[sdiy] touch-sensitive switches - how?

Benjamin Tremblay btremblay at me.com
Tue Apr 27 23:12:30 CEST 2021


Ha ha! 
You’re right, I am thinking of something from the early 1970s. 
Senior moment. 

> On Apr 27, 2021, at 4:44 PM, Chris McDowell via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> There are also capacitive touch ICs with direct outputs on pins, like you touch and the pin goes high. I've used them, they work totally fine. You could reasonably hook one up to an analog switch and have it be micro-less. I have microcontrollers in the majority of products, and would choose a chip with I2C output normally. 
> 
> For instance: 
> 
> https://www.holtek.com/documents/10179/116677/B01-BSI-2014A4-BS813A-1.pdf <https://www.holtek.com/documents/10179/116677/B01-BSI-2014A4-BS813A-1.pdf>
> 
> Holtek makes some higher channel versions, too. Just grabbed this one quick as an example. 
> 
> Cheers, 
> Chris 
> 
> 
>> On Apr 27, 2021, at 3:21 PM, dh at atoav.com <mailto:dh at atoav.com> wrote:
>> 
>> E.g. a ESP32 supports up to 10 capacitive touch pads:
>> <https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/peripherals/touch_pad.html <https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/peripherals/touch_pad.html>>
>> 
>> There are also dedicated capacitive touch ICs with I2C, which would also
>> be a route you could go for.
>> 
>> Cheers,
>> atoav
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