Control Introducing of PLC (Programmable Logic Controller)

At former epoch, before PLC is found, control systems at industry applies conventional network, which in the form of network relay. By using this network, we require many places and many components, besides need many cables also to string up it is and many releasing cost that is big enough to make a conventional control system.PLC in finding around year of 1968 and company that is firstly makes is Schneider electric by the name...

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Control 2-Way Multiplexed LCD and Low Cost ADC Using COP8 Microcontroller

This circuit is intended to show a general solution for implementation a low cost ADC and a 2-way multiplexed LCD using COP840C 8-bit microcontroller. The implementation is demonstrated by means of a digital personal scale. Details and function of the weight sensor itself are not covered in this article. Also the algorithms used to calculate...

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Control PIC for Multiplexer

Recently, I had to design a circuit real quick that transmitted 4 parallel TTL data bits over 350m of twisted pair cable. I needed to feed in four parallel data bits at one end, and get 4 parallel data bits out the other end, completely transparent to the transmitting and receiving circuits. I decided to implement this using a PIC 16F84 for...

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Control Power Supply derives 5 and 3.3V from USB port Circuit for Microcontroller

The circuit in the figure derives its power from a USB port and produces 5 and 3.3V supply rails for portable devices, such as digital cameras, MP3 players, and PDAs. The circuit allows the port to maintain communications while, for example, charging a lithium-ion battery. IC2 boosts the battery voltage, VBATT, to 5V, and IC3 buck-regulates...

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Control Radio Remote Control Using Base DTMF Circuit

This circuit of a remote control unit which makes use of the radio frequency signals to control various electrical appliances. This remote control unit has 4 channels which can be easily extended to 12. This circuit differs from similar circuits in view of its simplicity and a totally different concept of generating the control signals. Usually...

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Control Format Short Message Service

At command for communications with SMS-CENTER.At hand phone GSM there is facility to data access applies serial connection, for data access is required by instruction sequence at interface hand phone. ETSI (European Telecommunication Standard Institute) that is the instruction standard in technical specification GSM. instruction phone is started with character AT and terminated with enter or 0Dh. Command received will be response...

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Control Analog-input circuit for microcontroller

The simple ADC in the figure 1 is perfect for getting analog signals into a purely digital microcontroller. Using just five surface-mount parts, you can assemble it for less than 50 cents (1000), which is approximately half the cost of a single chip-ADC approach in the same volume. Moreover, this design takes only one pin from the microcontroller...

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