<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Ha ha! <div class="">You’re right, I am thinking of something from the early 1970s. </div><div class="">Senior moment. <br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Apr 27, 2021, at 4:44 PM, Chris McDowell via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" class="">synth-diy@synth-diy.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html; charset=us-ascii" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">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. <div class=""><br class=""></div><div class="">For instance: </div><div class=""><br class=""></div><div class=""><a href="https://www.holtek.com/documents/10179/116677/B01-BSI-2014A4-BS813A-1.pdf" class="">https://www.holtek.com/documents/10179/116677/B01-BSI-2014A4-BS813A-1.pdf</a></div><div class=""><br class=""></div><div class="">Holtek makes some higher channel versions, too. Just grabbed this one quick as an example. </div><div class=""><br class=""></div><div class="">Cheers, </div><div class="">Chris <br class=""><div class=""><br class=""><div class=""><br class=""><blockquote type="cite" class=""><div class="">On Apr 27, 2021, at 3:21 PM, <a href="mailto:dh@atoav.com" class="">dh@atoav.com</a> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">E.g. a ESP32 supports up to 10 capacitive touch pads:<br class=""><<a href="https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/peripherals/touch_pad.html" class="">https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/peripherals/touch_pad.html</a>><br class=""><br class="">There are also dedicated capacitive touch ICs with I2C, which would also<br class="">be a route you could go for.<br class=""><br class="">Cheers,<br class="">atoav<br class="">_______________________________________________<br class="">Synth-diy mailing list<br class=""><a href="mailto:Synth-diy@synth-diy.org" class="">Synth-diy@synth-diy.org</a><br class=""><a href="http://synth-diy.org/mailman/listinfo/synth-diy" class="">http://synth-diy.org/mailman/listinfo/synth-diy</a><br class="">Selling or trading? Use marketplace@synth-diy.org<br class=""></div></div></blockquote></div><br class=""></div></div></div>_______________________________________________<br class="">Synth-diy mailing list<br class=""><a href="mailto:Synth-diy@synth-diy.org" class="">Synth-diy@synth-diy.org</a><br class="">http://synth-diy.org/mailman/listinfo/synth-diy<br class="">Selling or trading? Use marketplace@synth-diy.org<br class=""></div></blockquote></div><br class=""></div></body></html>