Sensor 2 on Line Follower not working on ~30% of robots


#1

We have 25 robots at our school, an increasing number of them are having trouble with sensor 2. In all tests sensor 1 behaves as expected, sensor 2 often doesn’t pick up the same white surface at all or it needs to be closer to the white surface to work properly. The dodgiest ones need a white surface to be ~3-5mm away to work.

What we have tested:
Different surfaces
Replacing batteries
With USB cable plugged in
Different ambient lighting
Upgrading firmware
Resetting Default Program
Cleaning the sensor (with air and cloth)

About 7 of them are having the same issue atm.


#2

Hi Jensen,

Thanks for all your info!
We will pay high attention to your feedback about the issue on the line follower sensors and make improvement.

As for the 7 faulty sensors, where did you buy them? You can contact the shop where you bought the robot to check the warranty and ask for replacement sensors if they are under the warranty period.

If there is any problem, feel free to send email to daisy@makeblock.com.