Note : This article was written after project was partially completed, so i don’t have better images.
There are hundred’s of projects for building “Smart watch using arduino”, I have curated a list of better projects at end of this article. I didn’t plan to copy any of given projects but at end it turned out that world is a big place. So this blog post is my effort in developing “My smartwatch”.
Hardware :
- Arduino Pro mini
- Bluetooth module (HC-05)
- OLED Module (SSD1306)
- LiPo Battery (110 mAh)
- Thin copper wire, single strand if possible.
- FTDI Breakout board or any way to program Arduino pro mini.
- Micro USB female pins
- Membrane Tape
Tools :
- Soldering iron – along with soldering wire, flux, etc.
- 3d Printer/Good Crafting Skills to make a case
- Working brain ! (Recommended)
Software :
- Android Phone (BTTerm) /Linux System(minicom, rfcomm), Windows Phone, Windows *, Mac OS Users are on their own but you can search for “Bluetooth serial terminal”
- Arduino IDE
- Common Sense ! (Recommended)
The guide here is definitely not a step by step guide, it just tells the flow (an algorithm not code).
- Desolder pins in your OLED display. Yea, all header pins.. for noobs like me it’s a tough task.
- Desolder pins of HC-05/HC06 if it has, if you got module without header, skip
- Connect all GND, VCC pins of arduino, hc-05, oled Easy ?
- Solder oled pins SCL -> A5, SDA -> A4 to arduino.
- Solder hc-05 pins TX -> 10, RX -> 11 to pro mini.
- Then Solder VCC with a switch (Any you prefer) & to battery.
- Upload the code
- Connect to HC-05 using phone & send any data.
HC-05 Soldered
Oled, HC-05, ProMini Stacked.
Everything stacked Packed
Back View
Front View
Click here to watch working video.
Below is arduino code :
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#include "U8glib.h" U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_NO_ACK); // Display which does not send AC #include <SoftwareSerial.h> // software serial #1: RX = digital pin 10, TX = digital pin 11 SoftwareSerial bluetooth(10, 11); #define buflen 10 char str[buflen+1]; int strCount=0; // setup input buffer #define LINE_MAX 30 uint8_t line_buf[LINE_MAX] = "Booting..."; uint8_t line_pos = 0; // setup a text screen to support scrolling #define ROW_MAX 12 uint8_t screen[ROW_MAX][LINE_MAX]; uint8_t rows, cols; // line height, which matches the selected font (5x7) #define LINE_PIXEL_HEIGHT 7 // clear entire screen, called during setup void clear_screen(void) { uint8_t i, j; for( i = 0; i < ROW_MAX; i++ ) for( j = 0; j < LINE_MAX; j++ ) screen[i][j] = 0; } // append a line to the screen, scroll up void add_line_to_screen(void) { uint8_t i, j; for( j = 0; j < LINE_MAX; j++ ) for( i = 0; i < rows-1; i++ ) screen[i][j] = screen[i+1][j]; for( j = 0; j < LINE_MAX; j++ ) screen[rows-1][j] = line_buf[j]; } // U8GLIB draw procedure: output the screen void draw(void) { uint8_t i, y; // graphic commands to redraw the complete screen are placed here y = 0; // reference is the top left -1 position of the string y--; // correct the -1 position of the drawStr for( i = 0; i < rows; i++ ) { u8g.drawStr( 0, y, (char *)(screen[i])); y += u8g.getFontLineSpacing(); } } void exec_line(void) { // echo line to the serial monitor Serial.println((const char *)line_buf); // add the line to the screen add_line_to_screen(); // U8GLIB picture loop u8g.firstPage(); do { draw(); } while( u8g.nextPage() ); } // clear current input buffer void reset_line(void) { line_pos = 0; line_buf[line_pos] = '\0'; } // add a single character to the input buffer void char_to_line(uint8_t c) { line_buf[line_pos] = c; line_pos++; line_buf[line_pos] = '\0'; } void setup(void) { Serial.begin(9600); bluetooth.begin(9600); Serial.print("Hello"); // bluetooth.println("Hi"); // u8g.firstPage(); // u8g.drawStr( 0, 0, "Booting.."); // set font for the console window u8g.setFont(u8g_font_5x7); //u8g.setFont(u8g_font_9x15); // set upper left position for the string draw procedure u8g.setFontPosTop(); // calculate the number of rows for the display rows = u8g.getHeight() / u8g.getFontLineSpacing(); if ( rows > ROW_MAX ) rows = ROW_MAX; // estimate the number of columns for the display cols = u8g.getWidth() / u8g.getStrWidth("m"); if ( cols > LINE_MAX-1 ) cols = LINE_MAX-1; clear_screen(); // clear screen delay(1000); // do some delay exec_line(); // place the input buffer into the screen reset_line(); // clear input buffer } void loop(void) { // Keep reading from HC-05 and send to Arduino Serial Monitor if (bluetooth.available()){ char c = bluetooth.read(); Serial.write(c); // uint8_t c; if ( line_pos >= cols-1 ) { exec_line(); reset_line(); char_to_line(c); } else if ( c == '\n' ) { // ignore '\n' } else if ( c == '\r' ) { exec_line(); reset_line(); } else { char_to_line(c); } } if (Serial.available()) bluetooth.write(Serial.read()); } |
As told initially my build is not the best one, there are people with better electronics & better output check these :
http://www.instructables.com/id/Make-your-own-smart-watch/?ALLSTEP
http://makezine.com/projects/make-43/open-source-smartwatch/
http://www.tinkernut.com/portfolio/make-smartwatch-old-cell-phone-part-1/
http://oswatch.org/mkII_build_page_1.php
1 comment
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