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4861  Using Arduino / Motors, Mechanics, and Power / Re: Cant afford a motor controller want to make my own fr 10$ on: October 27, 2012, 12:32:59 pm
For only $10 investment you might try some of the motor controllers on ebay. Some h-bridge chips have have dual h-bridges on them that might be paralled to control higher current. Good luck!

http://www.ebay.com/sch/i.html?_sacat=0&_from=R40&_nkw=arduino+motor+driver&rt=nc&LH_BIN=1
4862  Using Arduino / Project Guidance / Re: project ideas and help for a innovative science project on: October 27, 2012, 12:10:34 pm
No no, I dont mean to waste anyone's time, all I want is a good idea. smiley

You really need to be more specific as to the area in which you are trained. Are you high school science or university engineering? Is there any $$$ budget involved? Energy and waste management might be good areas to explore as the world's resources shrink. 
4863  Using Arduino / Motors, Mechanics, and Power / Re: Cant afford a motor controller want to make my own fr 10$ on: October 27, 2012, 11:51:33 am
If yout bot it is just going to be an RC bot, then you might want to considerr using continous rotation servos for the drive motors. Google and youtube search for terms like "RC robot" to see what others have done.
4864  Topics / Home Automation and Networked Objects / Re: Interfacing Ethernet Shield with Python on: October 26, 2012, 10:39:25 pm
It appears that your python web server will also need to operate as a client of some type to connect to the arduino ethernet shield. Have you figured out that part?
4865  Using Arduino / Motors, Mechanics, and Power / Re: TLE5205-2 Problems on: October 26, 2012, 10:28:13 pm
You might need to get a higher current h-bridge like below.

http://www.ebay.com/itm/30A-H-bridge-Coreless-Motor-Driver-Forward-Reversion-Brake-For-Smart-Car-Arduino-/180983568079?pt=LH_DefaultDomain_0&hash=item2a237616cf
4866  Using Arduino / Motors, Mechanics, and Power / Re: TLE5205-2 Problems on: October 26, 2012, 05:09:18 pm
What is the starting current and running current of the " ampflow motors " you are trying to control? The tle5205 is only rated for 5a and you may be trigggering the internal short/overload protection of the chip.
4867  Using Arduino / Motors, Mechanics, and Power / Re: TLE5205-2 Problems on: October 25, 2012, 10:03:42 pm
If you can get one (available on ebay), you may want to try the  TLE5206-2 as it more like the typical h-bridge in operation.
4868  Using Arduino / Motors, Mechanics, and Power / Re: Motorizing a valve, which of this two options is better? on: October 25, 2012, 09:59:39 pm
Depending on the application you may be able to use some silicone "plumber's grease" on the ball in the valve to make it turn easier.
4869  Using Arduino / Networking, Protocols, and Devices / Re: Arduino can't read data from router's serial port on: October 24, 2012, 10:23:28 pm
without max3232 Arduino can't get signal at 3,7 V.

Just connect the router tx to the arduino rx, and connect the the router and arduino grounds together. The arduino probably can read a voltage down to 2.2v or maybe 1.2v on its rx pin.
4870  Using Arduino / Networking, Protocols, and Devices / Re: Arduino can't read data from router's serial port on: October 24, 2012, 10:00:17 pm
The point you may be missing is that the max232 inverts a TTL signal into an rs232 signal. AKA, using the max232 chip is probably what is causing the problem by inverting the signal. Router probably outputs a TTL signal and the arduino uses TTL input (the pc probably requires the inverted rs232).
4871  Using Arduino / Networking, Protocols, and Devices / Re: Arduino can't read data from router's serial port on: October 24, 2012, 09:32:25 pm
Quote
My router has 3,7 V on UART so i decied to use MAX3232 to convert to 5V TTL levels.
After i checked port by reading router's boot log by terminal program (9600,8n1) on desktop PC with physical rs-232 COM port. Everything is readed fine!

 Hmmm...  smiley-cool
4872  Using Arduino / Networking, Protocols, and Devices / Re: Arduino can't read data from router's serial port on: October 24, 2012, 09:07:00 pm
The arduino serial input should be TTL, so you may not have to use the max232.
4873  Using Arduino / Motors, Mechanics, and Power / Re: Linear Actuator Control on: October 23, 2012, 11:02:02 pm
The usual linear actuator setup has an actuator with pot feedback and an h-bridge to operate it. Below is one source of linear actuators. Getting .100" precision over 12" of travel will be difficult and require some extra effort on your part. 

http://www.firgelliauto.com/
4874  Using Arduino / Project Guidance / Re: a plee to the arduino gods on: October 23, 2012, 08:38:36 pm
The below page has some diagrams on using relays to reverse a motor. You could probably make a reversing switch operated via a servo if needed.

http://web.comporium.net/~shb/switch.htm

4875  Topics / Robotics / Re: Mini Spray Nozzles and Painting on: October 22, 2012, 07:01:34 pm
Get an inkjet cartridge and see if you can get it to squirt. The small perfume/cologne squirt samples have small spray heads that might be of use.
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