Let's Make Robots!

L6203 motor driver

Hi, I'm making an RC car and as motor driver I'm using the L6203.

It has 2 inputs, 1 for pwm and 1 for a bit to choose direction.

But it doesn't seem to work.

Can someone help me with figuring out how I can program it?

ATmega328 EEPROM Options?

I would like to utilitize the 1K of EEPROM on a Pro Mini project to store variables/arrays of type int and float, but without much knowledge on the topic, the direction to go is not clear. EEPROMex or EEPROManything or something else. Are any of these options deprecated or just unnecessarilly overly difficult? I hope to get some advice on the most up-to-date libraries/techniques LMRians are using. I enjoy the learning process and a nudge in the right direction would be appreciated.

Ping Sensor and Led use

Hey guys,

I was wondering if you could offer advice.

I have built the avoidance robot.

I would now like to add to it.

I would like to add leds and 

possibly a speaker, so when the 

robot approaches a wall maybe the leds turn on. When it reverses maybe it beeps.

How would I do this.?

How do I incorperate it into the code. 

By this I mean say for example

If ping distance is less then 5cm then: led on

type of thing?

My coding is practically non existant. I am still learning

cooling fan

Hi all,

Does anyone know, if a cooling fan should blow air over a heatsink, or suck air over a heatsink?

Keep the answers clean, please guys.


(Link to ridicule page.)

Building my first Bot: Quadruped

I just completed my first Quadcopter and was looking for a new project to keep me busy when I came across some 3D printed Quadruped and hexapod chassis'. So now I want to build a Quadruped. I've got two to choose from below..... An 8 servo model [IMG]http://i1254.photobucket.com/albums/hh601/Duhjoker1/Quadruped/D6A66983-2AA0-47CE-8F47-15D51A76EA38_zpshxlz2dap.jpg[/IMG] And a 12 servo model [IMG]http://i1254.photobucket.com/albums/hh601/Duhjoker1/Quadruped/333312B7-1DC4-4FE7-B444-2B5A0C626174_zpsqpjm1so0.jpg[/IMG] I would much prefer the 12 servo model for more articulation.

Powering Arduino Nano from a 3.7 V LiPo battery


I've been investigating about powering an Arduino nano with a 3.7 V battery, but so far I found that 5 V is recommended. However I found some projects online with a 3.7 V (Lipo or not) and working:


Do you any have experience with this? Thanks!

vpn for china

So I've found myself in Shijiazhuang in China and will be here till the 12th June. I can't access youtube or google and I just wondered if anyone might know a decent vpn software to get around the Great Wall.

I downloaded one from cnet but it didn't register and installed some other crap I didn't want. Is there a reliable recommendation or is there no hope of getting normal access here?

servo motor with 360 control

Hi there,

I was wondering if there are servo motors out there that can turn 360 degrees and beyond and still act as a servo motor where it can go to specific position and have holding torque.


T'REX robot controller


The T'REX robot controller makes controlling robots easy!

The Arduino compatible controller comes pre-programmed with sample code that lets you control it with a supplied Android app, Radio Control or with an external controller via I²C.