Nick,

We have confirmed that the .Min() method returns the max value for all data types, not just Short. We will have this problem fixed in the next release. Thank you for pointing this out!

We have also tried to replicate the for loop step problem but it seems to be working fine for us. If I run the following code:

Class testCase   
    Shared Event Boot()       
        Dim value As Integer = 0       
        For a As Integer = 0 To 6 Step 2
            value = a
        Next       
    End Event   
End Class

I get the expected results of stepping by 2 per loop iteration. Can you elaborate on what you are seeing?

Josh

Try this event for the reed switch:

Shared Event ReedSwitchChanged()
        'debounce interrupt
        Thread.Sleep(100000)
        Thread.ClearHardwareEvent()
               
        If ReedSwitch = True Then
            'magnet far from reed switch
            LedRed = False   
        Else
            'magnet close to reed switch
            LedRed = True
        End If

    End Event

Nick,

Were you able to get the LIS2DH12 up and running?

Thanks,

Josh

If you take a look at the schematic for the module: http://www.mcthings.com/s/mcMod110-Schematic-1.pdf . It shows what resistor values are connected to the pins.

The SWDCLK and SWDIO pins are required for production programming of the mcModules, they are not used during normal operation and must be left unconnected.

Nick, thanks a lot for this detailed post. I just have a few comments to add below.

You are correct, we are using an inverted-F type antenna based on the TI DN0007 design note. The ground plane for the antenna runs the entire area of the mcmodule directly under it.

1) Surroundings: You are correct that the materials in the near field of the antenna have a large impact on the impedance which effects the matching. The antenna on the mcmodule is matched to an open air environment. Different materials have different effects on the antenna matching, plastics and wood have minimal impact whereas metals, liquids, and people (holding the device in your hand) have a huge impact on the matching. Placing the mcmodule on a drywall or wood surface will have minimal impact on the RF performance whereas placing the device on a metal door with have a LARGE impact, try placing the mcmodule as far away as possible from the metal surface for best results.

2) Ground Plane: We have done a quite a bit of RF testing of the mcmodule in an anechoic chamber enviroment. We did testing of the mcmodule both with and without the coin cell with no notable degradation of the RF performance with the coin cell installed.

3) Shielding: Placing the mcmodule in a metal fridge or freezer will have a huge impact on the rf performance. The only way for the RF signal to be received or transmitted would be through the non-metal gaskets of the freezer. Also, unless you are using a battery that is designed to work at lower temperatures the voltage of the battery will be lower with will effect the tranmitted power of the device.

4) Attenuation: Again, different materials attenuate RF signals worse than others. Metals, liquids, and people(mostly liquid) have a much greater effect then wood or plastics.

5) Orientation: Polarization of the antennas also has a large effect on the range. In our testing in an anechoic chamber environment we have seen differences of 9~10 dBm between horizontal and vertical polarization. Simply rotating your mcmodule by 90 degrees (or changing the position of the mcGateway) can have a huge impact on the range.

The 200m range we have tested is line of sight in open air.

The next iteration of the mcgateway will include a PA/LNA which will increase the power output and also the receiver sensitivity of the mcgateway. We also have a horizontally and vertically polarized antenna we can switch between to provide antenna diversity which will also increase the range. In addition to this, the mcMod120 includes a radio with slightly improved power output and receiver sensitivity as well.

If you have any other questions please post them.
 
mc-Josh

Hey guys, we have finally made the time to create the mcMod110 product specification. It can be found here:

http://www.mcthings.com/s/mcMod110-Product-Specification-V03-kz9k.pdf

If you have any comments or suggestions feel free to post them to this thread.

mc-Josh