Let's Make Robots!

RIP Lumni!

Lutz, LMR name: Lumni is ..dead!

Lumni was LMR member for 4 years and 15 weeks..

Use a mosfet instead of high amp rocker.

I tried to find a larger current rocker switch locally and can't seem to locate anything.  I thought maybe I could use an N channel mosfet controlled by a digital pin (d4) on the arduino to power the 30amps the motor controller needs for the 2 motors.  An additional benefit (I think).  Is that the arduino and the logic side of the motor controller will be powered before the motor voltage/power is turned on.  

flying autonomous drones

What type of software would you recommed for a flying robot arduino,beagleboard,rasberry pi,etc.

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.


NASA Space Apps Global Challenge Winners

Hello LMRians! Hope the robot-making has been going awesome!  

The recent Earthquake has saddened many lives in Nepal. But, we have something to smile about for a while. I along with two of my friends had taken part in the NASA Space Apps Challenge. And I can't believe it, but we won BIG. We were elected for the Most Inspirational Project Award. 

Fire sensing robot

I want to make a fire fighting robot

Which sensor can sense fire?

Free PROFESSIONAL Robotics Conference in the midwest, July 2-3

Once again, I want to bring everyone's attention to my "work baby" at my new job (I developed the website for the Conference on Automated and Robotic Construction of Infrastructure.)  This takes place on July 2-3 in Ames, Iowa and is completely 100% free to attend.  We even provide lunch on the first day.

It may sound kind of dry at first, but some of the topics may be interesting even to those of us not interested in using robots to build roads and bridges:

ICStation 2nd Anniversary Celebration: $0.99 Limited Sale, Site Wide Sale Plus Coupon

www.ICStation.com welcomes the 2nd anniversary now.

To thanks to your kindly support, we had offered $0.99 Limited Sale for the first round.

Please have a check and hurry up to enjoy the offer.

Deals: http://www.icstation.com/newsletter/eMarketing/ics_0514.html

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?

My Code

Hi all,


I've got my robot working and I'm quite pleased with it, especially as I'm new to programming. I haven't written the code myself. I've downloaded various bits and edited it quite heavily. Non the less, I'd appreciate an experienced eye looking over it and pointing out any mistakes, or where I could be more efficient, etc. Which I imagine is numerous areas.


osccon bit, please check if i'm right

I want to set the frequency of my PIC16F1828. 

the chip: http://ww1.microchip.com/downloads/en/DeviceDoc/41419A.pdf

the osccon setup is page 60 to 71.

I want to set it to 8MHz, so with looking at the datasheet I think I need to set the osccon= 01110011 

I'm not sure if I'm right so could someone please verify this?


I also have to enable rollover 0.1ms or something around that for my Timer0 function, but I can't find the value that I need to set tmr0 to.



RAMPS 1.4 as a robot driver/controller

RAMPS and arduino mega have lowered costs much thanks to RepRap movement. How much it would be useful to use it to drive a robot?

4 drivers could drive the base wheels and the last an ultrasonic sensor. Endstop headers could be used to drive servos? Heated bed and extruder heater could drive instead high power peripherics like a big lamp or pump... Or just keep doing what it does well and leave behind 3d printed objects!

controlling servos

How do you control a servo with a microcontroller in Flowcode 5

I was just going to use a pwm macro but according to my teacher I need to bring the speed down to a period of 20ms which can't be done. Now it wouldn't be the first time he's wrong.

So there is a PWM component macro in flowcode 5 and a servo component macro, yet he still says none work.

Does anyone know for sure if it works and if it doesn't, how can I do it?

Arduino Problems

Edit #1:Just found that instead of the regular chip used for usb to serial conversion on standard arduino boards, the clones have some sort of cheap chinese converter IC.I did some  finding and found out that mine was CH340.

Last month I bought an arduino nano clone for ebay for around 3$ but when the package came in my hands, I was shocked to see the import taxes - 16$, gosh! you can't be joking but yeah,that's what i had to pay to actually get hold of the package. 

Arduino connecting grounds

Hi all,

I have a question here, which is probably simple to some of you, but I'm going to ask it anyway.

When using multiple servos from an Arduino, I use an alternative power, to the Arduino's on board power, however Arduino and servo power all derives from the same battery. I also connect the grounds, from the servos to a ground on the Arduino. I assume this to be correct, as it works and all the information I have viewed supports that.

Arduino motor schield

I bought a new l293d motor shield when I connect it uno board the led of both board are turn off and the pc can't find com3 port.

Is it damaged one?

Recommendations for power source

Hi all,

It's my first post here so I'm hoping I'm doing this right. I'm currently building a robot on the oh-so-popular Dagu Rover 5 platform (4WD). I don't have much mounted right now. One Arduino Uno, with an OSEPP motor shield and a servo on which I mounted a PING))) sensor.  

For the moment, I'd just like to get this guy running autonomously to get the experience of an end-to-end project. I'm probably not even going to bother with the encoders just yet. 

RC car controller

Hi, for a project for school I'm making an RC car,

for the controller I use 2 PS1 joysticks, 1 for the movement and 1 for the camera.

the camera movement is easy but I can't figure out to get the info of 1 joystick to controll the 2 motors.

I'm using flowcode 5.

Can someone help me with this?