MicroSimon

This project shows how to create an MB Electronics Simon game clone using an 8-pin PIC12F683 microcontroller. The game includes a full emulation of the original Simon 'game 1' and the ability to select from 4 skill levels which control the number of colours you must repeat in a sequence in order to win the game.

The project was created for Sparkfun's microcontroller competition 2011 and aims to demonstrate an number of useful design techniques which can be used when working with low-pin count microcontrollers. The code is written entirely in C and fits neatly into the 2K of available program flash on the chip. The PCB is only 1.5 inches square and uses both SMD and through-hole components, however it is perfectly possible to recreate the project using larger components on a breadboard or a small piece of strip-board.

The game is powered by a standard CR2032 3V lithium cell which is mounted on the underside of the game. The design uses the ultra low power standby feature of the microcontroller meaning that no power switch is required. Overall power consumption is kept to a minimum by using the internal oscillator of the PIC running at 4Mhz.

You can see a video of it in action over on youtube

Step 1 Parts List

The MicroSimon hardware consists of the following parts:

* 1 x PIC12F683 SOIC 8-pin microcontroller
* 5 x 10K resistors (1206 SMD)
* 1 x BC817 NPN Transistor
* 1 x 100nF capacitor (0805 SMD)
* 4 x 3mm LEDs
* 1 x CR2032 battery holder
* 5 x Tactile push-button switches
* 1 x QMX-05 speaker
* 1 x 6 pin 2.54" right angled header

Comments

[nodoubtman]

I have used Colin Mitchel one's with a pic16f84A : http://www.talkingelectronics.com/te_interactive_index.html

it is great! :)
congradulation Colin!
Keep the good work!
marC:)

[nodoubtman]

2n3904 is okay?

[simoninns]

It should be fine. I've never used one myself, so I can't be 100%. The application is a very basic one though, so pretty much any NPN would probably do the trick.

[nodoubtman]

any other substitute for bc817?

thank you!
marC:)

[simoninns]

Any small signal NPN would do (like a BC337 for example).

[nodoubtman]

2n3904 should work?

do you have a bigger schematic please? i don't see much on this one

thank you!
marC:)

[simoninns]

Follow the link in my profile to my website; there you will find better pictures of the project.

[Stanh11]

is there any other pic that i can use i cant find that pic where i live

[simoninns]

I would think that any similar PIC12F should do the trick. You will need to alter the fuse settings accordingly though.

[Stanh11]

what about the PIC12C508A the only difference i see is the memory this one is EEPROM and yours is flash

[simoninns]

I can't say I've played with that many types of PIC12F to really give you good advice (I usually work with 18Fs). Microchip have an on-line product selection tool which you may find useful:

http://www.microchip.com/productselector/MCUProductSelector.html

[Stanh11]

i have another question you have your own pic programmer or you using pickit?
because pickit is expensive and i would like to make my own programmer if i can

[Stanh11]

thank you this is my first project with a pic im kinda confused because i dont know much about pics but ill try to do this thanks for this tutorial

[Tolaras]

Hello!

Really nice project! Congratulations!

I have one problem though. How can I assemble all these .c and .h files to an .asm file in order to load them to the PIC microcontroller? I tried microC for PIC and MPLab IDE but I couldn't managed it.

Thanks!

[simoninns]

The source code is for MPLAB with the HiTech PICC18 compiler which you can download for free from Hi-Tech's website. The code will not work with microC or microchip C18 compilers without alteration.

Hope this helps!

[Tolaras]

I 'll try it later today..

Thanks!

[Grazfather]

Nice. I like this a lot and I have a few 12f683's sitting around. Nice code, too.

One totally useless tip:

randomNumber++;
if (randomNumber == 5) randomNumber = 1;

could be

randomNumber &= 0b11;
randomNumber++;

to get rid of the branch, not that you have such a busy loop that you need to save instructions...

[simoninns]

@Grazfather - You could actually do it in one line using the mod operator, something like:

randomNumber = (randomNumber + 1) % 5;

But there is always the trade-off between code readability and memory efficient coding. I always go the 'readable' route unless I really need to save some bytes.

[notsure]

Very well done!