Here it is mounted on the chair directly. It is wireless!
This is the emitter on the chair. That is a barebone arduino.
And here is the receiver. The servo motor simply points to the fart intensity on the white sheet of paper.
Those are nRF2401A Transceiver with Chip Antenna (Sparkfun sku: WRL-00152). Pretty small and easy to use with the Arduino. There is a library for those modules.
I had a lot of fun playing with the MQ-4 methane sensor. The black thing around it is a protective sleeve that I ended up not using. Those suckers heat up and consume 175mA! There is a little heater inside. The moment gas is present, it evaporates and change the output voltages! Fun to use but hard to test… I always had a hard time to try to fart on that thing, I could not fart on command. It’s only when I disconnected the sensor and Arduino from my computer that I started farting like hell! I was piss because it takes up to a minute to heat up and be ready to use. (btw, you can use the butane from a lighter to test it. There is less joy)
I explain everything about my story on how I got the idea.
I also meet those awesome yoyo player from Hong Kong! Yeah, I use to play yoyo like a maniac back in the days. Here is a pictures with the gang. It’s because of them that I when to that crazy Halloween party (twice)!
If they look good, it’s because the guy who took the pictures is a good photograph!!
Here is a other robot I made for Solarbotics instructables. The principal is base on the “symet” robot. Symet stand for symetrical/symmetric robot. You have a single motor where the shaft rest on the ground. It moves in different directions depending of the point of contact around the shaft and the ground. In my case I use 3 wheels and one of them is motorized. When the motor is powered, the entire robot spins in circles while moving foward.