Low Battery Disconnect Switch Circuit

Here is the circuit of battery voltage disconnect switch with 10-14V voltage range. The battery disconnect switch uses the versatile 555 timer IC can be found in many electronic circuits. Basically, the circuit aims to prevent damage to the battery due to over-discharge. Schematically illustrated on the monitor battery voltage and disconnect the battery from the circuit when it falls below a preset value.

The battery disconnect switch circuit uses two
Battery Disconnect Switch

Simple Piezoelectric Sensor Alarm Circuit

Here is a simple alarm circuit by using a vibration that comes from a thin piezoelectric sensor, which can be mounted on doors, desks, or media, that can vibrate when knocking the surface. Vibration or signal is then amplified and processed, and sound an alarm within a certain period.

Piezoelectric sensor in general is a device that serves to measure pressure, vibration, acceleration, force, or strain by transforming it into electrical signals. These
Piezoelectric Sensor

Computer Temperature Monitor

Computer Temperature Monitor Circuit
Excess heat too much can cause damage to the electronics. Similarly, on a computer or laptop, so monitor the temperature of CPU and other computer components are very important. Computer temperature monitor can help you keep the equipment running in good condition.

In order for a laptop computer temperature monitoring program to function for most of this type, then you need to activate the ACPI BIOS motherboard. This program serves as a controller of the
Computer Temperature Monitor

Motion Sensor Light Switch Circuit Diagram

Today many available commercial motion sensor light switches on the market, one of the brands that are sought after a Leviton motion sensor light switch type PR180-1LW Leviton decora Incandescent 500W, Passive Infrared Wall Switch Occupancy Sensor. You can buy it at a price of about $ 15. Motion sensors are widely used for home security, office, or the places that require extra security.

Motion sensor light switch is a human motion detector that works in a range of infrared detection. If the PIR sensor devices receive the infrared energy emitted by the human body, it will eventually be switching relay which in turn will turn on the lights. So the function of the use of this switch sensor for security purposes, particularly at nighttime conditions.

In addition to buying a human motion detector, if you want to do it yourself (DIY), a motion sensor switch, is now also widely available PIR sensor modules that are sold in general, so that by adding a high-gain amplifier which is equipped with a relay switch, then this it works as a motion sensor light switch.

Motion Sensor Light Switch

Human Motion Sensor Circuit

Here is a human motion detector circuit uses Passive Infrared (PIR) sensor. PIR motion sensor circuit is a device used to detect changes in the infrared waves emitted by the human body with a wavelength of 8-12 micrometers. Of course, measurement of changes in infrared energy that is within a range of detection PIR sensor. Then later modify or encode it into an energy low frequency with small amplitude signals.

Motion Sensor Circuit PIR Focusing – FRESNEL LENS
Usually a motion sensor to sense infrared energy signal changes within a distance of about 10 inches. Focusing on infrared radiation can increase the distance detection of a sensor where it is highly dependent on the range of distance and angle of coverage. For that purpose, it is used Fresnel Lens.

Motion Sensor Circuit

Infrared Motion Sensor Schematic Diagram

Here is a motion sensor schematic diagram using pyroelectric sensor PIR325 in TO5 package. Infrared sensors are made ​​of crystals that produce the surface electric charge when exposed to heat in the form of infrared radiation. If the amount of radiations striking the crystal changes, the amount of charge also changes and then can be measured with a sensitive FET device built into the sensor.

Sensor element used in the motion sensor schematic diagram is sensitive to radiation through various filters so that the window is added to the TO5 package to limit the detected radiation to the range of 8 to 14mm of the most sensitive to human body radiation.

Motion Sensor Schematic Diagram.

LM35DZ Temperature Sensor Schematic Diagram

Here is a circuit of temperature sensor, only designed to automatically control the temperature with high accuracy. Circuit switching miniature relay ON or OFF according to temperature detected by single-chip temperature sensor LM35DZ. Temperature is controlled by circuitry that 0-100 degrees Celsius.

LM35DZ found when the temperature of a certain level (determined by VR1), the relay is activated crossing. When the temperature drops below a set value, the energy of the relay. The sensor circuit can be activated by AC or 12V DC or battery (100 mA minimum). Here is a simple temperature sensor circuit.

Temperature Sensor Circuit

Motion Sensor Schematic Diagram

Here is a motion sensor schematic of the X-10 controlled by the PIC12C508 from Microchip, the type MS14A EagleEye Motion Sensor. This motion sensor consists of an RF transmitter unit, two LEDs, two push-buttons, and a motion sensor pyroelectric and powered by 2 AAA batteries.

In this motion sensor schematic consists of two detector circuit, which is a light/sun sensor using a standard Cadmium Sulfide cell to detect levels of light, placed as the outdoor sensor. And as a motion detector used Infrared (IR) sensor using a pyroelectric sensor.

Motion Sensor Schematic Diagram