This is a really easy to do video game system with a LED screen.
I made it trying to keep it as tiny and cheap as possible.
It uses only one IC, a PIC16F628A and 9 bipolar transistors, has 4 buttons for control and a swich for turning it off.
It also has a tiny speaker for making some sounds.
The power is given by four ni-mh batteries, and the consume is so reduced and you will keep them charged for a long time.
Games: So far I have only programed three games but I gonna do more in the near future (see steps 9,10,11 and 12 for more info about the games).
I hope you like this instructable and make your own portable game system.
Ps: I am from Argentina so let me know for any grammar mistake.
Step 1: Stuff you need
It just use some electronic components, most of are them recycled.
Transistors: Use 9 transistors BC548 or similar.
Even 2N3904 can be used but their terminals are opposite, very careful when soldering if you choose these ones.
LEDs: they are at the forefront of this project. Only the four lower LEDs are RGB, the rest are common red LEDs.
If the light is different from the LEDs you can diffuse then using a sandpaper.
Switches: try to get good quality switches. I used switches from a monitor for the shoulder buttons and I bought the front ones.
9 - 1k ohm
4 - 220 ohm
4 - 10k ohm
1 - 560 ohm
1 - 100 uf
1 - 100 nf
Microcontroler: PIC 16F628A
Misc: An on/off switch, a piece of plastic, 8 screws, 8 spacers, 1 piezo transducer (the little speaker that looks like a coin).