I am wondering whether or not it is possible to use an Arduino ultrasonic sensor in a closed box (30 cm x 30 cm.)
I have been told that the walls will cause the signal to bounce all over the place and the sensor will get messed up, but I am not sure if this is accurate. Please let me know if this is possible.
Also, if ultrasonic sensors don't work, I believe the best alternative would be a laser sensor.
Unfortunately, I noticed that laser sensors require SDA and SCL pins. My ATmega64 microcontroller only has one of each of these pin types, yet I need three laser sensors. Is there any workaround for this problem?