Sample lesson
You need:
iTriangle MASTER online, buzzer, LED display, 2 in 1 humidity and temperature sensor, light sensor
|
|
|
|
|
| Buzzer | LED display | 2 in 1 humidity and temperature sensor | Light sensor |
Introduction:
Light is the visible part of the spectrum of the electromagnetic radiation that surrounds us. Light is characterized mainly by colour and intensity, which depends directly on the light source. Light intensity is a physical quantity denoted by E and expresses the amount of light (luminous flux) falling on a surface. Its unit is lux (lx). The differences in light across Europe can be somewhere around 0.5 lx at night and up to 70,000 lx during the day. To measure the whole available spectrum, light sensors would need an enormous range. For this reason, the light sensor in this kit is set for much lower spectrum, as it is more accurate in lower light settings.
Task:
Find out how the intensity of incident light changes depending on the light source, the distance from the light source and type of filters placed between the sensor and light source.
Tutorial:
- Construct a simple stand with iTriangle online and connect the sensors and components as pictured below. Connect iTriangle online and upgrade its firmware by following these steps.
- Choose a light source and different types of filters.
- Start the program.
- Measured light values will be shown on the display. The display also shows measurements from the 2 in 1 humidity and temperature sensor. You can look at other lessons to see how to use the 2 in 1 sensor.
- Try different types of filters and place them at different distances from the light sensor (e.g., white or coloured paper, colourful plastics, glass, sun glasses or a glass alternately filled with liquids of different colours. You can also discover the different beam angles of various light sources (diodes, LED light bulbs, incandescent light bulbs, candles or similar).
Measurements on LED display:
Temp – temperature in °C
Humid – relative humidity in %
Lumin –- luminescence measured in a relative scale
The online block programming is set up to measure the temperature, relative humidity and light levels 50 times and show the values on the LED display.
The Arduino program also continuously measures temperature, relative humidity and light and writes values to the display. According to the amount of incident light, the buzzer will simultaneously play (or not play) different tones. If you reduce the amount of light to the sensor, the tones will also reduce. You can create a melody by moving the sensor between darker and lighter areas of illumination. Try using different light sources.
Technical notes:
Žádné komentáře