Let's Make Robots!

COSMA - Update 1

In the meantime I named the robot astronaut Cosma, a maiden name, ancient Greek for Cosmos. Below you'll find a more specific design study. I think I will 3-D print the main body and the head. I've furthermore tested a FSR (force sensing resistor) as a kind of pain receptor and the ArduEye.

R2D2 Third Leg

Started to work on the third leg today. Inside the body four aluminium pipes guide the platform where the third leg will be attached to. The platform needs more stability going up and down, so extra gliding holes will be placed somewhat higher around each pipe in order to make sure the platform stays horizontal when moved.

Another Pro Mini breakout board.

When Bajdi wrote his blog, http://letsmakerobots.com/node/40026 , about his undershield for the Arduino Pro Mini clones I was very interested and excited. This was because over the last few months I have purchased a few (20) of these Pro Mini clones myself. I was elated to see that there might be an easy interface board for my future projects.

A simple HTTP communication protocol between wifi and Arduino

How to let the sensed data (e.g., temperature) on the Arduino send to the remote server? 

The following code is used to realize this function.

void setup()

{

 Serial.begin(115200);

}

void loop()

{

   int n=analogRead(A0);

   float vol=n*(5.0/1023*100);

   upload_sensor(vol);

   delay(5000);

}

 

void upload_sensor(float vol) 

     // send the HTTP PUT request: 

     char buf[200];

Sub $4 USD Arduino Nano on eBay.

I am always looking for cheap and small micro controllers. Since I moved from 8051 and HC11 based boards three or so years ago, I have been using the Atmel based Arduinos for the most part.

For the past two years, I have used mostly the Mini Pro's in most projects. I like them due to the small size and the fact they are less than $3 USD on eBay. I would love to use Nano more, but due to cost and issues I have not.  Now, I have ordered a few (5 or 6) Nanos from eBay, and have had mixed results with them in the past.

The problems have been:

Do.. Document your Robot!

It is about a year ago I made a robot called "Skiwalker".

It's parts are used for other robots, and I would have forgotten all about it, if not every now and then when I logged in, someone wrote to me; "Hey, that is a nice walkthrough, cool, helped me, inspired me" etc..

That is so NICE! It often makes my day, to get that kind of feedback without warning for a long forgotten thing I did.

And all I did at the time was to remember to film / take pictures.

Yet another L298 based motor controller

Hi all,

motor controller

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 This came out as a sub project related to my DIY CNC machine "the Beast"  because the outputs of the Arduino would not suffice to control the motors. So I chose to use I2C for this purpose and designed my own little guy.

Ignoble Idiocy

"Those who cannot remember the past are condemned to repeat it." - George Santayana

mistake_0.gif 

Nobody's perfect, least of all me.  Here I intend to record some of my roboting mistakes for my own good.  Perhaps you can learn from my errors, or even contribute your own.

Latest Update: 2010-02-04

RepRap Conversion for a set of Probotix SideStep Stepper Motor Drivers

Abstract

An Arduino or similar microcontroller shall be used to create a RepRap-style front-end for the HobbyCNC EZ Driver board or similar DB-25 controlled stepper driver.  This front-end microcontroller application would allow RepRap applications to control a number of powerful CNC machines.

Introduction

Binary Clock Parts

Hey guys, I was thinking of making a binary clock. I don't want this to end up being the typical Dent work- I want this to be good looking and long lasting. It's going to be hung up on one of our walls, so I must be very precise.

Right now, I'm trying to find the right parts. I'll be spending my parent's money after all, so I want this to stay cheap (but still look good!) and I wanna get all the right parts the first time around. 

My Boss

Yup, this is who I work for and why I love my job. --And because you guys are electronic geeks, the actual unit specs were 9000v, 400mA output.

What to do with the big motor driver?

2.9.2010, past midnight

Lots of Ideas have been flying trough my mind since I got the motor driver ready.

(http://letsmakerobots.com/node/22363)

I am now thinking of making something like this, only a bit bigger.

Canadian National Robotic Games 2010

Hello all,

I had a great time in Toronto for this years Robot games.  I managed to get 2nd place in the masters mini sumo competition with Blaster shark.  I made a new robot called Driller shark which I will post shortly in the robot section.  It didn't do that well, but all in all I had fun.  Here are the pictures.

Ordinary lunch kit?

Rover transforming rocket

An idea I had today how a rocket could be transformed into a planetary rover:

 

Rocket soars into the sky


Rocket engine drops at burn-out

 

Parachute deploys at peak altitude

 

H-Bridge Variation --Full Disconnect using Relay or Extra Transistors

This is a continuation or update of the earlier page on making an H-Bridge for motor control without allowing a full short of the power supply under certain conditions as with other H-Bridge drawings I see all over the web.

The original 4-transistor design was bread-boarded and tests showed it worked as planned.

 

The following designs have not been bread-boarded (as yet), but I believe they should also work as designed. (See truth table on second drawing.)