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EEE305 Microcontroller Systems

This lecture covers the process of analogue to digital conversion using PIC microcontrollers with a focus on C programming. The session outlines how to read ADC values, convert them into a scaled output for visual representation, and use the USART serial port for outputting results. An example is provided for creating a thermometer application that translates thermistor readings into temperature displays. Code examples, along with detailed explanations of data types and scaling, will enhance understanding of microcontroller systems in EEE305.

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EEE305 Microcontroller Systems

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  1. Lecture 8: Analogue to Digital Conversion using PIC microcontrollers and the C compiler (NB As of 18/04/13 this code uses the older HTC compiler, I will change it to the more modern XC8 compiler in class) Teaching resources are at www.eej.ulst.ac.uk My office 5B18, telephone 028 90 366364 My email IJ.McCrum@ulster.ac.uk EEE305 Microcontroller Systems http://www.eej.ulst.ac.uk/~ian/modules/EEE305

  2. Datasheet Chapter 11

  3. C Code to read ADC and O/p reading

  4. Last week’s code to use USART serial port

  5. Main code to test ADC

  6. Further experiments • If the ADC returns a number from 0 to 1024 • Scale this to 80 (the width of a PUTTY screen) • Use a for loop For(i=0;i<scaled_reading;i++){putchar(‘*’);} Printf(“\r\n”); • This will print a “graph” across the screen.

  7. Making a Thermometer • Assume the thermistor initially reads 20 degrees • After holding for 60 seconds assume it reads 35 degrees • Scale the readings to display degrees • i.e If you get a reading of XX for 20 degrees and YY for 35 degrees. Don’t forget to use variables of type float if they are needed 35⁰C ??⁰C 20⁰C XX ZZ YY

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