Let's Make Robots!


Allows your robot to see and track nearby objects
The purpose of this cheap, easy to make eye is to allow your robot to track movement of nearby objects (within 200mm). After much experimentation and various … Read more

problem with IR remote upgrade

i was trying to see if i could make sounds, LDR-test and ir remote test.

upgrade stuff here: http://www.rev-ed.co.uk/docs/axe040.pdf

but there is a syntax error :(



please help!

Programming help, sharp IR mounted on servo


I am trying to control my bot using a sharp IR sensor mounted on hitec servo with arduino mega. The pseudocode i have so far is as follows:

1. Set servo at 90deg and read IR sensor value
2. If val > 200, then stop the bot for a second
  a. Turn servo 0 deg completely and read ir val
  b. if val < 200 then turn bot left
  c. else turn servo 180 deg and read ir val
  d. if val < 200 then turn bot right
  e. else if cant turn right or left, reverse a bit and then turn the bot 180 degree and go straight.

sits in one spot and does nothing for the moment
Using a
Basically this tank was gutted and is being rebuilt with sensors and a new brain. I've posted info on this tank and how cheap it was to aquire, so now this is going … Read more

Plastic thats invisible to IR light?

There are lots of great and interesting little robots on this site and on the web, but so many of them use the sharp IR detectors that they all start to look the same. I wanted to do something different and a bit more aesthetically nice, so I thought what if I could get some plastic thats transparent to IR. Then I could hide the IR sensors behind them and completely change the look.

bluetooth com and processing language rig

These are the source files related to the setup I mentioned in CTC's post about wireless serial com.


Reposting info on the setup just for ref.

Alrighty, ctc, got the rig working. The setup is the following:

<ir beacon> transmitting byte sequence from 1-9

<relay station> picaxe 8m with ir receiver showing correct data in the debug window.

Transmitting the byte sequence received from ir beacon via bt to my desktop running the processing code.

mini ir beacon

So this is the mini ir beacon I've had mulling around but never got around to building one....or finally built it. I'll post the current code for this in a bit.

The circuit is pretty basic in that it just uses a picaxe, an ir emitter, led, some resistors and a npn transistor. Ialso wanted to keep it small(hence the mini) so decided to use some lr44 batteries to get around 4.5v out. The battery holder was fashioned out of some 18ga colid copper wire which does a great job of holding things together.

 The setup

This is a walkthrough on how to make a simple IR controller. It is relatively cheap and easy to make. Programming is simple since the picaxe basic already has … Read more

Help with IR sensors ~ TIL 38 & 81

I'm trying to set up a IR proximity sensor and these are the only ones available in my area. I have no datasheets or circuit diagrams.

Both are leds: TIL38 as transmitter; TIL81 as receiver 

How should  I connect them to my basic stamp?

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.

In an earlier tutorial on IR object detection sensors I mentioned that they could be used for object tracking. Now I show you how and my progress so far. I've also … Read more
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
Navigate around via IR
Using a
This is my first robot. The photo shows the way it looks for now, but it's a just 'prototype' yet and it will evolve ;) It has been inspired by fritsl's 'how to … Read more
Detects objects at close range. Can be used for object tracking.
Now with video of the sensor being used as a Mintvelt inspired object tracker! This sensor is a short range obstacle detector with no dead zone. It has a reasonably … Read more
Maps enviroment, explores with arm, falls over.
Using a
Sun 7th Dec 2008 Had a few setbacks with the old NiMh battery pack dying and the new LiPo battery packs not fitting where I hoped. Compare the old photo to the new … Read more
Web-controllable roaming camera; autonomous object tracking / obstacle avoidance with IR
Using a
 Latest Update: New 4WD base with omni wheels- see new 'QwerkRover' project! My first robot. I added a couple of features to the "Qwerkbot+" recipe- a sharp IR … 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 have got the sonar sensor working and scanning and added this to the data sent to the pc.  I have also written a very basic obstacle avoidance program which … Read more
navigate around with IR and avoid stuff
Using a
This is igor, my first robot.  His brains are a Make controller, a SAM7-based microcontroller which I gotta say was NOT the cheapest but for the most part is a joy … Read more

IR Versus Ultrasonic rangefinder on grass.

Hi, I'm pretty much new to robotic, even though I've worked with kit like fischertechnik and Lego NXT.

I know the base of it, and i'm good with electronics.


but here it is i want to build plane that coud fly by itself using rangefinder (Ir or ultrasonic) to keep a distance from the ground, but i've read that IR sensor aren't good outside and that ultrasonic doesn't work good on absorbant material (Grass).

Since it's a plane I also have to consider weight in my choice.

Wich sensor would be the best for this task ?

Navigate around objects via infrared
Using a
After far to much time spent gathering parts, I put together my bot. I skipped using a servo for the moment so it turns on its tracks to measure distance left and … Read more

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.

36 KHz modulated infrared light detector

I have started working on a new robot that is mainly based on LEGO MINDSTORMS NXT. This robot is aimed at participating in DTU robocup 2008 but time will tell if it will be finished in time. Anyway in robocup the robot must at least be good at following a black line and preferably it should be able to accomplish other of the tasks at hand as well, and this is just not feasible using the standard LEGO sensors and the very limited number of these it can use at one time.

Looking at an IR-transmitter, but have no clue weather it is on or off? Turn on your camera, video or still, as long as it is digital. This blue spot does not show … Read more