allow sensors to operate on voltage lower than 2.7v

[Mickey]

Hi
I made this boards as small as I could and would like to operate them on 3v coin battery - CR2032.


I check them all and the range is excellent (more than 15 meter and behind 3 brick walls)
but they will run out of power quite soon with this battery so what is the simplest and fastest way to change the arduino fuses so it can run down to 1.8v.
If there is a need for external flash I have this one(is it good?):

[Sweebee]

You can use that AVRISP or use an other arduino as ISP. You have to change the BOD bit. Are you using windows or mac? On mac its quite easy with AVRFuses app. On windows you need AVR Studio.

info for mac: http://www.leonardomiliani.com/en/2014/avrfuses-una-gui-per-modificare-i-fuse-delle-mcu-atmel-os-x/
Windows: http://letsmakerobots.com/content/setting-arduino-fuses-manually-avr-studio

You have to burn the fuses like this:

LOW: 0xff
HIGH: 0xda
EXTENDED: 0x06

I wrote some more battery information here: http://forum.pimatic.org/topic/383/tips-battery-powered-sensors

[m26872]

@Mickey
Any progress to share? Do you experience any issues with short battery life due to CR2032s high internal resistance, like reported here ?