Let's Make Robots!

Color Sensor Algorithm

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I know the video quality sucks I just wanted to give a view of  what it is doing. The black tube has the LDR in it to hide stray light. Below is a tabl eof the values I got for Red, Blue and Green when different color soda caps were put in front of the LDR. Now I need to take the raw values and put them into some sort of algorithm that looks at the difference between the values before a cap is put in place and after to determine the cap color.

 

 

How to Make LEDs Brighter or Dimmer Using PICAXE 40x1

I have an idea for my next project after my color sensor and Mr Basic kit, but I need to control a ton of LEDs using 3 picaxe 40x1s. I need to be able to adjust the amount of current to the LEDs using the out pins of the PICAXE 40x1. I know I can use resistors, but I need the pic to be able to adjust them on the fly. Any ideas? I was looking at PWM but the manual says it is x2 only. I also need to use every out pin on the picaxe 40x1 as well as converting the in/out pins to out. Basically I will be controlling 144 tri color LEDs and select the brightness of R G and B to make a custom color.

How to Hook Up a Potentiometer

I googled it and I still cant measure the resistance of a pot using a multimeter. I put 4.5volts on the left pin and tried to measure using the middle pin and the right pin and nothing. What am I doing wrong?

Tri-Color LED Resistor Question

I've seen Oddbots tutorial about LEDs and picking the right resistor, but since this LED costs a few bucks and the wordage is different on Radio Shacks parts I want to make sure I have it right.

Supply coltage is 5 volts
Forward Current 30mA (green/blue), 50mA(red)
Forward Supply 3.5 volts typical, 4 volts max (green/blue); 2 volts typical, 2.6 volts max (red)

Tutorials

I have 2 robots I am working on, but I also want to toss making turorials on my list. We have a lot of good ones out there, but I want to make some that cover the basics (making an LED blink, then making 3 leds light in a certain order, adding sensor X, etc until it makes a robot). The eventual goal is making the tutorials teach not only how to make stuff but also teaching good coding skills (using tabs in code, proper documenting, white space, when to use GOSUB, etc) as well as slowly teaching components as they are used.

LMR Global Project - Idea Phase

This thread will allow the build team of Jklug80, rik, Calculon320, slick, Edgee, CaptainTune and robologist to start working on the project and figure out what it is, what it will do and how to build it.

Currently the goal is to decide what the project is (what jklug80 proposed or something else), then we need a name for the robot, then we need a name for the group of 7 who are working on the project. We need a list of desired features, a list of REQUIRED features, and who will do what. LETS GET STARTED!

LMR Global Project

I know we have talked about this before, but I would like to get this going. I had an idea for a bot that I will likely never have the time to build msyelf. At least not for a couple years since it requires a lot of parts that I would have to figure out first and test. I would like to present that idea and find 3-5 other people who would like to work on a part of it and combine our efforts. We each post how to make our part and then we all share credit for the final project.

Returning to home base

I have an idea for a robot that would also involve it going to a wall charger when the batteries get low. I have an idea for it to send out an IR signal when the batteries get weak. The signal is received by the charging unit and it turns on a laser light. When the robot roams through the beam it detects it and uses it to align itself with the charging unit.

I know some won't consider this a "robot" because it lacks a brain, but it is still fun and worth mentioning. Anyone who is familiar with Cub Scouts, Boy Scouts, or … Read more