truck gate

**Melros** · - 11th October 2007, 18:31

Hi i am a newbee

can someone help me

The problem.

I have a big gate that i want to open and close true a radio controller thats only have one button. It`s one switch at the top and one at the bottom of the gate to tell when the gate is open or closed.. If you puch the button and the gate is down the gate must go up and, and down when the gate is at the topp.
But when the port is going down and you puch the button the port stops, and if you puch it again it`s going up and reverse.

if someone can make a simple program to me i wil be so happy.

**Ioannis** · - 11th October 2007, 20:14

If I get it right, you have two non-compatible systems to interface through a PIC based circuit without any experience and without any feedback from the gate door...

I think you have to start with the classic LED flasher example and then write something more complicated and IF is not working then come here to show what you have done. Then we can offer all the help to you.

But the case here is not so easy as you think. You can't be sure when the door is open or close. So you can not give the appropriate command. There are solutions ready made for this kind of gates with the security it needs. I do this for living and for sure is not for novice!

Ioannis

**chuck** · - 11th October 2007, 20:29

The cheek of some people :-)

First post and bang straight in

How much do you want to pay for code ? :-))

**Melros** · - 11th October 2007, 20:50

The program i made is like this, but now it goes down when the gate have stoped.

trisb = %00001111
portb = 0

main:
pause 500
if portb.0 = 1 and portb.7 = 1 then 'portb.7 switch top'
goto down 'portb.0 is the sender-
endif
if portb.0 = 1 and portb.6 = 1 then 'portb.6 switch buttom'
goto up
endif
if portb.0 = 1 and portb.7 = 0 and portb.6 = 0 then
goto down
endif
goto main

down:
pause 500
portc.0 = 1 'c0 sends the port down,
if portb.0 = 1 then
goto stopp
if portb.6 = 1 then
portc.0 = 0
goto main
endif

up:
pause 500
portc.1 = 1 'c1 sends the port up'
if portb.0 = 1 then
goto stopp
endif
if portb.7 = 1 then
portc.1 = 0
goto main
endif

stopp:
portc.0 = 0
portc.1 = 0
if portb.0 = 1 then
goto main
endif
end

**Ioannis** · - 11th October 2007, 21:36

Yes it will go down or up instead of where you want to. I explained why. You can't expect synchonization that way. You will never know where the gate is every time.

Ioannis

**mackrackit** · - 11th October 2007, 22:26

I can think of three options.

This is all happening between the top and bottom switch.

1 - Remember direction of travel:
If the gate is going down, write a value to a variable or EEPROM so the after you stop the gate , the next time the button is pushed, read the stored value and have that value equal down. Use the same method but a different value for up.

2 - Toggle reverse/start/stop:
If the gate is in motion - push button to stop - remember the direction of travel. Push button again and the gate reverses.. If not going the way you want it to push the button two more times.

3 - GET ANOTHER BUTTON!

**Ioannis** · - 12th October 2007, 10:45

What about power failure?

Ioannis

**Melanie** · - 12th October 2007, 11:30

Geeze... a problem summarised in one short paragraph. The last one that landed on my desk was 27 pages deep...

So, you have a 1 Button Remote, to control a 2 Button application.

Press the Button momentarilly and the Gate goes UP. This means that for safety in an emergency it goes UP if you hit it.

If the Gate is already in motion (in any direction) when it receives a Button press, it STOPS.

Press the Button and HOLD it for at least 3 Seconds before releasing and the Gate goes DOWN.

If it's a Prison Gate, just reverse the priority...

30 seconds, done and dusted... and the next problem...