Let's Make Robots!

Evolution of technology

I thought this pretty cool

Cute Lego Felt Tip Printer

A friend forwarded this to me. Cool application of Lego to make a printer. The video author's comment on YouTube:

"Lego felt tip 110" printer connected to an Apple Mac.  This is not a kit you can buy and does not use MindStorms. I designed/built/coded it all from scratch including analog motor electronics, sensors and printer driver, the USB interface uses a "wiring" board.

Once again, this is not my work. I'm just posting something I found cool.

 

 

PIC to Ligicator - Serious noob here

Hey all, ive just received quite a few componants tho i dont know what most of them do, i am learning about the datasheets of each peice that i have tho, i just need to know a few things and any support i can get to get this thing rolling...

Processors i have:

uM-FPU coprocessor (V2) // PICAXE-08M microcontroller // PICAXE-18X microcontroller //PICAXE 28X2 microcontroller

 

my goal is to interface with the program called "logicator" so i can see the code and learn from it and eventually code my own output

i have:

Adjusting for air/water current

First a terminology question:

What do you call the direction a boat/plane is pointed?

Yeah it is a silly nit, but I am documenting a design and people will pick nits. A simple example is a boat crossing a river. For simplicity, consider the river flowing from N to S and boat crossing from W to E. So the bearing/heading is E. But if point the boat due E you will go SE, so you have to point the boat NE. When I learned to kayak, this was called ferrying and the angle was referred to as "set", but I hate using such an overloaded term.

solar trickle charger-solar engine

Hi, can anyone help?

I am trying to make my robot battery powered with trickle charge with two solar panels.

Sending a int using VirtualWire

I've got the basic examples reciever and transmitter working sending the default "hello" message.

But I really want to send a int, for example 45 or another value over RF links. Can't understand how to rewrite it to do so!

 

Anyone care to help me out?

 

Reciever code:

 

#include <VirtualWire.h>

#undef int

#undef abs

#undef double

#undef float

#undef round

void setup()

{

    Serial.begin(9600); // Debugging only

dagu wild thumper batteries

hi, 

 

I think I'm gonna buy a dagu wild thumper chassis or make something like one... but I was thinking...

the  motors are 6.6A max each, there are 6 of it, so you gotta be prepared for 39.6A max just for the motors... and I think I'm gonna do my own H bridge from mosfets... but whatever... I was looking for battery options. I searched on hobby king for lipo batteries, and I found that the 5000 maH are one of the bests, also are like $17 or something, but I just calculated here:

DIY H-Bridge for Tamiya double motor gearbox

Newbie alert!

Hi all,

First forum post here. Go easy on me. I have not been able to find a solution to my problem in the forum, (even though a couple came close) so I´ve decided to go to the source.

Is this http://letsmakerobots.com/files/H_bridge_single_relay_DPDT.pdf a good H-Bridge to use with the Tamiya double motor gearbox? If not, can someone point me in a better direction?

My apologies if this has came up before and I have failed to find it.

Cheers,

Andrés 

Best way to Power an 8 servo - Quadbot

Hi. I want to power a Dagu Qadbot without sources, only batteries, but don't know the best way to Do it. It uses 8 micro servo - 8g, 4~6V, and draw a current that I don't know the specific value as I didn't find a Datasheet.

 

So, as I'm almost sure that only Arduino will not be able to power the 8 servos, I'm thinking about 2 solutions:

 

1st - Use 4AA Battery to power - the Arduino i parallel with the servos. This way I'd power the servos directly and just connect the digital pin to the arduino. 

LMR Job database

UPDATE:

Thanks for all the feedback :) We are considering everything while working on LMRv4 - and for now this is off the top menu on this "old" site.

 

 


 

Old post below:

 


 

Hi guys,

I am planning considering to make a new top menu item: Jobs (Well, I made it, just to see how it would look up there ;)

Battery Question


I have a laptop battery that is still very good these are its ratings:

Dagu Rover 5 & Arduino Uno /Help

Hello everyone.

I'm trying to make a robot for experimentation, something i can use in my studies aswell. I'm studying Electronics & Computer engeneering, first year, and i want a platform that i can improve in the years to come. 

I started playing around with LEDs and an arduino some time ago, this week i bought a Dagu Rover 5 with 4 motors and 4 encoders. The problem is i don't have the 4 channel DC motor controller. 

The best all-terrain robot I've ever scene

This was mentioned in a post awhile back (http://letsmakerobots.com/node/27879), but I thought it was awesome enough to post the video here.