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TTP223 Capacitive Touch Sensor PCB
Here is a simple capacitive touch switch circuit for electronics hobbyists. Even though the circuit uses smd components, construction of the touch sensor switch is not very hard because the whole circuit can be easily fabricated on a piece of smd prototyping board. At the heart of the circuit is an inexpensive (`20) smd chip TTP223 commonly available in BA-6 package. The TTP223 is a touch pad detector IC which offers one touch key, designed for replacing traditional direct key button switch with diverse pad size. Low power consumption and wide operating voltage are the contact key features for dc or ac application.
Jumpers | A | B |
---|---|---|
Toggle / High | 0 | 0 |
Toggle / Low | 1 | 0 |
Switch / High | 0 | 1 |
Switch / Low | 1 | 1 |
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