The basic principle of a light alarm is to measure any changes in the light levels. If the level goes above or below a certain level, something is triggered.
I like this because it teaches variables and responding to a change in that variable.
FOREVER measure the light level
IF the level changes, do something.
You can even use the > and < signs to extend it. The circuit is very simple – a light dependant resistor, 10k resistor , 3 wires and an Arduino. You can add more OUTPUTS or use Scratch on screen to do something.
This is an example of Scratch reacting – by 10 and 11 year olds.
This is an Arduino robot. Pupils make their own robots using the motors,sensors and wheels provided. They use Scratch for Arduino to program the robots and to make them function. The robots can be pre- programmed to carry out a routine or can be operated wirelessly using the Raspberry Pi.
Pupils are able to take advantage of a wide range of sensors and outputs.
We can teach your pupils to work with a whole range of sensors. Essentially a sensor works by applying power to it. A signal goes to the microcontroller telling you the value of the sensor. As the sensor changes, the signal value changes.
We can teach how to read that signal and to make the outputs or Scratch react as you want.
Sensors available include
Infra – red heat (like a burglar system)
Light breaker – break the light beam and the system senses it.
Force – a weight measure
Pulse sensor – reacts to the heart beat
Liquid level measure
ID tag sensor
Sensors can easily be integrated into any system. Pupils can write a program that allows the system to respond as you want and as to where the imagination takes them.