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Electronics => Projects, Designs, and Technical Stuff => Topic started by: ypkdani on October 28, 2019, 11:12:14 am

Title: Touch button and slider design
Post by: ypkdani on October 28, 2019, 11:12:14 am
Hello all,

i have a problem with my first design of a touch button and a slider on a 4layer pcb (top-layer2-layer1-bottom) using a STM32L162 with its peripheralTouch sensing. As you can see from the image i have design the button and the slider with a shield to increase the noise immunity. My problem is a) the sensitivity that is not enough b) reduce the noise from the leds on the bottom that light up the device.
Up the pcb i have 2mm of plastic so i need to increase the sensitivity of the buttons for detect the slider or the button press. My ideas are:

In the image you can see the signal from the button, or slider, from the channel 1 and the shield signal from the channel 2.

Do you have other suggestions??