Here is the gas leakage circuit uses the SEN-1327 gas sensor module. Its output goes high when the gas level reaches or exceeds certain point. Interfacing with the sensor module is done through a 4-pin SIP header.
Pin details of the gas sensor module are shown in bellow picture An MQ-6 gas sensor is used in the gas sensor module. The sensor can also be used to detect combustible gases, especially methane.
Whenever there is LPG concentration of 1000 ppm (parts per million) in the area, the OUT pin
Simple Gas Leak Detector Circuit
Posted by admin on April 30th, 2012
Here is the gas leakage circuit uses the SEN-1327 gas sensor module. Its output goes high when the gas level reaches or exceeds certain point. Interfacing with the sensor module is done through a 4-pin SIP header.
Pin details of the gas sensor module are shown in bellow picture An MQ-6 gas sensor is used in the gas sensor module. The sensor can also be used to detect combustible gases, especially methane.
Whenever there is LPG concentration of 1000 ppm (parts per million) in the area, the OUT pin
FTDI Infrared
Posted by admin on April 28th, 2012
Here is hobby project of building a home-brew IR receiver/transmitter based on the FTDI chipset.
This Project using several IR receivers and transmitters that where based on RS232 connections.
Receiving is the opposite from transmission, and in this case it's 'sampling' the pin at a high enough datarate. The chip will simply sample all pins and put it in it's fifo buffers. We can read the fifos and inspect the samples.
To make reception reliable I've choosen to use a chip which already is tuned
3 Axis Accelerometer Using PIC16F887
Posted by admin on April 25th, 2012
my friend reported that his 3 axis accelerometer project is working on. He is using Microcontroller PIC16F887 for this circuit.
The direction-sensing is accomplished by Freescale’s MMA7361L, which is a three axis low-g micromachined accelerometer in a tiny (14 pin LGA) package.
The advantage of this chip is that it’s super simple to use:
just connect the three directional output pins to an analog-digital converter input of a microcontroller and you’re ready to go. With a few
Simple 3V adjustable Car adapter
Posted by admin on April 14th, 2012
Here is very simple power car adapter , this schematic can use for all. for first you must measure the output voltage using multimeter. This schematic can build less than 5 minutes.
The Part of schematic is:
R1 = 240 ohm
VR = 1 Kohm
Vin = ~12V (from battery car)
Serial RS232 Booster Up to 100m
Posted by admin on February 9th, 2012
This circuit can run over relatively long distances (up to 100 metres), inexpensively, reliably, and suitable for speeds up to 2400 bauds. At the distances considered, the main expense is normally the cable, so here a readily available 60 ohm coaxial cable is used. Because of its relative immunity to noise, current drive is employed. In the line driver - figure 1 - transistor TI, diode D4, and resistors R3 and R4 form a current source that can be fed direct from a non-regulated supply of 8. . .I0
Programmable Home Security System using LDR
Posted by admin on January 13th, 2012
In this project we design low cost high performance programmable home security system using few LDR's as an input sensors. When above sensor(s) get triggered system may dial the user specified phone number (using build-in DTMF generator) and activate the high power audio alarm and lights. All the parameters of DTMF generator, audio alarm and light interface are programmed through the RS232 serial interface.
Current firmware of this system presents interactive control system through the RS232 interface.
Handy Talky 27 Mhz
Posted by admin on January 11th, 2012
Handy Talky circuit has the advantage of this kind can double loudspeaker. On receipt, serves as a loudspeaker, and at the radiating function as a microphone.
Transmitter section
Handy Talky transmitter section uses a single transistor level. The circuit was built by Tr. Output frequency is determined crystal X, (in this case the frequency 27,125MHz). Transmitter circuit is part of Handy Talky transmitter oscillator. Transmission power about 100 mW. Of power is not strengthened, but is fed directly
New LED efficacy 1A operation
Posted by admin on November 26th, 2011
Japanese LED pioneer Nichia has claimed it has achieved a record luminous-efficacy figure in a device running at 1A drive current. A figure of 135 lm/W was reported for four 1x1-mm die connected in series.
Yukio Narukawa and colleagues note that at 1913 lm their device had a higher flux than a 20W-class fluorescent lamp and 1.5 times the luminous efficacy of a tri-phosphor fluorescent lamp.
Nichia also improved its LED's optical performance, focusing on making sure as little light as possible remains
Sound Sensor Schematics
Posted by admin on November 5th, 2011
Here is simple sound sensor schematic, it's use only one IC and and two transistor to drive the relay. this schematics can change the sensitivity using VR resistor also. I think this schematics is very usefull and can build anyone.
Digital LS7220 keyless-lock Schematic
Posted by admin on September 24th, 2011
Each of the 12 keys are brought out to separate wires, and each wire is connected to a different pin of a 24-pin socket (SO1).
The four-digit access code must be entered in the proper sequence. When the correct access code is entered (in the proper sequence), positive voltages appear at pins 3, 4, 5, and 6 of Ul. With Ql conducting, its collector is pulled to ground potential, energizing relay Kl. Capacitor C2 controls the total time that the output of Ul at pin 13 is positive after the release