Member #294774

Member Since: January 19, 2012

Country: United States

  • Not all sensors are the same...

    I've been trying to use the MicroMod Weather Carrier Board with the sensors from a Holman weather station

    No matter what I did I could not get the anemometer to give a resistance output, either with the MicroMod Weather Carrier Board or directly with a multimeter. The wind speed sensor seemed to work, but didn't seem to be the right resistance for a reed relay.

    So I pulled the sensors apart to have a look. From the outside, the anemometer looks identical to the one you sell, but the Holman sensors are now active. Photo of the anemometer internals:

    The 4 wire interface for this version is:

    1. not connected

    2. Vdd - 3.3v

    3. DATA - Wind Direction output

    4. anemometer pulse

    5. GND

    6. not connected

    Obviously this sensor array does not work with your board :-(

    Update: This sensor array has a serial data stream from the anemometer, protocol currently unknown.

  • This device now has a RF22S chip on it, and reading the device type register shows version 6. There are e new register datasheets corresponding to this version at:

    SI4430/31/32 Register Descriptions

    FIFO mode, Direct mode, and Packet Handler Operation

    (edited to fix link formatting)

  • The problem with these displays, and it seems to be common to all the manufacturers, is that the PCB material is too thin. After a month or two, the board slowly bows away from the glass display panel under pressure from the conductive rubber connector strip. Pressing on the top centre of the metal part of the display makes it work again, but only temporarily.

    If the LCD module is soldered to another board and the two top screws installed and tightened carefully to pull the bow out of the module it seems to prevent (or solve) the problem.

    Mine all failed after a month or so when plugged into a proto board socket.

    The only real fix for this display is to redesign the metal cover with a hold-down tag in the top centre, or make it with a thicker PCB that doesn't bow under pressure from the connector. Until that happens I won't be buying any more.

No public wish lists :(