Cannot find <LiquidCrystal_SoftI2C.h> library for 1602 LCD

Projects Programming
1

Hi everyone,

I'm working on a project with an Arduino Uno and a 1602 I2C LCD. I need to use software I2C to control the LCD on digital pins 9 (SDA) and 8 (SCL), as the standard I2C pins are already in use.

My sketch requires the <LiquidCrystal_SoftI2C.h> and <SoftI2CMaster.h> libraries. I was able to find and install SoftI2CMaster, but I can't find a working version of LiquidCrystal_SoftI2C.h in the Arduino Library Manager or via Google.

When I try to compile, I get this error:

fatal error: LiquidCrystal_SoftI2C.h: No such file or directory compilation terminated.

Here is my full code:

#include <SoftI2CMaster.h>
#include <LiquidCrystal_SoftI2C.h>

LiquidCrystal_SoftI2C mylcd(0x27,16,2,9,8);

float checkdistance_4_3() {
  digitalWrite(4, LOW);
  delayMicroseconds(2);
  digitalWrite(4, HIGH);
  delayMicroseconds(10);
  digitalWrite(4, LOW);
  float distance = pulseIn(3, HIGH) / 58.00;
  delay(10);
  return distance;
}

void setup(){
  mylcd.init();
  mylcd.backlight();
  pinMode(4, OUTPUT);
  pinMode(3, INPUT);
}

void loop(){
  mylcd.setCursor(0, 0);
  mylcd.print(String(checkdistance_4_3()) + String("  cm"));
  mylcd.setCursor(0, 1);
  mylcd.print("");
  mylcd.clear();
  delay(100);
}

Could anyone please help me find where to download the correct LiquidCrystal_SoftI2C.h library? Or, is there a better, more current library for controlling an I2C LCD on custom pins?

Thanks in advance for your help!

2

Welcome to the forum

As your topic does not relate directly to the installation or operation of the IDE it has been moved to the Programming category of the forum

3

Exactly which type of Uno board are you using ? On the classic board SDA is on pin A4 and SCL is on pin A5

4

thank you. I'm not used to here yet!

5

I use UNOR3. However, I only have to use the designated pins because there are situations where I have to run on a compatible board. It's too much to fix the hardware design! I've seen it run on the Internet with the same code as me a few times, but I couldn't find the library

1 Like
6

How hard did you look ?

7

yes , but it doesn't work...
for example, it doesn't have class LiquidCrystal_SoftI2C, so i changed name as LiquidCrystal_I2C! and i changed other things' name
But another problem occured. like this

      : : [SCLIN] "I" (SCL_IN), [SCLPIN] "I" (SCL_PIN));
                       ^~~~~~

so...I'm not sure if the library is right

thank you

8

oh ! I tried the example of that library and found it working. But I feel that the current code needs to be modified. I'll work on it well. I'm impressed with your kind effort. Thanks

9

Forget your code for now. Do the examples that come with the LiquidCrystal_SoftI2C compile OK

1 Like