Can anyone give me advice on touch sensor to implement my IOT project?

I used this part to touch button remotely.

I did it to my phone, but not to my LG - puricare or air conditioner's touch sensor button.

Can anyone guess why in my phone works, but not my LG puricare and air conditioner?

Maybe you can start by telling us with it IS you are attempting to use? With a link to where you got it and datasheet?

Next post the specs of your phone.. and the other products you are trying to use?

Maybe different screens or tech used? capacitive? resistive?

sorry for lack of information

the parts that I use is linked below.

phone is just normal smartphone and I thought If I can do touch in smartphone it would be working on other device that use touch button.

Hi,

kotran:
phone is just normal smartphone and I thought If I can do touch in smartphone it would be working on other device that use touch button.

There are many different types of 'touch sensor' which use different ways of sensing a finger touch.

Using that relay board, it just connects the pad on the bottom to the GND of the Arduino.
So it depends what the GND of the arduino is connected to. It will be different for each of these cases for example:

a. Arduino powered from a 5V USB supply plugged in the mains
b. Arduino powered from a laptop
c. Arduino running from a battery pack
d. Arduino running from a battery pack while you are holding it

It is quite possible that although it works on your phone, it might stop working if you had the Arduino running from a battery pack with just the phone and arduino laid on a table top. It might then start working if you touched the Arduino USB socket (because your body is then connected to the Arduino GND).

As a wild guess at something you could try... cut a 1 inch square of aluminium foil and put that over one of your other touch buttons and put the relay thing on top. It might just make it "look bigger" to the touch sensor. Chance in a million tho'

Yours,
TonyWilk