Zipper Sensor

Posted on Feb 5, 2014

I used 45 peices of 220 ohm resisters to make 10k ohm variable resister. By banding the wire of the resister I made hook to sew it through. If you want even less volume than normal resister, you can use tiny surface mount resister. To tie with the thread, solder conductive beads at the both end of the resister. I made two different types of input with

Zipper Sensor
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zipper sensor - analog and digital. My initial thought was to make liner analog potentiometer by using the slider as connecter. Yet during producing, I begin to think any handmade physical device might be not reliable to use as sensor. Conductive thread might create some iragualer resistence. Stiching unit is not always exactlly same so that the value change would not follow exactlly as the movment of the slider. Thus I planed to make an analog and a digital zipper sensor with in same length so that both can be compared with the motion reading. For the analog I used plastic zipper to secure disconnection between both sides. And for the digital I used nickel zipper because some of the teeth will function as contact point of switches. My first step was to choose an analog in sensor as resference to new zipper sensor. I chose the most common turning nob type 10k ohm potentiometer for the reference. Since it is 10k ohme variable resister, I design to have 46 pieces of 220 ohm resister in line to have detailed value in proper length of zipper. It ended to be about 24 inch. When the zipper is applied to jackets or shirts, pull down resister is needed next to the signal thread. Because when both sides of the zipper are totally separated, the signal thread will loose the connection to the ground and give random value. The slider itself has the perfect structure to connect two stich lines sewed in the opposite sides. Though the...

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