User manual

1-Wire Application Guide v1.04 Page 18 of 41
however, later versions, such as those formerly available from AAG, and
previously from Hobby Boards, used 2 reed switches, which meant that the
counters were incremented twice as often as the original design. TEMP08 is
designed to work with the later versions only. If you are not sure which are
supported, contact Midon Design.
When used with TEMP08, set the DS2423 type to “W” (wind). Only one wind
speed counter is supported on TEMP08.
Hobby Boards now sells the Inspeed and ADS Anemometers. Wind speed is
provided with DS2423 counters, however, in a different format than previous 1-
Wire Anemometers. To use these sensors, set TEMP08 to “L” (Lightning) and
calculate the wind speed via the formulae below.
Inspeed Anemometer: Wind Speed = (2.5 x Count) / Time
ADS Anemometer: Wind Speed = (1.5 x Count) / Time
Where: Wind Speed = speed in miles per hour
Count = the current counter reading less the previous counter
reading
Time = the time since the last reading
3.5 Wind Direction
There are two main variations of the original 1-Wire wind direction sensors. The
original design used reed switches connected via DS2401 1-Wire serial numbers
to denote the position of the wind. The other 1-Wire version supported by
TEMP08, used reed switches connected via voltage dividers to a DS2450 Quad
ADC device, as per Figure 11.