An easy way to see the I2C addresses on the displays (or other I2C devices) is to load the I2C scanner sketch and look at the serial monitor. Nice little tutorial.
BLESS YOU! i have been working on getting a project going for weeks and now because of you, it's working! you explained it and I felt confident with the knowledge you imparted. it still didn't work, but because of my new found confidence, I decided to get a fresh copy of ssd1306.h. and everything began to work! THANK YOU! one note in the lines where you are doing the 'display2...display2...display2...display2...display2...' there's a line in there that says 'display1...' thought you'd like to know although you've probably had a zillion calls on it already. anyway, kudos and I'm going to subscribe twice - once for display1 and again for display2...
I suspect that flicker you’re seeing on your screen is because of the failed ack from the Oled after each message you send to it in the .display() method. This causes it to not be immediately ready for the next transaction. I had this problem too until I added some 4.7 K pull up resistors on the SDA and the SCK lines. I hope that helps.
I found a little mistake in the conversion from HEX to binary. Actually a misplacement of the addreses. 0x7A corresponds to 01111010 in binary and 0x78 is 01111000 in binary. So you have swaped them by mistake. Not a big problem, anyway, great tutorial!
Can use more than 2 if use SPI ones as each will have it's own CS line. OK... uses more pins but could use a port expander etc if pins are tight. Also find SPI ones have a faster SCK rate.
What is the maximum limit of Arduino mega handling oled screens i want ro use 30 oleds so how much current and power dissipation of the whole system would be? And are rgb oleds available
I got the sketch working, but can't get to 128 x 64 pixel mode, only 128 x 32 pixel mode. As I am weak with library editing, I could use some help there. I have Notepad++ and have edited libraries, but am having trouble with the "new" constructors. Thanks!
Open a file called Adafruit_ssd1306.H. notepad will be a fine editor. Look for these lines near the top of the file and make sure this line is not commented out. Make sure similar ones are commented out though. Save the file and restart the Arduino IDE. #define SSD1306_128_64
all kinds of issues with your free sketch, i'm a beginner but I compared your scrolling circles sketch with another simple sketch with dual display with only had text, combining the 2 and modifying your sketch I got the circles to scroll otherwise the circles did not jump to display 2 at all.
Awesome buddy, thanks. hey quick question, the screen i have have the resistor on the other address, and it made me wonder rather than using a blob of solder are u meant to move the resistor?
I used our code....and same wire connection as u do....but I am getting only display2 text displayed in both displays.....0x3d address not working....same oled displays used
You have resistor on back of the display where you change it's adress, if they are on same adress it will show same thing on both of them. Desolder it and solder to second pad on one of the displays.
Crazy Couple yes and no, the yes is all you need to do is find another display with a unique address, the no part is I've never been able to find one other than 0x 3 C and 0 x 3D
Thanks for the help. There is a typo in the code Display2.setTextSize(2); Display2.setTextColor(WHITE, BLACK); Display2.setCursor(0, 0); Display2.println("Display 2"); Display1.fillCircle(i - 127, 30, 10, 1); //
Sehr gute Darstellung und sehr lehrreich. Aber auf der Folie (Zeit 1:39) ist da nicht die Bit verdreht - was rechts ist gehört nach links und umgekehrt. Einfach die erste Zeile vertauschen!
I'm also trying to use your code, but I've got only one display on and it's flashing, with the circle at the start. I can swap them changing C with D in the code, and I2C scanner does show both devices. I have tried on Uno, Nano, different displays, but nothing is changing. Are you sure this code works?
@@SpectraLzz I had this issue, it seems the updated Adafruit library no longer works with this code. don't ask me why, still learning to use my Arduino. but if you change the library version to 1.2.7 it should work. it did for me at least. kris Kasprzak if you see this, might be worth throwing a note up on the video?
So great Kris! I am using this as a base for monitoring AC current...but 60Hz is low and doest fit the full wave on the 128x64. I am attempting to modify to "Zoom" out to see more waves...any tips?
I'm interested in connecting 5 displays in a single project. All 5 displays would show a different image which would fade in and out between 2 images... Is this possible using a single controller or am I forced to utilize more than one?
Possibly but may need different displays, MCU and library. The library used here creates a video buffer in memory the writes the buffer to the screen. Those little arduinos will probably not have enough memory for 5 displays. 2 is pushing it. A Teensy 3.2 has 256K of memory and should work just fine. Now for the displays....if I2C based, you will need to find 5 different addresses (depending on the lib) or use an i2c scanner to get each displays address--again it may be hard finding different addresses. If you move to SPI displays, display writing is controlled via a chip select pin. Depending on the controller you may need to use special pins for the unique chip selects. I feel this is possible by not with the code i'm showing here.
Forgive me for I am new to Arduino but could you use what you have done here to create a large screen and map the content across lots of screens to create one much larger screen of similar aspect ratio?
You could but you need to find displays that have programmable address. the ones I show here only have 2 settings, so if you wanted to use say 3 x 3 for 9 displays, these would not work. I'm not sure if any exist that have that much flexibility. If you need say 480 x 320, those displays exist or even 7 inch displays.
Yes you can but you will need to use seperate i2c buses or you can do clever external select swapping on spi. To use seperate i2c buses tou will have to have enough pins and modify the wire library to support pin asssignment or constantly swap pins in software. Or just write your own low level code
How many ports per display? drop 2 each(VCC, GND), these can be re-used among displays (power/watt restrict #) it seems you need 2(SCL, SDA) x 36 = 72 ports. You need to calculate also how much power(wattage = volt x amp ) each display consumes or get it from datasheet. Just try it and please post findings on INSTRUCTABLES. title: Max # of Displays that Arduino Can Run www.instructables.com
+LS this could be useful to you: #20 Tutorial: Multiple Devices on One Arduino I2C Bus ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-QQLfzlPGjjE.html
Is it realy not possible to do if i dont have a adress changer? I have a project to do for school and i need to know if 2 RB-TFT1.8 can work on a ESP32
If your displays are I2C then you may be able to scan the address of each device to see of they are different. If there is no hardware selection, I suspect they will be the same. If you need multiple displays use SPI type (ILI9341 drivers for example), SPI have a chip select pin for communicating to each display. You may be able to use a multiplexer chip to communicate to multiple SPI displays.
Not sure how you will distinguish one from the other. I've never seen programmable addresses. Also forget using an Arduino--not enough memory. Switch to a Teensy.
I have some without the address on the back but.....there are 2 zero ohm resistors with a common center and labeled r3+ r4+ r4-r3-. I am thinking these may change address? I am going to try it and check it with i2c scanner. I may blow it but hey, a few dollars : )
Well, I found a complete data sheet (I think on Adafruit.) It looks like r3, r4 and r8 are just used to select spi, I2C. Darn : ( .......The data sheet does show all the pins so I hope there will be a way to flash a new address to them? Here is link to advanced data sheet..... cdn-shop.adafruit.com/datasheets/SSD1306.pdf
@@KrisKasprzak One is set to 0x3C and the other is 0x3D. The text shows up correctly for display 1 and 2 but the little ball stays in display 1, looping around.
+jia chen, You can use dupont wires/jumpers fe/male to fe/male (f2f, m2m, "f2m" ), get all sets in 1 kit. duckduckgo.com/?q=+Dupont+Jumper&iax=images&ia=images v.ht/dupont And do this/these trick(s) : ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-eI3fxTH6f6I.htmlm29s
you can, watch the moving circle from disp1 to disp2 at the 0:03 mark. YOu just need to the do the math to reset the graphic item to 0 for disp2 when the graphic item hits the width limit of disp2
@@harshmudgil4140 I've seen 7" but are for Due and Megas. And since the plug right into the Mega i'm not sure you can have more that one. I seriously doubt an Uno could drive them very well--but even moving to the Mega will have the same challenges--connecting >1 display
I managed to get it working but couldn't get to 128 x 64 pixel mode, only 128 x 32 pixel mode, I edited the Adafruit_ssd1306.H library file and did what you told one of the users, leaving the line uncommented #define SSD1306_128_64 and it worked for me but now it only turns on one of the screens and the Arduino constantly restarts, please if you can help me I appreciate it.
Try putting a serial.println(“here”) in various places in your code try to see when it crashes. I suspect you’re trying to write or access an array value that is out of bounds.
@@KrisKasprzak Hello, thanks for your prompt response, I am using the same code that you published to do the tests, everything works until you edit the library and change the line you indicate, could it be the version of the library? which one are you using?
