You can make a long caster to prevent the front to tilt.
Motor grip More information The shaft of the motor is the rim and the heatshrink is the tire. Since the robot rests on the shaft of the motor to move around, you will need some grip. Option 1: You will need to shrink the heatshrink onto the motor shaft. We can use a heat gun, a lighter or the tip of your soldering iron.
4.- Soldering elements: SPDT Switches Soldering the SPDT switches I (1. NC with NC and 2. NO with NO) Soldering the SPDT switches II (3. C with Motor and4. C with Motor)
Soldering the SPDT switches III (5. (+) battery holder with NC and 6. (-) battery holder with NO) On your AA battery holder you have a red and a black wire. The red wire is positive ( + ) and the black is negative ( - ).
7.- Motor with Switch and 8. Motor with Switch. 9.- Switch with battery holder.
Solder the wire like on the picture and everything is ready to be tested.
Put some battery in it (3 AA batteries) Both motors should turn. By pressing theleft SPDT switch theleft motor should turn the other way. By pressing theright SPDT switch theright motor should turn the other way.