How to test Csense example for my nrf52 DK

[Giang]

Hi all,

I want to make touch button by my NRF52832 board . I am trying Csense_drv example but The value of change is constant when I log on UART . LED flashes continuously . So , I want to ask how to calibrate  for my board . And I see #define OUTPUT_PIN 26 . Follow description , Pin used to measure capacitor charging time , but I don't connect it . I connect as : 

PIN 1 to PAD 1

PIN 7 to PAD 2 

and GND to GND

Where is wrong ? 

Pls help me , thank!!!!

[Einar Thorsrud]

Hi,

A single pin per sensor pad only works when you are using the COMP implementation and have set USE_COMP to 1 in your projects sdk_config.h file. This is not enabled by default, as the ISOURCE feature of the COMP has too high variation. Your HW setup matches this configuration, but how have you set USE_COMP?

The default configuration in the SDK is USE_COMP set to 0. In this case, two pins and one resistor are needed for each sensor pad. T Hardware setup section in the Capacitive Sensor low-level library documentation shows the correct setup.

[Giang]

hi , when i set USE_COMP = 1 , Things are not getting better . 

Can you describe in detail how to test for me?

[Einar Thorsrud]

Hi,

Please refer to the Capacitive Sensor low-level library documentation for detailed description about the HW and SW setup. The Capacitive Sensor Low-level Example documentation has a short explanation about the example.