Hello people, I'm new to electronics and trying to build a land-rover caaar. I found out Arduino Uno and quite understand the initial steps I need to take to get started with it and go on to build my car. I learnt that Arduino Uno isn't available locally and is too costly when I order it from another city (I'm in India). But while checking a local shop, the guy showed me the P89V51RD2 ( 8051 ) controller. I didn't buy it right away but came to do a bit research. My initial findings were that it's quite more powerful than the Arduino Uno. I bought it for Rs. 1000 (~$25). Now I am sitting on my desk thinking about what I am supposed to do with this. What I basically plan is to hookup this board, a breadboard, an L293DNE IC and two motors together. But I can't understand where should I start. Answering a few questions would aid me a lot : 1 - What's difference between the 89V51RD2 I bought and Arduino Uno? 2 - What should I do to start porgramming ( in C? I'm familiar with programming languages so this part isn't the problem at all )? 3 - The board has a serial port. I tried to connect it with the SERIAL PORT-USB converter I bought but windows isn't showing anything other than "Unknown device found" even after I installed the drivers for the converter. 4 - I am supposed to connect some power supply to the board before starting to work on it. I can see three 4-pin terminals labelled 5V,GND 12V. I have three 9V batteries. I can adjust the voltage with resistors, that's not the problem, but how exactly am I supposed to connect the supply? There are 4 pins for each of them. Can I connect the positive terminal to "5V" and negative to GND and leave the "12V" open? Thank you, all!