This is an alarm circuit which will go off when any motion or movement is detected. Once it detects this motion, the circuit will trigger an alarm buzzer to sound which will remain on until the power is disconnected from the circuit. This alarm circuit`s most common use is to detect a person moving through an area where the motion detector can sen
Click here to download the full size of the above Circuit.
se. Before this, we built a simpler motion detector circuit that turned on an LED once motion was detected. But 1 or 2 seconds after, the LED would go off. The difference between that circuit and this one which we`re now building is that an alarm must stay on once it is activated until it is manually turned off such as by shutting off all power. If an alarm just went off once and stopped, it wouldn`t be very much of an alarm. Once motion is detected with this circuit, it will turn on the buzzer, which will buzz until the circuit is manually disconnected. This is similar to an alarm only shutting off when a homeowner enters in the password to turn it off. A very good buzzer which can be used is a 1. 5-3V metal buzzer which can be found at allelectronics. com. This is a very low-voltage buzzer which only needs 1. 5V to 3V to operate. However, you can use any buzzer that can operate at 5V of power or less. If you only have buzzers that need more voltage, then you`ll have to power the buzzer with an external power source. Instead of connecting the anode of the buzzer to the 5V terminal of the arduino, you would connect it to an external voltage source, giving it the necessary voltage the buzzer would need. The main electronic component we will use that allows us to pick up this detection is the PIR motion sensor. The PIR motion sensor is a sensor which detects movement through picking up infrared waves. Being that a person...
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: