ESP8266 Community Forum

- Fri Mar 11, 2016 1:56 pm #42914 Hello all,

I'm trying to use the MPR121 touch sensor with Sming but am getting no where...... other than more confused

Would any of you good people be able to provide an example to get me going?

Thanks!

- Mon Mar 14, 2016 5:00 pm #43144 So, it turns out to be quite easy once you know how!!!

1. Download, extract and put the Adafruit library in the Sming/Libraries folder
2. I had to change line 87 from __attribute__((deprecated)) void setThreshholds(uint8_t touch, uint8_t release); to void setThreshholds(uint8_t touch, uint8_t release);
3. Remake sming (wasn't an obvious step to me until I though about it, make clean - make - make spiffy
4 Cobble together some code based on the Arduino example (not sure if its 100% accurate and correct but it works!);

#include <user_config.h>
#include <SmingCore/SmingCore.h>
#include <Libraries/Adafruit_MPR121/Adafruit_MPR121.h>

Adafruit_MPR121 cap = Adafruit_MPR121();

// Keeps track of the last pins touched
// so we know when buttons are 'released'
uint16_t lasttouched = 0;
uint16_t currtouched = 0;

Timer procTouchTimer;

void touch()
{

// Get the currently touched pads
currtouched = cap.touched();

for (uint8_t i=0; i<12; i++) {
// it if *is* touched and *wasnt* touched before, alert!
if ((currtouched & _BV(i)) && !(lasttouched & _BV(i)) ) {
Serial.print(i); Serial.println(" touched");
}
// if it *was* touched and now *isnt*, alert!
if (!(currtouched & _BV(i)) && (lasttouched & _BV(i)) ) {
Serial.print(i); Serial.println(" released");
}
}

// reset our state
lasttouched = currtouched;

// comment out this line for detailed data from the sensor!
return;

// debugging info, what
Serial.print("\t\t\t\t\t\t\t\t\t\t\t\t\t 0x"); Serial.println(cap.touched(), HEX);
Serial.print("Filt: ");
for (uint8_t i=0; i<12; i++) {
Serial.print(cap.filteredData(i)); Serial.print("\t");
}
Serial.println();
Serial.print("Base: ");
for (uint8_t i=0; i<12; i++) {
Serial.print(cap.baselineData(i)); Serial.print("\t");
}
Serial.println();


}


void init()
{
Serial.begin(SERIAL_BAUD_RATE); // 115200 by default
Serial.systemDebugOutput(true); // Debug output to serial



cap.begin(0x5A);
procTouchTimer.initializeMs(1 * 500, touch).start(); // check every 500ms

}



Hope that helps someone out! I guess it would be similar for other libraries too.

- Tue Jun 13, 2017 8:50 am #67107

So, it turns out to be quite easy once you know how!!!

1. Download, extract and put the Adafruit library in the Sming/Libraries folder
2. I had to change line 87 from __attribute__((deprecated)) void setThreshholds(uint8_t touch, uint8_t release); to void setThreshholds(uint8_t touch, uint8_t release);
3. Remake sming (wasn't an obvious step to me until I though about it, make clean - make - make spiffy
4 Cobble together some code based on the Arduino example (not sure if its 100% accurate and correct but it works!);

Hope that helps someone out! I guess it would be similar for other libraries too.

Hello,
I'm sorry.. I'm very new to the NodeMCU and MPR121
What does remake sming mean?
Where should I change the line of code(line 87)?

Any help would be great

Thanks,
Zhinc