Compatibility of Puck.js with Rechargeable Coin Batteries

Thanks a lot!

I checked with E.getPowerUsage() what my PowerUsage was, and BLE took around 600-700, while the cpu was around 100-200 or so. I have now set NRF.setConnectionInterval() to 50 - it is now slower for uploading code, but reduced the PowerUsage to only around 50-100~ compared with 600-700 it took before (i also implemented a "switching bluetooth off / on by pressing the button 15 seconds" to save battery even more if i don't actively need bluetooth).

I also found out that the PMW was eating continous 200 Power, and it seems to go away if i reset each LED after using the LEDs. So i don't know if this added to the battery drain if it did run 24/7 all the time without me noticing (and even after setting the Leds brightness all to 0).

Before i did this fixes, it was around 1000-1400 Power Useage overall. Now it's way way less.

If you want acceletometer once a second, use Puck.accelOn(1.6) and Puck.on('accel', fn) - that will be 1.6 times a second, but will be a lot more efficient keeping the accelerometer on than repeatedly turning on on and off like you were doing (even if you run it faster than than and throw readings away)

I assumed that just requesting one reading a second would be more performant than having the accelerometer readings run all the time. It's good to know that this is not the case and i can save more energy if i do it this way. Thanks for this tip!

LED lights draw a lot of power 8mA vs 0.04mA for the accelerometer - try blinking them for ~100ms or so, or use pinMode(LED1,"input_pullup") to turn them on very dim rather than leaving them lit (if that's what you were doing)

I have written me a function to switch on & off the leds like this:

function SetLights(r, g, b)
{
 //RED, GREEN, BLUE
 var LED_R   = LED1;
 var LED_G = LED2;
 var LED_B  = LED3;	
	
 analogWrite(LED_R, r);
 analogWrite(LED_G, g);
 analogWrite(LED_B, b);
}

i use it normally by SetLights(1,0,0); as an example. But i also need a red light that adjusts in brightness to indicate the value of a variable as a visual feedback, so i also use SetLights(0.3,0,0); as an example. To reset the LEDs i did just set the value for the analogWrite() to 0. But it seems this did let the PMW run in background 24/7 from what i see in the E.PowerUseage. I have fixed this now thought by resetting the LEDs each time after i used the LEDs.

The Battery which had yesterday 40-45% and then today only 15% left was completly drained after reach around 2volt. So seems E.getBattery() was accurate.

Thanks again for the helpful advice!
Cyyy