linear actuator project

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hello im an engineering student ! i would like to ask a help to program a MikroC to control the output of the linear actuator. the lenght of the output..
 

in a project a few years ago with a linear actuator we used a PIC24FJ128GA010 but any microcontroller would do. The interface was
1. digital output to relay to operate actuator (actuator current was > 20amps)
2. digital output forward/reverse actuator
3. analogue input from a ACS712 current sensor to check operating current
**broken link removed**
4. digital input from actuator fuse - to check if fuse had tripped
 

Are you talking about a linear actuator that is 2cm x 2cm x 3cm ???
 

ser i want code in mikro c using the pic16f877a.please!!

were going to use a relay to make it forward and reverse.. the actuator lenght about 12 inches
the problem is that we dont have codes to make the relay trif off when it hits the exact lenght of it
 

You have to use POWER transistor or mosfet LIKE irf840. With relay there will be a delay in turning ON and OFF. It will be difficult to get precise movement using relay.

Provide datasheet of your Linear Actuator. You will need Bi-directional motion without reversing the power supply. How much length it moves for 1 second pulse ?

Better use H-Bridge to reverse the directions. Mention the current rating of your actuator.
 
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the on/ooff and forward/reverse relays can be connected to digital outputs
does the actuator have sensors to determine when it reaches its limits ?
if so you can connect these to digital inputs
in our application the actuator was crushing solid material in a tube until it turned liquid - the actutaor stoped and reversed when the ACS712 sensor indicated s set current had been reached

are you using a PIC16 development board or have you built your own PCB?
 

i use PIC16f877a. ser.. the lenght of the linear actuator is 12 and the extended lenght also is 12 inch.. maybe we can make the time of the relay triff off at a give time

if i connect the linear actuator to positive to negative it moves forward. but when i swap the terminals it go backward.
 

i use PIC16f877a. ser.. the lenght of the linear actuator is 12 and the extended lenght also is 12 inch.. maybe we can make the time of the relay triff off at a give time

if i connect the linear actuator to positive to negative it moves forward. but when i swap the terminals it go backward.
 

You have to tell us what you want to control with the actuator.
And let us know the cost and how often you want the actuator to operate.
Most actuators are "screw jacks" and have a very limited life.
They are also very expensive.
You can use limit-switches to control the actuation or current detection.
Or you can build a micro-miniature model with an actuator and microcontroller for less than $20.00
 

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