【USB charger DIY】Touch buttons and improvements

dcexpert

【USB charger DIY】Touch buttons and improvements [Copy link]

ESP32-S2 has a touch button function, so two GPIOs are used and two wires are soldered and wrapped around them several times as touch buttons.

The test found that the effect was not very good. The value change of the touch button was relatively small, only about 300.

8070 8174
8172 8199
8344 8208
8343 8200
8343 8195
8067 8179
8072 8176
8069 8187
8101 8485
8103 8493
8067 8172
8077 8178

So I welded some copper wire to increase the length.

But the effect is still not good, and it has even become a little worse.

8134 8264
8137 8270
8137 8266
8159 8307
8192 8478
8198 8479
8196 8486
8136 8270
8133 8270
8142 8271
8361 8308
8368 8307
8370 8308
8141 8266
8144 8278
8139 8269

I found a piece of tin foil, cut it into small pieces, and glued it to the inside of the upper panel.

Bend the copper wire a little more so it can touch the tin foil.

Put a piece of foam underneath to make the contact closer.

This way the effect is much better, the value changes by more than 1000 after touching.

8213 8272
8214 8274
8227 8569
8242 9560
8240 9618
8207 8281
8211 8276
8310 8305
9317 8317
9364 8560
8408 8482
8373 8279

吾妻思萌

I would like to call this yyds

吾妻思萌

Did you touch a capacitive touch button?

dfwisdom

Eyes opened, I learned

dcexpert

Azuma Simeng posted on 2024-4-19 13:15 Did you make a capacitive touch button?

Capacitive buttons can indeed be rubbed by hand