Hi Folks,
I’m looking for advice/guidance on converting/replacing the timer in the code below with the appropriate timer for Xiao SAMD21. The elapsedMillis is specific to the MCU I’ve been using. I’d like to bring this code to the Xiao if possible. ?
const int thresholdMin = 12; // minimum reading, avoid "noise"
const int aftershockMillis = 60; // time of aftershocks & vibration
int state=0; // 0=idle, 1=looking for peak, 2=ignore aftershocks
int peak; // remember the highest reading
elapsedMillis msec; // timer to end states 1 and 2
void setup() {
Serial.begin(115200);
//pinMode(A0, INPUT_DISABLE);
while (!Serial && millis() < 2500) /* wait for serial monitor */ ;
Serial.println("Piezo Peak Capture");
}
void loop() {
int piezo = analogRead(A10);
if (state == 0) {
// IDLE state: if any reading is above a threshold, begin peak
if (piezo > thresholdMin) {
//Serial.println("begin state 1");
state = 1;
peak = piezo;
msec = 0;
}
} else if (state == 1) {
// Peak Tracking state: for 10 ms, capture largest reading
if (piezo > peak) {
peak = piezo;
}
if (msec >= 10) {
Serial.print("peak = ");
Serial.println(peak);
//Serial.println("begin state 2");
state = 2;
msec = 0;
}
} else {
// Ignore Aftershock state: wait for things to be quiet again
if (piezo > thresholdMin) {
msec = 0; // keep resetting timer if above threshold
} else if (msec > 30) {
//Serial.println("begin state 0");
state = 0; // go back to idle after 30 ms below threshold
}
}
}
PJ
the SleepyDog library works with the SAMD21: 