Arduino - How to use U8g2 library to show graphic & UTF8 characters for monochrome displays

In order to use the newly purchased 0.96" OLED SD1306 display, I studied the u8g2 library and made this video to share with you on how to use U8g2 library with monochrome display. In the video, I also included a section on how to use the free 5000+ traditional Chinese font created by Mr. Yang. The file is free for anyone to use. Really appreciated what he did for Arduino community! For those who do not have time to watch the entire video , here is the video timeline.

Video Timeline:

00:22 Install u8g2 01:04 Open PrintUTF8 example 02:00 Define display used 02:23 Explain display naming rules 04:13 Uncomment the line selected 04:33 Explain the code 04:42 enableUTF8Print() for symbol and Chinese 05:14 u8g2 supported font list 06:23 display location setCursor(X,Y) 07:05 Upload the sketch & show characters 07:23 Can't overwrite characters! 08:08 Char overwrite solution 08:37 OledOverlayPrint() function 09:06 Use OledOverlayPrint() in code 10:08 Use Open Iconic Fonts 11:29 Display cloud symbol 11:52 \u with number to show cloud 13:02 Change fonts for different lines 14:34 Download 5000+ Chinese font 15:11 Install 5000+Chinese font 15:39 Test missing fonts again 16:42 Reminder of memory usage 17:45 End of tutorial

References:

U8g2 library: https://github.com/olikraus/u8g2 U8g2 plain font: https://github.com/olikraus/u8g2/wiki... U8g2 setCursor command: https://github.com/olikraus/u8g2/wiki... U8g2 iconic font: https://github.com/olikraus/u8g2/wiki... How to make your own font: https://blog.jmaker.com.tw/chinese_oled/ MQTT & IoT Integration FB group: https://www.facebook.com/groups/36360... Download 5000+ Chinese font: https://drive.google.com/drive/folder...

 END

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Arduino #27 AsyncWifimanager ElegantOTA ESP8266 (WiFi Password Mgnt + WiFi Firmware Update)

*** If you are using the ESP32, Please see this: ESP32

It would be great if every IoT device deployed with OTA capability with Wifimanager.  Then the IoT device would be able to change SSID & password without connecting the device to the computer to update SSID and password as well as FOTA at any time when you wanted.

In this tutorial, let’s combine ESPAsync_Wifimanager and AsyncElegantOTA into a code base to become a handy tool for future IoT projects! 

I have made WiFiManager & AsyncElegantOTA tutorial videos. If you don't know what they are and how they work for IoT projects, I strongly recommend you to watch these videos first.

This time, I used ESPAsync_WiFiManager library, it's because WiFiManager does not work with AsyncElegnatOTA together. We have to change to ESPAsync_WiFiManager.  The main reason for this is that AsnycWiFiManager is using Asynchronous technology. Which means it can accept connections from different sources at the same time. So, while WiFiManager is running on the device, the device can also be a FOTA server to allow firmware to be remotely updated!

        Watch these videos first, if haven't heard about these.

• WiFiManager : https://youtu.be/xO6SISq-DQ4
• AsyncElegantOTA: https://youtu.be/JDyDXBKLCq4

        GitHub Library:

• ESPAsync_WiFiManager:
• https://github.com/khoih-prog/ESPAsyn...
• AsyncElegantOTA:
• https://github.com/ayushsharma82/Asyn...

        Sample code:

• ESPAsync_WiFiManager minimal: https://github.com/khoih-prog/ESPAsyn...

For those of you do not have the time to watch the entire video, here is the Video Timeline 00:00 Project introduction 00:16 Arduino libraries used in this project 00:29 Short Wifimanager briefing (Check out my previous video) 00:59 Short AsyncElegnatOTA briefing (Check out my previous video) 01:34 Tutorial begin 02:04 Copy ESPAsyncWifimanager sample code to your editor 02:44 Check AsyncElegantOTA sample code 02:50 Start to merge the two libraries 05:16 Setup your IoT AP name 05:58 Copy AsyncElegantOTA code & modify 06:20 Modify server variables 07:05 What does webServer.on do? 07:35 Upload sketch 08:11 Test AsyncWifimanager and setup SSID & Password 09:10 Access ESP32 from browser 09:44 Access ESP32 OTA page The End.

Arduino #27 AsyncWifimanager ElegantOTA ESP32 (WiFi Password Mgnt. + WiFi Firmware Update)

*** If you are using the ESP8266, Please see this: ESP8266

It would be great if every IoT device deployed with OTA capability with Wifimanager.  Then the IoT device would be able to change SSID & password without connecting the device to the computer to update SSID and password as well as FOTA at any time when you wanted.

In this tutorial, let’s combine ESPAsync_Wifimanager and AsyncElegantOTA into a code base to become a handy tool for future IoT projects! 

I have made WiFiManager & AsyncElegantOTA tutorial videos. If you don't know what they are and how they work for IoT projects, I strongly recommend you to watch these videos first.

This time, I used ESPAsync_WiFiManager library, it's because WiFiManager does not work with AsyncElegnatOTA together. We have to change to ESPAsync_WiFiManager.  The main reason for this is that AsnycWiFiManager is using Asynchronous technology. Which means it can accept connections from different sources at the same time. So, while WiFiManager is running on the device, the device can also be a FOTA server to allow firmware to be remotely updated!

        Watch these videos first, if haven't heard about these.

• WiFiManager : https://youtu.be/xO6SISq-DQ4
• AsyncElegantOTA: https://youtu.be/JDyDXBKLCq4

        GitHub Library:

• ESPAsync_WiFiManager:
• https://github.com/khoih-prog/ESPAsyn...
• AsyncElegantOTA:
• https://github.com/ayushsharma82/Asyn...

        Sample code:

• ESPAsync_WiFiManager minimal: https://github.com/khoih-prog/ESPAsyn...

For those of you do not have the time to watch the entire video, here is the Video Timeline 00:00 Project introduction 00:16 Arduino libraries used in this project 00:29 Short Wifimanager briefing (Check out my previous video) 00:59 Short AsyncElegnatOTA briefing (Check out my previous video) 01:34 Tutorial begin 02:04 Copy ESPAsyncWifimanager sample code to your editor 02:44 Check AsyncElegantOTA sample code 02:50 Start to merge the two libraries 05:16 Setup your IoT AP name 05:58 Copy AsyncElegantOTA code & modify 06:20 Modify server variables 07:05 What does webServer.on do? 07:35 Upload sketch 08:11 Test AsyncWifimanager and setup SSID & Password 09:10 Access ESP32 from browser 09:44 Access ESP32 OTA page

The End.

Android control color RGB LED (Revised for ESP32)

ESP32 Source code on the bottom of this article! 

See the original complete project tutorial here: Android RGB LED Arduino Controller

In September 2014, I created this project with Arduino Mini Pro Mini and Android APP loved by so many readers!  There are more than 100,000 App downloads by now!  Since then, quite of few readers asked me how to change the sketch to be used on ESP32 with built-in Bluetooth.  Here it is!! 😀

Be aware that LED PWM pins used on ESP32 were completely different, since Arduino Mini Pro and ESP32 have different architectures. 

For ESP32, I used following pins:

• Pin 13 = Red
• Pin 12 = Green
• Pin 14 = Blue

Caution: ESP32 does not allow to use pin 6, 7, 8, 9, 10, 11 or it will crash and reboot. I tried...😂

Also, there is no analogWrite() function in ESP32, so I need to change analogWrite() to ledcWrite() with 

• Channel definition for PWM
• R channel = 0
• G channel = 1
• B channel = 2
• Setup PWM frequency: 5000
• Setup PWM resolution: 8 (8bit = 255 colors)

Then I need to setup LED with:

• ledcSetup( channel, frequency, resolution)

And then attach LED pins to channel

• ledcAttachPin(Pin, channel)

Then write to LED pins with

• ledcWrite( channel, value for resolution(0~255));

END

ESP8266/ESP32 AsyncElegantOTA Wi-Fi OTA

It's always troublesome to update firmware for your IoT projects? Tried Arduino BasicOTA examples, but never get it to work? Then you must try AsyncElegantOTA! It's very easy to use and I've succeed the first time I try it. 

For those of you do not have time to watch it all, here is the video timeline for your quick reference.

Video Timeline:

00:13 Tutorial summary 00:53 What's OTA & Why 01:25 Tutorial begin 01:36 Install AsyncElegantOTA library 02:32 Download ESPAsyncWebServer & ESPAsyncTCP 02:57 Ensure Arduino board is capable of OTA 03:41 Where to place downloaded libraries 04:09 Open sample AsyncElegantOTA sketch 04:52 Upload sketch 05:05 Open serial monitor to see ESP8266 IP address 05:36 Access to ESP8266 from browser 06:10 Update ESP8266 firmware from browser 06:31 Where to find .bin file in VS Code 06:54 How to create .bin file in Arduino IDE 08:16 OTA update ESP8266 firmware 09:01 Next video tutorial - How to combine ESP8266 project with AsyncElegantOTA library

Library URL:

• AsyncElegantOTA: https://github.com/ayushsharma82/AsyncElegantOTA

• ESPAsyncWebServer: https://github.com/me-no-dev/ESPAsyncWebServer

• ESPAsyncTCP: https://github.com/me-no-dev/ESPAsyncTCP

• For ESP32, you need the AsyncTCP library: https://github.com/me-no-dev/AsyncTCP