Let's Make Robots!

Developing a small, arduino-like IoT product for monitoring and tracking

Hey guys!

Long story short, we're currently developing this small, water resistant IoT product which can be used for monitoring and tracking different things. The HW would be top-quality and the SW would let you come up with all kinds of neat uses for it. 

BoB from toy to tool

i think its time to take my BoB from a toy to a tool. and i would like ideas from you wonderful folk at LMR.

what improvements would you all make to make BoB more classroom friendly?

what ideas do you have to help in the aid of manufacturing?


my basic guidlines are:

4xAA powered (most likely ni-cad or nimh)

MG90 servos (metal gears and kids seem to sound likea  good idea)

Arduino for a brain (not sure what board)

so please throw your ideas in to the pot and ill try and incorporate them into the design

i'm new in this world i need some tips to follow

hi there everyone :)
i want to join the robots community but i have no idea about robots at all
i'm a .NET programmer c# , c...
i hope you give me some tips to follow in order to make a robot at least a beginners robot
and thank you so much  :)

chopsticks spider robot

hello everybody,

my graduation project is the chopsticks spider robot and i have a red back spider robot controller and its need a PCB but i don't have any idea about PCBs anyone can help me because we have 28 servos with 7 V  input battery and 4 IR sensors...

Thanks in advance..

serial between two picaxe

am having a strange issue  getting the 28x2 to communicate  with a 14m2

the 28x2 Tx code here http://pastebin.com/RtDvA4Sk and the 14m2 Rx code here http://pastebin.com/54KeXDaf

now the 28 Tx works as expected but the 14m2 Rx is not, it appears to go to the subroutine as it shows its recieved the data but in the terminal window no values are displaced. any and all ideas welcomed

Servo problems

I recently bought 4 Goteck micro metal gear servos with the intention of using them to move some joints in my 3d printed robot. I decided to test them onviously and ran some simple code on my Arduino (basicly cantering the servo, moving it to the left and then right). I had run this code before with some other servos which worked fine but these ones seemed to act weirdly. Instead of jumping straight to the right position they flapped around a bit before stopping at the right place.

Raspberry Pi Home Automation

I have begun work on a home (or rather room) automation system using a Raspberrry Pi as its hub. I am aiming for 3 primary functions:

     1. accept commands for interface device (ex: recieve instructions to turn lights on and off and do so using GPIO and servo)

     2. accept requests for sensor data (ex: recieve a request for temp. sensor data(GPIO) and respond by relaying data)

     3. collect and transmit large collections of data to be interpreted by interface device (ex: sleep datalogging)


Movable head without pulling wires

I'm working on a small form factor turret with a movable head.  The design has a camera (w/ raspberry pi) on a spherical mount that can rotate altitude and azimuth directions.  Unfortunately, since its a turret, it must be able to twist infinitely without getting its wires tangled.  Any ideas?  I've been thinking about a laser based system, but I seriously doubt that that is going to be able to transfer enough data to stream video.  Anyone have a simple suggestion that hopefully keeps everything hard-wired?  

T'Rex Controller Oops (Possibly Fixable)

Hello All,

I recently purchased a T'Rex Controller from Sparkfun that I think I probably blew a FET or two. I forgot to turn of the power while I was detaching the controller from my T'Rex Tank.  I'm looking to see if I just need to buy a new controller or if I can repair the one I have. So here's the symptoms:

How many sensor is needed for a line follower?

Line followers use 2-8 reflectance sesnsors for detecting the line.


This product has swift movement and turns, it uses 5 sensors 3 in middle and 2 on sides, but does the middle one is neccessary in any way? Or does it is just consuming one extra ADC pin?

I am looking for a perfect sensor array for line following robot.

LMR morès and web etiquette

tl:dr-If you violate our sense of order with (commercial) rudeness, you earn our rudeness in return.  Not saying it's right or wrong-just what to expect.

Fiberglass/Plywood panels

This might be in the wrong forum, if so, I apologize.

I'm doing a major re-design of RT, and trying to figure out a way of making more professional looking panels for the outside.

Mainly, the current method of laser-cut plywood shows off the grain after painting.  I want to get rid of that.  I've got a few options.

1 - Laser cut acrylic (expensive)

2 - CNC routed PVC sheet (moderately priced, will have to outsource to a friend)

Reverse commands

My problem is regarding the following link:

For movement, FRITSL use the following code:

low s.8
high s.9

high s.8
high s.9

low s.9

My results are:

How to connect the AERS-Sensor?

Hi guys! I am a new LMR-member and I will soon build my first robot. I have already ordered all parts. The problem is that "Sharp Analogue InfraRed Range Finding System (AERS-sensor)"  was delivered without cables. It is not described in the manual how I can do that or which cables I need. I am very greatful. if someone could describe to me how I can connect the cables to the sensor.

Help with 3D printers

Hello Guys,
I have to make a project for college and I am thinking to build a 3D printer in that project. I am absolutely new to this field and all I know about this field is how the printer works. I did some research and I found this printer. It will cost about Rs. 22,000 (or $350). As I said, I am absolutely new to this field so I need help.

Hall effect activity on a nema 17 stepper?

I am trying to figure out a way to trigger a switching signal using a bipolar nema 17 stepper motor,  without altering the wiring.  An example would be to turn on/off an LED when change in speed or direction of the nema 17.  Without attaching anything into the wiring or the core/shaft. 

GSM/GPRS module and arduino


I've just bought a gsm/gprs module named GTM900b and 

and arduino UNO and I was searching about I/O pins but

unfortunately I have a big problem with pin names ...

can anyone help me how to connect it to the arduino and get it to work ?

Stock Up Electronic Parts and Components

As the golden week of National Day is coming, both the suppliers and shipping agency are busy with preparing for the 7-day holiday now. To avoid the package delay and stockout status after the holiday, let's start to stock up with 18% discount now.

Check the deals here: http://www.icstation.com/newsletter/eMarketing/Stock_Up_0923.html

New Univeristy Project

Hi Guys,

I'm totally new here but wanted to ask some advice, we have been tasked to create a robot to carry a coffee cup over a certain distance without using power! Well electric or wind up? What can we do?



Questions on RF links and VirtualWire

Hi guys 

First of all I want to say this threat have nothing to do with robotics. Instead its about using some Arduinos to make a weather station. I've seen some of you are using RF links and VirtualWire in your projects so I hope you can help me anyway! :-)