Let's Make Robots!

Memory

1990, new technology (LOL)

Well, do you remember what year you got your first computer and what the specs are?

I know, it was a ATARI130XE with 1.79MHz and 128kB RAM. running with a Datasette/tape cassette player to save and load programs. The OS was the Atari OS. You can find the details here: Atari 130XE

Area mapping

I have (that is relative because I have not yet ordered my first parts from Robotshop) a PING ultrasonic sensor. I'll be having an arduino mini - though I'll no doubt buy something bigger after - and I wonder if I can efficiently make my upcoming rover (differentially driven, nothing special really) map it's surrounding area using a grid. Is it possible or will I run short on memory with the arduino mini? And more importantly, I need help with the code (I have 0 experience with code, though I have enough theory I guess...). Any suggestions are appreciated.

UNIO memory breakout board

A few weeks back I aquired some memory chips(samples rock). These are the special unio memory chips, essentually 1 wire for both input and output. As this is an 8 pin chip with only 3 of the pins being useful, I decided to try to make a simple breakout board with some small 5x5 hole pcb boards I grabbed from SF. These unio chips can be used with the20x2, 28x2 and 40x2 and the three pins are vcc, vss and I/O. The chip id is 11aa040(4k memory)

As recommended, I've added a small pullup resistor to the board. This is the results of...

SF order on it's way[shipped!]

Since it's been a while since anyone has posted on this forum, just thought I'd post something.

Finally put my order in thats been in the cart on that fateful freeday. added a couple extra things to it as well since I have a mini project going.

Opted to get the polulu trex motor driver as well since my hbridge attempt has yet to work(though I haven't tried to trouble shoot it for a while) .

Got a couple of 20x2's to see what they are like and since they had some sweet hw access. Grabbed a couple of atmel 2313's since they have built in uarts.  

Price: $12.9 USD
If you've been thinking your robot needs more memory or the ability to record/playback sounds like Frits's Drum machine or even if you just want to play with i2c … Read more
Tips on EEPROMS, i2c, scratchpad and variables
The picaxe 28X1 has some very cool memory features that can be used to free up program space or to give your robot a more convenient user interface. This post … Read more

External Memory Reader

Oi all,

I was finally going to get my RFID chips (I hope... maybe) and I was thinking that I wanted a way to store a database for RFID tags and actions like a database storring the ID number and if they are level 1 allowance or level 2 allaowance, etc. that way I can not only select what I can allow the person to do in a situation, but I can also easilly add people from my computer or phone (if I use Micro SD). 

Basically I want a way to read a txt file from the root of a data storage device - I'd prefer SD but Thumb drive is my next preference.