Question regarding external sensor use with mDot EVB

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  • #31751

    Hi all,
    Just a quick question, I’m using a mDot EVB developer kit for my dissertation and have been asked to top solder on an extra temperature sensor to simulate a probe, however surely this would interfere with the internal sensors using the same I2C port?
    Is it possible to use an external sensor with this module?
    I’m using a SCD30 temp/humd/c02 sensor and it appears to use a different address to the other sensors, I’m just not certain and don’t want to ruin the module.
    Thank you!

    #31757

    Hi Ryan,
    Take a look at this link:
    https://www.circuitbasics.com/basics-of-the-i2c-communication-protocol/
    It’s as simple as it looks. As you already know, devices just need a different address to function properly.
    The schematic can be found here:
    https://www.multitech.com/documents/publications/hardware-guides/s000707.pdf
    JP2 is under the LCD. You can access it from the bottom of the PCB. The square pin is pin 1.
    I’d recommend you also look up and understand part PCA9517A. Again a pretty basic thing.
    Good luck and have fun!
    Leon

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