The MC74HC595A consists of an 8?bit shift register and an 8bit type latch with three state parallel outputs. The shift register accepts serial data and provides a serial output. The shift register also provides parallel data to the 8bit latch. The shift register and latch have independent clock inputs. This device also has an asynchronous [...]
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atmega development board with rs232
8535/16/32 AVR development board series, designed for learning the input / output such as LCD, push button and also has been equipped with RS232-based serial communications using the max232. Now, you can create your own without having to buy. hopefully can help… Keyword : development board ,microcontroller ,project ,programmer ,processor ,microcontrollers ,interfacing ,download ,connector ,programmers [...]
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ATmega PCB Design with RS232
Minimum system ATmega 8535/16/32 schematic circuit that is integrated with RS232 serial communication. Minimum System is a microcontroller circuit that used to work. This circuit usually consists of: 1. Crystal = to generate pulse 2. a series reset = to do the “Restart” work microcontroller Components that can be used as input and output such as: 1. display = LCD, dot [...]
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Making Scrolling Text On Dot Matrix
Scrolling text in the dot matrix is used as the IC 74HC595 shift register to set the column (column drivers). PortB on set as an output that is connected to the 74HC595. PortB.0 as the data released, PortB.2 PortB.1 as clock and data set as a latch or the reverse of the data released on [...]
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Analog to Digital Converter (ADC) on ATMega8535
ATmega8535 provides the ADC with a resolution of 10 bits. ADC is connected to 8 channel Analog Multiplexer which allows formed eight single-ended input voltage is ADC0 to ADC7. Can also be configured into seven differential input channels with ADC1 as the common terminal and the other negative as a positive voltage input. Or a [...]
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SENSORS FOR DEAD RECKONING
Sensors for Mobile Robot Positioning SENSORS FOR DEAD RECKONING Dead reckoning (derived from “deduced reckoning” of sailing days) is a simple mathematical procedure for determining the present location of a vessel by advancing some previous position through known course and velocity information over a given length of time [Dunlap and Shufeldt, 1972]. The vast majority [...]
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Band theory of solids
Quantum physics describes the states of electrons in an atom according to the four-fold scheme of quantum numbers. The quantum numbers describe the allowable states electrons may assume in an atom. To use the analogy of an amphitheater, quantum numbers describe how many rows and seats are available. Individual electrons may be described by the [...]
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Valence and Crystal structure
Valence: The electrons in the outer most shell, or valence shell, are known as valence electrons. These valence electrons are responsible for the chemical properties of the chemical elements. It is these electrons which participate in chemical reactions with other elements. An over simplified chemistry rule applicable to simple reactions is that atoms try to [...]
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Current mirrors Transistors
An often-used circuit applying the bipolar junction transistor is the so-called current mirror, which serves as a simple current regulator, supplying nearly constant current to a load over a wide range of load resistances. We know that in a transistor operating in its active mode, collector current is equal to base current multiplied by the [...]
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Transistor:Input and output coupling
To overcome the challenge of creating necessary DC bias voltage for an amplifier’s input signal without resorting to the insertion of a battery in series with the AC signal source, we used a voltage divider connected across the DC power source. To make this work in conjunction with an AC input signal, we “coupled” the [...]
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transistors : Biasing calculations
Although transistor switching circuits operate without bias, it is unusual for analog circuits to operate without bias. One of the few examples is “TR One, one transistor radio” TR One, Ch 9 with an amplified AM (amplitude modulation) detector. Note the lack of a bias resistor at the base in that circuit. In this section [...]
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Transistor : Biasing techniques
Biasing techniques In the common-emitter section of this chapter, we saw a SPICE analysis where the output waveform resembled a half-wave rectified shape: only half of the input waveform was reproduced, with the other half being completely cut off. Since our purpose at that time was to reproduce the entire waveshape, this constituted a problem. [...]
