93C46 and 24C32 + Arduino NANO do not work

[Sergejs]

Hello,

With PCF8574 LCD 16 x 2 display Serial memory do not work. LCD just do not showing something. How to resolve this?

[mnfisher]

Hi Sergejs,

If you can post a demonstration Flowchart and details of what goes wrong then someone should be able to help.

Martin

[BenR]

Hello,

Yes we probably need to see your project to be able to help. Do you have pull up resistors in the SDA/SCL traces.

[medelec35]

Hi Sergejs.
You can try the I2C sniffer to make sure you have selected the correct address.
I can't point you to the correct version as you have not used a 9 or 10 post icon, posted your fcfx project file or stated what Flowcode version you are using which delays the help available.
The I2C sniffer will only work if you make the checks as Ben suggested and the working is correct.

[Sergejs]

There is my test but I don't know what addresses of devices must to be. I have Flowcode V9.

[Sergejs]

With PIC16 it don't show anything too. And 24C32 do not work too. It works only in simulator.

[Sergejs]

May be I need do not use SDA SCK for my LCD but use all ports of LCD display? But why working in simulator?

[medelec35]

I have add the 9 post icon to your initial post.
As you are using the PCF8574 LCD you only need to use VCC, GND, SDA & SCL of the piggyback daughter board.
With the PCF8574T and A0 to A2 open then the address will be 39
With the PCF8574AT and A0 to A2 open then the address will be 63
The I2C sniffer I posted a link to will send the address of any I2C components via the serial port.
Make sure your embedded hardware is working first by running a 1-sec flasher.
Then try to get the display sorted out first.
Can you confirm what pins you have wired the display to?

[Sergejs]

In Arduino Nano it is connected to d10 and d11 pins.

Is any software for how to find numbers of addresses of devices connected to MCU? Display work when not using EEPROM IC.