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meterMan

Member Since 17 Jan 2012
Offline Last Active Jul 30 2012 12:13 PM

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In Topic: Voltmeter for measuring millivolts

04 May 2012 - 09:03 PM

Can't say I've made much progress at all Billy. I think I need to use the AD623 to amplify the voltage from the sensor. http://www.analog.co...heets/AD623.pdf

In Topic: Voltmeter for measuring millivolts

01 May 2012 - 02:06 PM

Hi Mario, A few firm facts for you which should help. The device im working with is a pyranometer, same as here: http://www.kippzonen...131/CMP 3.aspx. It supplies a low voltage of 0-20mV. There are 3 wires; ground, positive and negative. And the data sheet with my pyranometer is 32 Ohm across a 10m cable. Data sheet for CMP 3 here: http://www.kippzonen...anometers.aspx. Is this workable with the Netduino? Really appreciate everyones assistance! I take it the Netduino can't measure such a tiny voltage? I just took a reading using my multimeter and its at 0.0055 (5.5mV).

In Topic: Voltmeter for measuring millivolts

29 April 2012 - 10:48 AM

Hi, hope this helps. The actual voltage range is from 0 to 150 mV. Max error rate is 1 bit. No idea of the impedance. Its coming over a 10metre cable from a sensor. Surely the number of readings per second is whatever I want it to be? I.e. how many times I do read the analog input. The voltage range coming in the cable from the sensor is constant, according to light levels, in basic terms... Only the 1 sensor, therefore only using 1 analog input on the Netduino. I don't need to to convert the reading back to the analog value, i can work with the 0-1023 range. But its useful to know anyway.

In Topic: Modbus

18 April 2012 - 03:08 PM

Hi Mario, did you get around to releasing the modbus stuffs you have been working on? Im keen to see what you have come up with.

In Topic: LED 8x8 matrix wiring

11 April 2012 - 02:44 PM

I have one of the MAX 7219 IC chips that I have been trying to get working with my 8 x 8 LED matrix. Im pulling my hair out trying to figure out how to get it working. I've wired it up exactly as they have done so here: http://weblogs.asp.n...-right-way.aspx All 64 LEDS are currently turned on. I've lifted some code from the netduino.helpers library using the MAX72197221.cs and ExtendedSPIConfiguration.cs classes and used the example Program.cs for the Max72197221. But it is not doing anything. Any ideas?

meterMan

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