Will This program work


Closed Thread
Results 1 to 3 of 3
  1. #1

    Default Will This program work

    Hello.

    I am new to this as I explained in previous thread.

    i am creating a tilt sensor as a project.

    I have a board that has two accelerometers on it. The accelerometers are fed into my pic18F242 microcontroller. I want the microcontroller to spit out what the accelerometer reading is in digital format so i can read it via hyperterminal on my computer.

    If that works i will feed the accelerometer data to an RF device and do it remotely but i have to see if i get data from microcontroller first.

    Does this program look like it will work?

    ************************************************** *****

    DEFINE ADC_BITS 10 ' Set number of bits in result
    DEFINE ADC_CLOCK 3 ' Set clock source (3=rc)
    DEFINE ADC_SAMPLEUS 15 ' Set sampling time in uS

    tx var portB.0
    rx var portA.0
    n9600 con 16468

    adcVar VAR word[4] ' Create variable to store results
    channel var byte
    byteVar var byte[4]
    inByte var byte


    ' set Sleep pin high:
    ''HIGH PORTD.0

    ' Set PORTA to all input
    TRISA = %11111111

    ' Set up ADCON1:
    ' All are analog inputs
    ADCON1 = %10000000

    main:
    ' read all channels of the accelerometer:
    for channel = 0 to 3 ' read the two accelerometers from pin 0 - 3
    ADCIN channel, adcVar[channel]
    ' convert to a byte:
    byteVar[channel] = adcVar[channel] /4
    pause 1
    next

    ' send results out the serial port:
    serout2 tx, n9600, [byteVar[0],byteVar[1],byteVar[2], byteVar[3]]
    GoTo main

    ************************************************** *****

  2. #2
    Join Date
    Nov 2003
    Location
    Greece
    Posts
    3,795


    Did you find this post helpful? Yes | No

    Default

    It looks OK to me (except the Next which is orphan! Needs the variable to increase), but sure only testing will prove this.

    A couple of improovments:

    Since the chip you intent to use has UART why not use the HSEROUT command instead SEROUT2?

    Like this

    HSEROUT [bytevar str\4]

    Also I don't quite understand why do you use the

    byteVar[channel] = adcVar[channel] /4

    If you want to convert the 10-bit ADC result just type this:

    byteVar[channel] = adcVar[channel] >>2

    and the 10-bit result will be converted to 8-bit.

    Even better use the DEFINE to set ADC to 8 bits.

    So it might be like that:

    main:
    ' read all channels of the accelerometer:
    for channel = 0 to 3 ' read the two accelerometers from pin 0 - 3
    ADCIN channel, bytevar[channel]
    pause 1
    next channel

    ' send results out the serial port:
    Hserout [byteVar str\4]
    GoTo main

    Ioannis

  3. #3


    Did you find this post helpful? Yes | No

    Red face

    How did i ever live my life before the days of the internet. Thanks a lot for your advice I will modify my program and test it out. Any other advice someone has?

Similar Threads

  1. Help with DS18B20 program
    By presario1425 in forum mel PIC BASIC Pro
    Replies: 38
    Last Post: - 22nd August 2012, 01:50
  2. My PIC program won't work! Plz Help?!
    By beckyzammi in forum mel PIC BASIC
    Replies: 2
    Last Post: - 4th March 2010, 19:26
  3. Making Program Code Space your playground...
    By Melanie in forum Code Examples
    Replies: 15
    Last Post: - 19th July 2008, 09:26
  4. Replies: 5
    Last Post: - 5th February 2006, 17:51
  5. Simple Interrupt Program
    By eoasap in forum General
    Replies: 5
    Last Post: - 28th October 2005, 17:22

Members who have read this thread : 1

You do not have permission to view the list of names.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts