hci-lab-saarland / multitouchkit Goto Github PK

Hi there,

Thankyou for this library, tested on the arduino uno and it works great!

I would like to convert this to run the ESP32 using also the 74hc4067 multiplexer. The issues I'm aware of are:

• Working with 3.3V logic, could be an issue with the multiplexer
• Adding a dictionary to divert anlogue pins of uno/mega "A0 to A16" calls to relevant analogue read GPIO pins of ESP32
• Alter "MultiTouchKit::setupPWM()" for the following:

1. Method to set the timer output pin to esp32 GPIO alternative
2. Set frequency of PWM to 4MHz, 25% duty cycle (possibly using "ledcSetup(PWM_CHANNEL,PWM_FREQ,PWM_RESOLUTION);"
3. Alter "analogReference(INTERNAL); //change reference to 1.1V" to ESP32 equivalent

Thinking the following might work:

`void MultiTouchKit::setupPWM() {

#define PWM_PIN 14          // PWM pin output used
#define PWM_FREQ 4000       //set frequency to 4000
#define PWM_CHANNEL 2       // internal timer channel 0
#define PWM_RESOLUTION 12      // bit resolution

ledcSetup(PWM_CHANNEL,PWM_FREQ,PWM_RESOLUTION);  // define which PWM channel, frequency and resolution
ledcAttachPin(PWM_PIN,PWM_CHANNEL);  // Attach to GPIO pin
ledcWrite(PWM_CHANNEL,1024);  // write at 25% duty cycle 
analogSetAttenuation(ADC_0db); // similar function to analogReference(INTERNAL) method?

`
Is there anything that I could be missing or overlooking here?

Thank you in advance for your time.

Due to the arduino uno / pro mini only having 6 analog input pins the amount of columns is limited to 6 while the muliplexer mentioned in the tutorial document could theoretically support a larger matrix.

Is there a way to use the remaining unused pins from the MUX to create an 8x8 matrix for example?
Alternatively, if I add a second multiplexer, is it possible to achieve such a matrix?
Thanks in advance.

I have a breakout for the ESP32-WROVER which has enough pins to make a 5x5 grid without a multiplexer. How could I use this library with such a setup?