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Jan Olof's Content
There have been 41 items by Jan Olof (Search limited from 27-April 23)
#9092 LCDKeypad 16x2 HD44780 Shield
Posted by Jan Olof on 07 February 2011 - 12:40 AM in Project Showcase
#9020 Pull Up/Down Resistors, and when to use them?
Posted by Jan Olof on 04 February 2011 - 11:47 PM in General Discussion
#8980 Connecting a beam load sensor to netduino
Posted by Jan Olof on 04 February 2011 - 09:03 AM in Netduino 2 (and Netduino 1)
#8947 SD Card Issues.
Posted by Jan Olof on 03 February 2011 - 08:37 PM in Netduino 2 (and Netduino 1)
#8849 SPI Sends Msb or Lsb
Posted by Jan Olof on 01 February 2011 - 11:10 PM in Netduino 2 (and Netduino 1)
#8844 SPI Sends Msb or Lsb
Posted by Jan Olof on 01 February 2011 - 09:39 PM in Netduino 2 (and Netduino 1)
#8557 Analog Read
Posted by Jan Olof on 27 January 2011 - 02:50 PM in Netduino 2 (and Netduino 1)
Well I'm stumped. I don't think the netduino can measure current directly. You might need something like this that outputs varying voltage:
http://www.sparkfun.com/products/8883
Thats overkill!
You only need a resistor. Calculated by Ohms law.
You need a voltage drop of 3.3 V at 20 mA, and then you just measure the volage over the resistor with the analog input of the Netduino.
165 Ohm at 20 mA gives a drop of 3,3V (max for the Neduino analog input) (U=R*I)
I would select the one closest below 165 Ohm I can find, with 1% accuracy I would take 162 Ohm.
/Jan Olof
#8103 1-WIRE
Posted by Jan Olof on 22 January 2011 - 03:54 PM in Netduino Plus 2 (and Netduino Plus 1)
#8098 Add Reference .NET tab empty
Posted by Jan Olof on 22 January 2011 - 09:35 AM in Visual Studio
#7667 NetDuino Quadrocopter
Posted by Jan Olof on 14 January 2011 - 05:51 PM in Netduino 2 (and Netduino 1)
#7642 NetDuino Quadrocopter
Posted by Jan Olof on 14 January 2011 - 08:51 AM in Netduino 2 (and Netduino 1)
#7501 Powering Netduino+ with 5V
Posted by Jan Olof on 12 January 2011 - 09:26 AM in Netduino Plus 2 (and Netduino Plus 1)
#7486 Powering Netduino+ with 5V
Posted by Jan Olof on 12 January 2011 - 12:48 AM in Netduino Plus 2 (and Netduino Plus 1)
#7481 Powering Netduino+ with 5V
Posted by Jan Olof on 11 January 2011 - 11:55 PM in Netduino Plus 2 (and Netduino Plus 1)
#7479 Powering Netduino+ with 5V
Posted by Jan Olof on 11 January 2011 - 10:54 PM in Netduino Plus 2 (and Netduino Plus 1)
Looking at the schematics and using some google, it looks as though it is 800mA.
The question is how good the regulator is cooled, if you supply with 12V you have to drop 7V
with 0,8A that makes 5,6 Watts to dissipate as heat (7,5 V supply you only have to drop 2,5V that makes only 2W as heat).
Chris:
Would a good solution be to supply +5V (a little more than 2A) on the VIN header, that would then power both Netduino+ and cellular shield one like this
/Jan Olof
#7473 Powering Netduino+ with 5V
Posted by Jan Olof on 11 January 2011 - 10:30 PM in Netduino Plus 2 (and Netduino Plus 1)
#7469 Powering Netduino+ with 5V
Posted by Jan Olof on 11 January 2011 - 09:28 PM in Netduino Plus 2 (and Netduino Plus 1)
#7422 Full-featured driver / test code for the Maxim DS1307 real-time clock
Posted by Jan Olof on 10 January 2011 - 06:55 PM in Project Showcase
#7419 Remote heating regulation
Posted by Jan Olof on 10 January 2011 - 05:46 PM in Netduino 2 (and Netduino 1)
#7405 Remote heating regulation
Posted by Jan Olof on 10 January 2011 - 09:14 AM in Netduino 2 (and Netduino 1)
#7363 Reading temperature from DS18B20 using OneWire
Posted by Jan Olof on 09 January 2011 - 09:49 PM in Netduino 2 (and Netduino 1)
#7357 SD card
Posted by Jan Olof on 09 January 2011 - 08:11 PM in Netduino Plus 2 (and Netduino Plus 1)
I was blind did not see it in .NET under add references!
I did know about be and le but completly forgot when I found the reference.
It works now so I can see the directorys on my SD card.
Thanks again!
/Jan Olof
#7351 SD card
Posted by Jan Olof on 09 January 2011 - 07:10 PM in Netduino Plus 2 (and Netduino Plus 1)
#7349 SD card
Posted by Jan Olof on 09 January 2011 - 06:59 PM in Netduino Plus 2 (and Netduino Plus 1)
#7344 Analog in put C# coding
Posted by Jan Olof on 09 January 2011 - 04:19 PM in General Discussion
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