Project 1 in "What's a Microcontroller"?

fjohnson

I'm a newbie to this MC stuff. I am following the Parallax book, What's a Microcontroller? In chapter 2, at the end (pg. 68), there is a project I cannot make work. I have looked over the code several times with no success. So far all has gone as the book says it should except this. Any help please.

Frank

Mike Green

First thing you have to learn is how to communicate usefully via the forum. We're not at your side and we don't know what you've tried so far nor what you've learned already. If you're talking about the project description in the middle of page #68, there are several pieces that are built on previous problems. What have you successfully done so far? Obviously something has gone wrong with combining the various pieces (flash this LED, flash that LED, etc.) You need to post your source code as an attachment to your next message. You should also attach a schematic if possible or a clear picture of your breadboard or a clear description of what's connected to what including which end is which for those things with "ends". Lastly, you need to describe clearly what you mean by "I cannot make work". How far have you gotten? What works and doesn't work?

fjohnson

Thanks

Below·is my source code

Everything in Chapter 2 prior to Exercises, worked OK.· I think it matches the code on pg. 69 & 70 in the book.

When you 'Run', the Red Bi-LED comes on and at the same time the Yellow comes on and flashes for 10 seconds. The Red stays on solid for the same 10 seconds the yellow is on. It should be on for 3 seconds, then the Yellow is to come on and flash. After the Yellow stops flashing the Green comes on and stays on, the Red does not follow as it should.

The schematic is as follows: Matches Yellow LED on pg. 48. The Bicolor matches pg. 64.



'WAM - Chp2 Project.bs2
'Page 68

' {$STAMP BS2}
' {$PBASIC 2.5}

DEBUG "Program Running"

counter VAR Byte

'Red for three seconds········ 'Bi color LED Red
HIGH 15
LOW 14
PAUSE 3000

'Green for 10 seconds
LOW 15························ 'Bi color LED Green
HIGH 14

'.....WHILE the Yellow LED is flashing

FOR counter = 1 TO 10

HIGH 13······················ 'Yellow LED on
PAUSE 500
LOW 13······················· 'Yellow LED off
PAUSE 500
NEXT

'Red stays on················· 'Bi color LED Red
HIGH 15
LOW 14

Mike Green

The program appears to be correct. If you followed the drawing on page 48, you probably forgot to connect the LED (Yellow here instead of green) to I/O pin 13. You may have connected the Bicolor LED incorrectly as well. Check the connections. Your program assumes that the Bicolor LED is connected between pins 14 and 15 and the Yellow LED is connected between pin 13 and Vss (along with their current limiting resistors).

morgandeo

Hi
If you want to know all the things about a microcontroller than you are going to want a book. There are a lot of different microcontrollers from different manufactures.
I have few information on 8051 microcontroller.
microcontroller consist of only these part;
1. CPU
2. Ram
3. Rom
4. I/O
5. Alu
6. Timer