Day 6 - Alex's Journal

Today we started work on a filtering program to get rid of noise from the sensors. Normally, the unfiltered signal from the photodiodes is not a clean signal; it sometimes picks up small bits of light which trigger the sensor for only a fraction of a second. A clean (filtered) signal should look like this (low meaning off, high meaning on): ____----____----____. This signal shows that the diode starts off, then it picks up a light for a short time, then it goes off again, then it picks up another light, then it turns off again. However, the unfiltered signal we were getting looked more like this: __-__---_-____-_--_-____. As you can see, this is very unclean and it is difficult to determine what is occuring here. In order to fix this, we created a program which changes the second (unclean) signal into the first (clean) signal. It works very well, however, it causes a small delay between the input and the output.