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This AT42QT1070 breakout board is the simplest way to create a project with mutiple capacitive touch sensors. No microcontroller is required here - just power with 1.8 to 5.5VDC and connect up to 5 conductive pads to the 5 left-hand pins. When a capacitive load is detected (e.g. a person touches one of the conductive contacts) the corresponding LED on the right lights up and the output pin goes low. You can use this to update an existing normal-button project where buttons connect to ground when pressed.
Note that only one contact will be detected at once (this is to protect against having a hand brush against two or more contacts at once.
Comes with a fully assembled board, and a stick of 0.1" header so you can plug it into a breadboard. For contacts, we suggest using copper foil, then solder a wire that connects from the foil pad to the breakout.
The datasheet has many details on sensitivity, power usage, etc. - note that this board uses the chip in 'standalone' mode only, it cannot be used in I2C mode.
Standalone 5-Pad Capacitive Touch Sensor Breakout - AT42QT1070
Package included:
1* AT42QT1070 Standalone 5 Keys Capacitive Touch Sensor Breakout
Andor Almasi
Reviewed in the United States on November 26, 2023
I actually needed sensors that I can communicate with over I2C, but these come configured in standalone mode. A few minutes with the soldering iron and some fine gauge wire fixed that problem. The chips work as advertised, no complaints whatsoever. One thing to consider is that these chips actually have seven channels but only five are hooked up in the default configuration. I got all seven channels to work but I could not match the sensitivity of the last two channels to the rest.
Andor Almasi
Reviewed in the United States on November 26, 2023
I actually needed sensors that I can communicate with over I2C, but these come configured in standalone mode. A few minutes with the soldering iron and some fine gauge wire fixed that problem. The chips work as advertised, no complaints whatsoever. One thing to consider is that these chips actually have seven channels but only five are hooked up in the default configuration. I got all seven channels to work but I could not match the sensitivity of the last two channels to the rest.
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