This week we played around with different input sensors. Since two weeks ago I used a sonar sensor, which could eventually play a nice role in detecting collisions for my hovercraft, this week I chose to play with a pyroelectric sensor. In other words, a motion detector.
I wanted to create another board that exposes all the pins of the ATmega328p while allowing me an easy access for my brushless motors and servo. So I made it :)
Since this week is about input devices, I added a pyroelectric sensor to that board as well and now I have a safety mechanism that stops the motors every time a human being is about to touch the front part of the hovercraft. Safety comes first! these motors are super fast and dangerous.Tips & failures
I ended up printing two times the board before I got it to work. This first mistake was changing the PNG files which resulted in bad offsets. The second stupid mistake was me not noticing that I haven't changed the clearance to be 16mil and left it in its default 8mil state. That resulted with lines connected to each other. The worst case about it is that I could have seen it in the first board but I overlooked it :(. Each print took about an hour.
Jeff taught me how to etch a board which is a much faster process and supports smaller details. Unfortunately when I transferred the printed sketch onto the PCB I might have giggled it a bit and the sketch was ruined. Be careful when you iron the printing onto the board otherwise it will move.