user29436: I am working with Capacitive Touch Sense technology.In that I am using TTP224 Touch detector IC. I am getting good sensitivity when I am using Touch pad without putting any non electric material over it and able to switch ON/OFF connected led.But when I put any non electric material like Acrylic Sheet of 2mm thickness I am not able to get any signal through pad or not able to ON/OFF connected led.
So, How can I increase sensitivity of Touch pad?
I have bought TTP224 module from here.
And what can be the alternatives for TTP224??? 

user4143: According to the datasheet (if you can name it that):

The capacitance Cs0~Cs3 can be used to adjust the sensitivity. The value of Cs0~Cs3 use smaller, then the sensitivity will be better. The sensitivity adjustment must according to the practical application on PCB. The range of Cs0~Cs3 value are 0~50pF. 

So, reduce the capacitances Cs0 to Cs3 and you will get better sensitivity.

user39508: Sometimes things just ****. In my case, where 0.5 mm more of gap make the TTP223 unable to work, because I designed such a small pad. My solution? Remove the paint in the PCB, put a lot of solder in to make the pad taller. Work like a charm.

user76725: remove all c3 to c10 capacitors of 22pf. This will increase sensitivity and will sense through 5 mm sheet also .

29436: <p>I am working with <code>Capacitive Touch Sense</code> technology.In that I am using <code>TTP224</code> Touch detector IC. I am getting good sensitivity when I am using Touch pad without putting any non electric material over it and able to switch ON/OFF connected led.But when I put any non electric material like <code>Acrylic Sheet</code> of <code>2mm</code> thickness I am not able to get any signal through pad or not able to ON/OFF connected led.</p>

<p>So, How can I increase sensitivity of Touch pad?</p>

<p><a href="http://www.ebay.in/itm/172493711487?aff_source=Sok-Goog" rel="nofollow noreferrer">I have bought TTP224 module from here.</a></p>

<p>And what can be the alternatives for <code>TTP224</code>??? </p>
 4143: <p>According to <a href="http://www.tontek.com.tw/download.asp?sn=373" rel="nofollow noreferrer">the datasheet</a> (if you can name it that):</p>

<blockquote>
  <p>The capacitance Cs0~Cs3 can be used to adjust the sensitivity. The value of Cs0~Cs3 use smaller, then the sensitivity will be better. The sensitivity adjustment must according to the practical application on PCB. The range of Cs0~Cs3 value are 0~50pF. </p>
</blockquote>

<p>So, reduce the capacitances Cs0 to Cs3 and you will get better sensitivity.</p>
 39508: <p>Sometimes things just ****. In my case, where 0.5 mm more of gap make the TTP223 unable to work, because I designed such a small pad. My solution? Remove the paint in the PCB, put a lot of solder in to make the pad taller. Work like a charm.</p>
 76725: <p>remove all c3 to c10 capacitors of 22pf. This will increase sensitivity and will sense through 5 mm sheet also .</p>
