This random timer circuit is based on a Atmel ATTINY24 avr driving one power relay. You can use this circuit to switch on and off other circuits randomly. For example, when using this circuit on a model railroad you can turn on and off parts of the animated or moving scenery to create a more dynamic view. This circuit was designed to be used on a
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modular model railroad. This model railroad contains different flashing light on ambulances, police cars and fire engines. These lights are on all the time, with this circuit I hope to keep visitors of a model railroad exposition more interested while watching all the action. The schematic of the random timer circuit is divided into different functionality blocks. The power supply block stabilizes the 12V and protects the power input for reverse polarity. There is a standard 7805 voltage stabilizer to supply 5V to the microcontroller. The input block consists of 3 potentiometers and one button. The potentiometers can be used to configure the on and off time, and the amount of random time. ADC0 is connected the the potentiometer which configures the amount of random time between 0% and 500% extra time. ADC1 configures the off time between 1 and 60 seconds. ADC2 configures the on time in the random timer circuit. The button is there just because I like buttons, it has no functionality. Actually, the prototype of theG‚random timer circuit I made was using one of my other boards ( the tiny dcc decoder for 8 leds ), this board already has the button, so there you go. The processor block is where all the math takes place. The ATTINY24 reads the inputs and calculates the on and off times in the random timer circuit. The ATTINY24 contains a program with predefined random number generated with my online random number generator....
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....
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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....
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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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