Let's Make Robots!

PICAXE Sound Detector Circuit



The circuit above is how to hook up a microphone to a picaxe to either have it detect the presence of sound (using a digital pin) or the sound level (readadc). The question I have is in a couple spots it connects a capacitor to the middle of a resistor. Does this mean you connect it to both sides of the resistor?

Roams around until it runs into something. Then it gets scared and tried to blend in.
Using a
I was hoping to finish this robot in time for the Mr Basic DAGU II competition, but I doubt I will have it done in the next 24 hours. Here is what I have so far! Read more

PWM Question with PICAXE 40x1

The 40x1 has 2 PWM pins. I have the code pwm 1, b2, 1 but I think I need to tell the picaxe that I want to use the pin as PWM since it can also be an output or input pin. Any ideas?

XMOS - Tutorials

My XMOS entry was to create tutorials that not only taught how to use the XMOS but also lead up to explaining complicated robotic principles as well as good coding standards. So far I have been trying to figure out what to make a tutorial about. Below is my list which I will add or subtract from depending on the XK1's capabilities and the complexity of the tutorial.

Where is Jklug80?

So a few have noticed that I have not been on as much lately. Long story short we bought our first house which needed some work. A week prior I decided to go back to school for degree number 3. This time a masters in Computer Science. One class I am taking is Mobile Robotics. Our first project (we present it tomorrow and work on documentation) is a Rube Goldberg type device. The project must use 7 energy transfers from non electrical devices (marbles, dominos, etc hitting each other) and 3 electronic (sensors, motors, etc).

Admin Edit:

Wherever you see Admin Edit: in a post it is because as I see posts that need cleaned up (title changed, useless posts removed, etc.) I am editting them and cleaning them up. We need to cut down on posts that have no relevance to the original post. This just makes too much to read for those who are catching up and doesn't help anyone. If you see a post that needs some cleaning send it to me as a private message and I will look at it.

LM3914 Dot/Bar Display Driver Question

I got some of these because I thought I could use it on a project I am working on as well as one on the drawing board. I will admit I haven't read the entire datasheet word for word but I have looked for the part that talks about how to pick which one of the 10 LEDs hooked up that I want lit and to what levle I want it lit (really bright or barely visible).From what I read I thought it could have 10 LEDs connected and light anyone of the 10 and to a certain degree of brightness. Maybe I was wrong.

Movie Editor Recomendations

I have a video recorder that does HD, but the software that comes with it will edit th emovie and change the resolution to 640x480 instead of the original resolution of 1280x720. Anyone have a recomendation for a video editor that is free or fairly cheap that will edit HD vids without changing the resolution and if possible also allow the video to be cropped so it will only show the robot and not everything around it if the video is farther away.

 Windows Movie Editor changes the resolution so that isn't an option. The video editor needs to work in XP or ubuntu.



Is anyone here good with diptrace? I am going to make a board for my led matrix when I start working on it but I need to create a tri-color LED using the specs found here. Once I finish the project (still waiting on LEDs) I want to solder it all on a professionally looking board. Perf board has holes that are too far aprt for the tri color LEDs. I need a quick walkthrough on how to make a component with specific dimensions.

Color Sensor Algorithm


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.