Let's Make Robots!

driver

Biped Howto: Moving servos

+++ UPDATE (12-march-2014): Rename title as "Biped Howto".

Hi, I will try to explain, in a very simplistic manner, the way in which servo motors can be controlled.

Servo motors are controlled by a PWM signal, in which the active part of the signal (known as duty cycle) define the amount of degrees the servo will rotate.

High speed omni directional robot ideal for soccer bots
Using a
Now with video, Scamper appears to be a little wobbly at slow speeds but that is because at only 6%, the motors are constantly stalling and restarting. Once the … Read more

Attiny 2313/4313 servo driver

Hello everyone!

Attiny85/45s are great for small projects because nearly all pins can be used to drive servos simultaneously.

However 5 servos are nice but not enough. I found out that I have bought some Attiny4313s a while ago. They 20-pin chips that can be programmed via arduino. Now I am wondering how many servos it can control. There already are different approaches:

http://stefanfrings.de/servocontroller/index.html

Updated instruction manual for Mini Driver

The Mini Driver was released by DAGU some time ago. It is essentially our Magician controller in SMD format. Unfortunately the engineer who designed it does not have very good English so I was asked to re-write the manual. You can view/download the manual from here: https://drive.google.com/file/d/0B__O096vyVYqczRjX1k5LTRkcjA/edit?usp=sharing

Pushing the limits with encoders

This is now a tutorial and can be found here: http://letsmakerobots.com/node/39098

I've been working on some code so that a simple Mini Driver using a lowly ATmega8A can drive two motors with encoders and 8 servos. This may not sound hard at first until you remember that the Servo library kills PWM on the ATmega8. To make matters worse, D2 and D3 are the external interrupt pins but we need them for driving the servos.

Microscope Camera Driver

I recently purchased a microscope to help with soldering. As a gift I was given this camera for the microscope but no software. Does anyone know where I can find drivers for this camera?

The Service Droid is a new robot kit I am designing. It is intended to be a low cost, D.I.Y. robot chassis with two 3 DOF arms. The gripper on the right arm is … Read more
Provides better performance than normal drivers
I am participating in Google Science Fair 2013. So, I thought of sharing my idea. A simple idea. I have modified loudspeaker drivers in two ways. The benefit of … Read more

New Playful Puppy kit from DAGU

The new Playful Puppy robot kit from DAGU will be available from April 2013! This new version of the robot is smaller and easier to wire up. Magnetic clutches have been included on the pan / tilt assembly. The manual now explains the code in detail to make it easier to understand and modify.

all in one robot control board
This project aims to create an all-in-one robot control board. Unlike the arduino platforms, this board will contain servo drivers, motor drivers, accelerometer, … Read more

Motor Shield with current measurement

Hi all,

Today I want to introduce our new product - Motor Shield to you.

[img]Elecrow Motor Shiled[/img]

The Motor Shield is a platform for robotics and mechanical applications based on L298N. The biggest characteristic of this Motor Shield is it can measure the driver current via the two high power cement resistor(the two big white resistors in the picture).

Attempts to dominate the lounge room
Using a
I want to teach my seven year old son about robots. Lego Mindstorms is a cool system but way too expensive. K'nex is much cheaper and makes a great robot building … Read more

Prototype animatronic head

Well my boss is involved in organizing a robot head building contest in China and asked me to make an example to inspire the contestants. I know many will just be made from cardboard and wood but I decided that if I was going to spend time on this project then I wanted to make the most of it and develop a new product.

Driving a ride on toy car motor

Hi folks,

As part of a project I'm building I need to create a rotating platform and I recently salvaged a DC motor and its gear train from a ride on toy car, so I thought if it can scoot a child around it should have enough torque for this application. The problem is that I'm not sure how to drive it.

sn754410ne dual motor driver not working on one side (one motor)

Thanks to @JAX, it's fixed. it was related to the push button. wires maybe broken or something, going to test further. But push button  2 works for both sides of the driver so it was indeed push button 1 that did not work.

 

Hello,

A stepper motor driver where a dsPIC33 both monitors the current and controls the PWM via an L298N.
A few years ago I started building stepper motor drivers.  First it was a simple unipolar driver.  My motors wouldn't rotate faster than 1 to 2 rps.  So I … Read more

Flyback Transformer Driver

I took a flyback transformer from a crt monitor and built the driver here - http://tacashi.tripod.com/elctrncs/555sstc/555sstc.htm

Picaxe USB driver issue

I have just received my Picaxe 28X1 Starter Pack and, after an hour of trying, am still unable to install a driver for it. I am running Windows 7 Ultimate, 64 bit on an AMD Phenom II X6 1035T at 2.6 GHz (or so they say). I have tried the self-extracting, self identifying driver, I have tried the manual install. I am not getting anywhere... well, nowhere good. I have combed the rev-ed site. I assume that the driver was included on the CD I got with the starter. It seems likely that I am just missing something obvious.

Any advice will be appreciated. Thanks!  ~Allen

Pololu RP5 motor

Hi there, I have recently bought a RP5 chassis from pololu, this chassis is holding 2 brushed DC motors (6V) and I have some questions: first of all; how can I control it? I mean, do i need to control it by PWM or is just 5v or 0v?

second, I built a little pcb with a L293D to protect the controller (Arduino) from reverse current, is this ok? 

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.

H546 Unipolar Stepper motor driver

Hi, ive been trying to make a steppermotor driver for 2 http://www.active-robots.com/products/motorsandwheels/stepper-motors/datasheets/103h546-0440.pdf

I have used a ULN2003 like this:

(the second motor is in 5, 6, 7, 8 (I have a bigger ic)

L293D Motor Driver

Hey, can anyone tell me if the L293D motor driver chip can take an analog value to its input pins?

Or does it have to be a logical 1 or 0?

Just wondering if I can drive my motor at variable speeds with it, or if I only get one speed or no speed.

Here is a diagram of the chip:

 

Hi everyone, This is my most recent project. It is a robot which uses two cheap drills’ motors, that I bought a while ago for my tank. I didn’t like using … Read more

Alternate 3 pin dual motor drive?

I know enough to be dangerous to components.

I had thought about using 2 4427 MOSFET drivers and tying one input from each driver together to a single uC pin. I could then control fwd/rev with two digital pins and put a pwm signal on the shared pin. The 4427 data sheet says the input current is 10uA per pin and PIC pins are supposed to be able to source 25mA max. Is there a flaw in my thinking?

As far as a schematic, I imagine many of you have seen what David Cook has posted on his RobotRoom site.

Schottky diode bridge IC for L298N?

Hi all!

Noob question: I'm using the L298N dual full H-bridge to drive my robot's 4 motors, can someone please give me the name of a chip that contains schottky diodes in a bridge configuration, so I can use it on the outputs to block back EMF? Sparkfun does the same on their boards: http://www.sparkfun.com/datasheets/Robotics/ROB-09571-Serial%20Controlled%20Dual%20Motor%20Driver%20-%20v11.pdf

I know that there are such ICs since I recall a friend using a 16-pin DIP in a similar occasion, but I can't remember it's name. I think it started with "L".

Mini Sumo Bot Parts!

Intro

I decided to make a mini sumo robot a few weeks ago instead of doing an obstacle avoider. Turns out that once you think about it, mini sumo bots and obstacle avoiders are pretty much the same! The only changes I would need to make would be to the code. Great! Sumos can also double as line followers. So in short, they're pretty versatile. Here is an image of most of the parts that will go into this sucker. 

Picture