This article describes how to build a simple uC based delay circuit for photographic applications like drop or high speed photography. It can be used to control the trigger lag of cameras and flash units, generate a periodic trigger pulse or even control magnetic valves. The input and the three outputs of the circuit use standard 3. 5 mm stereo jac
Click here to download the full size of the above Circuit.
k connectors, so the delay element can be looped easily into your existing trigger circuitry like the SmaTrig for example. Cascading multiple delay devices into more complex circuits is easily done. As simplicity was an important design goal, there is no text display or a sophisticated analog input stage. All resources to build a copy of the delay are provided below in the Download section. A short press of the on/off button switches the circuit on and off. By holding the on/off button down while switching on you can cycle through the three time ranges indicated by the LEDs. The chosen operating range is saved in the EEPROM so the uC will remember the last setting after switching off or even removing the battery. Directly after programming the AVR your delay will work as described in this section. The delay time is set by two potentiometers. The left one is used for the coarse time setting (0-100% of the chosen range), the right one allows fine tuning (0-10% of the chosen range) of the delay time. Both knobs turned to the maximum will result in 110% delay time (1. 1 s, . ). The functions of the wheels are: The coarse/fine solution proved to be very convenient in practical use (dark room). For drop photography, the absence of a display turned out to be unproblematic, because you keep your eyes on the drop and not the delay while adjusting the time. The manual trigger button allows to simulate a trigger event and is useful...
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: