timer circuit - Page 1
Forum section: electronics / projects

author: Aria Nu Jam
author_rank: Newbie
timestamp: August 17, 2016, 02:16:20 am
content: Need help on a timer circuit design. I'm an idiot at IC design. But, I can solder.I need a timer that does this-When DC 12V power is applied to Input 1 it starts a timer (timer needs to be variable from 1 to 10 minutes) during this time DC 12V is outputted on Output 1. When timer completes no voltage output on Output 1.Note- Power will continue to be applied to Input 1 after the timer completes.Application -> when water flows through a Magnetic Water Flow Switch the circuit is closed that switch & voltage from a battery is connected to Input 1. When water starts flowing through the pipe I want the timer to start which applies voltage to a flow control valve which opens a valve.Whats happening is water is flowing into a water storage area which gets dirty very frequently. There is a drain on the bottom of the water storage container. So water starts going into the water storage area the drain valve opens and basically clears out the dirt. After a few minutes the storage area is clean the drain valve closes and water continues to flow until it's full.If someone can help me with the design or point me to the design schematic somewhere on the internet that would be very helpful.Thanks

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: August 17, 2016, 03:03:26 am
content: 1)http://www.ebay.ca/itm/DC-12V-Multifunction-Self-lock-Relay-PLC-Cycle-Timer-Module-Delay-Time-Switch-/271958222133?hash=item3f51f92535:g:bEcAAOSwsTxXjEXG2) Wait for mailman.

author: Aria Nu Jam
author_rank: Newbie
timestamp: August 17, 2016, 10:19:58 pm
content: Alex-I like that idea.Please do me a favor and confirm this sounds like the correct Function for my needs...[Function 12]Trigger timing mode B?the relay does not operate after power on ,give IN1 interfacea low pulse signal, the relay pull-in , when arrived the timing time T1, the relaydisconnect,T1 can be adjustable between 0.1 second -270 hours, give IN1 interfacea low pulse signal again, repeat the above function one time.It's asking for a low pulse signal on IN1 - How would I go about doing that? The Input signal that I'm working with is either on or off.

author: Aria Nu Jam
author_rank: Newbie
timestamp: August 18, 2016, 01:06:04 am
content: Actually after I read through the functions list a few times I think Function 2 is what I need. Don't you think....[Function 2]?Timing Disconnect?after power on the relay pull-in, when arrived the setting timeT1,the relay disconnect, and the T1 can be adjustable between 0.1 second -270 hours,give IN1 interface a low pulse signal(low level duration?20ms),repeat the abovefunction.Thanks,Aria

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: August 19, 2016, 01:19:01 am
content: Yeah, it's not clear. But the great thing with this cheap stuff is even if it doesn't work, you still have a PCB and some parts to play with. I think you just buy it and play with it.Function 4:Timing and then pull off: After power, immediately pull the relay, the relay off delay time T1 after arrival; T2 arrive after disconnecting time relay, -270 hour in 0.1 seconds delay time between T1 and T2 adjustable to CH1 interface a low pulse signal, repeat the above functions;Apply power, I guess the NO contact closes for delay time, then it opens and stays open.Half the fun with this stuff is translating the english.

author: Ammar
author_rank: Regular Contributor
timestamp: August 19, 2016, 08:18:03 am
content: Google 555 timer in monostable mode. Use the sensor to trigger a single shot and drive a relay using the output.