Here's a clever circuit using two 555's to produce a set of traffic lights for a model layout. The animation shows the lighting sequence and this follows the Australian-standard. The red LED has an equal on-off period and when it is off, the first 555 delivers power to the second 555. This illuminates the Green LED and then the second 555 changes state to turn off the Green LED and turn on the Orange LED for a short period of time before the first 555 changes state to turn off the second 555 and turn on the red LED. A supply voltage of 9v to 12v is needed because the second 555 receives a supply of about 2v less than rail. This circuit also shows how to connect LEDs high and low to a 555 and also turn off the 555 by controlling the supply to pin 8. Connecting the LEDs high and low to pin 3 will not work and since pin 7 is in phase with pin 3, it can be used to advantage in this design.

How to make a circuit of Automatic Street Light control system?

Working of Automatic Street Light circuit The bulb should remain OFF during daytime and turn ON automatically during night. The unique property of light depended resistor is utilized here. LDR is a variable resistor which has very low resistance in the presence of light and very high resistance in the absence of light. In this circuit, we create a potential divider network with an ordinary resistor in one arm and a LDR on the other arm. According to Ohm’s law (V=IR), voltage drop across the resistor increases when its resistance increases. Here the drop across LDR varies with changes in light intensity. That is voltage drop across the LDR is minimum in the presence of light and maximum in the absence of light. One end of the LDR is connected to the base of a BC 187 transistor. At night, the drop is very high (> 0.6V) and it is sufficient to turn on the transistor. When the first transistor is ON next one will also turn ON. Thus the relay coil energizes and the bulb will glow. Read further: How to connect relay: Relays working with animation During day time the drop is very small (< 0.6V), so the transistor remains in OFF state. The diode Df is the free wheeling diode used for decaying the energy stored in the relay coil when the circuit is switched off. Components Pin out BC187 Relay LDR

How to Connect a CCTV Camera Directly to a TV

 

Sometimes customers do not want to record surveillance video and just want to display the live video from a CCTV camera on a TV or monitor. This article will explain how to connect a CCTV camera directly to a TV / monitor and what equipment is needed to do it. How to view multiple security cameras on a TV will also be explained here.
Because CCTV cameras transmit an analog / composite video signal, the video is directly compatible with TVs that have a composite RCA video input.

Note: although we used a BIPRO-540L4 bullet IR camera in this article, any analog CCTV camera that has a BNC video video out can be used in it's place. Also, we used pre-made Siamese cable in our example because they are so easy to use, but installers can also use a spool of RG59 coax cable if they prefer to cut the cable to the exact length that they need.
Why would someone want to use a security camera only to view live video and not record any surveillance footage to a DVR?
Here are some uses that customers have told us about.

• Check who is at the door at a home or business location
• Provide customers with a live view of some point of interest within the business
• By displaying live video on a TV, there is a theft deterrent by showing that the location has security cameras in place

Connecting a CCTV Camera Directly to a Monitor

Below is a diagram shows how an analog CCTV camera can be directly connected to a TV / monitor. 

How It Works

1. The CCTV camera video out and power in connected to a pre-made Siamese coax cable. Siamese cable is used in CCTV applications to run both video and power to / from cameras.
2. Because both video ends of the cable has male BNC connectors, the TV side must be converted to an RCA male connector so that it can plug into the female RCA input on the TV.
3. The 3.1mm power plug connects right to the DC power supply that is included with the camera and the power supply plugs into a standard 110 power outlet.
4. When the user wants to view the live video from the security camera, they just select the video input of the RCA in that they used and video is displayed.
5. Optional and explained below - If the user wants to also hear audio on the TV, they can connect a stand alone audio surveillance microphone to one of the RCA inputs of the TV.

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How to View Multiple Security Cameras on a TV

If you want to view multiple cameras on a TV at the same time, you can use a CCTV quad processor (up to 4 cameras) or a CCTV multiplexer (up to 16 cameras) to combine the video signals.

ow it Works

1. The analog security cameras (CCTV) are hard wired to the video inputs of the quad multiplexer using RG59 coax cable. You can premade RG59 jumper cables like these.
2. The multiplexer (mux) has a single BNC video output. You can use another RG59 jumper to run the video from the mux to the TV.
3. On the TV end of the cable, the BNC connector can be converted to a male RCA with this connector.
4. The video multiplexer processor can be configured to display all 4 cameras on the screen. It can also be configured in other ways such as single picture scrolling with delay, picture in picture, dual picture, and more. You watch the below video to see some of the different screen configurations that are supported by a 16 channel video multiplexer.

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Video Multiplexer Demo

Watch the above video to see how multiple security cameras can be combined and viewed on a single TV.

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Connect Surveillance Mic to TV Audio

For users who want to hear audio surveillance in addition to live security camera video on their TV, the below diagram shows how a surveillance microphone can be connected to your TV.

 

Description

IP Network Surveillance Camera

Schematic Block Diagram for IP Network Cameras

The world of video surveillance is moving toward the IP network. An IP Network Camera can be defined as a camera with networking and video processing combined into one unit. A network camera has its own IP address and the computing functions necessary to handle network communication. It captures and transmits live images over the network, enabling remote viewing and user control from anywhere, anytime.
TI's DSPs are used to compress the image in a variety of standard and nonstandard video formats. Additionally, TI DSPs offer the ability to use intelligent image analysis functions and various types of networking protocol support.
Digital video transmission is fast becoming the standard requirement for security and surveillance systems. Both wired and wireless links are of interest for security and surveillance architects.
Texas Instruments has a long history of providing expertise and superior products to the video market. TI's comprehensive solutions cover the entire video chain - everything from the initial capture of video content to the final viewing experience.

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