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There have been 78 items by Kermit (Search limited from 28-September 23)
#28437 PIR Murata E710 ST0
Posted by Kermit on 02 May 2012 - 10:29 AM in General Discussion
#28410 PIR Murata E710 ST0
Posted by Kermit on 01 May 2012 - 11:12 PM in General Discussion
I tried to use the sample code I found at http://forums.netdui...h__1#entry17181 and http://forums.netdui...h__1#entry26933 thinking that it would be the same, or similar, but no way... :-(
Andrea
#29279 General Utilities
Posted by Kermit on 16 May 2012 - 05:43 PM in General Discussion
Attached Files
- __ReadMeFirst.txt 4.14KB 30 downloads
- GeneralLibrary.zip 178.23KB 11 downloads
#28692 Modbus-TCP is now for Windows Phone too
Posted by Kermit on 08 May 2012 - 09:20 PM in Project Showcase
So, the only way was connecting them via serial: specifically UART, using the RS-485 interface. That's still a very good solution, because it's the only answer to several constraints:
- simplicity (both hardware and software);
- cost effective (can be realized even on a half-Euro MCU);
- reliability (very high noise immunity);
- very long distance wiring (up to 1.2km);
- worldwide standard, thus thousands of sensors can be plugged without no effort;
- no need of permissions, instead of most radio-based systems (*).
Mario, here you said that we can realize an RS-485 connection with half-euro: could you elaborate on this, giving some advice, for us mere mortals? :-)
Thanks as usual from Città di Castello! :-)
Andrea
#28707 Modbus-TCP is now for Windows Phone too
Posted by Kermit on 09 May 2012 - 10:17 AM in Project Showcase
#28712 Modbus-TCP is now for Windows Phone too
Posted by Kermit on 09 May 2012 - 12:04 PM in Project Showcase
#27846 Many many PWMs
Posted by Kermit on 21 April 2012 - 08:01 PM in General Discussion
#27871 Many many PWMs
Posted by Kermit on 22 April 2012 - 06:45 AM in General Discussion
#27805 Many many PWMs
Posted by Kermit on 21 April 2012 - 11:09 AM in General Discussion
Yes, the first straight answer could be to buy more Netduinos, but it's not only a cost problem: then I'd have to sync all together, that would be another big problem!
What I'm thinking about, is there some solution where I first select an 'address' (to be considered in a wider sense...), and then I set a duty cycle? The 'subcircuit' (or something like that) should retain that value, be self-powered, and going on supplying the exact pulse until maybe I re-select the same 'address', and put out a new value.
The first idea coming to my mind is to use many shift register chained in SPI, where, using the output pins of each shift register, put out a 'value' to feed to something else to be used as a PWM source (and obviously I don't know how to create such a thing...).
I googled everywhere, but I couldn't find any good start, so I'm really at zero! :-(
Is there anyone pointing me to a good direction?
Thanks in advance
Andrea
#27812 Many many PWMs
Posted by Kermit on 21 April 2012 - 12:26 PM in General Discussion
PWM IC:
http://www.sparkfun.com/products/10136
On a breakout board:
http://www.sparkfun.com/products/10615
...ehm... I don't know how to tell it in English, but right now I have a big big red face... :-(
Andrea
#26564 How to drive train models
Posted by Kermit on 05 April 2012 - 06:01 PM in General Discussion
can you give a look at this thread?
http://www.avrfreaks...ewtopic&t=60979
It looks like leveraging low data frequencies, some result can be obtained.
I cannot understand the technical details, but someone agrees, some other not! :-)
Andrea
#28436 How to drive train models
Posted by Kermit on 02 May 2012 - 09:53 AM in General Discussion
#26563 How to drive train models
Posted by Kermit on 05 April 2012 - 05:41 PM in General Discussion
#26423 How to drive train models
Posted by Kermit on 04 April 2012 - 02:48 PM in General Discussion
After reading books, googling around, I decided to start from the first problem (probably the easy one): controlling a lot of leds or similar devices on a wide surface (10 meters x 4 meters). Since actually there are really a lot of wires and cables, I think that using shift registers chain-linked each other and put in smart positions can save a lot of these cables.
This simple drawing can give the idea, I hope: the shift registers act as local 'pits' where to connect leds to, so I need only a three wires cable going all around, and the local (short) connection to peripherals.
Moreover, I think that netduino cannot power everything, so I'll have to add a power line going all around, and transistors to act as switches to activate the single peripheral, when put on.
It looks like it can become all very clean and simple, if this is a feasible solution...
Before starting testing, I would like some good advice, if possible: thanks in advance, as always!
Andrea
#26185 How to drive train models
Posted by Kermit on 31 March 2012 - 10:16 AM in General Discussion
#26201 How to drive train models
Posted by Kermit on 31 March 2012 - 04:48 PM in General Discussion
#26570 How to drive train models
Posted by Kermit on 05 April 2012 - 06:54 PM in General Discussion
http://www.ti.com/li...441/slyt441.pdf
It looks interesting.
Andrea
#28405 How to drive train models
Posted by Kermit on 01 May 2012 - 09:33 PM in General Discussion
#26164 How to drive train models
Posted by Kermit on 30 March 2012 - 09:36 PM in General Discussion
#27752 How to drive train models
Posted by Kermit on 20 April 2012 - 09:10 PM in General Discussion
#27722 How to drive train models
Posted by Kermit on 20 April 2012 - 03:12 PM in General Discussion
#26590 How to drive train models
Posted by Kermit on 05 April 2012 - 09:41 PM in General Discussion
#28392 How to drive train models
Posted by Kermit on 01 May 2012 - 04:52 PM in General Discussion
#28388 How to drive train models
Posted by Kermit on 01 May 2012 - 01:09 PM in General Discussion
#27796 How to drive train models
Posted by Kermit on 21 April 2012 - 08:48 AM in General Discussion
Did you spot the problem? - The Netduino only has 4 PWM outputs, so you might need to use a PWM shield to get enough PWM outputs for your 5 sets of rails.
Hi, Paul, since my first tests are ok, I'm now thinking again to the problem of loco controlling.
You told me about a pwm shield, I saw it, and I think it can be a good (and cheap!) solution. What I cannot understand is that to me it seems that I'm using in the shield the same PWM pins that I have on the Netduino, so I cannot reach the five PWM that I need.
Moreover, if I understand it well, I need TWO PWM pins to control a single loco? Forward/reverse? Please, can you give me some hint?
Andrea
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