bigfish312
New Member
Hi all
Im working on a project using a central locking solenoid/linear actuator (not 100% sure which) and need to be able to reverse the voltage going to it very quickly.
The project involves forcing a leaver open (when an input is given) and holding it there, allowing contents to feed into a container (timed at ~ 1/10 second), before closing the lever again (un-timed but needs to be as fast as posable). It does not need to hold the leaver closed and must power off when the cycle is compleate.
So, Triggered >> Leaver open >> Hold open for 1/10 sec >> leaver close >> power off, wait for re-trigger.
The leaver is free moving and not spring loaded, the power source at current is an 11.1v 2200mAh battery ratted at 20C. The input will be a push to make micro switch.
I need the Circuit to be as small as posable because space in the housing is limited.
Cant be made with Micro controlers/PIC's as i have no way of programming them!
The design i went with 1st:
(Not yet built or tested)
The input triggers a 555 set up for 'one shot' monostable with a logic 1 out put held high for 1/10 sec. I estimated the time taken to fully open the lever under load as being about 1/20 second (its only moving about 2cm, but to be safe i'm going to call it 1/10 sec). This out put will be connected a DPST replay to drive the 'open' action of the ever.
The second part will be a delayed 555 time going high 1/5 second AFTER the trigger input and staying high for 1/10. (this gives the circuit time to fully open, the feed action to complete before closing). the out put is then connected to a second DPST replay to drive reverse voltage to close the leaver before powering off totally until re triggered.
Problem i can for-see
I doubt the 555 timer can handle the amount of current my battery is going to kick out, is there a way of limitating this easily or is it worth running via a separate power supply (IE 9V battery).
Is there a way of wiring fets to give the same effect as a DPST relay as this will save space.
Secondly can you suggest any other circuit that will do this better than my amateurish design .
Thanks in advance for your time, Bigfish312
The
Im working on a project using a central locking solenoid/linear actuator (not 100% sure which) and need to be able to reverse the voltage going to it very quickly.
The project involves forcing a leaver open (when an input is given) and holding it there, allowing contents to feed into a container (timed at ~ 1/10 second), before closing the lever again (un-timed but needs to be as fast as posable). It does not need to hold the leaver closed and must power off when the cycle is compleate.
So, Triggered >> Leaver open >> Hold open for 1/10 sec >> leaver close >> power off, wait for re-trigger.
The leaver is free moving and not spring loaded, the power source at current is an 11.1v 2200mAh battery ratted at 20C. The input will be a push to make micro switch.
I need the Circuit to be as small as posable because space in the housing is limited.
Cant be made with Micro controlers/PIC's as i have no way of programming them!
The design i went with 1st:
(Not yet built or tested)
The input triggers a 555 set up for 'one shot' monostable with a logic 1 out put held high for 1/10 sec. I estimated the time taken to fully open the lever under load as being about 1/20 second (its only moving about 2cm, but to be safe i'm going to call it 1/10 sec). This out put will be connected a DPST replay to drive the 'open' action of the ever.
The second part will be a delayed 555 time going high 1/5 second AFTER the trigger input and staying high for 1/10. (this gives the circuit time to fully open, the feed action to complete before closing). the out put is then connected to a second DPST replay to drive reverse voltage to close the leaver before powering off totally until re triggered.
Problem i can for-see
I doubt the 555 timer can handle the amount of current my battery is going to kick out, is there a way of limitating this easily or is it worth running via a separate power supply (IE 9V battery).
Is there a way of wiring fets to give the same effect as a DPST relay as this will save space.
Secondly can you suggest any other circuit that will do this better than my amateurish design .
Thanks in advance for your time, Bigfish312
The