88 lines
2.6 KiB
Arduino
88 lines
2.6 KiB
Arduino
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#define INPUTS 8
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byte touchOut=0; //binary encoded sensors
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uint16_t rawIn[INPUTS];
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uint16_t countedLow[INPUTS]; //count the times input was below threshold (touched)
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#define TOUCHTHRESHOLD 300 //below which value input counts as touched
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#define COUNTEDLOWTHRESHOLD 10 //how many times input has to be sampled as low in a row to count as real touch.
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// Inputdelay is given by: COUNTEDLOWTHRESHOLD*ADCREADINTERVAL
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long last_adcmicros=0;
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#define ADCREADINTERVAL 2000 //in microseconds. interval to read all adc values
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boolean inputchangeFlag; //flag to update keypress
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long last_send=0;
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#define MINIMUMSENDDELAY 10 //in milliseconds. minimum delay between serial sends
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void setup() {
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pinMode(A0, INPUT_PULLUP);
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pinMode(A1, INPUT);
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pinMode(A2, INPUT_PULLUP);
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pinMode(A3, INPUT_PULLUP);
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pinMode(A4, INPUT_PULLUP);
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pinMode(A5, INPUT_PULLUP);
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pinMode(A6, INPUT_PULLUP);
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pinMode(A7, INPUT_PULLUP);
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Serial.begin(115200);
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}
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void loop() {
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long loopmillis=millis();
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// ## Sampling and Touch Filtering ##
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if (micros()-last_adcmicros>=ADCREADINTERVAL)
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{
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last_adcmicros=micros();
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//Sample all analog Inputs
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rawIn[0]=analogRead(A0);
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rawIn[1]=analogRead(A1);
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rawIn[2]=analogRead(A2);
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rawIn[3]=analogRead(A3);
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rawIn[4]=analogRead(A4);
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rawIn[5]=analogRead(A5);
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rawIn[6]=analogRead(A6);
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rawIn[7]=analogRead(A7);
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//Serial.print(analogRead(A1));
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//Serial.print(": ");
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//Serial.println(micros()-mic);
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for (uint8_t i=0;i<INPUTS;i++){ //for all inputs
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if (rawIn[i]<=TOUCHTHRESHOLD) { //touch detected (input low at this sample)
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countedLow[i]++; //increase counter
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if (countedLow[i]>=COUNTEDLOWTHRESHOLD) { //upper limit
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countedLow[i]=COUNTEDLOWTHRESHOLD; //upper limit. prevent overflow
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inputchangeFlag=true; //flag to update keypress
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}
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}else{ //released or not pressed hard enough
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countedLow[i]=0; //reset counter
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inputchangeFlag=true; //flag to update keypress
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}
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}
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}
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// ## Send to Raspberry ##
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if (inputchangeFlag) { //something changed
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if (loopmillis-last_send>MINIMUMSENDDELAY) //delay between last send long enough
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{
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touchOut = 0; //reset bits
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for (uint8_t i=0;i<INPUTS;i++){ //for all keys
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if (countedLow[i]>=COUNTEDLOWTHRESHOLD) { //key pressed/touched
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touchOut^=1<<i;
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//Serial.print("1");
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}//else{
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//Serial.print("0");
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//}
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}
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//Serial.println(touchOut, BIN);
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//Serial.println();
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Serial.write(touchOut);
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last_send=loopmillis;
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inputchangeFlag=false; //clear Flag
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}
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}
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}
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