Sajee tronics

How the Pet Microchip Works The basic technology behind pet microchips traces back several decades. But, it wasn't until recently that the devices became cheap enough to hit the mainstream pet market. A pet microchip uses  radio frequency identification (RFID) technology. RFID, as the name implies, uses  radio  waves as a medium to transmit information. An RFID tag stores data and, using  electromagnetic  forces for power, communicates that data to a device that interprets it. If you're curious about this process, read  How RFID Works . RFID tags come in different forms. Microchips in animals don't need to actively transmit information; they just hold information (a unique identification number for the pet). This type of tag, dubbed a  passive RFID tag , has no  battery  and no internal power source. Rather it sits completely inert in the animal, waiting to be read. A microchip capsule is roughly the size of a grain of rice and inc...

Hi,I recently designed a sort of "library" in order to make easier to play exact notes on arduino with the buzzer. I included the frequencies of the notes (pleasant to be heard) with #defines . I then defined the value of the BPM ( you can modify it obviously) and according to that I defined the note values ( the most commonly used ones). With this defines you can easyly play a note with the command "tone" like this: tone(pin, note, duration) Code : /* Play Melody  * -----------  *  * Program to play melodies stored in an array, it requires to know  * about timing issues and about how to play tones.  *  * The calculation of the tones is made following the mathematical  * operation:  *  *       timeHigh = 1/(2 * toneFrequency) = period / 2  *  * where the different tones are described as in the table:  *  * note         frequency     ...

Arduino Remote Trigger for DSLR How to make this kind of shots ? Boys "Ale Ale song" Anniyan -Fight scene. Multiple DSLR's controlled by a timely trigger system. - "Time Slice" Camera Set up for the fight scene We will see a small example to trigger one camera . But to take this kind of shots u can use this same module by having different relays for each camera. I have a Canon DSLR camera which uses a 2.5mm stereo phono jack connector to allow for a tethered remote.  These are surprisingly expensive.   http://www.doc-diy.net  provides an illustration of the way the connector works.  It is pretty simple to put some electronics behind your camera for stop motion or candid photography.   It controls the camera to automatically take a photograph within a period of 0-60 seconds or 0-60 minutes, set by a sliding potentiometer.  I can enab...