Picture of Make your own smart watch

This document is also translated in Polish(by Sebastian), Korean language.

Most IT companies participate in the race to grab people’s wrist. A smart watch becomes the most significant item in a wearable device category. You can easily find this mood in this link, there are tons of smart watches.

But here is a simple way to evaluate smart watch’s future on your own. Make it! With Arduino micro-processor and Android, I made a simple smart watch and named it “Retro Watch“. You can do this too!

Retro Watch is an open source project to let you make a smart watch based on Arduino and Android. This text explains about modules, blueprints, how to install and use the Arduino and the Android source codes step by step.

Release note
Updated (2015.01.12) : RetroWatch supports u8glib. Now you can use various kind of OLED(or else) as you want and it consumes less memory(RAM). Instead it’s liitle slow at screen refresh. You can find updated sources at GitHub.

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Step 1: Overall Structure

Picture of Overall Structure

RetroWatch is a simple system that is used a hardware platform called Arduino, which is intended for artists, designers, and hobbyst, and an Android app. The overall structure is in the picture above.

Imagine a very small computer that you can wear on your wrist. Arduino board is a micro-processor and a storage, and there’s only one input method : a button. Bluetooth is to communicate with other devices, and the battery would be necessary for power. I’ll install an Android app for collecting or editing various RSS and system information and for notification on the Android device.

Step 2: Preparing for RetroWatch

Picture of Preparing for RetroWatch

You need to prepare modules as small as possible to wear the watch on your wrist. There may be tons of variations, but I chose parts that are commonly used and inexpensive.


Hardware parts for smart watch

Arduino micro-controller

I chose the smallest Arduino, Pro mini. Arduino Pro mini is a light version of UNO R3. It doesn’t have a USB interface chip in order to reduce the price and the size. There are two version depending on the operating voltage(3.3v/5v). And I used a 3.3v version, because the bluetooth and display that are connected with the board support 3.3v and the board goes well with the 3.7v LiPo battery. It runs at 8MHz and a 5v version at 16MHz, but 8MHz is enough. Overall, all you need to prepare are Arduino Pro Mini 3.3v and USB to UART module.

The main chip of the board, ATmega328, has only 2KBytes RAM, but ATmega128 has just 1KBytes, which is very limited to run my system. Most boards have ATmega328, but you have to make sure.


One of most common bluetooth modules that you can get are HC-06 main module and the one with interface base board. The latter one has a reset button, the status LED, and it supports both operation voltage(3,3v/5v), so this one is more convenient but the size is rather big, the LED, which is not quite necessary drains the battery and a little more expensive. So I used a HC-06 without the interface board.

To make a SMART WATCH, it would be necessary to find a small, low-power display. I’d given lots of thoughts, then I chose -.96’’ OLED Display. There are various sizes of the displays(0.96’’, 1.3’’, etc), it works on low-power, English font and the image out available, and it supports I2C, SPI, which makes easy to connect with Arduino.

<strong>Be careful at selecting a display!!</strong> I used an 128×64 OLED which is using I2C and SSD1306 driver chip. If you are using different one, you may need to use different graphic libraries and modify arduino source code.

Updated (2015.01.12) : RetroWatch supports u8glib. Now you can use various kind of OLED(or else). Check supported devices at this link.

I use LiPo(Lithum-Polymer) battery in this project. 1-cell LiPo battery flows out current in 3.7v, which works perfectly with Arduino Pro mini, and there are many kind of batteries in terms of the size and the capacity. The most ideal battery depends on what size of watch you want to make. I recommend the battery with protection circuit(overcharging, over-discharging safe), and it’s better if it has a removable socket. It might helpful for you if you get a female socket and USB or DC adaptor recharger.

You need wires, soldering iron, a switch and 10K ohm resistance(for a button), and a batter jack. It would be helpful for you to prepare the assembly manual.

Preparing for Android
Android v.4.3 supports the service that is used to get notification information from an app. So RetroWatch app is based on Android v.4.3 to enable notification service. For users who don’t use Android v.4.3 yet, the app without this function is released also. You can download the sources at GitHub, or download the app from Google Play Store. (Search with “RetroWatch” or “RetroWatch LE“)

Step 3: Assembling the watch

Picture of Assembling the watch

Folks who are accustomed to handling Arduino or physical computing would proceed this procedure, but I recommend the others not to assemble Arduino Pro mini board first, but try to make the watch with the board that is easy to connect and use like UNO board. The assembly structure for RetroWatch is here.

# Bluetooth-> Arduino :

  • VCC -> 3.3V
  • GND -> GND
  • TX -> D2
  • RX -> D3

# OLED -> Arduino :

  • GND -> GND
  • VCC -> VCC
  • SDA -> A4(the analog 4th pin)
  • SCL -> A5(the analog 5th pin),

If your display has SPI interface, refer to the link. In case of 7pin SPI OLED, connect like below.

  • D1 : MOSI - Arduino D11 (MOSI)
  • D2 : MISO - Arduino D12 (MISO) : this pin is optional.
  • D0 : CLK - Arduino D13 (SCK)
  • DC : DC (Data Command) - Arduino D8 (or else)
  • CS : CS (Chip select) - Arduino D10 (SS)
  • RES : RESET - Arduino D9 (or else)

# Button :

You may connect with a button which is small enough for the smart watch and a 10k-ohm resistance. Refer to the picture attached.

# Battery : You can simply connect battery by connecting (+) -> RAW, GND -> GND. You need to put (+) line to RAW pin in case you use any sort of external power supply, such as an external battery, on Arduino Pro mini board. Otherwise, it can damage the board.

# USB to UART module -> Arduino :

  • 3.3V -> VCC
  • TXD -> RXD
  • RXD -> TXD
  • GND -> GND

Step 4: Compile Arduino source for watch and upload.

Picture of Compile Arduino source for watch and upload.

You can download RetroWatch Arduino source on the source tab on the GitHub.

GitHub – RetroWatch project page

And you need to do something before you complie the source code.


# Install graphics driver
You need a graphic library to draw images, shapes, fonts on the OLED. In order to use it, you must install Adafruit_SSD1306, Adafruit-GFX-Library.

(According to your development environment, Adafruit library conflicts with Robot_xxx library. In this case, backup and delete Robot_xxx libraries from arduino library folder.)

WARNING: If you are using an OLED with SH1106 driver, use Adafruit_SH1106 driver at below link. Korean user Wonho made this based on Adafruit_SSD1306 driver.

In this case you must modify codes like below.

#include <Adafruit_SH1106.h>

SoftwareSerial BTSerial(9, 8); // Bluetooth TX, RX connection
int buttonPin = 5;  // Button pin 
display.begin(SSD1306_SWITCHCAPVCC, 0x3C); // OLED I2C address. Use your own settings

Updated (2015.01.12) : RetroWatch supports u8glib. If you wish to use various display, use u8glib instead. U8glib is more easy to use, consumes less memory(RAM) and supports various display. In this case download and install u8glib at official homepage.

# Copying the bitmap image header

You must copy the header file that contains bitmap images to load and use them. You should copy bitmap.h in RetroWatchArduino folder to /Arduino install folder/Arduino/hardware/libraries/RetroWatch. If there’s no such folder, simply make it.

# Modifying the source

Open Arduino IDE and load RetroWtchArduino.ino. Next, set pin numbers that you used when you connect the watch. It’s not necessary to modify if you use Arduino pins that are used in this instruction. But if you didn’t, you need to modify the source codes below.

SoftwareSerialBTSerial(2,3); // Input your TX, RX pin numbers

int buttonPin = 5; // Input your button pin number

display.begin(SSD1306_SWITCHCAPVCC, 0x3D); // Replace Ox3D with your I2C address

Updated (2015.01.12) : If you are using u8glib, load RetroWatchArduino_u8glib.ino file. And check below codes.

U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_NONE|U8G_I2C_OPT_DEV_0); // change this line according to your display
SoftwareSerialBTSerial(2,3); // Input your TX, RX pin numbers

int buttonPin = 5; // Input your button pin number

Updated (2015.04.21) : WARNING!!! If you are using OLED's reset pin and Adafruit graphic library, connect reset pin to arduino's D8. Or change reset pin definition in sketch.

#define OLED_RESET 8

Adafruit_SSD1306 display(OLED_RESET);

And make sure that this pin definition is not duplicated with your BT or button.

Updated (2015.01.22) : RetroWatch supports SPI OLED. I've updated at GitHub.

# Compile / Upload

If you follow the instruction well, you need to compile the source code. If this procedure fails, you have to check the error message and what went wrong so far.

If upload is completed, the RetroWatch Arduino logo and the Adafruit logo(the OLED manufacturer) have to be display on the OLED. After the logo phase passes and time shows up “00:00″, the initialization perfectly succeeds.

Now, it’s time to check the Bluetooth. Turn on the Bluetooth on your phone(Setting > Bluetooth). Your phone starts to search Bluetooth devices nearby, and the Bluetooth module should show. Once the Bluetooth module shows, you may proceed the pairing phase, and the two devices connect after putting 4-digit password (in my case, default 1234).

Step 5: Android app install & source download

Picture of Android app install & source download

It’s too big to demostrate how to compile and modify the android source. FYI, check /RetroWatch_Android/RetroWatch folder in the source downloaded from GitHub. I registered this app to Play Store, so go download it(search ‘RetroWatch’ or 'RetroWatch LE').

Follow the instruction as below and check the operation of RetroWatch.

If you install the app, turn on the bluetooth first(Setting > Bluetooth) and pair with the module. Next, start RetroWatch app. Choose the second menu(Notification access) on the top and grant RetroWatch the authorization for Notification. Choose the first menu(Choose the device) in the action bar and select the Arduino board that is already paired. If you can’t find it, check the power and the bluetooth module. Or choose ‘device scan’ menu to scan manually.

If the connection is succeeded, you may see “Connected” in connectivity display area at the bottom. Touch the action bar menu(…) and choose ‘Data transfer to Watch’. This menu transfer the data to display time and messages by Bluetooth. If the Bluetooth module works fine with the Arduino board, time information changes to current time. The Bluetooth connection is OK, but time doesn’t display, check the connection between TX, RX. Now, it’s time to have fun with MY OWN SMART WATCH!!! Pictures show the progress so far.

Step 6: RetroWatch Arduino

Picture of RetroWatch Arduino

RetroWatch changes mode in a circle as below.

Initial display:
The phase which the logo shows up when the watch boots.

Clock display:
The basic display which tells you time. You can change the style of the clock in the Android app. Analog, Digital, Mixed styles are supported so far. If you push the button, the display changes to the Emergency message display. It changes to the idle mode in case there’s no data update for 10 minutes.

Emergency message display:
The display that shows when users push the button in the watch display or a new emergency message is updated. If users push the button again or 10 seconds passes, the next message is shown. The display changes to a the normal message display after every emergency message shows.

Normal message display:
The display that shows after emergency message ends or users push the button. The next message shows up when users push the botton or after 5 seconds. The display changes to the clock when the last message shows.

Idle display:
The display that is shown if there’s no data push during 10 minutes. It displays Indicator and time(hh:mm) the display update interval changes to run at minimum power consumption. If you push the button or get a new message, the display changes to the clock display.

RetroWatch module has these features.

Three emergency messages can be stored. The message that the watch is already received is deleted if the messages are over 3. It can’t store lots of data due to memory shortage(2KB RAM).

Normal message stores up to 7. Like emergency messages, the first messages are deleted when the received messages reach to the maximum.

You can change the clock style as you want. Or you can even make your own clock style by altering the source code.

There are 65 icons so the Android app can use them. You can also add your own icons.(need to compile Arduino code)

You can choose whether the indicator would be shown or not in the app.

The internal battery is 140mAh, so the battery time is about 7 hrs at a normal status. I guess the battery time would be longer if I fix the source code for battery save.

Step 7: RetroWatch Android app.

Picture of RetroWatch Android app.

The performance of RetroWatch itself is limited, but I prepared some features to show various of data. The biggest feature is filtering messages sent to the watch. And I put an RSS feed feature to use data from different kind of areas. Try each feature by switching 4 tabs.

Message list tab :

Messages are the information collected from the app. Every message is inactivated except for emergency messages. Inactivated messages are not sent. You can change the status by filtering. By touching each message, you can enable each message or messages from same package.

Filter setting tab:

The RetroWatch app controls every single information by filtering. You can add, fix, and delete filters in this tab. You can change strings of messages(ex. change language Korean -> English since it supports English only), delete messages not to show, or just activate them without a string modification.

RSS tab:

You can register and monitor RSS feeds. The watch can show lots of information by RSS feeds. For instance, if you add a weather RSS and modify strings to filter, you can receive the weather alarm from the watch!!! You can easily search RSS feeds from the web site which I made and add them to the app.(Sorry, it's written in Korean now)

Watch control tab:

You are able to alter styles of the app and watch. If you put your Gmail account here, unread messages are registered in a message list. You can change the clock style and time display indicator to show(Display interval is already set because of power saving, the change applies at interval).



The RetroWatch app collects three kinds of data.


A notification that is registered in the Andriod indicator bar. App uses the Notification service to collect notifications, only over Android 4.3 supports this feature. Please download RetroWatch LE app for other android version. LE app doesn’t have the notification collection feature.

System info:

The system info of the phone such as battery status, RF(LTE, 3G) connection status, WiFi status, recharging progress is collected in the watch. In addition, if you register a Gmail account, it counts unread e-mails.

RSS feed:

If you set RSS title and URL, it periodically read RSS data.


Here are the other minor features.

Messages are sent in two kinds – emergency message, normal message. But users cannot modify them. You can set icon that shows on the watch when it filters messages. You can use 65 icons. All information is updated to the watch every 30 minutes.The RetroWatch service runs in background even if you shut the app.

Need more details about how to use app? See this link: Retro Watch app quick guide.

Step 8: Packaging

Picture of Packaging

RetroWatch Android, Arduino module is done, and if there’s no problem to operate, you need to pack the watch. Make a package as you want.

RetroWatch Specifications:

  • Processor : ATmega328 – 3.3v(8MHz)
  • 32KB Flash (2KB is shared for Bootloader)
  • 2KB RAM
  • Size : Width x Height x Depth = 34mm x 32mm x 12mm (Not packaged)
  • Battery : LiPo 140mAh (idle time 6-7hrs, 1-2hrs for recharging)
  • Connecting with Android app
  • Supports notification, system info, RSS feed
  • Message filtering
  • Open source
  • Hard-case file for 3D printer -> Download here!!

Step 9: Working demo and epilogue

Picture of Working demo and epilogue

You can feel how fascinating and powerful the open source and the open hardware are through this project. The idea comes true even though you are not professional because hardware is getting inexpensive and numbers of people shares source codes and know-how. Let’s try!!!

You can see the working demo at: YouTube link.

More specific how-to document at : RetroWatch project

Download sources at : GitHub RetroWatch page

Retro Watch app quick guide

Hard-case file for 3D printer, awesome case Designed by Wonho (See the Step9 title picture)

RetroWatch Android is based on Apache license, RetroWatch Arduino follows GPL v3.0.

Special thanks to Chang-Han Jeon and Kyung-Rae Park. Jeon translated this text in English and Park made a case for RetroWatch with his 3D printer. Awesome one at title picture is designed by Wonho. You can get the 3D modeling files here. And find more at his blog.

If you wish to translate this document into other language, feel free to do it! After translation, just notify to me with your result and your name. I’ll update this document. And if you made you own watch, please share with me. (

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dharmik pater12 hours ago
Sir I am confused about this parts ?
Can u send me the detail about this parts where to buy ?
send details at my email

could you maybe post all the links of where you bought all the parts including the buttons? thanks

Sir I want to add a vibrator motor to this watch so that when a new call or message is received then vibration motor give alert.How can I do so and which part of the code I should alter?

GodsTale (author)  Bodhisattwa.Rakshak7 days ago

Add your code at below position:


voidprocessTransaction() {



// Add your code here (vibrate the motor)


// Add your code here (vibrate the motor)




Aditya N G9 days ago

Thank you for the amazing project!!! I will be making it in about a week!!

GodsTale (author)  Aditya N G7 days ago

I'm expecting your work!! Do not forget to send me a picture of your watch

can i use android 4.2.2? please tell me i can i wanna make this so bad!

GodsTale (author)  tuur.vanboxtel7 days ago

Yes but use RetroWatch LE app instead.

Kevin jacob18 days ago

sir , when i verify the code it says U8GLIB_SSD1306_128*64 does not name a type

GodsTale (author)  Kevin jacob16 days ago

Did you install the U8glib?? Refer below link

Kevin jacob18 days ago

sir i am kevin jacob20002 but using another account so plz dont get confused with the first comment.

Kevin jacob18 days ago

sir i have done what u said but it doesnt seem to work plz help me out.

phankspp121 month ago

first of all thanks for sharing such an amazing project with us. I tried this project with arduino uno and it works perfectly fine. but with arduino pro mini it does not work.only startup screen shows up, it does not get update with time. i have used

RetroWatchArduino_spi_no_button code for this. pls help me out!!

GodsTale (author)  phankspp121 month ago

Connection between bt and phone is successful? If so, I think it's the matter of BT wiring. Check the wiring and BT initalization code.

SoftwareSerial BTSerial(2, 3); // HC-06's TX, RX

i made it but when i tested it with the phone it would work to display time then when you got a call it would scroll thew the battery and stuff then just stay on time and never scroll thu it again then all calls after that doesn't show up then the phone heated up is there a way to make it scroll thew every 5 sec or so and show calls after the first one? or is it just broke?

Thanks for your support Gods Tale,

problem for not updating time was with this


I had reduced it to 4800 and its works perfectly fine with it!!

Thabks for sharing amazing project with us!!

how can I get whatsapp message alert on retro watch?
GodsTale (author)  Bodhisattwa.Rakshak1 month ago

At first you need Android v4.3 or over. Touch the 'i' button on right-top corner and set notification access permission. Now make an whatsapp notification by any way you can do.

After whatsapp notification pop up you can see the notification at RetroWatch's message tab. Touch it and enable it!!

schnun1 month ago

I am having a strange issue I guess. I made the watch with a 1.3 SPI Oled

and it worked. When I get a message I see an exclamation mark (!) on

the Display so I know something new was received.

But now I made a smaller one with an 0.96 I2C (Heltec) and it works

fine so far, but I do not see any nos. showing a new message nor

an exclamation mark. I am using the correct U8glib lib with the button.

When I install the LE App (I am using Android 4.4.2) I see an exclamation

mark, but of course I want to use the "newer" app to see all message, but

with this I don't get a message notification. Has this something to do with

the app or my android Version ? Any ideas what the problem is there ?

Thanks very much,


GodsTale (author)  schnun1 month ago

RetroWatch app catches notifications from android framework but RetroWatch LE doesn't. RetoWatch LE only gather system message and send it as emergency message (showing on arduino as exclamation mark).

If you are using Android v4.3 or over, use RetroWatch app. And set the catched message enable. Most of messages are treated as normal message (showing as chat mark). You can see the normal messages by clicking the button on arduino.

schnun GodsTale1 month ago
Thanks for the message.
It does not work with version 1.0.7
but I found yor older Version 1.0.6
and with this it works perfect with
Android 4.4.2 ! I get all message
notifications. Maybe a little help
for all the others with the same problem.
Thanks godstale and when I have
my watch ready, I plan to make it
with Aluminum housing, I will provide the
CAD files.
GodsTale (author)  schnun1 month ago

Thank you for the report. Please show me your works when you're done!!

GodsTale (author) 1 month ago

WARNING!!! If you are using reset pin and Adafruit graphic library, connect reset pin to arduino's D8. Or change reset pin definition in sketch.

#define OLED_RESET 8

Adafruit_SSD1306 display(OLED_RESET);

And make sure that this pin definition is not duplicated with your BT or button.

KennethS51 month ago

I am using the Arduino 1.0.5 IDE for Mac. I have all of the pins connected the way that this tutorial says they should be. I am using SPI. I currently do not have a 10k Ohm resistor, so I am using the no_button versions of code. I have tried the RetroWatchArduino_u8glib_spi_no_button and the RetroWatchArduino_spi_no_button. I have all of the proper libraries installed, and I am not getting any errors while uploading. My problem is that when I boot up my Arduino, the OLED doesn't show anything. It stays black.

GodsTale (author)  KennethS51 month ago

If you don't see anything on display, check the wiring of OLED and check the sketch, especially initialization part. In case of u8glib-spi version, display initializing codes are:

U8GLIB_SSD1306_128X64 u8g(13, 11, 10, 8); // SW SPI Com: SCK = 13, MOSI = 11, CS = 10, A0 = 8

You can use a button though you don't have a resistor. Connect button's leg to D5 and connect opposite leg to GND. And set INPUT_PULLUP at D5 initialization code.

pinMode(buttonPin, INPUT_PULLUP); // Defines button pin

zarg.patel1 month ago

Firstly, thank you for sharing such an amazing project with us. I tried this out, works almost perfect with UNO. However, do tell me how I can use the entire screen to display a message, because the logo takes up so much space that the name of sender doesn't display in the screen.
Now, with pro mini, u8glib codes, the OLED doesn't even boot up. I want to run this project on pro mini, please help me out.

GodsTale (author)  zarg.patel1 month ago

One more thing. If you are not using a button, be sure to use RetroWatchArduino_u8glib_no_button or RetroWatchArduino_u8glib_spi_no_button.

GodsTale (author)  zarg.patel1 month ago

Did you add a button to arduino D5? You can see the message screen by pressing button. If you want to customize display, edit below functions

drawStartUp(), drawEmergency(), drawMessage(), drawClock(), drawIdleClock()

About running on pro mini, check below things.

- I2C wiring

- OLED instance : change oled initialization below code according to your OLED

U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_NONE|U8G_I2C_OPT_DEV_0); // I2C / TWI

- check OLED with other source code (ex. example code in u8glib)

Hiu KingL9 months ago

how to solve it?

my version is arduino 1.5.7

In file included from RetroWatchArduino.ino:35:0:

bitmap.h:1269:43: error: variable 'bitmap_array' must be const in order to be put into read-only section by means of '__attribute__((progmem))'

PROGMEM const unsigned char* bitmap_array[] = {


RetroWatchArduino.ino:118:32: error: variable 'weekString' must be const in order to be put into read-only section by means of '__attribute__((progmem))'

RetroWatchArduino.ino:119:32: error: variable 'ampmString' must be const in order to be put into read-only section by means of '__attribute__((progmem))'

GodsTale (author)  Hiu KingL9 months ago

In front of all the lines in the errors just add 'const'. See the details in below link.

plz tell what to do GodsTale i m a beginner

GodsTale (author)  akshitubhangale2 months ago

Use arduino 1.0.x version. And use RetroWatchArduino_u8glib.ino source instead.

I tried using 1.0.x version it is showing the same error
GodsTale (author)  akshitubhangale1 month ago

I didn't solve it yet. I saw this error in 1.5.x IDE version but I didn't in 1.0.x.

Please refer below link.

In this article, user harold65's guide:

The compiler is more strict and requires a better definition of variables.
You have 3 options:

  1. Compile using Arduino 1.5
  2. Update the time library (can be found on the arduino site) to the latest version
  3. Remove DateStrings.cpp from the library. Solarmeter does not use this (but other projects might)

sir, can you plz tell me where to add 'const'?

before weekstring, amapm etc

Hello sir,

i completed all the work ,but i cnt send data from retro app to watch,i think i did smting wrong,i checked bluetooth it connected,i check txd,rxd of bluetooth but i didnt get any notifications,pls sir get me solution for ths

sir did u face this kind of error?

Arduino: 1.6.2 (Windows 8.1), Board: "Arduino Pro or Pro Mini, ATmega328 (5V, 16 MHz)"

In file included from RetroWatchArduino_u8glib_spi.ino:32:0:

bitmap.h:1269:43: error: variable 'bitmap_array' must be const in order to be put into read-only section by means of '__attribute__((progmem))'

PROGMEM const unsigned char* bitmap_array[] = {


RetroWatchArduino_u8glib_spi.ino:123:32: error: variable 'weekString' must be const in order to be put into read-only section by means of '__attribute__((progmem))'

RetroWatchArduino_u8glib_spi.ino:124:32: error: variable 'ampmString' must be const in order to be put into read-only section by means of '__attribute__((progmem))'

RetroWatchArduino_u8glib_spi.ino:161:30: error: variable 'strIntro' must be const in order to be put into read-only section by means of '__attribute__((progmem))'

Error compiling.

This report would have more information with

"Show verbose output during compilation"

enabled in File > Preferences.

thank you

Write 'const' (without the commas) before the word weekstring, ampmstring and strintro in your code.

GodsTale (author)  akshitubhangale1 month ago

Use arduino 1.0.x version. And use RetroWatchArduino_u8glib.ino source instead.

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