Bangle js

some Features

• 1.3 inch 240x240 16 bit LCD
• 2 zone touch
• Vibration motor
• GPS receiver (UBlox)
• Heart rate monitor
• 3 Axis Accelerometer, 3 Axis Magnetometer
• 350mAh battery (1 week standby time)
• Nordic 64MHz nRF52832 ARM Cortex-M4
• Bluetooth LE
• 64kB RAM 512kB on-chip flash, 4MB external flash
• Waterproof (up to 10m)
• NO Wifi!

Bangle.js 1 & 2

this is an open source smart watch that can be easily programmed in java script.

• https://www.espruino.com/
• https://www.espruino.com/Bangle.js
• https://www.espruino.com/Bangle.js2

Examples and Tutorials

• https://www.espruino.com/Quick+Start+Code
• https://www.espruino.com/Tutorials
• https://banglejs.com/apps/
• https://gist.github.com/rozek

Visualizing Acceleration data

Example from: https://github.com/espruino/BangleApps/blob/master/apps/accelgraph/app.js

 1 Bangle.loadWidgets();
 2 g.clear(1);
 3 Bangle.drawWidgets();
 4 var R = Bangle.appRect;
 5 
 6 var x = 0;
 7 var last;
 8 
 9 function getY(v) {
10   return (R.y+R.y2 + v*R.h/2)/2;
11 }
12 Bangle.on('accel', a => {
13   g.reset();
14   if (last) {
15     g.setColor("#f00").drawLine(x-1,getY(last.x),x,getY(a.x));
16     g.setColor("#0f0").drawLine(x-1,getY(last.y),x,getY(a.y));
17     g.setColor("#00f").drawLine(x-1,getY(last.z),x,getY(a.z));
18   }
19   last = a;x++;
20   if (x>=g.getWidth()) {
21     x = 1;
22     g.clearRect(R);
23   }
24 });

Bangle.js IDE

There is a online IDE that uses Web-BLE to program the watch. There is no need for any local installation.

• IDE https://www.espruino.com/ide/
• Emulator https://www.espruino.com/ide/?emulator

(Example show is a timer: https://www.espruino.com/Bangle.js+First+App)