Re: I2c Help

Question

Hi DJ,

In your i2c help, you mentioned that the address is 7 bits correct me if i'm wrong but if you've got bit 0-7 then isn't it 8 bits?

Let me explain:

bit 0 - 1 bit bit 1 - 1 bit bit 2 - 1 bit bit 3 - 1 bit bit 4 - 1 bit bit 5 - 1 bit bit 6 - 1 bit bit 7 - 1 bit

You see? in total, you've got 8 bits now.

Edit: wait i'm confused blush please delete this thread.....

DJ Sures · Answer

Hahahaha. well, you'll be able to find some i2c in here: https://synthiam.com/Community/Questions/322

Bookmaker · Answer

DJ, Did you ever get a chance to mess around with the i2c LCD. Mine just sits there being blue. "Hello world" would be awsome.

DJ Sures · Answer

I tried, lots. But those lcd's have zero documentation. Without documentation, i'm shooting in the dark. There is a combination of hundreds of addresses and commands to guess from. Thousands actually. I know why they're so cheap now!

Niek · Answer

@DJ I found this arduino code:
 #include #include LiquidCrystal_I2C lcd(0x27,16,2); //set the LCD address to 0x27 for a 16 chars and 2 line display void setup() { lcd.init(); lcd.backlight(); lcd.setCursor(0, 0); lcd.print("hello world"); lcd.setCursor(0, 1); lcd.print("hello world 2"); }

I bet you will find out how to do it if you decompile the LiquidCrystal library. Also @Bookmaker what LCD do you have?

DJ Sures · Answer

I've looked at the library. We've tried the 0x27 address. The issue is these no-name i2c lcd's have no documentation so we don't even know what address they are, or if they've even compatible with that library.

Niek · Answer

You could try with an arduino first, i'm afraid to ask, but do you have one laying around?

Bookmaker · Answer

I looked in the turorials and don't see anything on how to program the Serial ones. Are they ease for a none nerd like me? I want to replace the i2c one and get the LCD up and running. Iyron, you are welcome to my old one.

Bookmaker · Answer

I may have found the solution. i2c LCD forum  It states some ways down the they shipped the wrong library with the LCD and they give a url for the correct one. Naturly I don't have the vaguest idea what they are talking about however you may. correct library

Niek · Answer

@Bookmaker Yes, serial LCDs are so much easier, i have a sparkfun one that i got up and running in less than 10mins. Anyways, Good luck with the library you found! If you need any help, hit me up.

Bookmaker · Answer

Lyron, I don't know anything about i2c much less the library. May be DJ can give us a hand here?

orwnic82 · Answer

@Bookmaker LINK:I2C SCL : Clock SDA : Data clock is used to notify which device is going to be master in order to ship data across the I2C bus also to notify data: 1's and 0's.

Niek

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