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Part III Ranger
Why the motors are not working properly as they should be
Situation 1 Motor(s) is not turning at all when command given.
Please check:
a. Make sure the wheels are installed correctly as there are wheels in different sizes.
b. Cable from motor to the main board is connected properly and make sure the cables are
working.
c. If the Makeblock App cannot let it move, try to write an online program or upload a program in
mBlock like below to test:
Remember to upgrade firmware before running an online program.
d. Check if there is anything get stuck in the wheels, like cables. You can turn the wheels in
clockwise or anti-clockwise order to test.
e. Try some new batteries.
f. It may not move if the speed is too slow like 20 or 30. So try speed at 200.
Situation 2 Ranger cannot move straightly (two motors have different speed)
Due to the motors’ installation difference, it is normal that two motors don’t have exactly same
speed. If they differ a lot, please check:
a. If there is anything get in the left or right wheel, like cables.
b. Speed is set too slow that one side moves a little while the other side doesn’t move. So try a
larger speed like 100.
c. Motors cannot get enough power energy. Try to change the battery or charge the battery.
If the speed of both sides still differs a lot, you may try to adjust the speed to with different power,
like setting left speed as 100, while right 110. Several tests are necessary to get expected result.
Situation 3 Ranger moves forward when I tap backward?
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