I received the following error message when I tried to upload the Pulse Sensor Amped code from this website (https://github.com/WorldFamousElectronics/PulseSensor_Amped_Arduino/blob/master/PulseSensorAmped_Arduino_1dot4/Interrupt.ino) to my Arduino Uno:
Arduino: 1.6.7 (Windows 7), Board: "Arduino/Genuino Uno"
C:\Users\Owner\Documents\Arduino\ISR_PulseSensor\ISR_PulseSensor.ino: In function 'void setup()':
ISR_PulseSensor:24: error: a function-definition is not allowed here before '{' token
void interruptSetup(){
^
In file included from C:\Program Files (x86)\Arduino\hardware\arduino\avr\cores\arduino/Arduino.h:30:0,
from sketch\ISR_PulseSensor.ino.cpp:1:
ISR_PulseSensor:36: error: expected unqualified-id before string constant
ISR(TIMER2_COMPA_vect){ // triggered when Timer2 counts to 124
^
ISR_PulseSensor:36: error: a function-definition is not allowed here before '{' token
ISR(TIMER2_COMPA_vect){ // triggered when Timer2 counts to 124
^
ISR_PulseSensor:117: error: expected '}' at end of input
}
^
exit status 1
a function-definition is not allowed here before '{' token
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ISR(TIMER2_COMPA_vect){ // triggered when Timer2 counts to 124
Here is the code in its entirety:
int pulsePin = 0;
int blinkPin = 13;
volatile int rate[10]; // array to hold last ten IBI values
volatile unsigned long sampleCounter = 0; // used to determine pulse timing
volatile unsigned long lastBeatTime = 0; // used to find IBI
volatile int P =512; // used to find peak in pulse wave, seeded
volatile int T = 512; // used to find trough in pulse wave, seeded
volatile int thresh = 525; // used to find instant moment of heart beat, seeded
volatile int amp = 100; // used to hold amplitude of pulse waveform, seeded
volatile boolean firstBeat = true; // used to seed rate array so we startup with reasonable BPM
volatile boolean secondBeat = false; // used to seed rate array so we startup with reasonable BPM
volatile int BPM;
volatile int Signal;
volatile int IBI = 600;
volatile boolean Pulse = false;
volatile boolean QS = false;
void setup(){
pinMode(13,OUTPUT);
void interruptSetup(){
// Initializes Timer2 to throw an interrupt every 2mS. (CTC mode: clear Timer on compare match)
TCCR2A = 0x02; // DISABLE PWM ON DIGITAL PINS 3 AND 11, AND GO INTO CTC MODE (Timer/Counter Control Register: the prescaler can be configured here)
TCCR2B = 0x06; // DON'T FORCE COMPARE, 256 PRESCALER (Timer/Counter Control Register: the prescaler can be configued here)
OCR2A = 0X7C; // SET THE TOP OF THE COUNT TO 124 FOR 500Hz SAMPLE RATE (Output Compare Register: Timer2 output compare register A)
TIMSK2 = 0x02; // ENABLE INTERRUPT ON MATCH BETWEEN TIMER2 AND OCR2A (Timer1/Counter Interrupt Mask Register: to enable/disable timer interrupts)
sei(); // MAKE SURE GLOBAL INTERRUPTS ARE ENABLED
}
// THIS IS THE TIMER 2 INTERRUPT SERVICE ROUTINE.
// Timer 2 makes sure that we take a reading every 2 miliseconds
ISR(TIMER2_COMPA_vect){ // triggered when Timer2 counts to 124
cli(); // disable interrupts while we do this
Signal = analogRead(pulsePin); // read the Pulse Sensor
sampleCounter += 2; // keep track of the time in mS with this variable
int N = sampleCounter - lastBeatTime; // monitor the time since the last beat to avoid noise
// find the peak and trough of the pulse wave
if(Signal < thresh && N > (IBI/5)*3){ // avoid dichrotic noise by waiting 3/5 of last IBI
if (Signal < T){ // T is the trough
T = Signal; // keep track of lowest point in pulse wave
}
}
if(Signal > thresh && Signal > P){ // thresh condition helps avoid noise
P = Signal; // P is the peak
} // keep track of highest point in pulse wave
// NOW IT'S TIME TO LOOK FOR THE HEART BEAT
// signal surges up in value every time there is a pulse
if (N > 250){ // avoid high frequency noise
if ( (Signal > thresh) && (Pulse == false) && (N > (IBI/5)*3) ){
Pulse = true; // set the Pulse flag when we think there is a pulse
digitalWrite(blinkPin,HIGH); // turn on pin 13 LED
IBI = sampleCounter - lastBeatTime; // measure time between beats in mS
lastBeatTime = sampleCounter; // keep track of time for next pulse
if(secondBeat){ // if this is the second beat, if secondBeat == TRUE
secondBeat = false; // clear secondBeat flag
for(int i=0; i<=9; i++){ // seed the running total to get a realisitic BPM at startup
rate = IBI;
}
}
if(firstBeat){ // if it's the first time we found a beat, if firstBeat == TRUE
firstBeat = false; // clear firstBeat flag
secondBeat = true; // set the second beat flag
sei(); // enable interrupts again
return; // IBI value is unreliable so discard it
}
// keep a running total of the last 10 IBI values
word runningTotal = 0; // clear the runningTotal variable
for(int i=0; i<=8; i++){ // shift data in the rate array
rate = rate[i+1]; // and drop the oldest IBI value
runningTotal += rate; // add up the 9 oldest IBI values
}
rate[9] = IBI; // add the latest IBI to the rate array
runningTotal += rate[9]; // add the latest IBI to runningTotal
runningTotal /= 10; // average the last 10 IBI values
BPM = 60000/runningTotal; // how many beats can fit into a minute? that's BPM!
QS = true; // set Quantified Self flag
// QS FLAG IS NOT CLEARED INSIDE THIS ISR
}
}
if (Signal < thresh && Pulse == true){ // when the values are going down, the beat is over
digitalWrite(blinkPin,LOW); // turn off pin 13 LED
Pulse = false; // reset the Pulse flag so we can do it again
amp = P - T; // get amplitude of the pulse wave
thresh = amp/2 + T; // set thresh at 50% of the amplitude
P = thresh; // reset these for next time
T = thresh;
}
if (N > 2500){ // if 2.5 seconds go by without a beat
thresh = 512; // set thresh default
P = 512; // set P default
T = 512; // set T default
lastBeatTime = sampleCounter; // bring the lastBeatTime up to date
firstBeat = true; // set these to avoid noise
secondBeat = false; // when we get the heartbeat back
}
sei(); // enable interrupts when youre done!
}// end isr
void loop (){
}
}
Right now, I am just trying to get the pin 13 LED to blink in accordance with my heart beat. Once I am able to do that, then I will manipulate some of the volatile variables in my loop() function. Any advice that anyone could offer as to what the problem is would be greatly appreciated. I have posted in the pulsesensor.com website, but I am unfortunately getting no replies.