Battery PIR power consumption

[Sweebee]

I have a HC-SR501 with an arduino pro mini 3.3v. I want to run it on batteries as long as possible. In sleep the setup draws around 280 uA. Thats quite a lot?

I already removed the power led on the arduino and i use the PIR 3.3v Hack.

The datasheet of the pirs tells me that it uses around 50 uA (@ 5v). When I only measure the pir it uses around 200 uA. The arduino with NRF around 70 uA without the PIR.

Is there a way to reduce it? With this setup and 2 AA batteries it won't last a year.

[Jan Gatzke]

Did you desolder the voltage regulator from the PIR? It can draw some current even when it is not used.

[Sweebee]

No, I havent. lets try...

Edit: I removed the HT7133. The power consumption is not jumping a lot anymore. Sometimes it went from 250 - 320. but now its more stable around 260 uA (with arduino and NRF).

[Andreas Maurer]

But this is not a big step in the desired direction?!

[Sweebee]

@Andreas-Maurer no, not really. Around 160 uA should be fine? Don't know if there is some1 else with a pir sensor on batteries? maybe he can share his experience.

[hek]

What are you using to measure the consumption? uCurrent?

[Sweebee]

I'm using a UNI-T UT136B. Should be quite accurate according EEV.

[Yveaux]

Please read http://forum.mysensors.org/topic/250/how-do-i-use-the-interrupt/14
I measured sleeping current of HC-SR501 (2xAA at 2.86V) at 60uA, using uCurrent.

[Sweebee]

So it should be okay? Even when my meter shows around 180-200 uA with pir only?