Let's Make Robots!


help needed with picaxe-08m code

g'day all
i have a problem with programming i was hoping somebody could help me with.
i have the Picaxe 08m servo controler board http://www.rev-ed.co.uk/docs/axe024.pdf
and the Picaxe srf05 www.rev-ed.co.uk/docs/SRF005.pdf

SolderJunkie Construction


Hi, I have started work on project named SolderJunkie. I want it to be a motorized solder fume extractor. He is going to use a Picaxe 28x1 as his brain, DAGU IR compound eye, few servos and CPU cooler for parts. I only started construction of mechanics, so far. Here is his first pic:


Automated Light Switch - Laziness Prevails!

The Video explains all.

This is my automated light switch, built in a little under 2 hours. Just one application that a servo can be used for.

The servo is just mounted on some hastily cut masonite, the triangular brackets are just glued to the main board with PVA, and everything else is held together with double sided foam tape.





Walks around autonomous
Using a
Hi i'm from Romania and i am 17  year old.I am in robotics from age of 13 and i will show you my scrap built 4 legs walker.I have started with two old servos and a … Read more
“The Crawler” is my first indoor robot with a range sensor. In hindsight I can see that I probably should have gone with motors and wheels, but I wanted to … Read more

How do I control 18 digital servos with a 28x1?

How do I control 18 digital servos with a Picaxe 28x1?

I have the microcontroller board with the 28x1 mounted and I've tried building the "start here" robo. 

 I now would like to know how to be able to control 18 digital servos since I am building a Hexapod :)

All I really need to know is what extensionboard I need.

Thanks in advance :) Please let me know if you need more info.

Radio Controlled Servo?

I am completely new to robot building, and electronics in general.  I am currently working on a homemade airsoft claymore.  It is designed to be toggled via a wireless remote control. The issue is that I don't know much about wiring remote controlled systems. I've built a few remote controlled cars, but they were from kits, so I really didn't understand the electronic aspects: I just assembled them by following the instructions. Here is my problem with my current project:

Walks forward and backward, turns in place, avoids obstacles.
Using a
This is a simple three-servo hexapod robot using the Pololu Micro Maestro as a controller.  The Micro Maestro allows allows me to sequence gaits and integrate … Read more

The most useless machine ever

This is a "most useless machine" i made. I used a instructable but it was a comment by "compukidmike" that was the schematic i used. 

here is compukidmike's schematic picture thing  http://www.instructables.com/files/deriv/FCQ/XPAC/G43EFYKB/FCQXPACG43EFYKB.SMALL.jpg 

Introducing the PolyMorph finger ...... or toe if you dare to use as locomotion The idea is Inspired from Anthropomorpic finger PolyMorph is a Flexible plastic … Read more
Last weekend we had a nice weather, and I made a Light in the garden, and decided to make a photo of it with my robot next to … Read more

Can i control a servo with a 555 timer?


I would like to sweep a servo back and forth, and theres no point on using the arduino for this, and thats all i have at the moment, so if i supply 0v to the yellow wire on the servo(signal) and then supply it with 5v, then 0, then 5v again.... would it sweep the servo? or does it have to be modulated?



My first robot, A 4 legged walker, Still a long way to go :D

Hello and greetings from Norway.

Since the winter is creeping upon this very cold land that I live in, and the sun is hiding just about all the day, its time to start some indoor project.

I have always been fascinated by DIY robots and have had many "Brilliant" (horrible stupid) ideas for designing and building them.

But finally i have started a robot project for real. wohoo!


How to reduce servo noise?

So it has come to my attention that like motors, servos too need capacitors over the power and signal lines. Well my question is exactly what value capacitor and on what servo pin. I looked online and could not exactly find it, maybe you have a link. I dont know if it is specific to what servo you have but here is the link to mine http://www.hobbypartz.com/topromisesg9.html

SSS - Servo Suspension System

This is my first experiment with the MakerBot. I am totally thrilled with this machine!!!

SSS (servo suspension system) is designed to support standard servo motors and act as a basic suspension. It is still a work in progress and has not been tested yet.

Will update results as soon as possible (still waiting to have my lab back).

I would like to know everyone's opinion on this  :)

Practical question about servos and capacitors

I have read in many places on this site about using capacitors to reduce motor and servo noise. I am now using 0.1 uF capacitors across the leads of my motors as standard practice. I'm also using 470 uF and 0.1 uF capacitors around both sides of my voltage regulator. As yet I haven't tried applying a cap to a servo, and I have a quick question.

finding cheap RC ESC (speed controller)

I love RC ESCs. They are electronic speed controllers that you connect to a servo output on a RC receiver or a micro controller, and they give you full step free control over a big motor in both direction. Most of the ones made for RC cars work in the voltage range 6-8.4Volts, but there are several alternatives for people who plan to run up to 24 volt motors in almost constant stall at a gazzilion amps (read robot war contenders).

But I'm the eternal cheapskate, and wants the cheapest there is.. So far I've found this 

My 1st non-breadboard circuit :)

I know..a lot of you good folks could solder before you could walk and probably sleep with a soldering iron under your pillow (hope you remember to turn it off :), so here is this guy in his 30s bragging about his first circuit. Pathetic.

However soldering is a major challenge to me and actually the main reason I didn't get started with robotics years ago. It's just not easy for my unsteady hands. So I'm very happy to declare that I just finished my 1st working non-breadboard circuit. It's a motor+servo shield for my Arduino.

Servo controller using timeframes

I have four servos with the following specs:


About the size of 2 postage stamps, the Simple Servo Tester lets you test two digital or analog servos without using a transmitter or receiver, just plug in your … Read more
Roams around, avoids obstacles with ultrasound and ir
Using a
This is propably fourth or fitfh evolution version of my first finished and working robot ever built. It has Oopic-R controller as brains, 2 cont.rot. modified … Read more

Sensing servo feedback


I'm new to this forum, robotics, electronics and microcontrollers, however I have been programming a long time and I'm currently studying computer science.

I recently bought an Arduino board with the purpose of making robots for experimenting with my special interest: AI.

I wish to build a walking robot and experiment with varios ways of giving it a nervous system. So I will need to find a way to get feedback directly from the servos, thereby being able to read the amount of stress (load) they experience at a given time.

What digital servo uses a Atmel 168 internally?

Several months ago I read a post on LMR about a digital servo that was controlled by a Atmel 168. Now when I say controlled, I don't mean hooking a servo to a microcontroller the normal way, I mean the motor controller board inside the servo had a Amtel 168 chip on it.

Just to clarify - I'm not trying to figure out how to control a servo with a microcontroller (like an arduino). I'm looking for a servo that uses an atmel chip on the controller board inside the servo.

Makes your servo moves in a smooth way
                          I’ve been working on this for a while and finally I have the courage to post the results. Read more

ldr test

I made a simple test project just to see how an ldr works... i used a servo to indicate the light level read from the ldr...

The video is a bit shaky, but i think it is good enough for its purposes :P 

What to do...

17 no-longer-sterile tongue depressors, and five mini servos. This should be fun ;)


Servo Control with PICAXE-08 (NOT M)

One for TofuRobot.

 1.    The electronics:-


The Diamond on the left is the Picaxe pin, I normally use a resistor 100-200R just to protect the Micro just incase of short or plugging the servo in backwards (there are two types of people using servos, those who have plugged servos in backwards and those who are about too!).

High-End Radio Gear

My remote control car met the end of its life last week. (smashed into a wall...) So, i salvaged everything i could, and found some interesting stuff:

A Motor Controller

Transmitter/Reciever (can control 2 servos)

5 batteries, ranging from 1500 to 2000 mAh

I also had lying around:

2 radio transmitters

a second switch for the motor controller


I need:

-arduino proto shield

-lots and lots and lots of polymorph. like a shoebox full. a shoebox from someone with canoes for feet.

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.