1. EEE305 Microcontroller Systems 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.ukwww.eej.ulst.ac.uk My office 5B18, telephone 028 90 366364 My email IJ.McCrum@ulster.ac.uk http://www.eej.ulst.ac.uk/~ian/modules/EEE305 1/

2. Datasheet Chapter 11

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

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

19. Main code to test ADC

21. 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.

22. 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. 20⁰C 35⁰C XXYYZZ ??⁰C Don’t forget to use variables of type float if they are needed