Let's Make Robots!

Serial vs I2C Motor Driver

Hi  everyone,

I was ready to get this serial motor driver from Sparkfun but then came across this I2C motor driver from Seedstudio. I would like to hear if you guys have a preference. I am new to serial communication with arduino but here is what I am thinking so far


- looks easier to code

- larger delay to recieve data?


LDR vs Ir Phototransistor

Hi  Everyone

I'm doing research for my first bot from scratch. I was hoping someone could point me to a good source of info on the advatages/disavantages of using LED & LDR vs Ir with Phototransistor for proximity sensors.

My basic goal for them is to have an edge detector in each corner and a line following array. I thought the LDRs would a simple and cheap approach but was surprised to see how cheap this Ir LED & Phototrasistor set was.

Anyone have Tamiya Track and Wheels?

I was wondering if anyone could give me the sizes of the drive sprockets for the Tamiya 70100 Track and Wheel Set. I am trying to figure out some gearing if I go for it but can't find the sprocket sizes anywhere. Thanks

Has anyone used the Solarbotics GM17?

Just wondering if anyone has tried these vs the GM8 or GM9. I am thinking of trying them and maybe getting the conversion gears to put in later for more speed. I thought they might be good with some treads to grunt over stuff! Feel free to throw out some other options too!

Motor Driver Choice Help


   I've built a Parallax Boe-Bot which has servo driven wheels but have decided to move to Arduino and dc motors. I do not have specific motors in mind yet just some salvaged ones to play with for now. So my questions are:

1 - Is it worth getting a driver shield/kit or should I save the money and try something like a l293d on my breadboard?

2 - What shield/board do you recommend? I was considering the following: