Table of Contents
temperature | version | type_number | temperature_offset | address
| crc8 | id | locator | r_address | r_id | r_locator | type ]]
UVI/UVI | UVI/UVI_offset | UVI/in_case | UVI/valid | temperature | version |
type_number | temperature_offset ]]
version | type_number | address | crc8 | id | locator | r_address |
r_id | r_locator | type ]]
- HobbyBoards EE/EF Microprocessor-based slaves
Violet (UV) Index sensor
- Soil and Leaf moisture measurements
- 4-channel hub with switchable branches
moisture/is_moisture.[0-3|ALL|BYTE] | moisture/is_leaf.[0-3|ALL|BYTE]
moisture/calibrate/min | moisture/calibrate/max | moisture/calibrate/raw.[0-4|ALL]
hub/branch.[0-3|ALL|BYTE] | hub/short.[0-3|ALL|BYTE]
read-only, floating point
- Device with
- Device without temperature
- Moisture Meter
Temperature read every 30 seconds. Resolution .5C (uses an on-board DS18B20).
Temperature is only present in the EE-series devices.
Offset stored on device to apply to temperature readings.
UV Index (ultraviolet index) in the range 0.0 to 16.0 resolution .1
UVI version of the EE device has a UVI sensor. Readings made every .5 seconds.
read-write, floating point
Signed offset to apply to the UVI measurement. Stored on-device non-volatile.
Flag to apply compensation for the protective case. Stored on-device non-volatile.
read-only, yes-no Flag the the EE device type matches the known
Up to 4 sensors reading moisture can be attached. OWFS addresses the sensors
as 0 through 3 while the datasheet uses 1-4. Two types of external sensors
are supported (and the data range):
- Watermark Soil Moisture Sensor
- Leaf Wetness Sensor
Set or get the type of sensor attached to each channel. Note that OWFS
addresses the sensors as 0 through 3 while the datasheet uses 1-4. Two types
of external sensors are supported:
- Watermark Soil Moisture
Note that is_leaf and is_moisture are complementary and
clearing one sets the other.
Set or get the upper and lower range for the raw data for leaf wetness
scaling. See the datasheet for details.
read-only unsigned integer
Read the raw leaf wetness values for setting scaling. See the datasheet
for details. Note that OWFS addresses the sensors as 0 through 3 while
the datasheet uses 1-4.
4-channel hub. Individual branches can be switched
on and off.
The HobbyBoards hub has four 1-wire bus lines. Each branch is electricaly
isolated from reflections and shorts, and can be optionally excluded from
the 1-wire network.
You can turn each branch on or off by writing 0 (off)
or 1 (on) to the corresponding property. Note that OWFS indexes the branches
0 to 3 while the datasheet uses 1 to 4.
The easiest way to turn all the
branches on is to write 15 (0x0F) to hub/branch.BYTE
Is the corresponding branch in "short" condition? (Electrically shorted
Firmware version for the EE/EF device. Reported in HH.HH format where HH
is a hex digit (0-9A-F).
Index of the type of sensor built into this device. Current known assignments:
- UVI (Ultraviolet index)
- Moisture meter
- Moisture meter with datalogger
The entire 64-bit unique ID. Given as upper case hexidecimal digits (0-9A-F).
address starts with the family code
r address is the address in reverse order, which is often used in other
applications and labeling.
The 8-bit error correction portion. Uses cyclic redundancy check. Computed
from the preceding 56 bits of the unique ID number. Given as upper case
hexidecimal digits (0-9A-F).
The 8-bit family code. Unique to each type of device. Given as upper case
hexidecimal digits (0-9A-F).
The 48-bit middle portion of the unique ID number. Does not include the family
code or CRC. Given as upper case hexidecimal digits (0-9A-F).
r id is the id in reverse order, which is often used in other applications
Uses an extension of the 1-wire design from iButtonLink company that associated
1-wire physical connections with a unique 1-wire code. If the connection is
behind a Link Locator the locator will show a unique 8-byte number (16 character
hexidecimal) starting with family code FE.
If no Link Locator is between the device and the master, the locator field
will be all FF.
r locator is the locator in reverse order.
Is the device currently present on the 1-wire bus?
Part name assigned by Dallas Semi. E.g. DS2401 Alternative packaging (iButton
vs chip) will not be distiguished.
is a wiring protocol and series of devices designed and manufactured by
Dallas Semiconductor, Inc. The bus is a low-power low-speed low-connector scheme
where the data line can also provide power.
Each device is uniquely and
unalterably numbered during manufacture. There are a wide variety of devices,
including memory, sensors (humidity, temperature, voltage, contact, current),
switches, timers and data loggers. More complex devices (like thermocouple
sensors) can be built with these basic devices. There are also 1-wire devices
that have encryption included.
The 1-wire scheme uses a single bus master
and multiple slaves on the same wire. The bus master initiates all communication.
The slaves can be individually discovered and addressed using their unique
Bus masters come in a variety of configurations including serial, parallel,
i2c, network or USB adapters.
OWFS is a suite of programs that
designed to make the 1-wire bus and its devices easily accessible. The underlying
priciple is to create a virtual filesystem, with the unique ID being the
directory, and the individual properties of the device are represented
as simple files that can be read and written.
Details of the individual
slave or master design are hidden behind a consistent interface. The goal
is to provide an easy set of tools for a software designer to create monitoring
or control applications. There are some performance enhancements in the
implementation, including data caching, parallel access to bus masters,
and aggregation of device communication. Still the fundemental goal has
been ease of use, flexibility and correctness rather than speed.
The EEEF (3)
are a reference platform of microprocessor based 1-wire slaves.
In general they require external power, and have an on-board index for the
specific capabilities. They are designed by Eric Vickery at HobbyBoards.com
The EE class device uses family code EE and has an included temperature
sensor. The EF devices have no temperature sensor,
The UVI sensor is
an implementation of the EE class device with Ultra Violet Index sensing.
All it’s specific properties are in the UVI/ directory.
All 1-wire devices are factory assigned a unique 64-bit address. This address
is of the form:
- Family Code
- 8 bits
- 48 bits
- 8 bits
under OWFS is in hexidecimal, of form:
where 01 is an example
8-bit family code, and 12345678ABC is an example 48 bit address.
is optional, and the CRC code can included. If included, it must be correct.
TAI8570 EDS0066 (3)
Paul Alfille (email@example.com)
- Moisture and Leaf Sensor
- 4 Channel Hub
Table of Contents