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franksacco
Visitor II
October 8, 2024
Solved

Battery powered B-U585I-IOT02A

  • October 8, 2024
  • 1 reply
  • 1582 views

I'm building a simple application that collects environmental data from sensors (pressure, temperature and humidity) using the B-U585I-IOT02A development board. Since I want to deploy the node directly on the field, I'm planning to power the board using several AA batteries through the VIN pin.

In order to estimate the battery life, I tried to measure the power consumption of the chip only using JP3, and of the entire board with a source meter in VIN.

Regarding the consumption of the chip alone, I get an average of 2 mA, a value that seems consistent with what is stated in the manual. While for the whole board, I get about 170 mA on average with a 5 V supply. Also, I notice that the ST-LINK debugger remains unnecessarily powered.

Why is the total consumption of the board so high? What can I do to reduce the consumption and have a longer battery life?

 

Thanks in advance.

    This topic has been closed for replies.
    Best answer by Andrew Neil

    The thing with development boards, as the name suggests, is that they're intended for use during development - not deploying to the field.

    That's why they have things like ST-Link built in, which are great for development, but unnecessary - or even a disadvantage - in deployment.

    If you're just looking for LoRaWAN, then I've had success with the B-L072Z-LRWAN1:

    https://www.st.com/en/evaluation-tools/b-l072z-lrwan1.html

    It did take some fighting to get the power consumption down:

    https://community.st.com/t5/stm32-mcus-wireless/excess-current-consumption-running-b-l072z-lrwan1-from-battery/td-p/322961

    For something more recent, you could try an STM32WL Nucleos:

    https://www.st.com/en/evaluation-tools/nucleo-wl55jc.html

     

    1 reply

    A
    Andrew Neil
    Super User
    October 8, 2024
    @franksacco wrote:

     Since I want to deploy the node directly on the field,.

    Not sure that board is intended for deploying to the field?

    Perhaps look at SensorTile.box:

    https://www.st.com/content/st_com/en/campaigns/sensortile_box.html

    or similar?

    F
    franksaccoAuthor
    Visitor II
    October 8, 2024

    Thanks for the reply.

    In my case the MCU used is not so important. However, I'm comparing several environmental sensors, so I need the LPS22HH and HTS221 sensors on the board. In addition, the sensor node is composed of the B-U585I-IOT02A board with the X-NUCLEO IKS4A1 extension attached, 3 external sensors (via I2C) and an external LoRaWAN modem (via UART).

    Do you have any suggestion regarding the development board to use?

    A
    Andrew NeilAnswer
    Super User
    October 8, 2024

    The thing with development boards, as the name suggests, is that they're intended for use during development - not deploying to the field.

    That's why they have things like ST-Link built in, which are great for development, but unnecessary - or even a disadvantage - in deployment.

    If you're just looking for LoRaWAN, then I've had success with the B-L072Z-LRWAN1:

    https://www.st.com/en/evaluation-tools/b-l072z-lrwan1.html

    It did take some fighting to get the power consumption down:

    https://community.st.com/t5/stm32-mcus-wireless/excess-current-consumption-running-b-l072z-lrwan1-from-battery/td-p/322961

    For something more recent, you could try an STM32WL Nucleos:

    https://www.st.com/en/evaluation-tools/nucleo-wl55jc.html

     

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