Created
January 21, 2016 11:43
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Measures the speed of a ping pong ball using two photoresistors.
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/* Measures the speed of a ping pong ball using the distance | |
between two photoresistors and millis() */ | |
int sensor1Value; | |
int sensor2Value; | |
double startTime; | |
double endTime; | |
double time; | |
double timeInSeconds; | |
double distance; | |
double speed; | |
boolean endFlag; | |
void setup() { | |
Serial.begin(9600); | |
distance = 6; | |
endFlag = false; | |
} | |
void loop() { | |
sensor1Value = analogRead(A0); | |
sensor2Value = analogRead(A1); | |
//Serial.println(sensor1Value); // Used for determining photoresistor thresholds | |
//Serial.println(sensor2Value); | |
if(sensor1Value > 800){ // If first photoresistor passes threshold, save startTime. | |
endFlag = false; | |
startTime = millis(); | |
} | |
if(sensor2Value < 830 && endFlag == false){ // If second photoresistor passes threshold, save endTime. | |
endTime = millis(); | |
time = endTime - startTime; | |
timeInSeconds = time/1000; | |
speed = distance/timeInSeconds; | |
Serial.print("Speed: "); | |
Serial.print(speed); | |
Serial.print(" cm/s"); | |
Serial.println(" "); | |
endFlag = true; | |
} | |
} |
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