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Topic: Two I2C lcd displays did not work together (Read 7364 times) previous topic - next topic

-Micky


Quote
I think the reason is the I2C interface. It seems that only one address is possible. 0x20. I will make some changes to the interface and see what happens.


What about your response in reply #2 "Yes, they have different addresses. I test this with a I2C scanner." ?

Have you dealt with any of the jumpers (solder blobs) on either of your Serial interface boards?

Have you considered the recommendations in reply #11?

Don
1. Solder blobs all closes is 0x20. Open, one, two or three is 0x21. Which blob is open doesn't matter. BUT: This happend only when I use both I2C interfaces.
2. If I use only one interface then all blobs gives 0x20. Setting or not setting the blobs does not matter too.
3. I think I try some modification with the interfaces because it has no stable address.


Micky  

floresta

Quote
1. Solder blobs all closes is 0x20. Open, one, two or three is 0x21. Which blob is open doesn't matter. BUT: This happend only when I use both I2C interfaces.
2. If I use only one interface then all blobs gives 0x20. Setting or not setting the blobs does not matter too.
3. I think I try some modification with the interfaces because it has no stable address.

It appears that you are not getting all of the solder removed so you are not effectively changing the address.

You really should go back to reply #11 and make sure that you can get each device functioning alone but with a different address for each.  Until you get that working you are probably wasting everyone's time.

Don

-Micky

#17
Apr 25, 2013, 11:48 pm Last Edit: Apr 25, 2013, 11:59 pm by -Micky Reason: 1
Ok, now I can use addresses from 0x20 to 0x27. I made some modifications on the pcb. First pic shows the original I2C interface and the second one my modifications. Without my modification there is only one address possible: 0x20.


Micky

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