ey,
ive managed to connect a sparkfun MPR121 breakout board and make it work.
now in a bit of challenge to connect 3 units of MPR121 breakout boards to an Arduino Mega.
wiring - what should i do ? - a diagram could help.
code - what should i add in the code in order to make all the electrodes work ?
im using the original example code :
https://cdn.sparkfun.com/assets/d/f/3/7/9/524ef2da757b7f8e178b4568.zip
/*Copyright (c) 2010 bildr community
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
#include "mpr121.h"
#include <Wire.h>
int irqpin = 2; // Digital 2
boolean touchStates[12]; //to keep track of the previous touch states
void setup(){
pinMode(irqpin, INPUT);
digitalWrite(irqpin, HIGH); //enable pullup resistor
Serial.begin(9600);
Wire.begin();
mpr121_setup();
}
void loop(){
readTouchInputs();
}
void readTouchInputs(){
if(!checkInterrupt()){
//read the touch state from the MPR121
Wire.requestFrom(0x5A,2);
byte LSB = Wire.read();
byte MSB = Wire.read();
uint16_t touched = ((MSB << 8) | LSB); //16bits that make up the touch states
for (int i=0; i < 12; i++){ // Check what electrodes were pressed
if(touched & (1<<i)){
if(touchStates == 0){
- //pin i was just touched*
- Serial.print("pin ");*
- Serial.print(i);*
- Serial.println(" was just touched");*
_ }else if(touchStates == 1){_
* //pin i is still being touched*
* } *
_ touchStates = 1;
}else{
if(touchStates == 1){
* Serial.print("pin ");
Serial.print(i);
Serial.println(" is no longer being touched");*_
* //pin i is no longer being touched*
* }*
_ touchStates = 0;
* }*_
* }*
* }*
}
void mpr121_setup(void){
* set_register(0x5A, ELE_CFG, 0x00);*
* // Section A - Controls filtering when data is > baseline.*
* set_register(0x5A, MHD_R, 0x01);
set_register(0x5A, NHD_R, 0x01);
set_register(0x5A, NCL_R, 0x00);
set_register(0x5A, FDL_R, 0x00);
_ // Section B - Controls filtering when data is < baseline._
set_register(0x5A, MHD_F, 0x01);
set_register(0x5A, NHD_F, 0x01);
set_register(0x5A, NCL_F, 0xFF);
set_register(0x5A, FDL_F, 0x02);*
* // Section C - Sets touch and release thresholds for each electrode*
* set_register(0x5A, ELE0_T, TOU_THRESH);
set_register(0x5A, ELE0_R, REL_THRESH);*
* set_register(0x5A, ELE1_T, TOU_THRESH);
set_register(0x5A, ELE1_R, REL_THRESH);*
* set_register(0x5A, ELE2_T, TOU_THRESH);
set_register(0x5A, ELE2_R, REL_THRESH);*
* set_register(0x5A, ELE3_T, TOU_THRESH);
set_register(0x5A, ELE3_R, REL_THRESH);*
* set_register(0x5A, ELE4_T, TOU_THRESH);
set_register(0x5A, ELE4_R, REL_THRESH);*
* set_register(0x5A, ELE5_T, TOU_THRESH);
set_register(0x5A, ELE5_R, REL_THRESH);*
* set_register(0x5A, ELE6_T, TOU_THRESH);
set_register(0x5A, ELE6_R, REL_THRESH);*
* set_register(0x5A, ELE7_T, TOU_THRESH);
set_register(0x5A, ELE7_R, REL_THRESH);*
* set_register(0x5A, ELE8_T, TOU_THRESH);
set_register(0x5A, ELE8_R, REL_THRESH);*
* set_register(0x5A, ELE9_T, TOU_THRESH);
set_register(0x5A, ELE9_R, REL_THRESH);*
* set_register(0x5A, ELE10_T, TOU_THRESH);
set_register(0x5A, ELE10_R, REL_THRESH);*
* set_register(0x5A, ELE11_T, TOU_THRESH);
set_register(0x5A, ELE11_R, REL_THRESH);*
* // Section D*
* // Set the Filter Configuration*
* // Set ESI2*
* set_register(0x5A, FIL_CFG, 0x04);*
* // Section E*
* // Electrode Configuration*
* // Set ELE_CFG to 0x00 to return to standby mode*
* set_register(0x5A, ELE_CFG, 0x0C); // Enables all 12 Electrodes*
* // Section F*
* // Enable Auto Config and auto Reconfig*
/set_register(0x5A, ATO_CFG0, 0x0B);
set_register(0x5A, ATO_CFGU, 0xC9); // USL = (Vdd-0.7)/vdd256 = 0xC9 @3.3V set_register(0x5A, ATO_CFGL, 0x82); // LSL = 0.65USL = 0x82 @3.3V
set_register(0x5A, ATO_CFGT, 0xB5);/ // Target = 0.9*USL = 0xB5 @3.3V
* set_register(0x5A, ELE_CFG, 0x0C);*
}
boolean checkInterrupt(void){
* return digitalRead(irqpin);*
}
void set_register(int address, unsigned char r, unsigned char v){
* Wire.beginTransmission(address);*
* Wire.write(r);*
* Wire.write(v);*
* Wire.endTransmission();*
}
Thanks