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en:iot-open:hardware2:sensors_optical [2023/10/02 20:29] – pczekalskien:iot-open:hardware2:sensors_optical [2023/11/23 10:38] (current) – pczekalski
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-==== Optical Sensors ==== +====== Optical Sensors ====== 
- +{{:en:iot-open:czapka_b.png?50| General audience classification icon }}{{:en:iot-open:czapka_e.png?50| General audience classification icon }}\\ 
-===Optocoupler===+== Optocoupler ==
  
 An optocoupler is a device that combines light-emitting and receiving devices in one package. Mainly, it combines the infrared light-emitting diode (LED) and a phototransistor.\\ An optocoupler is a device that combines light-emitting and receiving devices in one package. Mainly, it combines the infrared light-emitting diode (LED) and a phototransistor.\\
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 An example code: An example code:
 <code c> <code c>
-int optoPin = A0; //Initialize an analogue A0 pin for optocoupler +int optoPin = A0;   //Initialize an analogue A0 pin for optocoupler 
-int optoReading; //The analogue value reading from the optocoupler+int optoReading;    //The analogue value reading from the optocoupler
  
 int objecttreshold = 1000; //Object threshold definition int objecttreshold = 1000; //Object threshold definition
-int whitetreshold = 150; //White colour threshold definition+int whitetreshold = 150;   //White colour threshold definition
  
 void setup ()  void setup () 
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 </code> </code>
  
-===Colour Sensor===+== Colour Sensor ==
 This type of sensor gives information about the colour of the light illuminating the sensor surface. Because computers often use RGB (red, green, blue) colour schemes, the sensor returns three values representing the intensity of three components. Colour sensors usually contain white LEDs to illuminate the surface, which colour should be distinguished by them. The colour sensor uses an SPI or TWI interface to send readings. Some models of colour sensors include an additional gesture detector which recognises simple gestures (up, down, left, right).\\ This type of sensor gives information about the colour of the light illuminating the sensor surface. Because computers often use RGB (red, green, blue) colour schemes, the sensor returns three values representing the intensity of three components. Colour sensors usually contain white LEDs to illuminate the surface, which colour should be distinguished by them. The colour sensor uses an SPI or TWI interface to send readings. Some models of colour sensors include an additional gesture detector which recognises simple gestures (up, down, left, right).\\
 The sample device is present in figure {{ref>tcs1}} and the connection circuit in figure {{ref>tcs2}}.  The sample device is present in figure {{ref>tcs1}} and the connection circuit in figure {{ref>tcs2}}. 
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 <caption>TCS34725 RGB colour sensor module</caption> <caption>TCS34725 RGB colour sensor module</caption>
 </figure> </figure>
-<todo @pczekalski>add schematic, replace image</todo> 
  
 <figure tcs2> <figure tcs2>
-{{ :en:iot-open:hardware2:tcs34725_schematic.png?200 | }}+{{ :en:iot-open:hardware2:tcs34725_schematic.png?200 | Connection of the TCS34725 and microcontroller}}
 <caption>Connection of the TCS34725 and microcontroller</caption> <caption>Connection of the TCS34725 and microcontroller</caption>
 </figure> </figure>
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 void setup(void) { void setup(void) {
   Serial.begin(9600);   Serial.begin(9600);
-  Wire.begin(5,4); //SCL SDA +  Wire.begin(5,4);           //SCL SDA 
-  pinMode(21, OUTPUT);  //Pin 21 controls LED +  pinMode(21, OUTPUT);       //Pin 21 controls LED 
-  digitalWrite(21,LOW); //Turn off onboard LED+  digitalWrite(21,LOW);      //Turn off onboard LED
   if (rgb_sensor.begin()) {  //Initialise RGB sensor   if (rgb_sensor.begin()) {  //Initialise RGB sensor
     Serial.println("RGB sensor present");     Serial.println("RGB sensor present");
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   uint16_t r, g, b, unfiltered, lux;   uint16_t r, g, b, unfiltered, lux;
  
-  rgb_sensor.getRawData(&r, &g, &b, &unfiltered);   //read RGB and unfiltered light intensity +  rgb_sensor.getRawData(&r, &g, &b, &unfiltered);    
-  lux = rgb_sensor.calculateLux(r, g, b);  //calculate illuminance in Lux+                             //read RGB and unfiltered light intensity 
 +  lux = rgb_sensor.calculateLux(r, g, b);   
 +                             //calculate illuminance in Lux
  
   Serial.print("Lux: ");     //print calculated Lux value   Serial.print("Lux: ");     //print calculated Lux value
en/iot-open/hardware2/sensors_optical.1696278583.txt.gz · Last modified: 2023/10/02 20:29 by pczekalski
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