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?

HIRING PIC programmer (Assembly and C)


Keypad and LCD Interfacing using assembly.


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. 


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 .

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.

L293D overheating, can't figure out why?


I am building the 'start here' robot. It's the first time I've ever built a robot and the first time I've ever done something like this at all, so bear with me as my terminology is possibly all wrong.


I've attached a picture of my set up


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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':