Leigh House Hospital

In this chapter, we are going to move on from the series RL and series RC circuits we looked at in Chapter 6 , to look at the series RLC circuit. We will explain why this circuit is one of the most important audio circuits. We will learn about resonance, selectivity, Q, and bandwidth.

In this chapter, we will look at the FET, or field effect transistor. This is an alternative semiconductor device to the BJT. We will study the makeup of the various FETS to understand how they work. Then we will carry out some experiments to determine the main operating characteristics of the different FETs and so learn how to use them. It is important to appreciate how these devices work at the semiconductor level, as it is only then that the engineer can appreciate why these devices work in the way they do.

This book introduces readers to using one of Microchips advanced PICs, the 32bit PIC It also provides an overview of basic programming in C.

In this chapter, we will continue our investigation into creating a very useful program, that of the Real-Time Clock. In Chapter 9, we looked at simply using the secondary oscillator to drive a 24-hour clock display. We wrote two programs, one for a simple LCD display and the other for a module with four seven-segment displays. In this chapter, we will look at using an external module that can be attached to the PIC32.

In the last chapter, we looked at using the SPI module of the PIC. This is probably the simplest method of serial communication, as it does not use a protocol. In this chapter, we will look at a process, which does use an industrial protocol, that is termed I2C. We will also study how we can use an I2C expander module and program it, with the 32-bit PIC, to send messages to an LCD.

In this chapter, we will learn about Bluetooth communication. We will study how the PIC18F4525 can use a suitable Bluetooth device to send and receive instructions from your mobile phone. We will create a project where we can control some devices in our home from our mobile phone. We will also look at using the HC-SR501 PIR motion sensor. We will program the PIC to display a message on the LCD when the sensor senses some movement.

In this chapter, we are going to look at using the I2C communication protocol. We will study the 24LC256, a serial EEPROM that uses I2C, and the TC74, a temperature sensor that also uses the I2C protocol. We will create a program that will communicate with both these devices using the PIC as the master device.

The size and size variability of bis-MPA dendrimers is shown to be smaller by DOSY-1H NMR than their linear analog, PBBM. This was accomplished using five different solvents and for the first time confirms, experimentally, what has been theorized.

In an effort to reduce the amount of text in the program listings and reduce the amount whereby I simply repeat myself, let’s create and use a series of header files. Header files are used when your programs use the same series of instructions in exactly the same way in all your projects and programs.