How To Build a Cricket Car

Parts needed: 
a. Robot chassis
b. Wheels (x2)
c. Pen holders (x2)
d. Ball caster with metal ball
e. Pen nuts (x2)
f. Pen spacers (x2)
g. Pen screws (x2)
h. Gearmotor bracket with nuts and screws (x2)
i. 2-prong housings (x2)
j. White Cricket jumpers (x2)
k. Micro metal gearmotors (x2)
l. plastic standoffs with hex nuts (x4)

Tools needed (not pictured):
Soldering iron
Solder
Small Phillips-head screwdriver

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 NOTE: In the photo above, the 2-prong housings, white Cricket jumpers, and micro metal gearmotors are already connected. They come separate, but the first step of this guide tells you how to connect/solder them.

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Start by stripping about half an inch of wire from the jumpers. Do not strip the end of the wire that has the cricket jumper. Wrap the exposed wires around themselves to make one solid wire. Bend the exposed wire so that it can be hooked through the DC motor’s wire hooks.

Place one of the wires on each side of the micro metal gearmotor. Hook them completely around and wrap them around the tabs. Apply solder to each tab. Completely cover the hole inside the wire tabs so the connection is secured. Next is to take the other ends of the both wires, the jumpers, and attach them to the 2-prong housing. The orientation of the jumper is very important.

The jumper has a tiny tab on one side; you might not be able to see it clearly but you can feel it with your finger. When plugging it in, the tab must be facing the side of the housing with the tiny opening. When placed in, you should feel a light “click” and if it has been put in correctly then you will not be able to take it out. If it is easily removable you have either placed it in incorrectly or not pushed it in far enough.

 

Repeat the previous steps for the second motor.

 

Take the two gearmotor brackets and drop one nut into each hexagonal opening.

 

Place the brackets over each motor.

Attach the wheels to each motor. Next you’ll need the 4 screws that come with the brackets, the robot chassis, and the two beige risers that come with the chassis. Place the risers as shown in the picture above, place the motors and brackets on top, slide the screws through holes on the opposite side of the chassis. Tighten the screws with a small Phillips-head screwdriver into the nuts inside of the brackets.

Motors, brackets, risers, nuts, and screws attached.

Make sure the vertical ordering of each part is as shown above.

 

Take the plastic standoffs and place one in each of the holes pointed out above (in red). Place one of the accompanying nuts on the opposite side of the chassis to each post. Tighten with fingers.

How your car should look:
(left) Top of car with posts, (right) bottom of car with nuts.

Now you’ll need the remaining components for the pen holder/ball caster: pen screws, pen nuts, pen spacers, ball caster, and the pen holders. The holes on the chassis that this component is attached to are shown in the above picture in red.

Place the screws through both holes on the ball caster, then the bottom pen holder (should have no text on it), then the pen spacers, then the top pen holder (should read “T” or “TOP” on it), then through the two holes, and then hand-tighten the pen nuts onto the screw. It should look like the above picture.

And you’re done! Cricket car building complete. Now just add a Cricket and start programming your mobile robot!