This page is browser friendly, by the way. Make your browser`s window less wide than your whole screen and you will find the narrower columns much easier to read. The page is in two parts. At the top, there`s a very basic program, showing you the RFID reader at work. At the bottom, that program is slightly modified, to create something to open a d
Click here to download the full size of the above Circuit.
oor when either of two specific RFID devices are brought near the reader. Before we get down to work, how`s this for a neat way to carry an RFID tag with you everyday The central photo shows the tag. It is a small glass capsule. Sparkfun sell them in this form for about $5. My watch strap just happens to have a little cavity, just the perfect size, on its underside. I`m still looking for the "perfect" glue to hold it in place. Hot-melt glue wasn`t the answer. In this page I will show you the basics of connecting an Innovations ID-20 RFID reader, available from Sparkfun. com, to an Arduino. ($35, (+p&p, 12/11)While the essay was written while working with an ID-20, I don`t believe that users of the ID-12 would do anything different. (The ID-12 is less expensive, $30, (+p&p, 12/11) but doesn`t read over such a long range. In hindsight, I don`t thing the extra range of the ID-20 makes any difference to me, in my application. I have the ID-20 behind a pane of glass, and "wipe" my RFID tag across the glass. I don`t think the ID-12 would have trouble. I have to bring my tag within about 8cm of the reader anyway, so being closer isn`t a problem. See below for an even less expensive option. ) If you take my advice, if you buy the Sparkfun product, you will also buy the breakout board Sparkfun offers for the ID-20 (or ID-12). Part SEN-08423, 95 cents. And the 2mm socket strip (2x PRT-08272, $1 ea). The pin numbers used below are 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: