Projects

nachos-avishek-vinay

This is a project for the OS assignment as a part of the coursework of summer semester 2008

losrebellos

Utility classes. Really simple Actionscript classes to make life easier. It's clearly not bugs free. So if you find a bug, drop me a line. (btw, I improve the code little by little, send me some ideas!) There is Actionscript and Javascript dependencies: - Tweener ... [More] (http://code.google.com/p/tweener/) - SWFExplorer (http://code.google.com/p/swfexplorer/) - bulk-loader (http://code.google.com/p/bulk-loader/) - SWFObject (http://code.google.com/p/swfobject/) - SWFMacMouseWheel (http://blog.pixelbreaker.com/flash/swfmacmousewheel) - SWFAddress (http://www.asual.com/swfaddress/) [Less]

rebelchocolat

Crazy CMS!

camera-switchers

CCTV or Audio Video switchers are popular in India for monitoring mutiple locations using CCTV Cameras. As there are multiple cameras and user can watch only one channel at a time, job of the switcher is to select the desired video and audio signal out of installed CCTV and show it on the video ... [More] monitor. User can select any channel using IR remote control. This product can also be put in auto mode where after every few seconds next channel is selected. This way user can just keep watching various channels, each for few seconds. The time for each channel can be set using IR handset. The channels that need to be skipped will have time of zero. The volume level for audio for selected channel can be increased or decreased (or even muted). Models with two way audio will send the voice of user to selected CCTV Camera. An inbuilt speaker in camera will amplify the voice and the persons present there can hear the instructions or what ever is being send by the user at monitoring station. The basic building blocks are as follows 1. Display (four digit numeric display) - This shows the selected channel, (remaining) time for each channel. It also shows the volume for selected channel when setting volume level. Display are seven segment multiplexed and are controlled by Micro Controller digital pins. 2. IR sensor - This received the IR transmission sent by IR Hamdset, converts it to TTL signal and sent to Micro Controller. 3. EEPROM - This saves various parameters like, last channel being viewed, time for each channel, volume for each channel etc.. 4. Signal Output Buffer - Selected channel number is output on seven digital lines of micro controller. These signals are buffered and sent to actual switcher circuit. 5. Audio/Video Switching - This is actual selection of analog signals from various CCTV camera. We use CMOS 4051, which is a popular analog ic with 8 to 1 selector switch. Multiple 4051 are used as per the design. 6. RS485 interface - This is optional interface circuit, where selected channel number is sent on RS485 port to a remote location switcher. Advantage of this is that actual switching (Audio/Video Switching Block) takes place at remote end and it saves lot of wiring issues. This however needs one extra box and a micro controller at remote end. 7. Audio Controller - This adjusts the volume of selected audio signal. 8. Mike and Audio Amplified (optional) - This is used only in two way audio systems. Here a mike picks up the voice of user at monitoring station and amplify and send it to the selected CCTV Camera. Another amplifer in the camera will amplify the audio signal and persons present in and around the selected CCTV will hear the voice/instructions. In normal case the mike at monitoring station is disconnected. It is only when user need to speak to the persons around selected CCTV Camera by pressing TALK switch on remote handset, then the mike gets activated. [Less]

traffic-signal-timer

On a traffic intersection when you wait for signal to change from red to green, or when you are driving and crossing the green signal and you need to know how many seconds are left for green to turn to red, Traffic-Signal-Timer display the remaining time of current signal state. This design is in ... [More] two categories - Single Color and Dual Color. Single color traffic-signal-timer are existing, selling and field proven designs and are based on Motorola/freescale micro controllers. Dual color traffic-signal-timers are new design and are yet to be tried in field. The details here are for dual color model. This design is basically a 3 digit display in two colors - RED and GREEN. This is installed at a traffic intersection and display the remaining time for red/green light. The complete designs consists of following 1. Micro Controller - ATMEL ATMEGA8 is a 20 pin ic with 8k program memory. 2. Sense RED/GREEN signal lights - Two opto couplers senses when red or green signal lights are on/off. Output of Opto is connected to Micro controllers. 3. Display driver - 2 ICS, TD62783 and TLC5916 drive the grids and segments of 3 digit dual color display board. 4. Power supply - converts 12V DC to 5V regulated DC for all digital ICs. 5.RS485 interface - This is an optional interface. This unit can be connected to micro controller and display data is sent by master controller. 6. Two jumpers/switches - These are used to set the unit number of the device. This becomes useful mainly when sending data from master controller. Multiple units are connected on same RS485 bus. Data is displayed when unit number of physical unit matches with that of the data sent by master controller The information included are 1. Source code 2. Circuit Diagram 3. PCB Gerber files [Less]