Using multiple pings sensors
Hello all, I was pondering on how to configure multiple pings sensors. If I mount 4 ping sensors on all 4 sides of my bot, could I use one trigger signal for all 4 sensors with 4 separate returns to the ez-b. In other words, 4 pings using 5 I/O's instead of 4 pings and 8 I/O's. The main issue is the ping sensors the DJ uses are 4 pin, one trigger and one return and they are about $3.00 US on EBay. I have been using the parallax ping sensor that has 3 pins. The Parallax sensor is $30.00 US. The 4 pin is cheaper, but uses more I/O's. I am just trying to get the biggest bang for my buck and save on I/O pins. any ideas???
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The way an ultrasonic distance sensor works is by the time between the trigger and echo signal at the speed of sound. Each function call for the distance of a sensor is determined on a per sensor basis. So they would need to be seperate calls for each sensor - therefore seperate I/O's.