This small project is a slave flash, which can trigger up to 4 camera flashes (non-TTL mode). It is meant for use with the Nikon CLS system, although it can probably work with other brands as well, as long as the protocol heuristics are similar. The heuristics of the Nikon CLS system are simple: there are a number of short pre-flashes, then a dela
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y, then the main flash. The algorithm I am using basically waits until it sees a flash, reads in any number of flashes which occur with less than the designated time between them, and when another flash happens which is between the specified min and max times, it fires the slave flashes. The Digital Photography Tips and Technique blog wrote an article on Nikon CLS Advanced Wireless Lighting, as well as an implementation of a slave flash using the Arduino. I used these resources heavily for understanding the protocol, although I chose to use a plain AVR instead of an Arduino for this project. The schematics are simple. I use an AVR (I am currently using an ATmega168, but in theory this should be portable to most modern AVRs with sufficient memory), with a status LED, photo diode (used in photo voltaic mode), and a few triacs for the actual trigger: The code is very simple. I use define statements for all threshold constants and port / pin definitions. I use my own libraries for the analog readings and the time counting; I plan to release these eventually, but they are not yet on my website; please feel free to email me with questions or if you would like me to send them to you. I put the entire thing into a small enclosure, on a breadboard (I love breadboards within enclosures - it gives the professional look of a real enclosure, with the ability to change things that is inherent with breadboards!) There is a power plug and...
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.....
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