CoRe-M
New Member
Hello friends,
I’ve been working on a project for a long time. My goal is to control an aluminum LED strip profile, which is 2 meters long, by simply touching any point on it — turning the LED on and off, and adjusting its brightness via PWM duty cycle control.
Theoretically, I applied a high-frequency signal to the profile using an MCU and read back the voltage changes through an RC filter and ADC input. However, since the LED strip is powered by a plug-in type SMPS adapter, there is significant noise at the output. This noise interferes with the capacitive touch sensing and disrupts the detection area.
Moreover, the PCB layer of the LED strip is quite thin, so when it's attached to the aluminum body, it affects the capacitive balance and results in unstable touch detection — the LED toggles erratically.
I would greatly appreciate it if you could share your experiences or insights to help me improve the stability and reliability of this system.
Best Regards...
I’ve been working on a project for a long time. My goal is to control an aluminum LED strip profile, which is 2 meters long, by simply touching any point on it — turning the LED on and off, and adjusting its brightness via PWM duty cycle control.
Theoretically, I applied a high-frequency signal to the profile using an MCU and read back the voltage changes through an RC filter and ADC input. However, since the LED strip is powered by a plug-in type SMPS adapter, there is significant noise at the output. This noise interferes with the capacitive touch sensing and disrupts the detection area.
Moreover, the PCB layer of the LED strip is quite thin, so when it's attached to the aluminum body, it affects the capacitive balance and results in unstable touch detection — the LED toggles erratically.
I would greatly appreciate it if you could share your experiences or insights to help me improve the stability and reliability of this system.
Best Regards...
