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BangleApps
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accelrec: Increase record time to 5 second 

Calculate the time moving in graph display
      Trigger on 1.04g now, and record 10 samples before trigger
master
Gordon Williams 2020-10-21 09:09:51 +01:00
parent c88179bce6
commit d7cf959bab
3 changed files with 20 additions and 8 deletions
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2
apps.json
View File

@ -2109,7 +2109,7 @@
"name": "Acceleration Recorder",
"shortName":"Accel Rec",
"icon": "app.png",
"version":"0.01",
"version":"0.02",
"interface": "interface.html",
"description": "This app puts the Bangle's accelerometer into 100Hz mode and reads 2 seconds worth of data after movement starts. The data can then be exported back to the PC.",
"tags": "",

3
apps/accelrec/ChangeLog
View File

@ -1 +1,4 @@
0.01: New App!
0.02: Increase record time to 5 second
Calculate the time moving in graph display
Trigger on 1.04g now, and record 10 samples before trigger

23
apps/accelrec/app.js
View File

@ -1,23 +1,24 @@
var acc;
var HZ = 100;
var SAMPLES = 2*HZ; // 2 seconds
var SAMPLES = 5*HZ; // 5 seconds
var SCALE = 5000;
var THRESH = 1.01;
var THRESH = 1.04;
var accelx = new Int16Array(SAMPLES);
var accely = new Int16Array(SAMPLES); // North
var accelz = new Int16Array(SAMPLES); // Into clock face
var accelIdx = 0;
var lastAccel = undefined;
var lastAccel;
function accelHandlerTrigger(a) {"ram"
if (a.mag*2>THRESH) { // *2 because 8g mode
tStart = getTime();
g.drawString("Recording",g.getWidth()/2,g.getHeight()/2,1);
Bangle.removeListener('accel',accelHandlerTrigger);
Bangle.on('accel',accelHandlerRecord);
if (lastAccel) accelHandlerRecord(lastAccel);
lastAccel.forEach(accelHandlerRecord);
accelHandlerRecord(a);
}
lastAccel = a;
if (lastAccel.length>10) lastAccel.shift();
lastAccel.push(a);
}
function accelHandlerRecord(a) {"ram"
var i = accelIdx++;
@ -29,7 +30,8 @@ function accelHandlerRecord(a) {"ram"
function recordStart() {"ram"
Bangle.setLCDTimeout(0); // force LCD on
accelIdx = 0;
lastAccel = undefined;
lastAccel = [];
Bangle.accelWr(0x18,0b01110100); // off, +-8g
Bangle.accelWr(0x1B,0x03 | 0x40); // 100hz output, ODR/2 filter
Bangle.accelWr(0x18,0b11110100); // +-8g
Bangle.setPollInterval(10); // 100hz input
@ -42,8 +44,9 @@ function recordStart() {"ram"
function recordStop() {"ram"
console.log("Length:",getTime()-tStart);
//console.log("Length:",getTime()-tStart);
Bangle.setPollInterval(80); // default poll interval
Bangle.accelWr(0x18,0b01101100); // off, +-4g
Bangle.accelWr(0x1B,0x0); // default 12.5hz output
Bangle.accelWr(0x18,0b11101100); // +-4g
Bangle.removeListener('accel',accelHandlerRecord);
@ -76,9 +79,14 @@ function showData() {
// work out stats
var maxAccel = 0;
var tStart = SAMPLES, tEnd = 0;
var vel = 0, maxVel = 0;
for (var i=0;i<SAMPLES;i++) {
var a = accely[i]/SCALE;
if (a>0.1) {
if (i<tStart) tStart=i;
if (i>tEnd) tEnd=i;
}
if (a>maxAccel) maxAccel=a;
vel += a/HZ;
if (vel>maxVel) maxVel=vel;
@ -87,6 +95,7 @@ function showData() {
g.setFont("6x8").setFontAlign(1,0);
g.drawString("Max Y Accel: "+maxAccel.toFixed(2)+" g",g.getWidth()-14,g.getHeight()-50);
g.drawString("Max Y Vel: "+maxVel.toFixed(2)+" m/s",g.getWidth()-14,g.getHeight()-40);
g.drawString("Time moving: "+(tEnd-tStart)/HZ,g.getWidth()-14,g.getHeight()-30);
//console.log("End Velocity "+vel);
g.setFont("6x8").setFontAlign(0,0,1);
g.drawString("FINISH",g.getWidth()-4,g.getHeight()/2);