Hi all,just a short update of my findings:Today I received another blue LCD display; this time I bought a Sainsmart 1602 incl. an I2C adapter mounted already on the backside.My tests (IDE 1.6.7 & NewLiquidCrystal 1.3.4 library) showed the following results:- Sainsmart I2C adapter comes with the 0x27 address (at least in my case)- it works out of the box without having to add the "backlight();" command after each lcd.print command- the I2C adapter is operating with a Philips PCF8574AT chip- ID of this Philips chip is: "ID knM00503"- alternative I2C adapter with same blue 1602 LCD display comes with 0x3F address- there is no manufacturer listed on the PCB; the only identification is A0 A1 A2 (LCD version 1, see this.)- in this case I needed to insert my workaround command "backlight();" after each lcd.print .. line- the adapter is also driven by a Philips PCF8574AT chip- ID of this Philips chip is: "ID knM96183"Maybe this helps those who have a similar problem displaying text on the LCDs.Raimund
The "A0 A1 A2" module was a separate buy to add the I2C feature to my display.Sainsmart display came with the module mounted.
Hello everyoneI solved the problem.It is a silly I have done extensive experiments with Libraries but it did not change the result.( I get a blue screen with square without text) the issue was the soldering. I did not solder my module pins to the LCD.It seams that some pin was not touching the micro strip on the lcd board. But now it works as it should be.So everybody: solder your module and make sure that all pins are well connected to the micro-strip
Hi Vaclav>>You have been asked several times to verify the actual connection between the piggyback and the LCDAre you sure?? I don't see anyone asked me about this before.
Hello,I have went through this thread because I had the same problem with characters not displaying. I used the code from @rpt007 with no luck.The solution I found in the end was rather simple and I felt a bit dumb. I only had to turnthe potentiometer on the I2C module a little and the characters showed up.Hope it helps some of you,Adam
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