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Guy McCarthy

  • Guy McCarthy posted a new activity comment 5 months, 2 weeks ago

    Oh, right… I meant to say, the local storage device is a 47L16:
    https://ww1.microchip.com/downloads/en/DeviceDoc/20005371C.pdf

  • The DS Mini is based on a PIC32MX150F128 processor, with 128K Flash and 32K RAM. The BLE transceiver is a RN4871 module, with the protocol stack in firmware. So processor memory is not much of an issue. The local storage is kind of cool; it’s an EMC1001 with 16K of static RAM. That allows fast access with minimal power consumption. Upon…[Read more]

  • OK, here is another attempt to add the photo

  • Thanks for the suggestions. Here’s a photo of the Data Station Mini, which accepts external sensors in the mikroBUS format (as in “Click” boards from MikroElektronika.) It’s based on a PIC32MX150 processor, with a digital temp sensor, EEPROM storage, and an efficient power circuit. There’s a AA battery holder on the back side. This is…[Read more]

    • Hey thanks for the details. There doesn’t seem to be any picture attached.
      Just wondering what is the full version of the PIC32MX150 – how much ram and flash.
      I’m guessing a bit, but seems to me for networking with LoRaWaN the issue is how to gateway to a TCP/IP centric world. Of course Rome wasn’t built with one project either …. 🙂

      FYI, my…[Read more]

  • I’m developing a couple of inexpensive data loggers (open source, of course) and looking for some input on sensors. What types are commonly used, and do they require 3V or 5V?

    The low-end board is powered by a single AA and uses local memory for storage, with BLE for control and data transfer. It can provide 3V to external sensors. The mid-range…[Read more]

    • Hey Guy,

      I am relatively new to this but have solved a few problems. I can’t really answer your question because I feel like the science objectives would really need to drive the sensor selection. If you are looking to reach a broad audience, then I guess I would go with some generally applicable environmental sensors such as temp/soil…[Read more]

    • I echo Jeremy Hise . To play with wireless (BLE & LoRa) that can be close to or embedded in the top 6″ of soil then temperature, humidity and soil moisture. Of course so many “dust” sensors floundered in real world conditions that micros don’t like in the circuitry like humidity, and 2.4GH that is absorbed by real world vegetation.

  • Guy McCarthy became a registered member 6 months, 3 weeks ago