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Fire alarm can be made with a light sensor (LDR) as in the article with the title of Fire Alarm with this LDR sensor. Principles of fire detection Fire Alarm with LDR sensor is to detect the presence of smoke through the LDR. LDR in the series Fire Alarm does not stand alone in detecting a fire, but the LDR in the pair with the light shining on the LDR. Hence, in the detected smoke from the fire then the intensity of light received by the LDR LDR decreases and eventually trigger an alarm system on a series of Fire Alarm with this LDR sensor. Part 2 that in the series of Fire Alarm with Sensor LDR are some of the sensors, tone generator, audio power. Image Series Fire Alarm with Sensor LDR Function Section of the Fire Alarm with Sensor LDR Part of LDR and light sensor facing to fire smoke detection Part trigger using transistors and regulators as a trigger tone generator 7805 Tone generator section with IC UM66 Power audio section uses an audio power IC TDA 2002 which is equipped with v...

Simple Acoustic Sensor Circuit diagram. This acoustic sensor was originally developed for an industrial application (monitoring a siren), but will also find many domestic applications. Note that the sensor is designed with safety of operation as the top priority: this means that if it fails then in the worst-case scenario it will not itself generate a false indication that a sound is detected. Also, the sensor connections are protected against polarity reversal and short-circuits. The supply voltage of 24 V is suitable for industrial use, and the output of the sensor swings over the supply voltage range. Simple Acoustic Sensor Circuit diagram : Simple Acoustic Sensor Circuit Diagram The circuit consists of an electret micro-phone, an amplifier, attenuator, rectifier and a switching stage. MIC1 is supplied with a current of 1 mA by R9. T1 amplifies the signal, decoupled from the supply by C1, to about 1 Vpp. R7 sets the collector current of T1 to a maximum of 0.5 mA. The operating poin...

This acoustic sensor was originally developed for an industrial application (monitoring a siren), but will also find many domestic applications. Note that the sensor is designed with safety of operation as the top priority: this means that if it fails then in the worst-case scenario it will not itself generate a false indication that a sound is detected. Also, the sensor connections are protected against polarity reversal and short-circuits. The supply voltage of 24 V is suitable for industrial use, and the output of the sensor swings over the supply voltage range. Simple Acoustic Sensor Circuit diagram : Simple Acoustic Sensor Circuit Diagram The circuit consists of an electret micro-phone, an amplifier, attenuator, rectifier and a switching stage. MIC1 is supplied with a current of 1 mA by R9. T1 amplifies the signal, decoupled from the supply by C1, to about 1 Vpp. R7 sets the collector current of T1 to a maximum of 0.5 mA. The operating point is set by feedback resistor R8. The se...

The light sensor circuit shows the application of  photo diode to detect the presence of light. This light sensor can be used as an intermediate circuit in various applications to detect the presence or absence of light. The sensitivity of the sensor can be adjusted using the preset. A photo diode , used as a photo detector, generates current in the circuit when light incidents on it. This circuit uses the photo diode in reverse bias mode with resistor R1(10k). This resistor does not allow too much current to flow through the photo diode in case a large amount of light falls on the detector. Initially when no light falls on the photo diode, it results in high potential at the inverting input of a comparator (pin6) of LM339. When light falls on the photo diode, it allows current to flow through the diode, and thus drops the voltage across it. The non-inverting input (pin7) is connected to a variable resistor VR2 (preset) which is used to set the reference voltage of the compar...

CMPS03 Compass Module Overview Compass is a tool for navigation for a direction, a direction in this article referred to is the magnetic module CMPS03 Compas. Magnetic Compass Module CMPS03 often used in making robots in the contest. Magnetic Compass Module Functions in the contest  CMPS03 usually to provide a reference where the robots are in position and lead anywhere, then the position and direction provided by the Magnetic Compass Module reference sebgai CMPS03 the next robot motion. Magnetic Compass Module uses I2C data communication lines to mirokontroler. With adalanya I2C data communication lines from this CMPS03 this module can be connected directly to a microcontroller that suport with I2C data communication channels such as AVR ATMega. Magnetic Compass Module CMPS03 require 5 V voltage with 15mA current. CMPS03 Circuit Diagram Because the module using I2C Magnetic Compass CMPS03 we can use 5 lines are: VCC + 5 V on pin 1 SCL with Pull Up resistor 10 K SDA with Pull Up re...

Basic circuit of the LM35 are made to control the fan is either used on amplifier that requires automatic cooling. Its use on power amplifier circuit above and only requires DC fan. From basic sensors based on ic and amplifier op-amp is added again to the transistor Q1 to drive the fan. Part List : R1___220K R2___100K R3___3K3 R4___22K R5___1M R6___150R R7___2K2 R8___33R 4W C1___100pF D1___1N4148 IC1__7915 IC2__TL072 IC3__LM35 F1___DC Fan 12V

Reagarding this circuit sent out an alarm when its LDR sensor is exposed to light by sun or lamp. A 555 astable multivibrator was used here which sent signal a tone of about 1kHz upon detecting light. The sensor when exposed by light completes the circuit and makes the 555 oscillate at about 1kHz with transistor to drive current. The sensor is also shown in the circuit diagram. It has to placed making an angle of about 30 – 45 degrees to the ground.  Sensitivity can be adjust with P1.  This makes the sun light to flow through it to the ground and prevents the alarm from going on due to the stored light on the sensor.

LED Photo sensor Circuit Diagram. It is not always necessary to use special photoresistors or phototransistors to make light-sensitive switches. Although it is not well known, normal visible-light and infrared LEDs will also work. A voltage that depends on the intensity of the natural or artificial illumination falling on the LED can be taken from the anode of the LED. This behaviour can be easily verified by connecting a DVM or oscilloscope directly to the two leads of the LED. LED Photo sensor Circuit Diagram: LED Photosensor Circuit Diagram Since the load on the photoelectric potential should be kept as small as possible, a JFET is used here as a buffer. The type used is not critical; similar transistors should work equally well. The buffered voltage is fed to the inverting input of comparator IC1. The threshold voltage can be adjusted to meet the desires of the user by means of the potentiometer. A pull-up resistor is connected to the com-parator output, since the LM393 has an open...

This acoustic sensor was originally developed for an industrial application (monitoring a siren), but will also find many domestic applications. Note that the sensor is designed with safety of operation as the top priority: this means that if it fails then in the worst-case scenario it will not itself generate a false indication that a sound is detected. Also, the sensor connections are protected against polarity reversal and short-circuits. The supply voltage of 24 V is suitable for industrial use, and the output of the sensor swings over the supply voltage range. Circuit diagram : Simple Acoustic Sensor Circuit Diagram The circuit consists of an electret micro-phone, an amplifier, attenuator, rectifier and a switching stage. MIC1 is supplied with a current of 1 mA by R9. T1 amplifies the signal, decoupled from the supply by C1, to about 1 Vpp. R7 sets the collector current of T1 to a maximum of 0.5 mA. The operating point is set by feedback resistor R8. The sensitivity of the ci...

Dorji Applied Technology from China builds different types of RF modules that can be easily incorporated in designing wireless data loggers, sensor network, telemetry and other wireless applications. Some of their RF modules have an additional pre-programmed microcontroller that allows direct interface of selected analog and digital sensors to the module. This means you don’t need any external MCU or to write codes for these sensors. In this tutorial, Raj from Embedded Lab talks about their DRF5150S and DRF4432S RF modules which are very versatile and easy to use for wireless sensor applications. For illustrative purpose, Raj shows how to put them together to construct a simple wireless sensor application where data from a remote sensor are received and displayed on a PC, without using any external microcontrollers. [ ]

This is a project of Simple Color Sensor Circuit Diagram. Color sensor is an interesting project for hobbyists. The circuit can sense eight colours, i.e. blue,green and red (primary colors); magenta, yellow and cyan (secondary colours); and black and white. The circuit is based on the fundamentals of optics and digital electronics. Colour Sensor  Circuit Diagram The object whose colour is required to be detected should be placed in front of the system. The light rays reflected from the object will fall on the three convex lenses which are fixed in front of the three LDRs. The convex lenses are used to converge light rays. This helps to increase the sensitivity of LDRs. Blue, green and red glass plates (filters) are fixed in front of LDR1, LDR2 and LDR3 respectively. When reflected light rays from the object fall on the gadget, the coloured filter glass plates determine which of the LDRs would get triggered. The circuit makes use of only ‘AND’ gates and ‘NOT’ gates. When a primary ...

Circuit diagram is a simple parking sensors, sensing the distance between where the rear bumper of the car and obstacles behind the car. In the circuit diagram there are two parts to the scheme and the scheme for the transmitter receiver. Distance can be understood from a combination of LEDs (D5 to D7) glowing. At 25cm D7 akan beam, 20 cm in e6 & D7 akan shining and 5cm in the D7, D5 and e6 akan glow. When the constraints that exceed 25 cm above none of the LEDs will glow. This circuit is based on the LM324 as a core system. following is a circuit diagram for the image transmitter:   There are pictures on the IC1 NE555 is the cable as astable multivibrator increase IR diode D1 to emit IR pulses. That operates at a frequency transmitter must be set 120Hz.The IR pulses transmitted by D1 will be reflected on the obstacles and received by D2 (infra red). You can also use the photo diode. The received signal amplified by akan IC2a.The peak amplified signal is detected by diode D4 an...

This Line Following Robot sensor or surface scanner for robots is a very simple, stamp-sized, short range (5-10mm) Infrared proximity detector wired around a standard reflective opto-sensor CNY70(IC1). In some disciplines, a line following robot or an electronic toy vehicle go along a pre drawn black line on a white surface. In such devices, a surface scanner, pointed at the surface is used to align the right track. IC1 contains an infrared LED and a photo transistor. The LED emit invisible infrared light on the track and the photo transistor works as a receiver. Usually, black colored surface reflects less light than white surface and more current will flow through the photo transistor when it is above a white surface. When a reflection is detected (IR light falls on the photo transistor) a current flows through R2 to ground which generates a voltage drop at the base of T1 to make it conduct. As a result, transistor T2 start conducting and the visual indicator LED(D1) lights up. Cap...

Color Sensor TCS230 color sensor is a chip that works with the converting acceptance of a certain color of light emitted into the shape of frequency. TCS230 Color Sensor composed dri two main parts, namely a light-receiving section arranged in an array photodioda and Chaya koncerter this part to the frequency. Basically the TCS230 Color Sensor is a light sensor which is equipped with light filters for RGB primary color (Red-Green-Blue) and light sensor without the filter with scale 8 bits for each of this part of the sensor. Photodiode the TCS230 Color Sensor arrays arranged in 8 × 8 with the internal configuration of the photodiode. 16 photodiode for the light sensor with a red light filter. 16 photodiode for the light sensor with a green light filter. 16 photodiode for the light sensor with a blue light filter. And 16 photodiode for light sensor without a color filter. On the use of Color Sensor TCS230 we can choose the color sensor with a filter of what we want to set the configurat...

Dorji Applied Technology from China builds different types of RF modules that can be easily incorporated in designing wireless data loggers, sensor network, telemetry and other wireless applications. Some of their RF modules have an additional pre-programmed microcontroller that allows direct interface of selected analog and digital sensors to the module. This means you don’t need any external MCU or to write codes for these sensors. In this tutorial, Raj from Embedded Lab talks about their DRF5150S and DRF4432S RF modules which are very versatile and easy to use for wireless sensor applications. For illustrative purpose, Raj shows how to put them together to construct a simple wireless sensor application where data from a remote sensor are received and displayed on a PC, without using any external microcontrollers. [ ]