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2851  Forum 2005-2010 (read only) / Italiano / Re: acendere e spengere  220v on: May 28, 2010, 01:52:49 pm
se quella è l'unica differenza, direi di si, dovrebbe...
2852  Forum 2005-2010 (read only) / Interfacing / Re: MCP23017 to control servos on: October 21, 2010, 12:00:49 am
tank you for your answer, but i like diy smiley
i think i'll build it on my own. :smiley
2853  Forum 2005-2010 (read only) / Interfacing / Re: MCP23017 to control servos on: October 20, 2010, 12:45:39 pm
do you mean a bare bone arduino board with the bootloader etc.. or an atmega 168 programmed to do only that kind of job?
2854  Forum 2005-2010 (read only) / Interfacing / Re: MCP23017 to control servos on: October 20, 2010, 12:36:57 pm
good point!
i new that bitbang is the hard way, but i wanted to avoid other programmable logics, like pic etc..
i  was looking for something simpler.. i don't want to learn pics too..
any other idea? smiley
2855  Forum 2005-2010 (read only) / Interfacing / Re: MCP23017 to control servos on: October 20, 2010, 12:22:07 pm
for the 5940, there is a library in the playground for servo driving smiley
http://code.google.com/p/tlc5940arduino/downloads/detail?name=Tlc5940_r014.zip&can=2&q=
what would you use to drive 16 servos?
i'm looking for a cheap solution, possibly using i2c.
2856  Forum 2005-2010 (read only) / Interfacing / Re: MCP23017 to control servos on: October 20, 2010, 11:53:47 am
so, if i  don't misunderstood, the best solution for you is to use something like a pic16f84 to have at least 8 pwm ports and then dasychain them?
we managed to drive servos with tlc5940 and i tought was more or less the same soup with the mcp23017...
2857  Forum 2005-2010 (read only) / Interfacing / Re: MCP23017 to control servos on: October 20, 2010, 11:17:20 am
so, i can't drive 16 servos with arduino and the mcp2317 even if i use the software servo lib?
2858  Forum 2005-2010 (read only) / Interfacing / MCP23017 to control servos on: October 20, 2010, 09:58:05 am
Hi,
i want to drive as many servos as i can and i have a MCP23017, do you think it can control servos as is or should i buffer the outputs to have more current on every pin? maybe with an uln23xx..
2859  Forum 2005-2010 (read only) / Interfacing / Re: Stepper motor controller on: July 01, 2010, 11:31:51 am
you touched the hot point! the back lash errors are cumulative , so if you want to start to build something good you will have to think on a scale that is not in the range of millimeters. but fractions of millimeters. And you should use tools as precise as much the machine you are building (al least), and in particular way a pcb milling machine should work under the 0.1 mm.
another matter is the probable step loss due to interrupts...
2860  Forum 2005-2010 (read only) / Interfacing / Re: Servo Read Position on: July 01, 2010, 11:43:10 am
Correct! again..
found
http://forums.trossenrobotics.com/tutorials/how-to-diy-128/get-position-feedback-from-a-standard-hobby-servo-3279/
2861  Forum 2005-2010 (read only) / Interfacing / Re: Servo Read Position on: July 01, 2010, 11:36:50 am
Correct!, I had not thought, but the idea is that one.
what do you think? could we do it?
2862  Forum 2005-2010 (read only) / Interfacing / Re: Servo Read Position on: July 01, 2010, 11:17:51 am
what if you solder two wires, the 1st to one pin of the servo pot and the 2nd to the washer pin of the pot and then try to read (with an analogread) the value of the voltage? :smiley
2863  Forum 2005-2010 (read only) / Interfacing / Re: Brushless Motor and arduino on: June 22, 2010, 04:17:01 am
you can use a device like this http://www.datasheetcatalog.org/datasheet/toshiba/4077.pdf
2864  Forum 2005-2010 (read only) / Interfacing / Re: 4Mbps Data transfer with arduino! on: June 22, 2010, 04:19:16 am
i think arduino will be unable to process such amount of data
2865  Forum 2005-2010 (read only) / Interfacing / Re: Arduio with light sensor on: June 22, 2010, 03:53:45 am
what about a force sensitive resistor?
you could know if the cup is full or empty smiley
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