Here are many ways to you will provide the protection you deserve. 4 Alarm Control Systems has been providing Fire and Security The Simple 4 Digit Alarm Control keypad Circuit Diagram must be the kind with a common terminal and a separate connection for each key. On a 12-key pad, look for 13terminals. The matrix type with 7 terminals will NOT do. The Alarm is set by pressing a single key. Choose the key you want to use and wire it to `E`. Choose the four keys you want to use to switch the alarm off, and connect them to `A B C & D`. Your code can include the non-numeric symbols. With a 12-keypad, over 10 000 different codes are available. Wire the comm onto R1 and all the remaining keys to `F`. When `E` is pressed,current through D2 and R9 switches Q5 on. 4 digit Alarm Control keypad Circuit Diagram The relay energies, and then holds itself on by providing base current for Q5 throughR10. The 12-volt output is switched from the “off ” to the “set ”terminal, and the LED lights...
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Supervisory Control And Data Acquisition What is SCADA? It is supervisory control and data acquisition in which automation is done from remote locations. It is partial controller it is always used with PLC, which is main controller. PLC is located on the site but with the help of SCADA we can monitor and give command to the PLC. Why do we use SCADA in automation? In PLC we cant see the actual process ongoing in the industry for that SCADA is used in which we get animated view of that process. Using SCADA we can supervise as well as control the process. Advantages of SCADA: 1. Increase in productivity. 2. Improves quality. 3. Increase in safety. 4. Flexibility. 5. Increasing efficiency. 6. It is versatile. Elements of SCADA: 1) Object 2) Properties 3) Tags Object: - In SCADA we need some shapes to represent the actual machines e.g.tanks, pipes, ...
This low-power UHF FM transmitter is intended for remote control applications such as garage doors and wireless alarm systems . It is a single transistor design that operates at a frequency reserved for low-power wireless signalling. The operating frequency is determined by a resonator, F11. The following types may be used: UK: Type R2528 for 418 MHz; USA: Type Rl53O for 315 MHz; Holland, Belgium, Germany: Type R2554 for 433;92 MHZ: France: Type R2523 for 224.5 MHZ. The transmitter is frequency-modulated by an audio (or digital) signal applied to the junction of a varactors D1, D2 via R3. The varactors effectively change the shunt capacitance of the resonator as a function of the modulation signal, which results in FM. The design may be changed to produce AM (amplitude-modulation) by omitting components D1, D2, R2, R3 and R6, and interconnecting points ‘A’ and ‘B‘. Transistor T1 is fitted at the solder side of the printed circuit board, as indicated by the dashed outline on the compo...
Here is a circuit that lets you operate your home appliances like lights and water pump from your office or any other remote place. So if you forgot to switch off the lights or other appliances while going out, it helps you to turn off the appliance with your cellphone. Your cellphone works as the remote control for your home appliances. You can control the desired appliance by pressing the corresponding key. The system also gives you voice acknowledgement of the appliance status. Circuit description Fig.1 shows the circuit for cellphone based device control with voice acknowledgement. It comprises microcontroller AT89C51, DTMF decoder MT8870, voice recording/playback device APR9600 and a few discrete components. Fig.1: Circuit for cellphone-based device control with voice acknowledgement Microcontroller AT89C51 is at the heart of the circuit. It is a low-power, high-performance, 8-bit microcontroller with 4 kB of flash programmable and erasable read-only memory (PEROM) used as on-chip...
Louder music, sirens or speech in response to higher ambient noise levels? This simple circuit has the answer, and it may enable your robot to be at least as noisy or loud-mouthed as the others in an arena. The circuit consists basically of a microphone, a level detector, a 4-state counter and four analogue switches connected to a resistive ladder network. Looking at the circuit diagram, the signal from electret microphone M1 is amplified by T1 whose collector voltage appears across a potentiometer. M1 gets its bias voltage through R4. Depending on the setting of P1, the 4040 counter will get a clock pulse when a certain noise level (threshold) is exceeded. The counter state determines the configuration of the four electronic switches inside the 4066 and so the series resistance effectively seen in the audio signal line. The circuit should be powered from a 9-V regulated supply or a battery and will consume a few milliamps only. Switch S1 allows the counter to be reset, switching all 4...
For a hobbyist, it has always been fun to activate or automate through a clap or a whistle . A whistle sometimes can act like a voice recognition actuator as the frequency varies from person to person. However, for this use the tuning is to be done around 1700 Hz, a pitch that is somewhere near to the middle C octave of the piano chords. A condenser microphone acts as the audio sensor and produces a few milli - volts of current to activate the electrical actuator like a relay. For this it has to be supported by a transistor or FET. Driving such a switch with the resultant milli-Volt from the condenser microphone is not possible. Hence an overall gain 4000 times larger is needed to be divided into two amplifier sections having gain values of 65 each. Resistors denoted by the values R1, R2 and R3 are responsible for the individual gain of the amplifiers and are 1.1K, 1.2K and 15K respectively. Thus we arrive at the formula given below · R1 = Q/(G*C*2*Pi*F) = 8/(65*.01^-6*6.28*17...
This is a simple Turns ON-OFF Control Circuit Diagram , This simple circuit can be use circuit instead of a standard on-off switch. Switching is very gentle. Connect unused input pins to an appropriate logic level. Unused output pins *MUST* be left open!. First 'push' switches ON, another 'push' switches OFF. You can use 1/4 watt resistors if they are metal-film type. Any proper substitute will work for Q1, including the European Tun's. For C2, if you find the relay acts not fast enough, leave it out or change to a ceramic cap between 10 and 100nF. Turns ON-OFF Control Circuit Diagram Parts List All resistors are 1/2 Watt and 5% tolerance. R1 = 10K R2 = 100K R3 = 10K C1 = 0.1μF, Ceramic C2 = 1μF/16V, Electrolytic D1= 1N4001 Q1 = 2N4401 (ECG123AP, NTE123AP, etc.) IC1 = 4069, CMOS, Hex Inverter (14069), or equivalent S1 = Momentary on-switch
This circuit confuses the infra-red receiver in a TV. It produces a constant signal that interferes with the signal from a remote control and prevents the TV detecting a channel-change or any other command. This allows you to watch your own program without anyone changing the channel !! The circuit is adjusted to produce a 38kHz signal. The IR diode is called an Infra-red transmitting Diode or IR emitter diode to distinguish it from a receiving diode, called an IR receiver or IR receiving diode. (A Photo diode is a receiving diode). TV Remote Control Jammer Circuit Diagram There are so many IR emitters that we cannot put a generic number on the circuit to represent the type of diode. Some types include: CY85G, LD271, CQY37N (45¢), INF3850, INF3880, INF3940 (30¢). The current through the IR LED is limited to 100mA by the inclusion of the two 1N4148 diodes, as these form a constant-current arrangement when combined with the transistor and 5R6 resistor.
Hi Friends Here i want to share a new post related to PLC and Visual Basic VB6.0 Communication VB code is given below. Enjoy “Real Time Automated Control using PLC-VB Communication” Abstract This paper is to enable the Delta PLC (Programmable Logic Control) DVP14SS to communicate with the Visual Basic 6.0 . The communication between DVP14SS and Visual Basic 6.0 is via Modbus Serial Protocol. Computers are used as a link between humans and PLC systems as they have more graphics and visual capabilities. These are nothing but SCADA systems widely used for determining plant set-ups and displaying plant status on high quality screens. They also record/log the system data for long period .The SCADA software’s are the software packages needs to be purchased from vendors and the cost depends on tag count. Visual Basic 6.0 platform can be used develop the SCADA application effectively. Using VB 6.0 we integrate software and hardware across spectrum of vendors easily. Here we show simp...