I'm trying to make my own home wireless security system. I will be using probably 3 AA batteries to power these devices. My problem is that I need to know if the batteries will be enough to power the devices for at least 6 months. Below are the details of all the devices I will be using:

  1. Mini Nano V3.0 ATmega328P Microcontroller Board w/USB Cable For Arduino
  2. Makerfire Arduino NRF24L01+ 2.4GHz Wireless RF Transceiver Module
  3. uxcell MC 38 Mount Wired Door Window Sensor Magnetic Reed Switch Recessed

Below are some project requirements that might be useful:

  1. For the Nano, I want to put it to sleep using delay(2000) in the loop() function. The Nano will be the one checking the window sensor.
  2. I will be using a project enclosure of about 4X4 inches.

If this will not be possible maybe someone knows of other devices that use less power that will be more suitable for this project? I would prefer something easy to use like Arduino Nano with USB so I can easily program it.

  • \$\begingroup\$ use the reed switch to turn on everything else. \$\endgroup\$
    – dandavis
    Jan 12 '18 at 7:17
  • \$\begingroup\$ Are you sure the delay() function puts the chip to sleep? I wouldn't think so but am not familiar with the Nano. \$\endgroup\$
    – Transistor
    Jul 17 at 21:25

The components you've selected are impropriate (assuming you selected items from Amazon): https://www.amazon.com/ATmega328P-Microcontroller-Board-Cable-Arduino/dp/B00NLAMS9C

The Nano has extra components (LEDs, regulator and Serial/USB chip) on it that are not required. These will require power even when you put the MCU to sleep.

The NRF24L01 is ok, but won't run on 3 x 1.5 V batteries. This unit has no onboard regulator (which is correct for your application) but would only be suitable for 2 x 1.5 V cells


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