Step 5
Construct a program to run the motor at 50% power for
5 seconds as follows. Drag commands from the list on
the left hand side of the screen and drop them into the
blank space on the right. Each command needs to
attach to the one above it. First drag ‘program start’
across. Then attach ‘motor 1 STOP’ to it. Click on
‘STOP’ and it will change to ‘FORWARD at 75%’. Click
on the ‘75’ and type in ‘50’. Attach ‘wait 1 seconds’,
then click on the ‘1’ and type in ‘5’. Attach ‘motor 1
STOP’ again to finish.
Step 6
Click on the green arrow (top left of the screen) to run your
program. Motor 1 LED on the Crumble should glow red for
5 seconds and then switch off. Save your program in the
Crumble folder – call it ‘Run motor’.
Step 7
If you have the 2xAA battery holder, tie the battery
snap wires in a reef knot as shown, so the metal ends
point away from each other and don’t accidentally
short circuit your battery by touching. Make a label for
your battery holder saying ‘Use ZINC cells not
alkaline’ and stick it on.
Step 8
Fit the cells into the battery holder (the right
way round). If you have the 2xAA battery
holder, stick it to the base. If you have the
3xAA battery holder, cut a 5cm square of
corrugated plastic with a 2.5cm square cut-
out. Tape this to the underside of the
battery box and then stick it to the base.
Step 9
Connect up the circuit shown on the right. If you have the 2xAA battery
holder, push the battery snap firmly onto the battery holder terminals. If you
have the 3xAA battery holder then switch on. Run the program (click on the
green arrow) and check the motor shaft turns for 5 seconds and then stops.