User manual

1-Wire Application Guide v1.04 Page 24 of 41
Figure 16 Tim Bitson 1-Wire Barometer
The Motorola MPX4115 device outputs a voltage proportional to the air pressure.
This voltage is scaled up by the amplifier(s) to be within a useable range for the
DS2438 ADC and then converted to digital on the 1-Wire bus.
These devices do not need to be placed outdoors. Unless you have an
extremely airtight building, the air pressure indoors will always be the same as
the air pressure outdoors.
When used with a TEMP08, set the DS2438 type to “B” (Barometer).
3.8 Lightning Sensor