# Touch (knock) sensor with Piezo

##### If you want to make a simple touch sensor but you don't have the fancy ones around you can also use a piezo element, which come with a lot of basic arduino starter sets.  


What you need:

<table border="1" id="bkmrk-piezo-element-breadb" style="border-collapse: collapse; width: 100%;"><colgroup><col style="width: 33.3333%;"></col><col style="width: 33.3333%;"></col><col style="width: 33.3333%;"></col></colgroup><tbody><tr><td>piezo element

<div>![](https://cdn-reichelt.de/bilder/web/artikel_ws/B400%2FEKULIT-190051.jpg?type=Product&)</div></td><td>breadboard <div>![](https://image.allekabels.nl/image/1446011-0/breadboard-afmetingen-81-x-55-x-8mm.jpg) </div></td><td>resistor 1 M ohm

  
![](https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTBA4twFjVplLxCILOemIsr5NFGbJQkJYWiRA&s)

</td></tr><tr><td><div class="Ter3Ue">piece of paper tape</div><div class="Ter3Ue">  
</div><div class="Ter3Ue">![](https://encrypted-tbn2.gstatic.com/shopping?q=tbn:ANd9GcRQQMlNLQViZ2PP1b8sfp-hSPZUXq4crtlXjPWlL6NVMVDzglMaPLBn3jHA5zJfmCBD8wS55BpYr2IThg77X8QI9b-zlTjYz-PHjaxb4bZ6jDsrj37qDzrK1Ltsos9aeEQJR1HhIg&usqp=CAc)</div></td><td><div>some male/male jumper wires</div>![](https://encrypted-tbn2.gstatic.com/shopping?q=tbn:ANd9GcSBPh7Pdrv9ODMqSLMjVMXjsrnEr44W8WcgVTxxpNXgNYWl6bRWmAiOn_d1w7idwAqiv7Y4kXLzIkOpDRhRsv736tAhMfrBj8Lf2lrDfzwuhcGQKTV_f1MKFQ)</td><td>  
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##### This video explains it all. To make the input visual, open the serial Monitor from the Tools menu.

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