AliExpress TTP223 Touch Key Switch Module Touch Button Capacitive Switches Self-Locking/No-Locking Capacitive Touch Switches – US$1.48/lot (10Pcs)
https://fr.aliexpress.com/item/10Pcs-TTP223-Touch-Key-Switch-Module-Touch-Button-Capacitive-Switches-Self-Locking-No-Locking-Capacitive-Touch/32890385296.html?spm=a2g0w.10010108.1000016.1.97e9234cXIG3Fn&isOrigTitle=true

AliEXpress XD21 6x6MM keypad keyboard Touch the switch module board 6*6mm – US$0.22
https://fr.aliexpress.com/item/XD21-6x6MM-keypad-keyboard-Touch-the-switch-module-board/32805745580.html?spm=a2g0w.10010108.1000016.1.d40736c4iCb8Hc&isOrigTitle=true

Tutorial for TTP223 Touch Sensor Module (Capacitive) By mybotic in Electronics 15,684
https://www.instructables.com/id/Tutorial-for-TTP223-Touch-Sensor-Module-Capacitive/

XD21 6x6MM 按键模块 轻触开关模块 – ¥1.28
https://item.taobao.com/item.htm?spm=2013.1.20160405.9.1630649bW56rAi&scm=1007.13066.127221.0&id=560945268978

TTP223 触摸按键模块 自锁 点动 电容式 开关 单路改造 ¥0.20
https://item.taobao.com/item.htm?spm=a1z1r.7974869.0.0.269c3ad4cmNN1f&id=534800000821

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