Ive been using a regular LCD in my project but wanted to upgrade to OLED since its a pain to get the backlight voltage stable and am forever trimming the pot on the back of the LCD.
Anyway, other people in the comments are reporting the same issue as myself saying that the controller is a us2066, not ks0066.
Basically i get a blank screen, i dont think its a fault.
Do i need a different library or something?
Would i need to significantly rewrite the code to my project?
@nzoomed
Installation and Troubleshooting is for Problems with the Arduino itself NOT your project. It says so in the description of the section. Therefore I have moved your post here. Please be more careful where you post in future.
Sorry your right, it is the contrast. A friend of mine said he had similar issues.
I have a stable 5v power supply using an lm2596t buck converter but seems that temperature can affect it. I think the issue could be with the i2c board connected to the LCD. Either way i like these oled displays better if i can get them to work
Interesting. I cannot claim extensive experience using these displays, so have not noticed temperature problems, but have not heard others with that problem.
There are "extended temperature range" LCDs which require a greater (negative) contrast voltage, but these are not particularly common,
I dont know alot either, from whatni was told, the resistance can drift on the trimmer due to temperature changes. Anyway, i will monitor the voltages and see if it changes.
As far as this screen goes, i would be keen to get it to work. Anyone know much about the controller that it uses?
Exactly, if i have to replace the library, is ther anything else in the code i need to rewrite or can i simply replace the library and the existing code will treat it the same?
May I suggest that you acquire at least the basics of being code literate before you proceed with your project. Do a few examples in the IDE and read the code and try and see what is happening. Once you can do that then you might be at a stage where you can understand the help you are being given.
Well I tell A lie, I know about enough to turn on and off an LED and thats about it.
I know how to add libraries, etc, and have edited values in code to tweak things, and thats about where my skills end.
I think it would be good as a start just to connect this screen up to an arduino to see if i can get it to display something.
Im currently using the LiquidCrystal_I2C.h library for my LCD
I was hoping the routines in the library would be written the same or similar so that little to no code needs changing.
Edit:
Here is the sample code, I cant see in here what part initializes the pins on the arduino.
In the link here (GitHub - pedro11x/Arduino-US2066-OLED: wide.HK 1602 OLED Library)
it says that pins A4 and A5 are to be used.
Any help would be great, have currently uploaded this sketch, but nothing is showing.
The manufacturer provided me the datasheet here: http://surenoo.tech/download/03_SOL/0301_SOC/SOC1602F.pdf
I dont know if this is any use to anyone to see if this library is compatible or not.
/*
Example sketch
*/
#include "US2066.h"
US2066 OLED;
float digit; //Variable to hold sample temperature value
void setup()
{
Wire.begin();
OLED.init();
}
void loop()
{ char* buf;
//Printing, no cursor
OLED.print("hello");
//Progress bar!
for(int i=0;i<=100;i+=5){
OLED.bar(0, 6, 5, i);
delay(100);
}
delay(50);
//Printing in a particular place, by defining the row and column
OLED.print(0, 6, "world!");
delay(500);
//Seting a cursor position, from which to start writing
OLED.cursor(1, 0);
//Turning on the blinking cursor
OLED.blinkingCursor(HIGH);
delay(500);
//Printing one character at a time
animatedPrint("The US2066 lib");
delay(1000);
OLED.cursor(1, 0);
animatedPrint("Blinking cursor!");
delay(500);
OLED.cursor(1, 0);
animatedPrint("Setting contrast");
//Changing the contrast
for(uint8_t i =255;i>0;i-=15){
OLED.contrast(i);
delay(50);
}
delay(200);
for(uint8_t i =0;i<255;i+=15){
OLED.contrast(i);
delay(50);
}
delay(1500);
OLED.print(1,0," ");//clearing row 1
OLED.cursor(1,0);
animatedPrint("Going to sleep");
delay(100);
//Turning the display off
OLED.off();
delay(1000);
OLED.print(1,0," ");//clearing row 1
OLED.cursor(1,0);
OLED.print(1,0,"Waking up");
//Waking it up
OLED.on();
delay(10000);
OLED.clear();
OLED.home();
OLED.blinkingCursor(false);
}
void animatedPrint(String buf){
for(int i=0;buf[i];i++){
OLED.print(buf[i]);
delay(50);
}
}
There are other things to modify to the hardware as described in the notes of the linked github repository .....have you done that?? And suggest run the I2C scanner to ensure the LCD responds
Those mods are not applicable to my screen.
Those instructions apply to a screen that has multiple pins for a parallel interface that needs to be disabled.
The only connections on my screen are for sda and scl plus power
Edit:
Am trying to upload the sketch for i2c scanner to my arduino but get this error:
Yes those two pins carry the I2C signals.
Posting error messages as a screen dump is useless. The box on the right is for copying the whole error message, then you can post it in code tags in your reply.
// --------------------------------------
// i2c_scanner
//
// Version 1
// This program (or code that looks like it)
// can be found in many places.
// For example on the Arduino.cc forum.
// The original author is not know.
// Version 2, Juni 2012, Using Arduino 1.0.1
// Adapted to be as simple as possible by Arduino.cc user Krodal
// Version 3, Feb 26 2013
// V3 by louarnold
// Version 4, March 3, 2013, Using Arduino 1.0.3
// by Arduino.cc user Krodal.
// Changes by louarnold removed.
// Scanning addresses changed from 0...127 to 1...119,
// according to the i2c scanner by Nick Gammon
// https://www.gammon.com.au/forum/?id=10896
// Version 5, March 28, 2013
// As version 4, but address scans now to 127.
// A sensor seems to use address 120.
// Version 6, November 27, 2015.
// Added waiting for the Leonardo serial communication.
//
//
// This sketch tests the standard 7-bit addresses
// Devices with higher bit address might not be seen properly.
//
#include <Wire.h>
void setup()
{
Wire.begin();
Serial.begin(115200);
while (!Serial); // Leonardo: wait for serial monitor
Serial.println("\nI2C Scanner");
}
void loop()
{
byte error, address;
int nDevices;
Serial.println("Scanning...");
nDevices = 0;
for(address = 1; address < 127; address++ )
{
// The i2c_scanner uses the return value of
// the Write.endTransmisstion to see if
// a device did acknowledge to the address.
Wire.beginTransmission(address);
error = Wire.endTransmission();
if (error == 0)
{
Serial.print("I2C device found at address 0x");
if (address<16)
Serial.print("0");
Serial.print(address,HEX);
Serial.println(" !");
nDevices++;
}
else if (error==4)
{
Serial.print("Unknown error at address 0x");
if (address<16)
Serial.print("0");
Serial.println(address,HEX);
}
}
if (nDevices == 0)
Serial.println("No I2C devices found\n");
else
Serial.println("done\n");
delay(1000); // wait 5 seconds for next scan
}
Arduino: 1.8.16 (Windows 10), Board: "Arduino Uno"
sketch_feb11a:1:1: error: expected unqualified-id before '/' token
/ ---------------------------------------------------------------- /
^
In file included from K:\Desktop\i2c scan\sketch_feb11a\sketch_feb11a.ino:11:0:
C:\Program Files (x86)\Arduino\hardware\arduino\avr\libraries\Wire\src/Wire.h:86:8: error: 'TwoWire' does not name a type; did you mean 'TwoWire_h'?
extern TwoWire Wire;
^~~~~~~
TwoWire_h
K:\Desktop\i2c scan\sketch_feb11a\sketch_feb11a.ino: In function 'void setup()':
sketch_feb11a:15:3: error: 'Wire' was not declared in this scope
Wire.begin(); // Wire communication begin
^~~~
K:\Desktop\i2c scan\sketch_feb11a\sketch_feb11a.ino: In function 'void loop()':
sketch_feb11a:34:5: error: 'Wire' was not declared in this scope
Wire.beginTransmission(address);
^~~~
exit status 1
expected unqualified-id before '/' token
This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.
The code is below, I might try the code cherk has posted to see if i get any different results.
/ ---------------------------------------------------------------- /
// Arduino I2C Scanner
// Re-writed by Arbi Abdul Jabbaar
// Using Arduino IDE 1.8.7
// Using GY-87 module for the target
// Tested on 10 September 2019
// This sketch tests the standard 7-bit addresses
// Devices with higher bit address might not be seen properly.
/ ---------------------------------------------------------------- /
#include <Wire.h> //include Wire.h library
void setup()
{
Wire.begin(); // Wire communication begin
Serial.begin(9600); // The baudrate of Serial monitor is set in 9600
while (!Serial); // Waiting for Serial Monitor
Serial.println("\nI2C Scanner");
}
void loop()
{
byte error, address; //variable for error and I2C address
int nDevices;
Serial.println("Scanning...");
nDevices = 0;
for (address = 1; address < 127; address++ )
{
// The i2c_scanner uses the return value of
// the Write.endTransmisstion to see if
// a device did acknowledge to the address.
Wire.beginTransmission(address);
error = Wire.endTransmission();
if (error == 0)
{
Serial.print("I2C device found at address 0x");
if (address < 16)
Serial.print("0");
Serial.print(address, HEX);
Serial.println(" !");
nDevices++;
}
else if (error == 4)
{
Serial.print("Unknown error at address 0x");
if (address < 16)
Serial.print("0");
Serial.println(address, HEX);
}
}
if (nDevices == 0)
Serial.println("No I2C devices found\n");
else
Serial.println("done\n");
delay(5000); // wait 5 seconds for the next I2C scan
}
And suggest run the I2C scanner to ensure the LCD responds