Hi all, this is my first instructable documenting the creation of my project, the Arduino UNO BASIC shield which turns the Arduino UNO into a computer running the BASIC programming language.
As microcontrollers are essentially low performance computers on a chip (they have a processor, RAM and ROM) they can be used to create small computer systems. The aim of this project was to use AVR microcontrollers to create a computer capable of running the BASIC programming lanuage.
During learning about the Arduino and creating various sketches, I came across the TinyBASIC project which turns the Arduino into a computer by running a BASIC interpreter. After testing the TinyBASIC sketch on my Arduino UNO, I found the available program memory to TinyBASIC to be fairly low at around 1KB which led me to purchasing an ATmega 1284P. After successfully getting TinyBASIC to run on the 1284P, I found the program memory available to be more than 13KB meaning more than a 13x increase in available memory compared to the Arduino UNO.
Being able to run TinyBASIC on the 1284P then led me to think about standalone computers based on the 1284P and TinyBASIC. I alerted the TinyBASIC sketch to include the TVout library and the PS/2 keyboard library but it would not work (due to the PS/2 library and TVout library not being compatible with each other) meaning I needed a second AVR running either the PS/2 library or the TVout library to allow the computer to function correctly.
I decided to use the Arduino UNO which is based on the ATmega 328 to run the TVout sketch while the 1284P would run the TinyBASIC sketch (with the PS/2 library included); it was done this way around to give TinyBASIC the maximum amount of SRAM possible as TVout requires a RAM buffer.
I knew from previous projects that TVout runs fine on the Arduino UNO and after testing TinyBASIC with the PS/2 library on the 1284P (which worked correctly) I decided to place all components on an Arduino UNO shield.
Step 1: Required Components
The components required for the shield PCB are as follows:
1 x ATmega 1284P
1 x DIP40 IC Holder Socket (0.6" wide)
1 x RCA Socket
1 x PS/2 Socket
1 x 470Ω Resistor
1 x 1KΩ Resistor
1 x 220Ω Resistor
1 x 40pin Male Header Strip (to be cut down)
1 x 40pin Female Header Strip (to be cut down)
1 x 5mm LED (This PCB uses an orange LED)
1 x PCB / Arduino Prototype Shield / Stripboard (dependent on how the shield will be made; I created a PCB)
Additionally, solder, a soldering iron, optionally desoldering braid and tools (wire cutters and needle-nose pliers) are needed.
Note this PCB is dual layer. Due to the way I designed this PCB, I also used some 0Ω resistors as jumpers and some tinned copper wires to jump between the layers. The final setup also requires an Arduino UNO, PS/2 keyboard, RCA capable display (such as an LCD TV), RCA cable and a power source (such as a wall mounted PSU).