I'm thinking this is because the voltage on USB port must be less than 5V?
Could be a number of things - how you're measuring the distance, speed of sound where you are...
Try using the pulse output instead.
I'm thinking this is because the voltage on USB port must be less than 5V?
Could be a number of things - how you're measuring the distance, speed of sound where you are...
Try using the pulse output instead.