16x2 LCD i2c sketch

Question

Hello all,

I have started on my automatic Chicken coop door project. Woo Hoo!

I had no issues with loading the Arduino files, I had no issues setting up my RTC and I set the time.

This is a big step for this newbie. LOL I got a 16x2 LCD with a I2c piggyback. I am having a real arduous

time trying to find the port code so I can upload my info.

Question 1:

Is there a way to clear all the uploads you have made to the Uno? I think I made allot of unnecessary uploads.

2.) I have the PCF8574T chip on my UXCELL 5v display. I have power and the first row is just solid white squares.

I have adjusted the contrast but I see no letters. I have uploaded the i2C scanner but all it displays is Searching.......

on the read out.

3.) Does anybody have a clue what I need to do because I am lost. With a 5v source I wouldn't think I need any resistors.

Any help would be greatly appreciated.

FYI, If you want to run your Uno on 12v solar power, just connect it to the, "Vin" port. That converts your 12 v to 5v.

FYI. A L298N motor controller CAN run 2 separate drill motors.

Thank for all your help so far.

the-dubster · Accepted Answer

Unless I'm reading this wrong, to clear previous sketches, upload the following null sketch. void setup() {} void loop() {} (info from here ) I was under the impression that each sketch you load to flash memory cleared the previous sketch, so I don't know if you even need to do this (unless you're just clearing it for clearing it's sake, although it still has the null sketch loaded . . . . ) With regards the LCD, I have this one, it also uses I2C interface, there is a link on the right of the page for software. That may help. Found this too . . . According to what I've read, the grove item needs no pull up resistors, but there is some more info at the bottom of that page too. Of course, if the grove item hasn't got the same driver chipset as yours then I may just be talking out of my posterior (but I'm even more of a noob as my Uno is still in it's box . . . . . . . . ) As for the rest, `i'm out until I figure stuff out myself!