Stretch your mind.
After all the recent power failures, I have a couple customers wanting notification of power issues.
Pretty easy, battery backed text dialler, sends a text message when 0v applied.
Use a 240v relay, it drops out, it applies 0v.
Use a multifunction timer to insert a delay.
I'm struggling to design a simple circuit that will insert a delay on failure and restore.
I want to use two trigger inputs, one to trigger a fail message, one a restore. Both delayed.
You can apply and leave 0v on the dialler, it doesn't need to be pulsed. Apply and leave it, dialler texts. It won't text again until signal removed and reapplied.
Sounds simple.
Its not! When the 240v relay looses power, you need to delay release of the 0v on the restore trigger, when it is re-energised, you need to delay reapplying the 0v trigger. I think I can do this with a latching relay.
Can't draw it at the mo.
Anyone see an obviously easy method?
After all the recent power failures, I have a couple customers wanting notification of power issues.
Pretty easy, battery backed text dialler, sends a text message when 0v applied.
Use a 240v relay, it drops out, it applies 0v.
Use a multifunction timer to insert a delay.
I'm struggling to design a simple circuit that will insert a delay on failure and restore.
I want to use two trigger inputs, one to trigger a fail message, one a restore. Both delayed.
You can apply and leave 0v on the dialler, it doesn't need to be pulsed. Apply and leave it, dialler texts. It won't text again until signal removed and reapplied.
Sounds simple.
Its not! When the 240v relay looses power, you need to delay release of the 0v on the restore trigger, when it is re-energised, you need to delay reapplying the 0v trigger. I think I can do this with a latching relay.
Can't draw it at the mo.
Anyone see an obviously easy method?