Force See-Saw

In order to apply the learnings from the Prototyping & Scripting course by Clifford Choy, we were to realize a mini-project utilizing an Arduino ESP8266 wifi-module, sensors and actuators, a PureData TCP server and an Android App built using MIT AppInventor2.

My group came up with the concept of a see-saw moved by a servo and controlled by an ultrasonic sensor.

Watch the video on Vimeo.

The HC-SR04 sensor measures the time between sending and receiving the ultrasonic waves, which we can convert to the distance as we know the speed of sound. This distance is then mapped to the degree of rotation of the servo and the NeoPixel led-stripe on the see-saw.

The very same value is also sent to the PureData server, which uses it for generating sound via modulating two sine waves, which are in sync when the see-saw is in balance and drift apart the further the see-saw is out of balance. The degree value is also forwarded to a website containing some JavaScript, which can be read by our Android App.

Using MIT AppInventor2 we then use the value to give some visual feedback (a digital depiction of the physical see-saw) and start a countdown when the see-saw is in balance, resulting in additional visual and acoustic feedback.

Project members:
Ritesh Sharma
Dustin Stupp
Tim Tang
Tania Jocelynn Trisnadi

Prof. Dr. Clifford Choy

Special Thanks to:
Victor Cheung (/Zhang)

Force See-Saw
Force See-Saw
Force See-Saw