Difference between revisions of "Light intensity data collection"

Objective

This tutorial will display the light intensity data in Processing with a curve which measured by the TSL2561 sensor.

Equipment

• Microduino-Core
• Microduino-FT232R
• Microduino-Weatherstation
• Other equipment
  • USB cable one
  • Bread one
  • Breadboard Jumper one box

Schematic

Use Microduino-Weatherstation's TSL2561 sensor schematic.

Program

Refers to LightDataCollection

LightDataCollectionArduino

Debug

Step 1: Set up hardware system, as follows:

Step 2: Explain the code:

This example needs two parts code, one is Processing and the other is Microduino.

Microduino:

//Get the light intensity data and output to serial for Processing's display.

 void loop()
 {
   sensors_event_t event;
   tsl.getEvent(&event);
   /* Display the results (light is measured in lux) */
   if (event.light) {
     sensor_lux=event.light;
     Serial.println(sensor_lux);
   }
   delay(100);
 }

Processing:

//Get the the first serial data, // is always my Arduino, so I open Serial.list()[0]. // Open whatever port is the one you're using.

 myPort = new Serial(this, Serial.list()[0], 9600);
 myPort.bufferUntil('\n'); // Trigger a SerialEvent on new line

//Use the curve to display the data that Microduino sent and mark the table scale

 void draw() {
   background(255);
   // Draw lines connecting all points
   for (int i = 0; i < vals.length-1; i++) {
     stroke(0);
     strokeWeight(1);
     line(i, vals[i], i+1, vals[i+1]);
   }
   // Slide everything down in the array
   for (int i = 0; i < vals.length-1; i++) {
     vals[i] = vals[i+1];
   }
   String val = myPort.readStringUntil('\n');
   if (val != null) {
     val = trim(val);
     println(val);
     lux=Float.parseFloat(val);
   }
   vals[vals.length-1] = 200-lux;
   //Display scale
   text ( "200-", 370, 10); 
   text ( "--", 370, 50); 
   text ( "100-", 370, 100);
   text ( "--", 370, 150); 
   text ( "0-", 370, 200); 
   //show current num
   text ( lux+"LUX", 0, 10);
 }

Step 3: Compile the code and download it.

Step 4: After running the program, find a light source sloshing around the sensor, and see if the screen can show the light intensity data.

Result

Screen will display the light intensity curve, as follows:

Video