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
Click here to download the full size of the above Circuit.
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...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
characters left: