LED brightness control through proximity sensor (wire)

Hardware
1

LED brightness control through proximity sensor (wire)

KakaoTalk_20240628_123330426
KakaoTalk_20240628_1233304261536×1152 384 KB

KakaoTalk_20240628_123330426_01
KakaoTalk_20240628_123330426_011152×1536 480 KB

video :

Videos and PCB photos of products that have already been released are as follows.

  1. Can you give a rough inference about the above circuit?
  2. It's amazing that it recognizes human touch. What is the principle?
2

Look for these words... to find the datasheet.

board
board800×451 192 KB

1 Like
3

I guess you wanted us to look at your pictures.

  1. No
    1. probably capacitance
  3. Without a schematic and a link to the technical information it is only a guessing game. Post links, I do not bother looking up because I generally find several items and either guess which one or ask the OP for the link. Asking immediately helps as it is obvious you did not read the forum guidelines.
1 Like
4

@xfpd @gilshultz

Thank you for answer. First off, here's what I found out:

  1. It seems to recognize hands through the touch sensor (capacitance).
  2. The LED is composed of RGB, and the brightness appears to be controlled through BJT.
  3. Touch sensor: I plan to use the 'AT42QT1012' chip.
    https://www.mouser.kr/ProductDetail/Microchip-Technology/AT42QT1012-TSHR?qs=sGAEpiMZZMtI9m3qjja%2FqqMwrc21fwno%2FvMcPyMQfHc%3D
    In the video, you can see that it reacts depending on the distance. In other words, I want the voltage output to vary depending on the distance.
    I am wondering how to configure the circuit of 'AT42QT1012'.
5

Look at the datasheet...