Gamebuino battery data

[inversesandwich]

I've published the data captured by the batterylogger sketch to an interactive graph! Click here to view it. I might post more in the future to see if battery performance changes.

[gamebox13]

I've tried to compile this sketch and run, but had some problem with output txt file. On gamebuino it runs without errors, txt file created but on PC it not opens, because it is corrupt (says filesize is not ok). After chkdsk the file is empty. Tried many times, runs about 9 hours before battery discharge or 10 min and got same result with corrupt file.

[Sorunome]

Which SD library do you use?

[gamebox13]

This sketch was in gamebuino's examples and uses tinyfat.

[Sorunome]

Yeah, somehow that one doesn't work anymore for writing files, only for reading them. IIRC SdFat works fine for reading&writing files, so use that one instead

[gamebox13]

I made script, which plot voltage's graph on screen. There are max,min voltage and time. It has 512 size of array and can storage about 17 hours graph with every 2 minutes records.

PC250295.JPG (236.13 KiB) Viewed 11280 times

Code:

#include <Gamebuino.h>
#include <SPI.h>
Gamebuino gb;
unsigned int tm=0;
int i;
int t;
unsigned long x,y,xt,yt;
unsigned int bmax;
unsigned int bmin;
unsigned int bat;
unsigned int data[512]={};
void setup() {
  // put your setup code here, to run once:
  gb.begin();
  gb.titleScreen(F("Battery Monitor"));
  gb.backlight.automatic = false;
  gb.backlight.set(0);
  gb.display.clear();
  gb.display.persistence = true;
  gb.battery.show = false;
  gb.display.textWrap = false;
 
  data[0]=int(gb.battery.voltage);
}

void loop() {

  if(gb.update()){
  if(gb.buttons.pressed(BTN_C)){
      gb.titleScreen(F("Battery Monitor"));
      //reset();
    }
  t++;
 
  if (t>=1200*2){
    t=0;
    if (tm<511){
      tm++;
   
      bat=gb.battery.voltage;
      data[tm]=bat;
      bmin=4500;
      bmax=0;
      for (i=0; i<tm; i++)
      {
        if (data[i]<bmin) bmin=data[i];
        if (data[i]>bmax) bmax=data[i];
      }
   
    }
  }
   
 
  if((gb.frameCount%20) == 0){
   gb.display.clear();
   xt=0;
   yt=0;
    for (i=0; i<tm; i++)
      {
        x=1+i*83/(tm);
        y=int(long(47)*(bmax-data[i])/(bmax-bmin));
        gb.display.drawLine(xt,yt, x,y);
        xt=x;
        yt=y;
      }
  gb.display.drawFastVLine(0,0,48);
  gb.display.drawFastHLine(0,47,84);
  gb.display.cursorX = 40;
  gb.display.cursorY = 41;
  gb.display.print(tm*2);
  gb.display.println(F("min"));
  gb.display.cursorX = 60;
  gb.display.cursorY = 0;
  gb.display.print(bmax);
  gb.display.println(F("mV"));
  gb.display.cursorX = 2;
  gb.display.cursorY = 41;
  gb.display.print(bmin);
  gb.display.println(F("mV"));
 
  if (gb.battery.level<=1) gb.sound.playTick();
  }
  }
}