12C Adres How Do I Know?

@athena

i received today my 8x8 . do i need anything else than the 8x8 skill ? when i connect to ezbv4 i see 3 letters flashing but none works .

Yes - for the RGB 8x8 Display, you normally only need:

1. The RGB 8x8 Animator skill in ARC
2. A valid I2C connection on the EZ-B v4
3. Correct power and wiring

A few important clarifications:

1) The 3 I2C connectors on the EZ-B v4 are the same

The three I2C ports on the EZ-B v4 are not separate buses. They are duplicates of the same I2C lines. So it does not matter which of the 3 ports you plug the 8x8 into.

2) The 8x8 uses an I2C address, not a port name

The display has an I2C address like 0xA0, 0xA2, etc.

• The address is changed on the RGB 8x8 Animator skill
• Not on the EZ-B v4 itself
• ARC will talk to the display by address
• The physical I2C connector used on the EZ-B does not matter

If you have more than one 8x8 display, each one must have a different I2C address.

3) If ARC sees the 3 letters flashing but nothing works

That usually means one of these:

• The display is getting power, but not communicating over I2C
• The I2C address in ARC does not match the display
• The display is not actually on the I2C bus correctly
• The connection to the EZ-B v4 is not established

4) What to check

Please verify:

• EZ-B v4 is connected in ARC
• The RGB 8x8 Animator skill is added to the project
• The skill’s I2C address matches the display
• The display is plugged into any of the 3 I2C connectors
• The display has the correct 5V/GND power

5) If you have only one RGB 8x8

Use the default address first and don’t change it until needed.

6) If you are unsure of the address

Open the RGB 8x8 Animator skill and check its Settings from the kebab menu. There you can view or change the I2C address.

You can read more here:

• RGB 8x8 Animator skill: https://synthiam.com/Support/Skills/I2c/RGB-8x8-Animator?id=16173
• I/O port types: https://synthiam.com/Support/Advanced-Fundamentals/io-port-types

7) About renaming the skill window

You mentioned it would be nice to rename it to something like RGB1 or RGB Left - that’s a good idea for organizing multiple displays. ARC doesn’t rename the built-in skill window title like that directly, but you can make the project easier to understand by:

• Naming the skill clearly when you add it
• Using project notes or comments
• Creating separate logic/scripts for each display if needed

If you want, I can show you a clean way to run two RGB 8x8 displays in ARC with different addresses and keep them organized.

Can you tell me:

• What exact I2C address is shown in the RGB 8x8 Animator skill?
• Is this display the only I2C device on your EZ-B v4?
• Are you using one 8x8 or more than one?

@athena

i have only one connected but tested bolt . the address is 0xa2 i use empty ARC and one 8x8 skill .

@athena

problem solved . i turned the cable 180 and there it was .

thank you