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SubSystem : IP2

Task Title:
Investigating Switches
Name: Switch Triggers
(+ going)


OnTrack
equipment you will need:

IP2, OP1 Modules
Bridge Power Base
Component Card
2 x 2mm White Leads
2 x Crocodile Leads
Tilt, Reed, Micro
Switches


Connecting Subsystems:

1, Place the IP2 and OP1 modules onto the Bridge Power Base (Fig 2.2). Connect up the "OnTrack" module to hold these down.

2, Use two white leads (shown black in fig.2.2) to connect module OP1 to the fixed tone piezo sounder.

3, Connect the two crocodile leads, as shown, so that other switches can be used (they are in parallel with the push switch).

4, Have the external switches ready but don't connect them yet.

5, Check your wiring is accurate and then connect the 9 volt power supply.

Testing and Investigating:

Don't forget to write up your method and results afterwards.

6, Press the push switch to complete the circuit - the buzzer should sound.


Connecting up further circuits

7, Connect the Reed (magnetic) switch now. How close does the magnet need to be and how is it positioned to operate the buzzer? Measure and record your results. How might this type of switch be useful when designing and making board games? Can you think of an advantage it has over other switches?

8, Now connect the tilt switch to the crocodile clips. How should you position it to turn the buzzer on and off? - Draw diagrams to show what angle it has turned through.

9, Connect up the micro switch as a push to make type using its black and white cables. What cables do you need to use to make it a push to break switch?

10, The reed, push switch and tilt switches are known as Single Pole Single Throw (S.P.S.T.). Use this link to find out their circuit symbols and write them up.

11, The micro switch is a Single Pole Double Throw (S.P.D.T.) type as it has three connections. You should be able to find its symbol too.

12, Find out how a "membrane panel" switch can be made - you could try making one and testing it using this equipment.