Thats why i need someone to help me. I do not have working code or a logic analyzer.

i don't think i will have a problem with the code but more with the hardware connection.

I think I2C is not working, is there a simple way to test it ? 

Hi

last year i started a project with a display from newheaven on i2c

http://www.datasheet...ernational.html

But i never got it working.

Is there someone who could help me with this ?

(maybe in the netherlands or belgium ?)

Frank

that is one of them i tried, but also tried an i2c display from newheaven.

i'm not home now, so i cannot check which one exactly

Hi

i'm trying to get i2c up and running with a lcd display. the last half year i did not get it running.

Can someone help me ? If posibele in the Netherlands then i can come over physicaly.

Frank

oke thanks, i will order one of those displays. But do you have the source code for me for these displays ?

Which resistors should i use and which voltage for these?

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

ok thanks, finally it arrived.

i ordered the NHD-420D3Z-FL-GBW-V3.

is het hole with the square pin 1?

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 ?

Hi it is a dutch site

https://www.iprototy...cts/components/led-lcd/lcd16x2-I2C-BL

there is a library for arduino on that site.

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

finally found someone to solder for me.

Now i connected the power supply from the netduino but the lcd does not turn on ?

Is the power of the netduinoe not enough for the lcd ?

oke the square does nog seem to be pin 1. but the oppesite pin seams to be pin 1.

When i connect the power supply the lcd lights up.

i connected SDA and SCL to the SDA en SCL connectors on the netduino 2.

The code is running but i do net get hello on the lcd ? Wat can i test to get it up and running ?

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

1. Yes there  is.

2. The voltage is 4.23V is that high enough ?

3. Delay does not help.  When debugging i can make a delay also

4. the return value is zero, also when i disconnect the i2c bus ?

5. I tried it is returning zero but the brightness does nog change

any other things i can do ?

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

to be sure

i have a netduino plus 2 i connected sda/scl to the sd/sc connector

that is correct ?

i also have a netduino 2 there i connect to Analog 4 and 5?

that is correct ?

hi did you find any time :-)

It is a LiquidCrystal_I2C

Can you also help me with the resistors and the connections

no one who can help me ?

thanks all for your answers.

i think i have to start from the beginning.

How do i connect the bus ? Which resistors do i need ? and can give someone me some example code to test if a can connect / communicatie with a slave ?

       OutputPort op = new OutputPort(Pins.GPIO_PIN_SDA, true);
            bool noton=false;

            while (true)
            {
                noton=!noton;
                op.Write(noton);
                Thread.Sleep(200);
            }

Hi Chris

i have a netduino 2 plus connected to SDA/SCL and one netduino 2 connected to A4/A5

The resistors are 4k7.

I another thread you where talking about testing with a led. I tried that also but maybe i did something but the led never turns on.

Pin 4 -> resistor 150 Ohm -> led -> gnd  , i already turned the led from positive to negative but no result.

this is the code

Hi

i have a LCD display with I2C.

I tried for a few days now, but total no communication.

Is there a piece of sample code to test I2c ?  Maybe ask the device adresses on the bus or something

thanks Frank

that is 5v? when i measure 4,23 Volt.

When measuring without any connection to the netduino the voltage is 4.68 volt.

ok thanks. I will wait for your testing