Description
Infrared Speed Motor Sensor
A small sensor for measuring motor speed or other objects that can pass through the detectors slots. Each time an object blocks the light from passing from one side of the slot to the other, a pulse is produced at the output. The output signal is pre-conditioned using a comparator to provide a clean low or high signal.
Infrared Speed Motor Sensor Spec
* Reader opening: 10(h) x 12.5(w) mm
* Supply voltage: 3.3 – 5V
* Output: Low or High
* Dimensions: 23 x 20mm
* Mounting holes ø3.2mm, c-c 14mm
Example Sketch & Diagram
Code
/* Connection for Uno or other 328-based platforms: left wheel encoder (DO) -> Digital pin 2 right wheel encoder (DO) -> Digital pin 3 */
#define LEFT 0
#define RIGHT 1
long coder[2] = {0,0};
int lastSpeed[2] = {0,0};
void setup(){
Serial.begin(9600);
attachInterrupt(LEFT, LwheelSpeed, CHANGE);
attachInterrupt(RIGHT, RwheelSpeed, CHANGE);
}
void loop(){
static unsigned long timer = 0;
if(millis() - timer > 100){
Serial.print("Coder value: ");
Serial.print(coder[LEFT]);
Serial.print("[Left Wheel] ");
Serial.print(coder[RIGHT]);
Serial.println("[Right Wheel]");
lastSpeed[LEFT] = coder[LEFT];
lastSpeed[RIGHT] = coder[RIGHT];
coder[LEFT] = 0;
coder[RIGHT] = 0;
timer = millis();
}
}
void LwheelSpeed(){
coder[LEFT] ++;
}
void RwheelSpeed(){
coder[RIGHT] ++;
}
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