This circuit is based around the PIC 16C84 (or PIC 16F84) microcontroller. This chip is actually a small computer contained in a single chip, including RAM memory, EEPROM, I/O ports, CPU and so on. When you buy this chip, it comes empty with no program on it. You have to compile the source code and download the resulting machine code into it, usin
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g a PC and a small programmer attached to the parallel port of the PC and the chip. To get yourself familiar with this stuff, I suggest you first read this link: Getting started with microcontrollers. This circuit is a parking aid. Two infrared sensors (or at least one) are continuously sensing the distance between the back of your car and an obstacle (i. e. the other car). Feedback to the driver is given via sound through a speaker. There are six levels: the first level (starting level) sounds short low frequency beeps and long pauses to indicate that there is an obstacle further than about 1m40. The second level sounds long low frequency beeps when you are between 1m and 1m40 of the obstacle. The third, fourth and fifth level will get you higher in frequency (and shorter beeps) when you are nearing the other vehicle at resp. less than 1m, 75 cm and 50 cm. When you are closer than 25 cm, you are in level 6 where quick dual-tone sounds can be heared, indicating that you are about to crash. When there is no obstacle, no sound is heard except some soft ticking, indicating that the processor is running OK. When the device is put on (preferably through a switch or operated together with the back driving lights) a short dual tone is heard to confirm that the device is up and running. The circuit makes use of the Sharp IR distance sensor GP2D02. This sensor is based on triangular measuring principles, and is designed to measures...
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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