Let's Make Robots!


Out of the shadows, into the unknown & some questions.

Because I couldn't find an introduction section anywhere and because this is my first post (yes I was that lurker) I'll take the liberty to introduce myself.

I'm a Dutchman, 39 years old and living in the northern part of the Netherlands. I've been fascinated by robotics since my early childhood, but I never got further than buying some toy robot. My nick, for those who wonders, is from a tag on the chest of the eighties Magnatron robot I got as a kid. Since it's written in large letters it has to be something important, but you can call me Paul as well.

Picaxe problem

Okay so, I did this

And then I wanted to add IR control so i did thishttp://www.picaxe.com/docs/axe040.pdf

pushes other bots out of the arena
Using a
Hi everybody, as some people allready know i am new to LMR and robots all together, meaning this is my first robot. It was originally going to be a holiday project … Read more


So i did everything as on this guide


But it's not working, I think the code is wrong? Can you help me ^^

I use picaxe 28x1

Thank you <3

Juice Box Robot Plan, Needs review

***UPDATE MARCH 11: After reading the comments here I have made a couple of changes to my plans. I have replaced the PICAXE 18 with the PICAXE 28 and appropriate board. I have switched to 3 AAA cells as a power source and I have changed to servos to power the "arms". When I wrote the original post used the word "arms" as a placeholder, but while I always intended to have actuation it was never actually going to be a set of arms.

Infrared diodes and detectors make things fun and magical. We are use to touching or flipping a switch to turn on lights. A simple transistor circuit with an … Read more
Navigates via Infrared, and uses basic obstacle avoidance.
Using a
The video shows the robot in operation, notice that if it hits an obstacle that's just out of view and falls over onto it's back it actually turns itself off! This … Read more
Obstacles avoidance via infrared sensor
Using a
Hello, Greetings from Hong Kong. This is my first Arduino project. I have worked with the handyboard and NXT few years ago. The Arduino seems popular and easy to … Read more

Infrared sensor distance

Hi, I'm doing my final proyect and I'm having problems figuring out the infrared emitter. The problem is that the sensor has to have 10 meters range sensitivity. So the beam has to reach the object and come back. That's 20 meters. I'm doing the oscilation with a 555 in astable mode, to provide me 10KHz to 40Khz.

I've already tried the circuit with a IR Led I had, but the range is less than 10 meters.

Any clues about what can I do?

infrared sensors

I've got two sets of phototransistors and infrared emitters put together to make two IR distance sensors. They are both connected in the same way, both powered by my Arduino Uno, both with the same resistor, etc. But when I check the values I'm getting from them, one of them ranges from about 980 - 1010, with the higher value closest to the sensor. The other, however, goes from about 350 - 570, with the higher value the furthest from the sensor.

Remote Control robot controlled with InfraRed Remote.
Using a
*Note: Fritzing Schematic, and Arduino Sketch attached as Zip.*  This is a 2 motor robot controlled with an Infrared remote control. Arduino needs the IR Library … Read more

Making a fire sensor (question)

With a bit of circuitry can this IR phototransistor replace the following sensor? 

IR phototransistor:http://arduino-direct.com/sunshop/index.php?l=product_detail&p=209


I plan to interface it with an Arduino

Infrared Receiver

I've found heaps of places that sell IR emitter LEDs, like these ones: http://littlebirdelectronics.com/products/infrared-led-950nm-1pcs

But I can't seem to find any IR receiver LEDs, like the black ones used by many in their distance or motion sensors.

Can anyone point me to a place selling them, preferably in Australia?

Drive around via infrared
Using a
Because all robot kits cost enormous amounts of money I started to develop cheap and small robot – Kobold. Small because smaller components are cheaper, sensors … Read more

Our first 'robot' circuit: What is this Component?

We've been working on a lot of basic circuits, just trying to understand basic electronics.  Almost all of our components are salvaged from old electronics, so it has been slow going, but we are learning a lot!

IR phototansistors, sensitivity and RC time constant

Some time ago I had a great idea: I'm going to make two robots. One will be an obstacle avoider and its job will be just wander around with its big head. The other bot will then try to catch it and hit the head with a hammer. Tracking would be done with infrared leds and phototransistors. For the time being I've pretty much completed the first part and posted Head. Head already has infrared leds on its head so next thing would be building an infrared tracker.

Control your TV, DVD, Stereo, DVR, Cable box, Mac, Xbox, or any other IR device with the Web Clicker! The Web Clicker is a web server & IR transceiver.  You … Read more
I've been working on a home automation project for a while - Jon Williams' Spin Zone column on Sony's IR control format (pdf) got me started on IR control. It's … Read more
Patrols desktop environments, has a habit of shoving things off the edges...
Using a
This is Sebastian (A.K.A. "Sebbie"), a little palm-sized robot I built as a present for my partner since I figured it was about time I built something for her =) Read more

Infrared Proximity Sensor

I have a Infrared Proximity Sensor. Is there a way to debug the distance so I know how far I want it to detect something. I always see people's codes have 400 and 700 and I'm like where did they get those?

navigate around, make sounds, communicate with other 'bots, flash lights
Using a

Building a Universal RF Remote - Questions

More Recent UPDATE: the competed remote can be found here. Thanks to fritsl and rik for their respective helpfulness.

UPDATE: Attached (and blurrily pictured below) is my schematic that i think will work for this remote. Yes I drew it in paint, Yes it took too long:

*The "To Breadboard" leads are included so that the remote may also serve as a portable power supply.




IR Homing Beacon?

I'm looking to build an Beacon, IR or otherwise, that a robot can see and simply drive to. Pretty much like a docking station for the robot to be recharged or a robot that follows you. (unless that's something different...)

I did a few searches, but I've only come up with robots that use a beacon and not how to build the circuit and write the code.

Any help? 


Edit: 8.31.09


I don't know if this helps, but I'm pretty much looking to build what CtC did here: http://letsmakerobots.com/node/6499

Sleeker and with twice the firepower, SplatBot Mk II has some obvious improvements over the original. Noticably the water bottles and pumps are on the chassis … Read more



The goal is to allow 2 PICAXE chips to speak with each other via IR.

What receiver and transmitter have you all had success with. Where can I purchase? (links?)

Thanks all.

Navigate around via Infrared Rangers
Using a
1-1-09 Roger has been working like this for a while, but I never went around to make a video of it. Here it is. I added some white LED's as head lamps and that is … Read more

Help with IR Sensor LED020 (UPDATED)

Attached are photos of my circuit on a breadboard.



I posted a video. Ignore the TV in the background. When the universal remote sends a signal it is decoded by the PICAXE (not done manually I found a setting that the sensor can read and decode itself). A LED flashes to show a signal was read. It then shows the number of the code that was sent in the debug window. In a few days I will delete this post and add a turorial. Then its off to making my robot WOOHOO.

I am new to Robot. Compatiblity Question???

1. Which kind of motors are compatible with PICAXE? I've read in a book that PICAXE doesn't compatible with DC motors , but Servo motors. There are many kinds of servo motors and how to choose a correct one?

2. Which kind of infrared sensors are compatible with PICAXE?


New line sensor

I had some problems with the 36 KHz detector when trying to read it from the picaxe, so I have switched to using 4 infrared photodiodes in a feedback setup with two LM358 dual opamp packages as shown in the following image (for one photodiode only):


This gives an analog reading and I will use this for linear interpolation between the sensors to determine where the line is relative to the robot center.