and T2

are used as electronic switches to turn on / off the white LED. When there is sufficient light in the room, LDR conducts so that the base of the PNP transistor T1becomes high and it remains off. T2 also remains off since its base is grounded. In this state, White LED remains off. When the light falling on the LDR decreases, it cease to conduct and T1 forward bias providing base current to T2. It then turns on and White LED switches on.White LED used in the circuit is 1 watt High bright Luxeon LED . Since 1 watt White LED consumes

around 300 milli ampere current, it is better to switch off the lamp after few minutes to conserve battery power