Let's Make Robots!

Making a PING sensor control a DC motor

Hi, guys. I'm kinda new to this robot-scene. I've been doing it for about 3 days i bought a arduino uno r3 and a few other odds and ends to make a simple robot. ive got 2 DC motors(3v), A PING sensor, and everything else to make a robot(don't feel like going into detail lol). I know how to run the motor and the sensor by themselves but i need some help making the sensor and the motor cooperate. Any ideas


P.S. i have programming knowledge so i dont need it (dumbed) down lol

Sneak Preview of Navigate & Map (NaM) (XMOS)

Well, here's the early beginnings of my Xmos project.

A dead PS2 mouse, a micro servo, a Sharp GP2D12, and a WowWee Bugbot.

Yes, this is half (well, okay, slightly less than half) of the project. Figure I'll just build one to start off. Once I make it work then it's easier to build the second one.

Price: $0.45 USD

 Collected by one member
This 0.05" diameter, 1.75" long by 0.6" wide flat-ended hex key works with small hex screws, such as the set screws included with our mounting hubs. Read more

Arduino vs. Picaxe syntax

The idea of this thread is to provide a place for asking question about the SYNTAX of the Arduino and Picaxe languages. I invite everybody to do the same and I'll be happy to help with Arduino syntax. Perhaps we can create a basic "dictionary" between the two and hopefully this will help the users of the respective platforms to SHARE code.

Perhaps we're not so different after all :)


Here is something to get us started:


xmos progess anyone?

Calculon recieved a note from his lovely postman indicating that he will get it on monday. :)

From what he's been able to read, he gets the impression that almost all mechanics/electronics (motor control, LED control, adc, sensor-type switches, and so on) must be handled by other ICs that communicate to/from the xmos board with serial ...

Is that right, or is there something he doesn't understand yet?

translate or change the code

I need an expert in C/C++ programming to help me translate a fairly complex piece of C code  following line robot into matlab code. the C code is from webots software. The original author of the code can't do it, but we have his permission to do it.


Please reply here or PM me if you're interested. Thanks. 

Nonbots in the robots section - "tisk tisk" or "boo woo"?

Should we ban all nonbots from the robots section? You know: robots that are not. That do not even exist? Ideas for an upcoming robot that only exist in the maker's mind. Maybe on a scrap of paper. Maybe the materials are "in the mail"?

I really don't like it when people post such projects. I don't care if the robot turns out to be really awesome real soon or if the idea never comes to fruition. I just feel that the robots sections should be reserved for actual projects that actually have something to show.

What are we, the Nobel Committee?

Price: $4.95 USD

 Collected by one member
This semiconductor gas sensor detects the presence of methane (CNG) gas at concentrations from 300 ppm to 10,000 ppm, a range suitable for detecting gas … Read more

Where to put clamp diodes in a SN754410 motor controller circuit?

After a quick Google search, I couldn't find a schematic for the SN754410 with the clamping diodes. Instead I found this document which uses the L293. Could I use it to build the motor controller with the SN754410? What changes would I need to do to use one motor per IC to double the max continuous current? I have some 1N4006 diodes, could I use them in this circuit?




Which MOSFET to use for battery voltage measurement?

Hello all,

I'm currently building a buoy with a string of sensors that measures temperatures at different dephts. I'll be making a blog or Something Else later.

The thing is, I want to measure the voltage of the battery (Li-Po) to be able to predict when it needs to be charged since the system will operate "out-there-in-the-middle-of-nowhere".

Makes a loud, piercing noise!
If anyone would like a look, I've posted a 3D printed loud noisemaker on Instructables and Thingiverse -  The Orange Screamer -  which is proving to be rather … Read more

how to calculate motor strength?

Is there a common formula for finding required motor strength?

If I know the total bot weight and wheel diameter, could I find out what kind of motor I need. I know that gearing will come into play, but I dont know anything about these physics thingys so I choose to phrase the question as vaguely as possible.. 

Like, what kind of specs would a motor for a scooter (with me on top of it), doing 35km/Hrs require

or,  an offroader weighting 10K, doing 3km/Hrs with 10cm big wheels in rough terrain?

DreamMaker Overlord sneak preview

Well, it's time to inform you that the DreamMaker Overlord is launching on Kickstarter soon. 

UPDATE: Launch time is confirmed. It's 00:00h CST. For less confusion I did list some major cities here: 


The Pulse - 2010w04

LMR on the Brain
Sensing the living LMR community since 2008w43.

Happy Birthday

All over again