arduino and breadboard wired together

Multiple Shift Registers Test

In the last post, we successfully got a laser/sensor pair working¬†with the laser tripwire test. This is great, but my design calls for 72 of these tripwires (36 on the X-axis and 36 on the Y-axis). Unfortunately, the Arduino Uno only has 14 digital input/output pins. So we need to find a way to read signals from 72 phototransistors with only 14 IO pins to work with. In this post, we’ll be testing a method of reading many inputs with just a few Digital Input pins.

laser tripwire with arduino

Laser Tripwire Experiment with Phototransistor

The first step toward building my tennis ball sensing board was to test the simplest iteration of the sensor concept: A single laser/sensor combo, that is tripped when an object passes between them, blocking the laser beam. Will an object breaking this beam cause enough of a drop in the phototransistor’s reading to create a digital signal that we can feed into a microprocessor?

arduino, sketches and calculations

Throw: Active Art Project

Simply put, throw is a project that will consist of a wooden board equipped with laser sensors to determine where objects thrown at the board make contact. It will be connected to a micro-controller and computer to read input and create digital imagery.