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Help on I2C


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#41 Frank Beerens

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Posted 12 April 2014 - 06:31 AM

when i only connect the powersupply and nothing else the voltage on the 5V DC is 4.81 VDC ?

on both my Netduino's ? So what could be wrong then ?



#42 Frank Beerens

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Posted 12 April 2014 - 02:51 PM

hi

 

where do you live, could it be an idea to send display bread board and netduino to you for testing ?

(incl power power supply ?)



#43 mbrossett

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Posted 12 April 2014 - 09:44 PM

I live in the US. I think you will learn more by me walking you through the steps of troubleshooting the hardware. Even if you are only interested in software. A software person with good hardware skills is very desirable.

 

Anyway, let me do some testing on my Netduino Plus 2 tomorrow and I will get back to you with some things to try.



#44 Frank Beerens

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Posted 13 April 2014 - 05:55 AM

ok thanks. I will wait for your testing



#45 mbrossett

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Posted 14 April 2014 - 02:07 AM

Frank,I measured the 5V railed and 5V header on my Netduino Plus 2 this evening running from a 9V, 1A power supply. The outputs were both right at 5V (with no load on the 5V header). I am putting something together for you to help your test and troubleshoot your hardware. I will send it to you tomorrow when I finish it up.

when i only connect the powersupply and nothing else the voltage on the 5V DC is 4.81 VDC ?
on both my Netduino's ? So what could be wrong then ?


When you say nothing else connected, does that mean the LCD is disconnected?

#46 mbrossett

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Posted 14 April 2014 - 02:13 AM

Also if you could send some good pics of your setup that would help, too. And are you using a good DMM to make your measurements (I.e. Are you confident with its readings)?

#47 Frank Beerens

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Posted 14 April 2014 - 06:07 AM

hi studied electronics so i should know what i am doing !!

it is a long time ago i did something with it.

 

See attachments for pics.

 

Red is +5V

Green is gnd

Attached Files



#48 mbrossett

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Posted 15 April 2014 - 12:15 PM

Remove the RED wire connected to P1.1 of the display. You shouldn't have 5V tied to the RX pin. Actually since you aren't using the UART interface, you can leave P1 completely disconnected (VDD and VSS connections are already made on P2). After doing this remeasure the voltages and ensure you are getting the proper 5V to the display.



#49 Frank Beerens

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Posted 16 April 2014 - 08:51 PM

Vin 8,72

5V on netduino 4.69

SD 4.64 VDC

SC 4.63 VDC

 

you mean the left red wire.on the connector with 3 pins ?



#50 mbrossett

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Posted 17 April 2014 - 01:00 AM

Yes. You can disconnect all wires from the 3 pin connector on the left.



#51 Frank Beerens

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Posted 17 April 2014 - 10:52 AM

ok i did that then the measurement are as in the previous post



#52 Frank Beerens

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Posted 18 April 2014 - 08:10 PM

what would be the next step, buy a new one ?



#53 mbrossett

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Posted 18 April 2014 - 08:57 PM

No I don't think you need to buy a new one...yet. I have been on travel but should be able to send you something this weekend to help you troubleshoot.

#54 Frank Beerens

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Posted 23 April 2014 - 09:02 PM

hi did you find any time :-)



#55 Frank Beerens

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Posted 06 May 2014 - 08:34 PM

i bought a new netduino and a new display but still the same.

 

can somebody help me ?

 

Some one in the Netherlands or Belgium or Germany which can help me local



#56 Frank Beerens

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Posted 26 May 2014 - 07:10 PM

no one who can help me ?






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