I am having issues with my student's ultrasonic sensor.


The robot always shows very erratic readings, even though it is not moving, or is moving very slowly. Below is a link to see what I mean.

https://youtu.be/sx78SSwGnVg

Please help.

Double-check your motors and sensors setup. Look at the pragmas created by the software. Are you sure the ultrasonic sensor is connected to that port? Is the cable plugged in securely to the sensor and the VEX brick?

Im fairly certain everything is securely connected. This problem is occurring in my other robots as well. I am a teacher and this issue is happening with my student's robots. I am thinking it is something with the hardware since this is the only sensor that is having the issue, it just happens to be an important sensor.

Can you post the code (program) that you're using?

1. Set multiple motors (-20, leftmotor, rightmotor)
2. Waituntil Distance sensor < 100
3. Stop all motors

Can you post the actual RobotC code? (include the pragmas)