Let's Make Robots!

Source code for Srf05 and picaxe 28x1

is this the correct way to adapt the source code of fritsl's "how to make yfr" for a srf05 sensor? ... i suppose not -_- .. T_T .. can you help me fritsl? :p 

 

 

 

hacking the digital Sharp IR sensor

Check out this link, Ladyada bought a digital IR sensor by accident, and found a way to turn it into a analog one. Clever!

And an interesting aspect is that the D version is often cheaper than the A versions.

http://www.ladyada.net/rant/2008/10/quick-tip-analog-signal-from-a-digital-distance-sensor/

 

pivots

 Hi all,

You probably read my blog and know I am working on a design for robot legs inspired by the legs of Theo Jansen's Strandbeest.

Below is a picture of a plywood prototype on its way to become version 6.

PID Speed Control

Hello All,

I am new to the site and would like some help with DC motor speed loop control.

A basic proportional  control loop actually works.  The problem I am having is that I need my main power supply to vairy, yet keep the motor speed constant.  The project deals with a helicopter where I need to keep constant speed independent of the battery voltage slowy dropping off.

I have designed and used PID loops for DC gear motor position control, but I am having trouble using similar equations in this application that required speed control and not position control.

Building strapping

Im not sure what it's called, CTC can you enlighten me? But it's cheap and easy to work with. I've used it on Retro bot for the extra battery holder http://letsmakerobots.com/node/8004 You should be able to get it from you local building supplies store. Easy to bend, and cut it with tin snips.

strap.jpgstrap2.jpgretrostrap.jpg 

Arduino vs. Picaxe syntax

The idea of this thread is to provide a place for asking question about the SYNTAX of the Arduino and Picaxe languages. I invite everybody to do the same and I'll be happy to help with Arduino syntax. Perhaps we can create a basic "dictionary" between the two and hopefully this will help the users of the respective platforms to SHARE code.

Perhaps we're not so different after all :)

 

Here is something to get us started:

 

MTR - A planetary surface exploration rover

My PhD work, from concept to implementation ;)

PWM and registers

Hello,

some time ago i had opened a forum post about PWM on arduino. RobotFreak gave me a piece of code that made my remote work:

#define pwmPin 11

void setup()  {
 
  // toggle on compare, clk/1
  TCCR2A = _BV(WGM21) | _BV(COM2A0);
  TCCR2B = _BV(CS20);
  // 36kHz carrier/timer
  OCR2A = (F_CPU/(IR_CLOCK_RATE*2L)-1);
  pinMode(pwmPin, OUTPUT);
  
}

Anyone with a CNC mill taking paying/exchange jobs?

I'm looking around to see if anyone's got a 3-axis CNC mill they'd concider doing a job on? I'm trying to address the lack of parts for making the current RepRap "Mendel".

 I've been using silicone moulds and PU fast-casts for a couple of years, so if I can get someone to make a single version of each part on a mill (without undercuts/crossways holes) I can make multi-part moulds to cast replicas.

Oh_Oh Robots

 

Hello Everyone. This is a news flash from Mexico. David Cuartielles is now  here spending the summer in Mexico, given workshops about creating small robots. The Oh_Oh robot was introduced at the Faro de Oriente. This small bot is
commissioned by the Spaniard Cultural Centre and The Faro de Oriente. This bot is an open source  project created by Cuartielles and Yang from the Physical Prototyping Laboratory from the University of Malmo, Sweden.

Here you can see a few pictures of the bots. Cool, aren´t they?

Wireless Control

im looking to control my picaxe robot wirelessly by either my computer or remote control..
what is the cheapest method and how would i go about doing it?
thanks muchly

Cute Lego Felt Tip Printer

A friend forwarded this to me. Cool application of Lego to make a printer. The video author's comment on YouTube:

"Lego felt tip 110" printer connected to an Apple Mac.  This is not a kit you can buy and does not use MindStorms. I designed/built/coded it all from scratch including analog motor electronics, sensors and printer driver, the USB interface uses a "wiring" board.

Once again, this is not my work. I'm just posting something I found cool.

 

 

Work towards computer controlled robotic arm

Hi guys,

I've begun work towards a computer controller robotic arm. I've been documenting my work in short and quick tutorials for posterity and for other people who needs help.

I'm using a PIC16F690 using mikroC compiler and pickit 2 programmer.

Ive posted up some work here on my blog: http://activerobots.wordpress.com/

I've begun documenting how to communicate serially from PIC to PC. I've embedded a short vid of the results.