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This book is about designing a microcontroller based alcohol detector device, also known as a breathalyzer device. The designed device basically consists of an alcohol sensor chip, a microcontroller development system, a text based LCD display, 3 coloured LEDs, and a speech processor module. The user blows onto the alcohol sensor through a small plastic tube. The alcohol sensor generates a voltage proportional to the measured alcohol level. This analog voltage is fed to the A/D converter input of a PIC16F887 microcontroller. The microcontroller processes the signal and calculates the actual...

A microcontroller is a single-chip computer. Before the invention of the microcontrollers most intelligent systems were designed using microprocessors. A microprocessor is the processing element of a computer, consisting of an Arithmetic and Logic Unit (ALU) and the Control Unit (CU). A microprocessor on its own is useless and it has to be supported by a large number of peripheral chips, such as memory, input-output, timer, interrupt logic and so on. Currently there are many microcontroller chips manufactured by various companies. This book is based on using the highly popular PIC16F887 type...