Hello Everyone,
I am new to the Kinetis Series of Micro-controller and I am using MKE15Z micro-controller for the touch-based project, all of my keys are configured as self-capacitance electrodes.
I used the touch_sensing example from the SDK and modified it to suit my needs. And here is the visualization on one of the electrodes.
Now I am in the phase of tuning the touch parameters, but to start it looks complicated to me, although I am taking reference from the touch manual to help me get started.
In this case (shown above), the dead-band signal and the predicted signal are very close, this means that I have to reduce it? or there is a way I can increase the gain of the predicted signal.
I checked the examples and found that usually the dead-band signal is kept 600+baseline level, in my case I have just put this value to 400.
When I touch the Electrode, the response is very slow, and when is release the Electrode, the response is even slower.
I have used a LED, which gets turned on when Electrode is press and off when Electrode is released.
How to prevent this?
const struct nt_electrode El_1 = {
.shielding_electrode = NULL,
.multiplier = 0,
.divider = 0,
.shield_threshold = 5,
.shield_gain = 30,
.shield_attn = 1,
.shield_sens = 800,
.keydetector_params.usafa = &nt_keydetector_usafa_El_1,
.keydetector_interface = &nt_keydetector_usafa_interface,
.pin_input = 2,
.gpio_input = GPIO_PTE10,
.baseline_level = 36363,
};const struct nt_keydetector_usafa nt_keydetector_usafa_El_1 = {
.signal_filter.coef1 = 2,
.base_avrg.n2_order = 12,
.non_activity_avrg.n2_order = 15,
.entry_event_cnt = 4,
.deadband_cnt = 4,
.signal_to_noise_ratio = 2,
.min_noise_limit = 200,
.dc_track_enabled = 1,
.dc_track_cnt = 100,
};Another problem is with FreeMASTER, every time I have to change the colors of the signal as they are reverted back to black color always (FreeMASTER Version 3.0.2.6)
So, to summarize I want to know if there is a document, which can help me in tuning the touch parameters for my board.
Any webinar, tutorial, document link will be extremely helpful.
Thanks in advance.
