BMP180 breakout board on low voltage

[danta]

I bought some cheap BMP180 breakout boards on ebay for use in a 2*AA battery sensor board.

Does anyone know how to modify such a board so it works using voltages lower than 3.3V?

[hek]

You'll find the pin layout and block diagram in the datasheet:
http://www.vssec.vic.edu.au/media/41229/BMP180-datasheet.pdf

Should be possible to see where the VCC pin pop up by the regulator with a multimeters continuity test mode.

Found this for the GY-68 module:

1.8V to 6V Supply Voltage

[danta]

Thanx for the schematic. I didn't know the module was called GY-68.

Apparently the board isn't as complex as I thought. Just bypassing the regulator should do the trick.

[Mad Moo]

Hello @danta!

I think BMP180 is ideal to use with 2 x AA power sypply. Bellow the fragment of datasheet. You can use it without any regulators.

Am I right?

[danta]

That was indeed the plan. 2 full batteries in series will start of at 3.0V and if they're empty, the voltage will have dropped to 1.6V

But to be fair, I'll be happy if it still works at 1.8V, because that’s the voltage the atmega328 will start to fail.