Father AI Sensor Array - LVL1 Description: This is the sensor array for the Father AI project. This makes Father AI aware of its environment. More Details: Photo Gallery: This post was submitted by admin. Helmholtz resonance A brass, spherical Helmholtz resonator based on his original design, circa 1890-1900. Qualitative explanation[edit] When air is forced into a cavity, the pressure inside increases. When the external force pushing the air into the cavity is removed, the higher-pressure air inside will flow out. The air in the port (the neck of the chamber) has mass. Quantitative explanation[edit] It can be shown[2] that the resonant angular frequency is given by: (rad/s), where: (gamma) is the adiabatic index or ratio of specific heats. For cylindrical or rectangular necks, we have is the equivalent length of the neck with end correction, which can be calculated as :, where is the actual length of the neck and is the hydraulic diameter of the neck[3]; is the volume of air in the neck, thus: From the definition of mass density ( , thus: and fH is the resonant frequency (Hz). The speed of sound in a gas is given by: thus, the frequency of the resonance is: Applications[edit] Notes[edit] Sources[edit]
DIY Bend Sensor (Using only Conductive Bags and Masking Tape) So, after lurking around in the shadows for years I've finally gotten round to making my first step-by-step instructable. *yay* A little background as to how this whole idea came about. Back in 2009, I needed some bend sensors for a sign language translation glove I was making for fun, and the commercial ones that just came out were over my budget considering I needed at least 10. Then I came across plusea's DIY bend sensors on Instructables. It was what I was looking for but I had one small problem. So I decided to see if I could just experiment with the conductive anti static bag(although in all honesty I tried matching it with a whole bunch of other stuff; like carbon paper). So for all of you who has a tight budget or like me, can't get easy access to items in the states, this is for you.