How to delay alarm triggered by Hall magnetic sensor

Thread Starter

ajghor

Joined Jan 7, 2021
11
Hi guys,

As we are always struggling with our refrigerator door left open I was searching the net for a solution and found a modification of a door/window alarm on Maker Corner which uses the reed switch. It was a really simple modification with a capacitor and two resistors to delay the alarm and turn the volume down. So, I bought the alarm only to found out it's a new version with a hal magnetic sensor.
It is a 6207 hal sensor connected to the yl3710 IC

My question is: is there a simple way to delay the alarm as with the reed switch?
I have attached a pic of the alarm.

Thx.
 

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Thread Starter

ajghor

Joined Jan 7, 2021
11
Same idea, find the trigger pin and put a capacitor on it to delay it.
Hi Dave,

Thanks for your fast answer.
I did try it but without success :-(
Obviously I did something wrong.
The trigger pin should be the middle one on the 6207. So I should connect the capacitor + on the trigger line and - to the ground.
Am I correct?
 

Dodgydave

Joined Jun 22, 2012
9,848
Hi Dave,

Thanks for your fast answer.
I did try it but without success :-(
Obviously I did something wrong.
The trigger pin should be the middle one on the 6207. So I should connect the capacitor + on the trigger line and - to the ground.
Am I correct?
Which middle , there are 8pins!!

I've tried to search on Google, but it comes up with various circuit diagrams without pin mums.
 

Thread Starter

ajghor

Joined Jan 7, 2021
11
Can't believe this. Not a single diode in my case of electronic goodies!
And currently I am cut out of the rest of the world because of the snow. Aaaaaargh!
I know there is a lot of difference between a diode and a led, but could it be used in this case?
 

Thread Starter

ajghor

Joined Jan 7, 2021
11
Well, I have finally managed to solder everything, but it just kinda works.
I've got a delay of about 5 secs, but the problem is that when I bring the magnet back the alarm doesn't stop, it just keep playing, so I have to switch it off by myself.
I did manage to pull the trace of the board in my clumsy soldering, but it seems to still have a good contact with the hall.
I do have another door/window alarm, but would like to keep it for the final version.
Could the diode version help?
 
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