1 Wire Examples

Some examples of 1-wire devices usage in MisterHouse

There are several methods available in MisterHouse for talking to 1-wire devices. These are::

• [AnalogSensor_Item, oxc, and digitemp or owfs](1-wire temperature)
• i Button items
• Owfs_Item, owfs
• RF_Item, W800, RFXSensor
• weather_iB_OWW_client script, oww
• xPL_Sensor_Item, xpl-owfs, and owfs
• Using Tasmota as a data collector

1-wire primer

1-wire can be a bit daunting at first, there are lots of interfaces, sensors and multiple ways to read them. The following page from Marc gives an example of what can be done, where to buy some of this, and what is recommended for use. Example and walk through of temperature and HVAC activation graphing with misterhouse and cacti more specifically, refer to the 1 wire setup and details section.

Software comparison

Here is a comparison of the various methods of using 1-wire devices in MisterHouse:

Module, Program, or Script Names	Adaptors	Hubs	Temperature Sensors	Other Sensors	Digital Output	Notes
AnalogSensor_Item, oxc, digitemp	DS2490, DS9790, DS9790U	Yes	DS18S20, DS1820, DS18B20, DS1822, DS2438, DS28EA00	DS2438 used as humidity sensor	No	digitemp supports counters used in rain sensors but oxc does not
AnalogSensor_Item, oxc, owfs	see list	Yes	see list	see list Note that oxc only supports temperature and humidity sensors	No	oxc broadcasts xAP packets so sensors can be on remote machines
iButton item					Yes	See the Misterhouse documention for more about iButton_Item
Owfs_Item, owfs	see list		see list	see list	Yes	See the Misterhouse documention for more about Owfs_Item
RF_Item, W800, RFXSensor	W800	No	DS2438,
DS18B20	DS2438 used as humidity, pressure, or low voltage sensor	No	The current RFXSensor supports up to 8 1-wire sensors
weather_iB_OWW_client script, oww	see list	Yes	see list	see list	No
xPL_Sensor_Item, xpl-owfs, and owfs	see list	Yes	see list	see list Note that xpl-owfs supports temperature, humidity, counters (rain). and current (solar) sensors	Yes	See the xpl-owfs man page for information on using digital outputs.

Tasmota and 1-wire

Tasmota is a firmware that can be downloaded to most EST8266 based wifi modules and comes with drivers that support the DS18B20 temperature sensor. The standard build supports up to 8 sensors connected to each of its GPIO pins. MisterHouse can then receive these readings via HTTP or MQTT as described here.

1- Wire Reliability

1-Wire Reliability

Other contributions and Examples

• Rick Steeves 1-wire temperature implementation
• Home Built Pool Filter Pressure Gauge