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DEVICES
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DEVICES
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This is a list of the currently known devices, providing some basic information
on them and how well they work with this project's code, if at all.
At the moment, the code only works with devices using the HID drivers, but we
intend to add support for devices acting like a serial port eventually.
0c45:7401
HID
I do not yet know how to recognize the different subtypes of this device,
as until recently I believed the TEMPerV1.2 device to be the only one using
these USB IDs. I hope it can be done similarly to the 1130:660c devices.
TEMPerV1.2 WORKS
This device has one internal temperature sensor, which appears to be a
Fairchild FM75 or compatible sensor chip.
This was the first device owned by EdorFaus, and hence was the first
one to be supported, and sees the most testing during development.
This is the type Cray's pcsensor program was written for.
TEMPer2.2 EXPERIMENTAL PARTIAL
This device has two temperature sensors, one internal and one external.
First reported to exist 2012-03-08 in relavak's comments.
It has been reported to work with Cray's pcsensor, with the external
sensor on offsets 5,4 and the internal on 3,2 just like TEMPerV1.2.
Hence, reading the internal sensor should already work, but the
external one won't, as we don't know how to separate these subtypes.
0c45:7402 WORKS PROBABLY
HID: TEMPer2HumiV1.x
Both V1.0 and V1.1 have been seen; V1.1 was confirmed working at 2011-12-28
in issue #1 after commit b668b00eb16675eba53385edeff6b0a70b38a614.
However, the code has been restructured since then - but since it's so
similar to the TEMPerV1.2 device, which works, it should still work.
This device has one internal temperature and humidity sensor, which appears
to be a Sensirion SHT1x or compatible sensor chip.
Read method is the same as TEMPerV1.2, but needs a different formula for
the temperature.
1130:660c
HID
USB product strings are the same; device recognition can be done by reading
from the device (there's an identification byte in a separate data area).
I believe these are older than the 0c45 devices.
0x58: HidTEMPer1 EXPERIMENTAL
I think this has one internal temperature sensor, as that's what the
original temper-1.0 code by relevak reads.
There's some experimental code in this project to read the temperature,
which might work, but has not yet been confirmed to work.
The offsets are known, but the code that reads the sensor data is new.
0x59: HidTEMPer2 EXPERIMENTAL PARTIAL
I think this has two temperature sensors (internal and external), that
both use the FM75 way of calculating the temperature.
There's some experimental code in this project to read the temperature
of the sensors, which might work, but has not yet been tested.
0x??: HidTEMPerHUM NEED INFO
I think this has one internal temperature and humidity sensor; not sure
whether or not that sensor works like TEMPer2HumiV1.x's sensor.
The value of the ID byte for this device subtype is not known, and must
be found before it can be supported. The tempered program should print
this ID when attempting to read this device; please tell me the value.
There's some experimental code in this project to read the temperature
and humidity, which might work, but has not yet been confirmed to work.
The offsets are known, but the code that reads the sensor data is new.
0x5b: HidTEMPerNTC EXPERIMENTAL PARTIAL
I think this has two temperature sensors, one FM75 type internal and
one NTC-type external (which works completely differently from the
other types). (I originally thought this only had the external one.)
There's some experimental code in this project to read the temperature
of the internal sensor, which might work, but has not yet been tested.
The external sensor is completely different than the other known types,
and appears to require multiple reads and writing back the gain on the
fly, and a complex calculation that goes via volts and uses calibration
- so it is not yet supported.
?:? NOT YET
serial: TEMPer232
USB IDs unknown, apparently uses the ch341 kernel driver; some docs are
supposedly available, I haven't seen them (nor looked for them).
I've only seen it mentioned in relevak's thread, which also has mentions
of it being problematic.
1a86:7523 NOT YET
serial: TEMPer16
Uses the ch341 kernel driver.
Has two channels (A/B) of up to 8 temperature sensors each (Tx aka T0-T7),
for a total of up to 16 temperature sensors. Product images suggests these
temperature sensors are the same type as that of TemperNTC. Uses wires with
standard 3.5mm audio connectors to connect the sensors, probably using the
1wire protocol; I'm guessing it contains two 1wire bus chips, and addresses
the sensors individually when reading.
Theoretically, the number of sensors can change at any time, as can which
ones are connected, but I'm not so sure we want to allow that in practice,
since it can be easily done by reopening the device. An alternative would
be to always say 16 sensors, and simply fail the reading of ones that
aren't currently connected - assuming that works in practice (it might).
That would move the management of this to the users of the library.
Note: a lot of this is guesswork, and I may be mixing multiple types here.