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PROJECT 17 – Using a Digital Temperature Sensor Function This project shows how we can interface a DSI620 type digital temperature sensor to our microcontroller. The ambient temperature is measured con- tinuously and then displayed in degrees centigrade on three TIL3II type alphanumeric displays. Positive temperature is displayed from 0oC toI25oC. Negative temperature is displayed […]
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Temperature measurement and control is one of the most common applica- tions of microcontroller-based data acquisition systems. Four types of sensors are commonly used to measure temperature in commercial and industrial applications. These are thermocouples, resistive temperature devices (RTDs), thermistors, and integrated circuit (IC) temperature sensors. Each sensor has its unique advantages and disadvantages and […]
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BINARY NUMBERS The binary number system is a set of rules and procedures for representing and processing numerical quantities in digital equipment. Because the base of the binary number system is 2, only two symbols (0 and 1) are used to represent any quantity. The symbols 0 and 1 are called binary digits or bits. […]
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CABLE TELEVISION It is estimated that about 15% of all U.S. citizens get their TV over the air with an antenna. But over 70% get TV via cable. The remaining 15% get satellite TV. Why? Mainly because cable offers not only better, more reliable signals than by antenna, but also offers hundreds of channels of […]
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CABLE TELEVISION It is estimated that about 15% of all U.S. citizens get their TV over the air with an antenna. But over 70% get TV via cable. The remaining 15% get satellite TV. Why? Mainly because cable offers not only better, more reliable signals than by antenna, but also offers hundreds of channels of […]
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PROJECT 16 – Electronic Organ (Using the Timer Interrupt) Function This is a simple electronic organ project. A small speaker is connected to bit 0 of port 3 via a MOSFET transistor. Eight push-button switches are connected to port I to act as the keyboard for the electronic organ. Timer I of the microcontroller is […]
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PROJECT 15 – Electronic Siren (Using the Timer Interrupt) Function This project shows how we can interface our microcontroller to a small speaker type audible device and generate a siren sound. When power is applied to the circuit, a continuous siren type sound is output from the speaker. Both timer 0 and timer I of […]
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PROJECT 14 – Two-tone Small Speaker Interface (Using the Timer Interrupt) Function This project shows how we can interface our microcontroller to a small speaker type audible device and generate two different tones. When power is applied to the circuit, a continuous single tone of frequency I kHz is output to the speaker. When a […]
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PROJECT 13 – Small Speaker Interface (Using the Timer Interrupt) Function This project shows how we can interface our microcontroller to a small speaker type audible device. In this project a continuous single tone output is produced on the speaker when a push-button switch is activated. Timer interrupt of the microcontroller is used to generate […]
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In this chapter we shall be looking at how we can interface our microcontroller to sound generating devices. Sound projects are based on audible devices and these devices have many applications in electronics, ranging from warning devices, burglar alarms, speech processing applications, electronic organs and so on. Electronic sound generation requires an electronic audible device. […]
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