Let's Make Robots!

How to properly secure aluminium servo horns to Towerpro servos?

Last night I finally put my Chinese bought biped together. Quite an exercise in frustration really, virtually every darn bracket had to be bend to fit. In hindsight I'd better made the brackets myself!


Anyway, the kit came with aluminium servo horns that are slightly too big for my Towerpro 996 servos. (It takes talent, I guess, to make things exactly so that the don't fit perfectly.) The result is of course that I have unacceptable play on the horn, weren't those aluminium horns suppose to be more durable and accurate than the plastic ones?

Buck/boost module for voltage, anything to boost current? charge pump circuit?

Hi There,

I was wondering how charge pump circuits and buck/boost modules work.  I have a buck/boost module i purchased on ebay, and by hooking up a multimeter to the output, I can verify that from 5V in, i can get get more than 5V out.

Does this mean that i can hook up a solar cell to the input, boost it to 30V, and power a lawnmower?  I'm guessing not because even though it is providing a higher voltage, its not boosting current.

So that leads me to wondering if there are similar devices to boost current.  Perhaps something like a step-up transformer?

Need consistent 90 degree turns. HMC5883L and Arduino Mega

I am currently working on a project for school. The idea was to create a robot that could perform pathfinding functions using A*. The path is found using a virtual grid of nodes programmed into the Arduino where "X"s are non-passable objects, "0" as the start, and "1" as the destination.

Not sure how to insert code on this forum. Someone could help me out with that as well...)


HIRING PIC programmer (Assembly and C)


Keypad and LCD Interfacing using assembly.


Does anyone recognize this thing?

Hi there everyone,

I salveged a couple of these from an old Samsung laser printer:

I suppose it's an electromagnet and it should be as easy as supplying the right voltage over both the wires to "turn it on". However I tried up to 18 volts but nothing happened. 

Anybody knows how much volts I should supply? Or is it something completely different?

Here's some more pictures:

Arduino Due shield having longer range than bluetooth

Hello guys I'm working on a project for controlling the speed of DC motor using smartphone. Right now I'm using bluetooth hc-06 but  I want to increase the range What should i use which would have longer range than the bluetooth. I'm using Arduino Due board.

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Long Range IR Proximity Sensor

Hello fellow robot enthusiasts, 


I need some help. I would like to build - from scratch - the device listed above. Though I have endeavored to find this information on the infallible database known as "the Internet," my efforts have returned to me fruitless. I ha e found many tutorials on how to build a simple IR range sensor, but these tutorials stop there, and offer no information beneficial to improving the function of the sensor. That being said, I would like to know if someone can walk me through the construction of this circuit. 


Source for Wild Thumper Motors, Parts and Top Plate

Hello, I am wondering if there is a source for the individual components used in the "Wild Thumper" 6wd chassis? I would like to acquire another top plate and possibly some of the other aluminum chassis parts. Another question that I have is about the Motors with built-in shaft encoders for the Wild Thumper-- are these available in the 75:1 gear ratio? Will they fit the Wild Thumper chassis? I don't mind if I have to make something electronically to interface them, but will they fit mechanically? Is there a source for them? Thanks John

Arduino Due and ZS-040 bluetooth module

hello I'm trying to connect ZS 040 bluetooth module with my arduino due, vcc pin is connected to 3.3v and gnd to gnd of arduino now rx and tx pins are connected to tx1 and rx1 of due. I'm using the following code

void setup() {


pinMode(13, OUTPUT);


void loop() {

  if(Serial.available() > 0){

  char inByte = Serial.read();

  switch (inByte) {

case '0':

an update on the BoB/Zowi thing

after some emails back and forth and agreement has been reached im going to change my license to allow them to produce and sell their Zumi varriant of my BoB robot and they have agreed to my requests. all is well and im happy to have this situation taken care of.

Need feedback with the code on a simple bot I'm working on.

This is the code for a basic obstacle avoiding insect bot. I borrowed some code from a book and the part about the newping library, I did it myself. I want it to go back and turn left/right and move forward on detecting an obstacle. Will the following code do that? I edited the code a bit .

Interfacing arduino and l298n to labview

hello, I'm making a project for controlling speed of dc motor using l298n with arduino and labview 2013.

Urgent Help Arduino learning


I want to learn programming and using arduino, but unfortunately I did not have any idea how and from where can I start, please can anyone guide me to the best and fastest way to learn programing, I went to the libraries but I lost between the books, hope you help me with low cost sources.

Kindest regards,


Problem with HC-SR04 distance sensors

Hi Everyone,

I have been finding that I get erratic distance measurements on my tests with the HC-SR04 sensors. I put together a circuit with 128x64 OLED SSD1306 I2C display (Really like that module, by the way) connected on a breadboard to Arduino Nano v3.

The idea behind the circuit is:

Use the NewPing library to generate a distance measurement in centimeters.

Print the distance value to the screen, and keep on repeating.

As the sensor is moved around (8V lipo battery connected to Vin and Ground) you can see the distance updated on the tiny screen.

Arduino Day 2015

Will you take part in the Arduino Day 2015 on Mar 28?

It's time to prepare the project or related material now.

ICStation has offered 20% off on the Arduino related items during this period.

Happy to enjoy it now.


Help with Brat clone

Hello my son is trying to make a lynxmotion brat clone we have bought one of these 6dof clones/servos etc off ebay, whats the cheapest and easiest way to get it walking?I have an ardiuno board, but I understand I will need a servo controller? whisch one do I buy and how do we code it?



Peter (UK)


eBay Sniper Lesson

This doesn't have much to do with robots.  Nothing at all in fact-but let's face it, about half of the forum is only tangentially related any more (3d printing, remote control cars, quadcopters, LED cubes, etc.)  This is about a lesson I learned about eBay today.  Or maybe it's about arbitrage or something else-I'll let you decide.

First timer and hopeful enthusiast

So I go to school at ITT Tech and after turning in our project I now get to mess with the remnants of what we built.  Now what I have built and will put a picture in of is a basic water sensor and arduino package.  This worked fine and the teacher liked it but I have always been worried that the LED was so dim when it turned on that we could barely see it.  The teacher said it was fine and let us go.  I on the other hand am not happy.