Let's Make Robots!
Hello here ! I have a problem on the robot that I just built. The robot moves with the help of two stepper motor and detect obstacles using two sensors … Read more

Grippers

Today I started to design a robot for a simple task of crushing aluminium pop/soda cans. 

 

An earlier non-robotic 'plan' involved a PVC (drain actually) pipe mounted as a 'handrail' on our basement stairwell, which one dropped the can into the tube and gravity whisked it away to a waiting bag at the bottom of the steps. 

 Well, we now have about 200 (no lie) cans that all need crushed and we need a plan to crush them with a minimal involvement as possible.  high capacity would be nice too.

 

Here's my shot at this challenge... I really didn't figure on how far the tail-end swings around during turns, but the basic shape is there! Read more
Price: $5.99 USD

 Collected by one member
Tamiya’s steel-ball caster is a good way to give a “third wheel” to a small robot powered by a differential drive. The kit comes with enough … Read more
Price: $5.95 USD

 Collected by one member
This 224:1 gearmotor (gearbox with brushed DC motor) has a low-current motor and provides power and speed that is comparable to an RC servo at a fraction of the … Read more
Price: $109 USD

 Collected by one member
This robot controller is by far the most powerful Orangutan, and it is intended for small and medium-sized robots. The design features a dual-AVR architecture that … Read more

A stumbling bumbling attempt at a 3D printer

Well this is my attempt a building a 3d printer, I am blaming TinHead for the whole thing, perhaps with some blame beeing focused on CtC as well and let me state here Chris and Tinhead were both a great source of encouragement and help in this on going project. The whole journey started with my seeing Tinheads build of bumble bee  http://letsmakerobots.com/node/32879

Price: $15.95 USD

 Collected by one member
This gearmotor is a miniature (0.94" x 0.39" x 0.47"), low-current brushed DC motor with 100:1 metal gearbox, similar to Sanyo’s popular … Read more
As a total moron, I've deleted the previous robot page while trying to clean some attachments   So, let's start again.. Steve the disembodied robotic arm as been a … Read more
hello LmR! This is the final product of my work on the GEO-bot! With help from you people in my previous post i could overcome mechanical problems! for those who … Read more
I've found this multifunction chip on ebay,  the official webpage is http://www.web4robot.com/ I've just bought a pair, I'll come back to post with my … Read more
hello everybody   this is my second robot avino it's a very freak robot because sometimes the code did'nt run hahaha........i don't know why   Read more
This is a coverted invaid scooter, that is being adapted into an autonomous granny gadget...... The scooter runs at 4 MPH, and is controlled by a sabertooth motor … Read more

Boosting Speakers with the Lm386

Hey All,

So I'm integrating the SpeakJet into my next project, and using the LM386 to try to boost the speakers. Unfortunately, the package didn't include any circuit (or information whatsoever, really) and Radio Shack has discontinued their databooks. So I went to the go-to info tool, THE GOOGLE! I've seen this circuit all over the place:

lm386_0.gif

A few questions about this circuit:

1. Is the .05uf cap and 10 resistor recessary if it's just going to ground?