Review or Discard at Will

Dottie; BoeDuinoBot.Net

  Meet Dottie (Doing Other Technology That Is Extensible) my BoeDuinoBot.Net Robot built on a Parallax Boe-Bot (parts kit) with a netduinoPlus (a netduino is in the mail somewhere…) rather than a basic stamp. Note the Parallax Li-ion Power Pack Mounted under my BoeDuinoBot.Net RCB (Robot Controller Board). I’m planning to control the Boe-Bot from Arduino and Netduino. I’m building a PCB shield to support both platforms. Check out my effort to move from concept, prototype to PCB board. I learned about Fritzing and etched my own PCB at home with a toner transfer method using an easy process using laser printer and clothes Iron. I’ll be blogging further on this project as I drill the PCB and install it on Dottie, add sensors and continue refactoring BoeDuinoBot.Net. Dottie got off to a little bit of a wobbly start in this very first prototype of the basic hardware platform. Uncentered servos and a high center of gravity will be fixed right away. Read on.     Running this code on Dottie results in the following wave form. using SecretLabs.NETMF.Hardware; using SecretLabs.NETMF.Hardware.NetduinoPlus;   namespace CenterServos { public class Program { public static void Main() { PWM leftServo = new PWM(Pins.GPIO_PIN_D5); PWM rightServo = new PWM(Pins.GPIO_PIN_D6);   leftServo.SetPulse(20000, 1500); rightServo.SetPulse(20000, 1500); } } }   Very solid 1.50ms pulse for center and the frequency of 49.75 reciprocal is pretty darn close to 20ms keep alive. The continuous motion servos were no where near centered. Continuous motion servos should be still with no rotation when fed a 1.5ms signal. I adjusted a set screw on the servos to stop there motion while being fed this signal generated from the previous code. Centering the servos and lowering the center of gravity has improved Dottie’s stability.   Here is the program I ran for the above video. Not sure I want to share the boeNetBot class yet until I clean it up a bit. It’s a mess right now. Hmm… The code insert plugin expanded all my carefully collapsed #regions I had created to increase readability. The commented out code might be instructive. Some of the test I ran in development of Dottie. Note: This is pretty early code....

12vdc Motors Matched Set; possible robot drive

I found these mirrored left and right motors for $24. They were apparently automotive windshield wiper motors. I’m looking for ideas on how to mount a wheel of say something like five inches to them. In the first picture are some hubs I found at a hobby store. One disadvantage to the tires I’ve found in the hobby stores so far is they don’t appear to be designed to carry much weight. I might have to use a solid tire. I’d rather use a tire with an inner tube or otherwise more solid. Do you know any resources for small tires, wheels, and hubs? Anyone have a metal lathe I can use or you can help me to turn these down enough to accept those hubs? Note in the partially dismantled picture the nylon gear. I hope that could be pressed off and back on again to allow the shaft to be mounted in a lathe. I found this site http://dumpstercnc.com/ that has shaft couplers and collars. Perhaps you know alternate sources? Or how to make them? I’d really appreciate some brain storming on this. Comments, suggestions, ideas are solicited and welcome. Is there a hacker space that has metal working lathes and mills? I’m currently in Los...