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Bypass touch "button"

Crazy323

New Member
Hello, sorry for my bad English but I need some help on this...

So I have a controller board from a humidifier and I want to make him smart, so I'm adding a "smart switch"

( https://a.aliexpress.com/_EyQEmC5)

This can send a pulse for 0.5s, just like the Touch of a finger, but I can't figure on the board were i should sold the 2 wires that will make the "pass"

I let u guys some pics of the board, if u can help me
20230122_195019.jpg
20230122_195058.jpg
 

rjenkinsgb

Well-Known Member
Most Helpful Member
Does the humidifier have a touch switch, or a momentary pushbutton, for power?

If so, which connector on the PCB does it connect to?
 

rjenkinsgb

Well-Known Member
Most Helpful Member
Try touching a wire short bit of wire from either the 0V (centre of 78L05) or 5V (top pin of 78L05) to the sensor terminal?

One or the other will hopefully be seen as a touch trigger.

Use a bit of thin insulated wire so holding it does not trigger the sensor.

Touch_control_mod.jpg
 

Crazy323

New Member
I've tried and it works perfectly, the sensor with the OV trigger the PCB on, tnks so much for the help, I was just wondering if e could get a "power supply" of 5V to power the smart switch, because it works at 5v and this board I can only read 12v on it

Sorry for the bother but I'm really newbie at this, but I like this
 

Crazy323

New Member
Try touching a wire short bit of wire from either the 0V (centre of 78L05) or 5V (top pin of 78L05) to the sensor terminal?

One or the other will hopefully be seen as a touch trigger.

Use a bit of thin insulated wire so holding it does not trigger the sensor.

View attachment 140065
I've tried and it works perfectly, the sensor with the OV trigger the PCB on, tnks so much for the help, I was just wondering if e could get a "power supply" of 5V to power the smart switch, because it works at 5v and this board I can only read 12v on it



Sorry for the bother but I'm really newbie at this, but I like this
 

rjenkinsgb

Well-Known Member
Most Helpful Member
The top pin of the 78L05 should be 5V, however it will not be able to provide much current, possibly 100mA maximum.
You could try it; if the 78L05 gets uncomfortably hot, it's too much for it.
 

Crazy323

New Member
The top pin of the 78L05 should be 5V, however it will not be able to provide much current, possibly 100mA maximum.
You could try it; if the 78L05 gets uncomfortably hot, it's too much for

Thank you so much for the help

So let me just see if I understand, I try the positive 5v from the top pin of 78L05 and for the negative should I use the 12v line?
 

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