ESP8266 Community Forum

- Mon Apr 06, 2015 2:25 pm #13660

but interestingly enough it finds a device under all adresses even with nothing connected to the IO pins

Same with my code.
I recorded the signals with a logic analyser and they don't look like i2c.

- Tue Apr 07, 2015 9:29 pm #13823 I guess I'm struggling with the Arduino environment - thought I understood how to add libraries, etc.
But when I try to compile I get this

Code: Select allArduino: 1.6.1 (Windows 8.1), Board: "Generic ESP8266 board"

Build options changed, rebuilding all

Using library LiquidCrystal_I2C2004V1 in folder: D:\Users\Michael\Arduino\libraries\LiquidCrystal_I2C2004V1 (legacy)

Using library Wire in folder: D:\ESP8266\tools-utilites\arduino-1.6.1\hardware\esp8266com\esp8266\libraries\Wire



D:\ESP8266\tools-utilites\arduino-1.6.1/hardware/tools/esp8266/xtensa-lx106-elf/bin/xtensa-lx106-elf-g++ -D__ets__ -DICACHE_FLASH -ID:\ESP8266\tools-utilites\arduino-1.6.1/hardware/tools/esp8266/sdk//include -c -Os -mlongcalls -mtext-section-literals -fno-exceptions -fno-rtti -std=c++11 -MMD -DF_CPU=80000000L -DARDUINO=10601 -DARDUINO_ESP8266_ESP01 -DARDUINO_ARCH_ESP8266 -ID:\ESP8266\tools-utilites\arduino-1.6.1\hardware\esp8266com\esp8266\cores\esp8266 -ID:\ESP8266\tools-utilites\arduino-1.6.1\hardware\esp8266com\esp8266\variants\esp01 -ID:\Users\Michael\Arduino\libraries\LiquidCrystal_I2C2004V1 -ID:\ESP8266\tools-utilites\arduino-1.6.1\hardware\esp8266com\esp8266\libraries\Wire C:\Users\Michael\AppData\Local\Temp\build5076188384420751848.tmp\SerialLCD.cpp -o C:\Users\Michael\AppData\Local\Temp\build5076188384420751848.tmp\SerialLCD.cpp.o

SerialLCD.ino: In function 'void setup()':

SerialLCD.ino:19:13: error: no matching function for call to 'LiquidCrystal_I2C::begin()'

SerialLCD.ino:19:13: note: candidate is:

In file included from SerialLCD.ino:1:0:

D:\Users\Michael\Arduino\libraries\LiquidCrystal_I2C2004V1/LiquidCrystal_I2C.h:58:8: note: void LiquidCrystal_I2C::begin(uint8_t, uint8_t, uint8_t)

   void begin(uint8_t cols, uint8_t rows, uint8_t charsize = LCD_5x8DOTS );

        ^

D:\Users\Michael\Arduino\libraries\LiquidCrystal_I2C2004V1/LiquidCrystal_I2C.h:58:8: note:   candidate expects 3 arguments, 0 provided

Error compiling.

I got the specified library, unzipped and renamed it and put it in my Arduino/library folder - the new folder is named "LiquidCrystal_I2C" and all the files seem to be there. liquidCrystal_I2c.h is there, etc.

And the library and it's examples show up in the Arduino Files/Examples list.

As a sanity check I loaded a previous mqtt pub/sub project and it builds fine.

It's bound to be something stupid - any suggestions?

- Tue Apr 07, 2015 9:43 pm #13824 Interesting - I loaded in the "hello world" project which I had originally used to make sure this Sainsmart 4x20 LCD worked using an Arduino Uno.

I put in the conditional to assign the wire pins and lo and behold it compiles and works. It also uses LiquidCrystal_I2C library but uses "lcd.init() instead of "lcd.begin"

I put "lcd.init" in place of lcd.begin in your code and it too now builds.

Maybe there are different versions of the library lurking in my folders?

- Wed Apr 08, 2015 12:12 pm #13884 Here's some pics of my ESP clock project which uses your I2C display and NIST date/time examples rolled into one -

IMG_2158.JPG

IMG_2162.JPG

IMG_2164.JPG

I used an ESP-201, I like them because they're cheap and fairly easy to work with with a non-PC type of project. Also used a 1117 voltage regulator for the ESP 3.3v, and a SainSmart 4x20 I2C LCD display. And some hot glue!
I'm totally useless with enclosures and making a nice finished good looking project.
If anyone has any sources for plastic or acrylic enclosures for little projects like these please let me know.

The ESP-Arduino development environment is sure nice to work in once the little nit picky things of getting everything set up correctly are finished.

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