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Jan Olof

Member Since 06 Oct 2010
Offline Last Active Feb 08 2011 08:30 AM

Posts I've Made

In Topic: LCDKeypad 16x2 HD44780 Shield

07 February 2011 - 12:40 AM

Hi The level converter is not supposed to scale a signal. It is just converting the high logic level to another voltage. Sparkfun says this: "Does not work with an analog signal." /Jan Olof

In Topic: Pull Up/Down Resistors, and when to use them?

04 February 2011 - 11:47 PM

Hi Just to be clear, you only need a pull down resistor to inhibit the activating of the relay at reset when the pin is set as a input with a pullup resistor. Fred in his relay drive circuit have found that a 2,2 K Ohm resistor was a good value. 2.2 K will only draw 1.5 mA from the available 8 or 16 mA when the output is high. /Jan Olof

In Topic: Connecting a beam load sensor to netduino

04 February 2011 - 09:03 AM

Hi Aref is the reference voltage normally connected to 3.3V. On the A version of the boards you had to have an external jumper, on the B version boards it is default internally jumpered. /Jan Olof

In Topic: SD Card Issues.

03 February 2011 - 08:37 PM

alanb Please tell us if your 4GB card works, normally they don´t (mine Sandisk 4 GB did not work). If it should work, give us some more details of model and so on. /Jan Olof

In Topic: SPI Sends Msb or Lsb

01 February 2011 - 11:10 PM

No I have not tried out SPI yet, but I have an BMA180 that I want to use so I am following SPI discussions on the forum. I am trying to understand what your resistor will do. The only thing that come to mind is that it will delay the rising edge of the CS signal as the pullup is a rather high value resistor. You could test with an small capacitor to gnd instead of the resistor perhaps 1 or 4.7 nF. You could perhaps use an other pin and manipulate the CS signal yourself, all this just to verify it is an timing issue as I think. /Jan Olof

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