This project is almost useless, I want just to realize a pendulum that swings endless. Nothing more. No use at all. This is not an original project but my version of a project of the past century, already seen in many different ways on the Net. This is my first time with a so small PIC. It`s very interesting. It can be used for a lot of different
Click here to download the full size of the above Circuit.
situations, substituting transistors, logic ports, NE555 and so on with a lot more flexibility. To the left, the signal at TP1 (see schematic diagram ), at the coil. Choosing the right magnet and coil, the voltage is enough to trigger a digital port of a PIC (a peak of 3V in this picture), no ADC is used. In this way the PIC can go sleeping for a long time between pulses, it works just for 10ms for each semi-cycle. The "Wake on input change" feature restarts the program every time the magnet passes over the coil. At TP3 we have the pulse that triggers the transistor for a new kick to the pendulum. I have used a PNP transistor to have a high side driving for the coil, so the pulse must be negative. The PIC10F222 works fine in the 2 to 5. 5V power supply range. The high level threshold for a digital input is related to the power supply. With 3V power supply we can see that the trigger starts when the voltage at GP1 rise above 1V. With a 5V power supply it needs an higher lever and therefore more time to start. There is a direct relationship between the amplitude of the input signal and the amplitude of the swing. Because the period of the pendulum is constant, for a larger swing (more distance to travel) it needs to run faster (V = S/t). The induced electromotive force (EMF) in any closed circuit is equal to the time rate of change of the magnetic flux through the circuit (Faraday`s Law of Induction). So, you can know if 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: