Let's Make Robots!

Servo

Last Update: 3-Aug-2011 : Finished assembly. Updated board photos and added few more. Meet IBS-Wormy! This is a simple bot for my baby-daughter to play with. And I … Read more
     During my week of final exams I had almost nothing to do after my half-days of school, then I had a revelation, why don't I make a robotic arm. The fact of … Read more
Walk forword,back.left,right,balance one leg, up-down 1 or 2 leg,Turn right-left,camera
Using a
Upgrade 10/9/2001 Hello again I've made some additions to the Red-Dragon in order to make a humanoid robot. Read more
Uses 3,5mm jack to transfer signals on a rotating axis.
First thing first. This is just a quick and dirty attempt to improve the 360 degree sonar idea. I have seen some of the designs at LMR with a 3,5mm jack plug and … Read more

continuos rotation?

hello everyone im making a robot, and ive accidently bought my self non-continous servos. so i was on my way to convert them yo continous rotation and reading all the how-to's it says you need to use a servo controller to set the servo to the center position before beginning, but i do not have a servo controller. please tell me if i can just do this without setting it im just making a  small r/c or autonomous robot. if i need to can i just go ahead and skip that step do everything else and then wait for my arduino and motor shield to come in and then set it to center position?

Sometimes you need to know what position a servo is currently in. Two examples are: 1. The robot has lots of legs and the power has just been turned on. Without … Read more

How to read servo angles

I am thinking to build a robot arm or similar construction which can perform pre-recorded moves.

So, my question is if there is any way to read the servo angle/position and store it in a value (lets say in the EEPROM) and later just run the program to read these values to perform the same moves than before.

Walks around using 3 micro-servo's
Using a
Hi LMR people! I'm building a little hexapod, just for fun. It uses 3 tiny 3g servo's (from ebay). all the legs are constructed using the inside of terminal blocks. … Read more

SD 20 servo driver

Hi guys, Recently I posted a post on the forum about controlling a larger amount of servos (18). A few people suggested the SD20 servo driver chip which looked awesome so I went ahead and purchased a few of these chips. I have made the board and setup my picaxe 40x2 to send out the commands via i2c however I have ran into some problems that I just can't work out. All of the servos do seem to move to the given position but they seem to lack greatly in power. Second problem is that the servo movement range is greatly decreased.

Picaxe 40X2 servo control

Hey guys,

 

I have been working on a new project over the past couple of days and I have just come to the electronics stage of the project.  What I need is control of 18 servos.  For this I purchased a 40x2 chip as I saw how many I/O it had and seemed like the way to go.  Problem is that when I plugged in my Picaxe 40X2 and attempted to control a servo, The editor advsied me that only the "B" pins could be used with the servo commands.  This means that I can only control 8 servos with this chip?

This is Flippy, he was built to win the Cross the gap challenge but I couldn't complete him in time. He is the second (and third) implementation of my third design … Read more

Anyone knows the HS-35D Micro Servo Motor?

This servo motor looks very nice and it's very small, but it costs a LOT. I think it would fit just fine in applications such as helicopters or quadcopters. 

HS-35D Micro Servo Motorhere it is: http://www.robotshop.com/ca/hitec-hs-35d-micro-servo-motor.html

walk around and avoid obsticles with 8 servos and a sharp IR (impress friends!)
Using a
this is the very begining of my quadruped it uses a picaxe 28x1 and will sponser up to two servos per leg (2dof) so far the black box is just the "control station" … Read more
UPDATE 24.April 2011: New video! :) I implemented automatic resetting of the legs positions before changing from forward/backward walking to left/right walking. … Read more

Servo time/speed and position control (using an Arduino)

Is there a way to control servo position and speed at the same time? ex: you want to build a biped but you don't want the movements to be jerky.

thanks

I have seen a number of fantastic Hexapod style robots, most using laser cut parts and very expensive servos. Chopsticks is a robot Spider made from cheap standard … Read more
Line follower, sumo and finger follower behaviours selected via a mode button.
Using a
R/C robots are fine but I like autonomous robots best. For this March Break I wanted to host a "Build You Own Robot" party for my son and his two friends. I've … Read more

Advice on building a pan/tilt robot arm

 

Hello LMR folks,

I am in need of some advice over a robot project I plan to build. I have a small amount of experience with using an Arduino, soldering and general circuit making, but I've never used motors yet.

What I plan to do is to have a "robot arm" attached to the ceiling with a camera at the end of it. The arm need to be able to rotate the camera around and depending on some conditions tilt it at different angles.

6 leged base platform, that walks around
Intro This is a 6 legged platform, that moves by walking around. You will need an RC servo controler to move the legs. Material list Plywood - The size of 2 … Read more

Question, can servos "leak" power?

Hi LMR! If you haven't seen my robot MAEP already, it has two power supplies, one for the motors and one for the Arduino. I decided to add an LED indicator to show when power is being supplied to the motors (which are servos). The LED is just connected in series with a 1k resistor to the power lines from the motor power supply, a 4.8V NiCad battery. As you expect, the LED is off when motor power is off and on when the motor power is on. But when just the Arduino is on and not the motors, the LED is lit dimly, and changes brightness as I wave my hand over the sensors.

Navigate in various ways, teach me about robotics
Using a
Hello!!!! This is my first microcontroller robot (besides the Boe-Bot). I decided to learn to use the Arduino because it didn't seem to hard to learn, had a lot of … Read more

Which servo is better?

Hey LMR, right now the LMR start here kit is on backorder, and solarbotics is giving to different servo options, the FP-S148 Servo, and the Economy Servo (Modified). Is one better than the other? Or are they both pretty much the same? Thanks =)

v2 servo

 Is it possible to run 8 4.5v servos, 2 3v motors and a picaxe 40x1 with 3AA bateries from (V1) or should i use 3AA for (V1) batteries for picaxe and 4AA bateries for (V2) for servos and motor.Also i run motors off l293d motor driver.

This is a Hexapod Robot ive built from scractch . All parts are laser cut from 6mm acrylic It will be available as a kit form In the verry near future. The project … Read more

Darlington and Servo with Start Here project?

Hey all,

So I'm totally new to robotics, but I've read through all of the Start Here project and have a project I'd like to do. I plan to make a prop sentry gun from a game called "Team Fortress 2." All I need it to do is pan left and right, beep, and have a glowing red LED. Can the PICAXE-28 have a servo and the darlington? I was kind of confused as to if the resister and motor driver were needed for the servo or if just one would work.

Thanks for your help!

Navigate as I pre-programmed it
Using a
thanks to ndupont for giving me the idea! Well, there is not so much to say... It is very simple, a bit hard to place all the electronic stuff very close. I … Read more
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