Advanced RISC Technology

Teensy 4.0 Application board

Teensy 4.0 Application board

1. MIDI IO with DIN5 connectors and Optical isolation
2. ESP8266 WiFi Radio
3. Class D Sterio Amp
4. 4 Pots and 4 Switches
5. 240x320 Color LCD
6. Teensy 4.0 I2S Audio interface board
7. Line level Audio input and output
8. Touch Keyboard interface
9. Extra IOs routed to headers

Bill of Material for Teensy 4.0 Application board

Comment	PCB Footprint	Quantity	Components	DESC & LINK	Price
PAM8403MOD	3W Sterio Class D Am module	AMP1	PAM8403_MOD	https://www.amazon.com/PAM8403-Channel-Amplifier-Envistia-Mall/dp/B07N12VPTS	1.75
TEENSY AUDIO		AUD1	teensy_audio - rev4	https://www.pjrc.com/store/teensy3_audio.html	13.75
100uf	Capacitor	C3	EL-TH2.5-5X11	CAP POL	1
100nf	Capacitor	C4, C5, C6, C7, C8, C9, C10, C11	RADCAP-0.2	CAP NP	8
1uf	Capacitor	C12, C13	RADCAP-0.2	CAP NP	2
1N5819	DIODE SCHOTTKY 40V 1A DO-41	D1	AXIAL-0.4 - DIODE	DIODE SCHOTTKY	1
RCA	RCA PC QUAD VERT MOUNT	J1	RCA-QUAD-2x2	RCA-QUAD-VERT	1
MIDI IN	5-pin circular DIN connector	J2	5-PIN-DIN-RA-PCB-NEW	5-PIN-CIRCULAR-DINNEW	1
MIDI OUT	5-pin circular DIN connector	J3	5-PIN-DIN-RA-PCB-NEW	5-PIN-CIRCULAR-DINNEW	1
5PIN-SIL_1	5 Pin Single In line .1 Inch centers	J4	SIP-5	5PIN-SIL_1	1
PWR_2.1MM	Small Wall Power THRU	J5	POWER_BARREL_RAPC722X	PWR_2.1MM	1
Teensy4.0	ortex-M7 Dev Board	M1	teensy40EX	teensy40EX	1
ILi9341	240x320 TFT Display	M2	ILi9341	ILi9341	1
6PIN-SIL	6 Pin Single In line .1 Inch centers	P1, P2, P4, P5	SIP-6	6PIN-SIL	4
6PIN-SIL	6 Pin Single In line .1 Inch centers	P3	SIP-6-F-RT	6PIN-SIL	1
2PIN-POW	Terminal Block 2 pos 5mm	P6, P7	OSTTC02	2PIN-POW	2
10PINDIL		P8	IDC-10	10PINDIL	1
NPN	NPN Transistor	Q1	TO92 - S	NPN	1
4.7K	RESISTOR	R1, R2, R3, R7, R17	AXIAL-0.4	R	5
1K	RESISTOR	R4, R5, R8, R9, R10	AXIAL-0.4	R	5
220R	RESISTOR	R6, R12, R13	AXIAL-0.4	R	3
100R	RESISTOR	R11	AXIAL-0.4	R	1
2.2K	RESISTOR	R14	AXIAL-0.4	R	1
10K	RESISTOR	R15	AXIAL-0.4	R	1
POT_TT	Potentiometer	R16, R18, R19, R20	POT_TTPO90S	POT_TT	4
ESP2866	ESP2866 WiFiModule	RADIO1	ESP2866_Serial_Module	ESP2866	1
SW_PDT _TOGGLE		SW1, SW2, SW3, SW4	SW_SPDT_TOGGLE	SW_PDT _TOGGLE	4
6N138M	Optoisolator, darlington pair output	U1	DIP8	OPTO_DARL_6N138S	1
23LC1024	1 Mbit Serial SRAM	U2	DIP8	23LC1024	1
TC1262-3.3	+5 Volt Positive 3 terminal regulator	U3	TO220	LM7805	1

Firmware example
#include <Audio.h> #include <Wire.h> #include <SPI.h> #include <SD.h> #include <SerialFlash.h> #include <i2c_t3.h> #include "mpr121.h" #include <Bounce.h> Bounce switch0 = Bounce(30, 15); Bounce switch1 = Bounce(31, 15); Bounce switch2 = Bounce(32, 15); Bounce switch3 = Bounce(33, 15); int current_waveform = WAVEFORM_TRIANGLE; // GUItool: begin automatically generated code AudioSynthWaveform waveform1; //xy=90,215 AudioSynthWaveform waveform4; //xy=90,359 AudioSynthWaveform waveform3; //xy=91,313 AudioSynthWaveform waveform2; //xy=93,262 AudioSynthWaveform waveform5; //xy=93,402 AudioSynthWaveform waveform6; //xy=94,448 AudioSynthWaveform waveform7; //xy=96,491 AudioSynthWaveform waveform9; //xy=98,575 AudioSynthWaveform waveform8; //xy=99,531 AudioSynthWaveform waveform43; //xy=97,2095 AudioSynthWaveform waveform44; //xy=97,2140 AudioSynthWaveform waveform10; //xy=104,619 AudioSynthWaveform waveform29; //xy=101,1460 AudioSynthWaveform waveform46; //xy=98,2238 AudioSynthWaveform waveform36; //xy=100,1771 AudioSynthWaveform waveform38; //xy=100,1859 AudioSynthWaveform waveform28; //xy=102,1413 AudioSynthWaveform waveform45; //xy=99,2187 AudioSynthWaveform waveform35; //xy=101,1727 AudioSynthWaveform waveform30; //xy=102,1501 AudioSynthWaveform waveform42; //xy=100,2047 AudioSynthWaveform waveform37; //xy=101,1812 AudioSynthWaveform waveform39; //xy=101,1905 AudioSynthWaveform waveform34; //xy=102,1681 AudioSynthWaveform waveform27; //xy=104,1367 AudioSynthWaveform waveform12; //xy=107,709 AudioSynthWaveform waveform47; //xy=101,2287 AudioSynthWaveform waveform31; //xy=104,1548 AudioSynthWaveform waveform33; //xy=104,1636 AudioSynthWaveform waveform17; //xy=107,925 AudioSynthWaveform waveform40; //xy=103,1950 AudioSynthWaveform waveform41; //xy=103,1997 AudioSynthWaveform waveform13; //xy=108,751 AudioSynthWaveform waveform14; //xy=108,793 AudioSynthWaveform waveform48; //xy=102,2335 AudioSynthWaveform waveform11; //xy=109,665 AudioSynthWaveform waveform32; //xy=106,1590 AudioSynthWaveform waveform16; //xy=109,884 AudioSynthWaveform waveform18; //xy=109,966 AudioSynthWaveform waveform15; //xy=110,838 AudioSynthWaveform waveform26; //xy=109,1322 AudioSynthWaveform waveform19; //xy=111,1010 AudioSynthWaveform waveform25; //xy=110,1278 AudioSynthWaveform waveform21; //xy=111,1098 AudioSynthWaveform waveform23; //xy=111,1192 AudioSynthWaveform waveform24; //xy=113,1232 AudioSynthWaveform waveform20; //xy=114,1050 AudioSynthWaveform waveform22; //xy=115,1145 AudioMixer4 mixer8; //xy=296,1523 AudioMixer4 mixer10; //xy=296,1876 AudioMixer4 mixer11; //xy=296,2068 AudioMixer4 mixer9; //xy=299,1704 AudioMixer4 mixer12; //xy=298,2251 AudioMixer4 mixer1; //xy=308,291 AudioMixer4 mixer5; //xy=308,977 AudioMixer4 mixer7; //xy=307,1346 AudioMixer4 mixer6; //xy=308,1163 AudioMixer4 mixer2; //xy=316,466 AudioMixer4 mixer3; //xy=318,637 AudioMixer4 mixer4; //xy=318,818 AudioMixer4 mixer15; //xy=534,1977 AudioMixer4 mixer14; //xy=546,1283 AudioMixer4 mixer13; //xy=566,553 AudioMixer4 mixer16; //xy=859,1290 AudioOutputI2S i2s1; //xy=1061,1291 AudioConnection patchCord1(waveform1, 0, mixer1, 0); AudioConnection patchCord2(waveform4, 0, mixer1, 3); AudioConnection patchCord3(waveform3, 0, mixer1, 2); AudioConnection patchCord4(waveform2, 0, mixer1, 1); AudioConnection patchCord5(waveform5, 0, mixer2, 0); AudioConnection patchCord6(waveform6, 0, mixer2, 1); AudioConnection patchCord7(waveform7, 0, mixer2, 2); AudioConnection patchCord8(waveform9, 0, mixer3, 0); AudioConnection patchCord9(waveform8, 0, mixer2, 3); AudioConnection patchCord10(waveform43, 0, mixer11, 2); AudioConnection patchCord11(waveform44, 0, mixer11, 3); AudioConnection patchCord12(waveform10, 0, mixer3, 1); AudioConnection patchCord13(waveform29, 0, mixer8, 0); AudioConnection patchCord14(waveform46, 0, mixer12, 1); AudioConnection patchCord15(waveform36, 0, mixer9, 3); AudioConnection patchCord16(waveform38, 0, mixer10, 1); AudioConnection patchCord17(waveform28, 0, mixer7, 3); AudioConnection patchCord18(waveform45, 0, mixer12, 0); AudioConnection patchCord19(waveform35, 0, mixer9, 2); AudioConnection patchCord20(waveform30, 0, mixer8, 1); AudioConnection patchCord21(waveform42, 0, mixer11, 1); AudioConnection patchCord22(waveform37, 0, mixer10, 0); AudioConnection patchCord23(waveform39, 0, mixer10, 2); AudioConnection patchCord24(waveform34, 0, mixer9, 1); AudioConnection patchCord25(waveform27, 0, mixer7, 2); AudioConnection patchCord26(waveform12, 0, mixer3, 3); AudioConnection patchCord27(waveform47, 0, mixer12, 2); AudioConnection patchCord28(waveform31, 0, mixer8, 2); AudioConnection patchCord29(waveform33, 0, mixer9, 0); AudioConnection patchCord30(waveform17, 0, mixer5, 0); AudioConnection patchCord31(waveform40, 0, mixer10, 3); AudioConnection patchCord32(waveform41, 0, mixer11, 0); AudioConnection patchCord33(waveform13, 0, mixer4, 0); AudioConnection patchCord34(waveform14, 0, mixer4, 1); AudioConnection patchCord35(waveform48, 0, mixer12, 3); AudioConnection patchCord36(waveform11, 0, mixer3, 2); AudioConnection patchCord37(waveform32, 0, mixer8, 3); AudioConnection patchCord38(waveform16, 0, mixer4, 3); AudioConnection patchCord39(waveform18, 0, mixer5, 1); AudioConnection patchCord40(waveform15, 0, mixer4, 2); AudioConnection patchCord41(waveform26, 0, mixer7, 1); AudioConnection patchCord42(waveform19, 0, mixer5, 2); AudioConnection patchCord43(waveform25, 0, mixer7, 0); AudioConnection patchCord44(waveform21, 0, mixer6, 0); AudioConnection patchCord45(waveform23, 0, mixer6, 2); AudioConnection patchCord46(waveform24, 0, mixer6, 3); AudioConnection patchCord47(waveform20, 0, mixer5, 3); AudioConnection patchCord48(waveform22, 0, mixer6, 1); AudioConnection patchCord49(mixer8, 0, mixer14, 3); AudioConnection patchCord50(mixer10, 0, mixer15, 1); AudioConnection patchCord51(mixer11, 0, mixer15, 2); AudioConnection patchCord52(mixer9, 0, mixer15, 0); AudioConnection patchCord53(mixer12, 0, mixer15, 3); AudioConnection patchCord54(mixer1, 0, mixer13, 0); AudioConnection patchCord55(mixer5, 0, mixer14, 0); AudioConnection patchCord56(mixer7, 0, mixer14, 2); AudioConnection patchCord57(mixer6, 0, mixer14, 1); AudioConnection patchCord58(mixer2, 0, mixer13, 1); AudioConnection patchCord59(mixer3, 0, mixer13, 2); AudioConnection patchCord60(mixer4, 0, mixer13, 3); AudioConnection patchCord61(mixer15, 0, mixer16, 2); AudioConnection patchCord62(mixer14, 0, mixer16, 1); AudioConnection patchCord63(mixer13, 0, mixer16, 0); AudioConnection patchCord64(mixer16, 0, i2s1, 0); AudioConnection patchCord65(mixer16, 0, i2s1, 1); AudioControlSGTL5000 sgtl5000_1; //xy=845,2096 // GUItool: end automatically generated code int amp[4] = {0,0,0,0}; boolean touchStates[48]; int irqpin = 11; // Digital 11 void setup() { AudioMemory(20); sgtl5000_1.enable(); sgtl5000_1.volume(0.32); waveform1.begin(current_waveform); waveform1.amplitude(0.5); waveform1.frequency(65.41); //C2 waveform2.begin(current_waveform); waveform2.amplitude(0.0); waveform2.frequency(69.30); //C2# waveform3.begin(current_waveform); waveform3.amplitude(0.0); waveform3.frequency(73.42); //D2 waveform4.begin(current_waveform); waveform4.amplitude(0.0); waveform4.frequency(77.78); //D2# waveform5.begin(current_waveform); waveform5.amplitude(0.0); waveform5.frequency(82.41); //E2 waveform6.begin(current_waveform); waveform6.amplitude(0.0); waveform6.frequency(87.31); //F2 waveform7.begin(current_waveform); waveform7.amplitude(0.0); waveform7.frequency(92.50); //F2# waveform8.begin(current_waveform); waveform8.amplitude(0.0); waveform8.frequency(98.00); // G2 waveform9.begin(current_waveform); waveform9.amplitude(0.0); waveform9.frequency(103.83); //G2# //--- waveform10.begin(current_waveform); waveform10.amplitude(0.0); waveform10.frequency(110.00); //A2 waveform11.begin(current_waveform); waveform11.amplitude(0.0); waveform11.frequency(116.54); //A2# waveform12.begin(current_waveform); waveform12.amplitude(0.0); waveform12.frequency(123.47); //B3 waveform13.begin(current_waveform); waveform13.amplitude(0.0); waveform13.frequency(130.81); //C3 waveform14.begin(current_waveform); waveform14.amplitude(0.0); waveform14.frequency(138.59); //C3# waveform15.begin(current_waveform); waveform15.amplitude(0.0); waveform15.frequency(146.83); //D3 waveform16.begin(current_waveform); waveform16.amplitude(0.0); waveform16.frequency(155.56); //D3# waveform17.begin(current_waveform); waveform17.amplitude(0.0); waveform17.frequency(164.81); //E3 waveform18.begin(current_waveform); waveform18.amplitude(0.0); waveform18.frequency(174.61); //F3 waveform19.begin(current_waveform); waveform19.amplitude(0.0); waveform19.frequency(185.00); //F3# //--- waveform20.begin(current_waveform); waveform20.amplitude(0.0); waveform20.frequency(196.00); //G3 waveform21.begin(current_waveform); waveform21.amplitude(0.0); waveform21.frequency(207.65); //G3# waveform22.begin(current_waveform); waveform22.amplitude(0.0); waveform22.frequency(220.00); // A3 waveform23.begin(current_waveform); waveform23.amplitude(0.0); waveform23.frequency(233.08); // A3# waveform24.begin(current_waveform); waveform24.amplitude(0.0); waveform24.frequency(246.94); // B3 waveform25.begin(current_waveform); waveform25.amplitude(0.0); waveform25.frequency(261.63); //C4 waveform26.begin(current_waveform); waveform26.amplitude(0.0); waveform26.frequency(277.18); //C4# waveform27.begin(current_waveform); waveform27.amplitude(0.0); waveform27.frequency(293.66); //D4 waveform28.begin(current_waveform); waveform28.amplitude(0.0); waveform28.frequency(311.13); //D4# waveform29.begin(current_waveform); waveform29.amplitude(0.0); waveform29.frequency(329.63); //E4 //--- waveform30.begin(current_waveform); waveform30.amplitude(0.0); waveform30.frequency(349.23); //F4 waveform31.begin(current_waveform); waveform31.amplitude(0.0); waveform31.frequency(369.99); //F4# waveform32.begin(current_waveform); waveform32.amplitude(0.0); waveform32.frequency(392.00); //G4 waveform33.begin(current_waveform); waveform33.amplitude(0.0); waveform33.frequency(415.30); //G4# waveform34.begin(current_waveform); waveform34.amplitude(0.0); waveform34.frequency(440.00); //A4 waveform35.begin(current_waveform); waveform35.amplitude(0.0); waveform35.frequency(466.16); //A4# waveform36.begin(current_waveform); waveform36.amplitude(0.0); waveform36.frequency(493.88); //B4 waveform37.begin(current_waveform); waveform37.amplitude(0.0); waveform37.frequency(523.25); //C5 waveform38.begin(current_waveform); waveform38.amplitude(0.0); waveform38.frequency(554.37); //C5# waveform39.begin(current_waveform); waveform39.amplitude(0.0); waveform39.frequency(587.33); //D5 //--- waveform40.begin(current_waveform); waveform40.amplitude(0.0); waveform40.frequency(622.25); // D5# waveform41.begin(current_waveform); waveform41.amplitude(0.0); waveform41.frequency(659.25); //E5 waveform42.begin(current_waveform); waveform42.amplitude(0.0); waveform42.frequency(698.46); //F5 waveform43.begin(current_waveform); waveform43.amplitude(0.0); waveform43.frequency(739.99); //F5# waveform44.begin(current_waveform); waveform44.amplitude(0.0); waveform44.frequency(783.99); //G5 waveform45.begin(current_waveform); waveform45.amplitude(0.0); waveform45.frequency(830.61); //G5# waveform46.begin(current_waveform); waveform46.amplitude(0.0); waveform46.frequency(880.00); //A5 waveform47.begin(current_waveform); waveform47.amplitude(0.0); waveform47.frequency(932.33); //A5# waveform48.begin(current_waveform); waveform48.amplitude(0.0); waveform48.frequency(987.77); //B5 //--- mixer1.gain(0, 1.0); mixer1.gain(1, 1.0); mixer1.gain(2, 1.0); mixer1.gain(3, 1.0); mixer2.gain(0, 1.0); mixer2.gain(1, 1.0); mixer2.gain(2, 1.0); mixer2.gain(3, 1.0); mixer3.gain(0, 1.0); mixer3.gain(1, 1.0); mixer3.gain(2, 1.0); mixer3.gain(3, 1.0); mixer4.gain(0, 1.0); mixer4.gain(1, 1.0); mixer4.gain(2, 1.0); mixer4.gain(3, 1.0); mixer5.gain(0, 1.0); mixer5.gain(1, 1.0); mixer5.gain(2, 1.0); mixer5.gain(3, 1.0); mixer6.gain(0, 1.0); mixer6.gain(1, 1.0); mixer6.gain(2, 1.0); mixer6.gain(3, 1.0); mixer7.gain(0, 1.0); mixer7.gain(1, 1.0); mixer7.gain(2, 1.0); mixer7.gain(3, 1.0); mixer8.gain(0, 1.0); mixer8.gain(1, 1.0); mixer8.gain(2, 1.0); mixer8.gain(3, 1.0); mixer9.gain(0, 1.0); mixer9.gain(1, 1.0); mixer9.gain(2, 1.0); mixer9.gain(3, 1.0); mixer10.gain(0, 1.0); mixer10.gain(1, 1.0); mixer10.gain(2, 1.0); mixer10.gain(3, 1.0); mixer11.gain(0, 1.0); mixer11.gain(1, 1.0); mixer11.gain(2, 1.0); mixer11.gain(3, 1.0); mixer12.gain(0, 1.0); mixer12.gain(1, 1.0); mixer12.gain(2, 1.0); mixer12.gain(3, 1.0); mixer13.gain(0, .5); mixer13.gain(1, .5); mixer13.gain(2, .5); mixer13.gain(3, .5); mixer14.gain(0, .5); mixer14.gain(1, .5); mixer14.gain(2, .5); mixer14.gain(3, .5); mixer15.gain(0, .5); mixer15.gain(1, .5); mixer15.gain(2, .5); mixer15.gain(3, .5); mixer16.gain(0, 1.0); mixer16.gain(1, 1.0); mixer16.gain(2, 1.0); mixer16.gain(3, 1.0); analogReadResolution(12); mpr121_setup(0x5A); mpr121_setup(0x5B); mpr121_setup(0x5C); mpr121_setup(0x5D); } void loop(){ if ( switch0.update() || switch1.update() || switch2.update() || switch3.update() ){ bool sw0 = switch0.read(); bool sw1 = switch1.read(); bool sw2 = switch2.read(); bool sw3 = switch3.read(); // WAVEFORM_SINE : WAVEFORM_TRIANGLE; WAVEFORM_SAWTOOTH WAVEFORM_SQUARE select (sw0) ? ( (sw1) ? current_waveform = WAVEFORM_SQUARE : current_waveform = WAVEFORM_SAWTOOTH ) : ( (sw1) ? current_waveform = WAVEFORM_TRIANGLE : current_waveform = WAVEFORM_SINE ); waveform1.begin(current_waveform); waveform2.begin(current_waveform); waveform3.begin(current_waveform); waveform4.begin(current_waveform); waveform5.begin(current_waveform); waveform6.begin(current_waveform); waveform7.begin(current_waveform); waveform8.begin(current_waveform); waveform9.begin(current_waveform); //-- waveform10.begin(current_waveform); waveform11.begin(current_waveform); waveform12.begin(current_waveform); waveform13.begin(current_waveform); waveform14.begin(current_waveform); waveform15.begin(current_waveform); waveform16.begin(current_waveform); waveform17.begin(current_waveform); waveform18.begin(current_waveform); waveform19.begin(current_waveform); // waveform20.begin(current_waveform); waveform21.begin(current_waveform); waveform22.begin(current_waveform); waveform23.begin(current_waveform); waveform24.begin(current_waveform); waveform25.begin(current_waveform); waveform26.begin(current_waveform); waveform27.begin(current_waveform); waveform28.begin(current_waveform); waveform29.begin(current_waveform); // waveform30.begin(current_waveform); waveform31.begin(current_waveform); waveform32.begin(current_waveform); waveform33.begin(current_waveform); waveform34.begin(current_waveform); waveform35.begin(current_waveform); waveform36.begin(current_waveform); waveform37.begin(current_waveform); waveform38.begin(current_waveform); waveform39.begin(current_waveform); // waveform40.begin(current_waveform); waveform41.begin(current_waveform); waveform42.begin(current_waveform); waveform43.begin(current_waveform); waveform44.begin(current_waveform); waveform45.begin(current_waveform); waveform46.begin(current_waveform); waveform47.begin(current_waveform); waveform48.begin(current_waveform); // } readTouchInputs(); amp[0] = analogRead(A0); amp[1] = analogRead(A1); amp[2] = analogRead(A2); amp[3] = analogRead(A3); float lastgain = (float)amp[0]/4095; mixer16.gain(0, lastgain); mixer16.gain(1, lastgain); mixer16.gain(2, lastgain); mixer16.gain(3, lastgain); (touchStates[0]==1) ? waveform1.amplitude(0.5) : waveform1.amplitude(0.0); (touchStates[1]) ? waveform2.amplitude(0.5) : waveform2.amplitude(0.0); (touchStates[2]) ? waveform3.amplitude(0.5) : waveform3.amplitude(0.0); (touchStates[3]) ? waveform4.amplitude(0.5) : waveform4.amplitude(0.0); (touchStates[4]) ? waveform5.amplitude(0.5) : waveform5.amplitude(0.0); (touchStates[5]) ? waveform6.amplitude(0.5) : waveform6.amplitude(0.0); (touchStates[6]) ? waveform7.amplitude(0.5) : waveform7.amplitude(0.0); (touchStates[7]) ? waveform8.amplitude(0.5) : waveform8.amplitude(0.0); (touchStates[8]) ? waveform9.amplitude(0.5) : waveform9.amplitude(0.0); (touchStates[9]) ? waveform10.amplitude(0.5) : waveform10.amplitude(0.0); (touchStates[10]) ? waveform11.amplitude(0.5) : waveform11.amplitude(0.0); (touchStates[11]) ? waveform12.amplitude(0.5) : waveform12.amplitude(0.0); (touchStates[12]) ? waveform13.amplitude(0.5) : waveform13.amplitude(0.0); (touchStates[13]) ? waveform14.amplitude(0.5) : waveform14.amplitude(0.0); (touchStates[14]) ? waveform15.amplitude(0.5) : waveform15.amplitude(0.0); (touchStates[15]) ? waveform16.amplitude(0.5) : waveform16.amplitude(0.0); (touchStates[16]) ? waveform17.amplitude(0.5) : waveform17.amplitude(0.0); (touchStates[17]) ? waveform18.amplitude(0.5) : waveform18.amplitude(0.0); (touchStates[18]) ? waveform19.amplitude(0.5) : waveform19.amplitude(0.0); (touchStates[19]) ? waveform20.amplitude(0.5) : waveform20.amplitude(0.0); (touchStates[20]) ? waveform21.amplitude(0.5) : waveform21.amplitude(0.0); (touchStates[21]) ? waveform22.amplitude(0.5) : waveform22.amplitude(0.0); (touchStates[22]) ? waveform23.amplitude(0.5) : waveform23.amplitude(0.0); (touchStates[23]) ? waveform24.amplitude(0.5) : waveform24.amplitude(0.0); (touchStates[24]) ? waveform25.amplitude(0.5) : waveform25.amplitude(0.0); (touchStates[25]) ? waveform26.amplitude(0.5) : waveform26.amplitude(0.0); (touchStates[26]) ? waveform27.amplitude(0.5) : waveform27.amplitude(0.0); (touchStates[27]) ? waveform28.amplitude(0.5) : waveform28.amplitude(0.0); (touchStates[28]) ? waveform29.amplitude(0.5) : waveform29.amplitude(0.0); (touchStates[29]) ? waveform30.amplitude(0.5) : waveform30.amplitude(0.0); (touchStates[30]) ? waveform31.amplitude(0.5) : waveform31.amplitude(0.0); (touchStates[31]) ? waveform32.amplitude(0.5) : waveform32.amplitude(0.0); (touchStates[32]) ? waveform33.amplitude(0.5) : waveform33.amplitude(0.0); (touchStates[33]) ? waveform34.amplitude(0.5) : waveform34.amplitude(0.0); (touchStates[34]) ? waveform35.amplitude(0.5) : waveform35.amplitude(0.0); (touchStates[35]) ? waveform36.amplitude(0.5) : waveform36.amplitude(0.0); (touchStates[36]) ? waveform37.amplitude(0.5) : waveform37.amplitude(0.0); (touchStates[37]) ? waveform38.amplitude(0.5) : waveform38.amplitude(0.0); (touchStates[38]) ? waveform39.amplitude(0.5) : waveform39.amplitude(0.0); (touchStates[39]) ? waveform40.amplitude(0.5) : waveform40.amplitude(0.0); (touchStates[40]) ? waveform41.amplitude(0.5) : waveform41.amplitude(0.0); (touchStates[41]) ? waveform42.amplitude(0.5) : waveform42.amplitude(0.0); (touchStates[42]) ? waveform43.amplitude(0.5) : waveform43.amplitude(0.0); (touchStates[43]) ? waveform44.amplitude(0.5) : waveform44.amplitude(0.0); (touchStates[44]) ? waveform45.amplitude(0.5) : waveform45.amplitude(0.0); (touchStates[45]) ? waveform46.amplitude(0.5) : waveform46.amplitude(0.0); (touchStates[46]) ? waveform47.amplitude(0.5) : waveform47.amplitude(0.0); (touchStates[47]) ? waveform48.amplitude(0.5) : waveform48.amplitude(0.0); } void mpr121_setup(char wireadd){ set_register(wireadd, ELE_CFG, 0x00); // Section A - Controls filtering when data is > baseline. set_register(wireadd, MHD_R, 0x01); set_register(wireadd, NHD_R, 0x01); set_register(wireadd, NCL_R, 0x00); set_register(wireadd, FDL_R, 0x00); // Section B - Controls filtering when data is < baseline. set_register(wireadd, MHD_F, 0x01); set_register(wireadd, NHD_F, 0x01); set_register(wireadd, NCL_F, 0xFF); set_register(wireadd, FDL_F, 0x02); // Section C - Sets touch and release thresholds for each electrode set_register(wireadd, ELE0_T, TOU_THRESH); set_register(wireadd, ELE0_R, REL_THRESH); set_register(wireadd, ELE1_T, TOU_THRESH); set_register(wireadd, ELE1_R, REL_THRESH); set_register(wireadd, ELE2_T, TOU_THRESH); set_register(wireadd, ELE2_R, REL_THRESH); set_register(wireadd, ELE3_T, TOU_THRESH); set_register(wireadd, ELE3_R, REL_THRESH); set_register(wireadd, ELE4_T, TOU_THRESH); set_register(wireadd, ELE4_R, REL_THRESH); set_register(wireadd, ELE5_T, TOU_THRESH); set_register(wireadd, ELE5_R, REL_THRESH); set_register(wireadd, ELE6_T, TOU_THRESH); set_register(wireadd, ELE6_R, REL_THRESH); set_register(wireadd, ELE7_T, TOU_THRESH); set_register(wireadd, ELE7_R, REL_THRESH); set_register(wireadd, ELE8_T, TOU_THRESH); set_register(wireadd, ELE8_R, REL_THRESH); set_register(wireadd, ELE9_T, TOU_THRESH); set_register(wireadd, ELE9_R, REL_THRESH); set_register(wireadd, ELE10_T, TOU_THRESH); set_register(wireadd, ELE10_R, REL_THRESH); set_register(wireadd, ELE11_T, TOU_THRESH); set_register(wireadd, ELE11_R, REL_THRESH); // Section D // Set the Filter Configuration // Set ESI2 set_register(wireadd, FIL_CFG, 0x04); // Section E // Electrode Configuration // Set ELE_CFG to 0x00 to return to standby mode set_register(wireadd, ELE_CFG, 0x0C); // Enables all 12 Electrodes // Section F // Enable Auto Config and auto Reconfig /*set_register(wireadd, ATO_CFG0, 0x0B); set_register(wireadd, ATO_CFGU, 0xC9); // USL = (Vdd-0.7)/vdd*256 = 0xC9 @3.3V set_register(wireadd, ATO_CFGL, 0x82); // LSL = 0.65*USL = 0x82 @3.3V set_register(wireadd, ATO_CFGT, 0xB5);*/ // Target = 0.9*USL = 0xB5 @3.3V set_register(wireadd, ELE_CFG, 0x0C); } void set_register(int address, unsigned char r, unsigned char v){ Wire.beginTransmission(address); Wire.write(r); Wire.write(v); Wire.endTransmission(); } void readTouchInputs(){ if(!digitalRead(4)){ //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 Wire.requestFrom(0x5B,2); LSB = Wire.read(); MSB = Wire.read(); uint16_t touched2 = ((MSB << 8) | LSB); //16bits that make up the touch states Wire.requestFrom(0x5C,2); LSB = Wire.read(); MSB = Wire.read(); uint16_t touched3 = ((MSB << 8) | LSB); //16bits that make up the touch states Wire.requestFrom(0x5D,2); LSB = Wire.read(); MSB = Wire.read(); uint16_t touched4 = ((MSB << 8) | LSB); //16bits that make up the touch states /// 0 TO 11 for (int i=0; i < 12; i++){ // Check what electrodes were pressed if(touched & (1<<i)){ if(touchStates[i] == 0){ //pin i was just touched //Serial.print("pin "); //Serial.print(i); //Serial.println(" was just touched"); digitalWrite(1, 1); }else if(touchStates[i] == 1){ //pin i is still being touched } touchStates[i] = 1; }else{ if(touchStates[i] == 1){ //Serial.print("pin "); //Serial.print(i); //Serial.println(" is no longer being touched"); digitalWrite(1, 0); //pin i is no longer being touched } touchStates[i] = 0; } } /// 12 TO 23 for (int i=0; i < 12; i++){ // Check what electrodes were pressed if(touched2 & (1<<i)){ if(touchStates[i+12] == 0){ //pin i was just touched //Serial.print("pin "); //Serial.print(i); //Serial.println(" was just touched"); digitalWrite(1, 1); }else if(touchStates[i] == 1){ //pin i is still being touched } touchStates[i+12] = 1; }else{ if(touchStates[i+12] == 1){ //Serial.print("pin "); //Serial.print(i); //Serial.println(" is no longer being touched"); digitalWrite(1, 0); //pin i is no longer being touched } touchStates[i+12] = 0; } } // 24 TO 35 for (int i=0; i < 12; i++){ // Check what electrodes were pressed if(touched3 & (1<<i)){ if(touchStates[i+24] == 0){ //pin i was just touched //Serial.print("pin "); //Serial.print(i); //Serial.println(" was just touched"); digitalWrite(1, 1); }else if(touchStates[i] == 1){ //pin i is still being touched } touchStates[i+24] = 1; }else{ if(touchStates[i+24] == 1){ //Serial.print("pin "); //Serial.print(i); //Serial.println(" is no longer being touched"); digitalWrite(1, 0); //pin i is no longer being touched } touchStates[i+24] = 0; } } // 36 TO 47 for (int i=0; i < 12; i++){ // Check what electrodes were pressed if(touched4 & (1<<i)){ if(touchStates[i+36] == 0){ //pin i was just touched //Serial.print("pin "); //Serial.print(i); //Serial.println(" was just touched"); digitalWrite(1, 1); }else if(touchStates[i] == 1){ //pin i is still being touched } touchStates[i+36] = 1; }else{ if(touchStates[i+36] == 1){ //Serial.print("pin "); //Serial.print(i); //Serial.println(" is no longer being touched"); digitalWrite(1, 0); //pin i is no longer being touched } touchStates[i+36] = 0; } } } }

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