Great little sensor. Works perfectly.
Get the English tech sheet and programming is easy. (Found here on another review.)
I use this sensor in my AllStar node (mobile one) for travel. Very low power use and turns the fan on when temp on the Raspberry Pi is too warm. Not often, but it can warm up in the box when all the components are on.
The sensor is in C, know that. Easy to convert to F.
You need to add a jumper from K0 to 12+. Put the fan + on K1 and the fan - on GND. Power to the unit is normal, 12+ and GND, accordingly.
Set the temp you want by pressing the SET button once and flashing number is your temp. By default, the offset is at 2. So if you set 25. The fan turns on at 27 and off at 24.9. You can adjust this by changing the P1 setting. (Hold SET until you see P0... about 5 seconds.) Hit + to get to P1, then press SET to see value. If you want the unit to turn on your fan asap, change to .1 -- Then when you set the sensor to 25, it will start the fan at 25.1 and run until 24.9 (Just below set temp). Adjust as needed. When all programming is done, just let it sit for 10 seconds and it will show current temp. If you are in a hurry, you can hold SET again for 5 seconds.
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Reviewed in the United States on September 10, 2016
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Reviewed in the United States on March 10, 2016
These are great little control units, however, in my experience with ordering 2 of these there are multiple versions available that are NOT identified in the product description. I ordered one of these to install a fan in my home entertainment system in October of last year and it looks at operates identically to the product described above (it has a part number of W1209 silkscreened on the back). This corresponds to the product data sheet that can be found here: [...] However, I recently ordered another unit to install a second fan in my entertainment system, and found that it both appears subtly different and does not function in the same manor (it has a part number of UTR-WK510 on the back).
When setting up the new unit, I first noticed that there were more available parameters. Instead of 7 parameters (P0 to P6) this one has 9 parameters (P0 to P8). P6 is stuck at a value of 1.1 and can’t be changed regardless of the value of P0. P7 has a default of 50.0 and P8 has a default of C. I have no idea what these parameters do. Leaving these 3 parameters with their default parameters I marched ahead with the setup, programming in the same values as are in my existing unit. I quickly noticed that it was not behaving as expected. So, I uninstalled the unit form my entertainment center and did a little trial and error on a bench top. I was able to determine that the programming of the set point and hysteresis values were NOT the same between the 2 units.
For example:
If I want a fan to turn on at 35C (SetpointActual) and turn off at 29C, the hysteresis value (HysteresisActual) would 6. This is programmed very simply in the first unit that I received:
SetpointActual = SetpointProgrammed = 35
HysteresisActual = HysteresisProgrammed (P1) = 6
OffActual = SetpointProgrammed - HysteresisProgrammed = 35 – 6 = 29
However with second the unit that I received, this is not the case. If I want a fan to turn on at 35C (SetpointActual) and turn off at 29C, the actual setpoint and hysteresis are NOT the same as the programmed setpoint and hysteresis. It is actually programmed as follows:
SetpointActual = SetpointProgrammed + HysteresisProgrammed (P1)
HysteresisActual = HysteresisProgrammed + 1
So to determine the values to program into the unit:
SetpointActual = 35
OffActual = 29
HysteresisActual = SetpointActual – OffActual = 35 – 29 = 6
HysteresisProgrammed (P1) = HysteresisActual – 1 = 6 – 1 = 5
SetpointProgrammed = SetpointActual – HysteresisProgrammed = 35 – 5 = 30
Thus, oddly, a programmed set point of 30 and a programmed hysteresis of 5, will actually turn ON my fan at 35C and turn it back OFF at 29C. This does work, but it is very cumbersome and definitely not intuitive at all. Since these units are not very expensive, and I cannot return it, I may just throw this in the trash and order a new one in hopes that it matches my first unit. I have 2 of these installed in my entertainment system, and I would like them to be able to be programmed in a similar fashion, preferably in the more straight forward manor.
If I received 2 units like the first, I would rate this 5 stars. Because of the frustration, inconsistency, and poor implementation of the second unit, I’m giving a combined rating of 3 stars. Unfortunately, when ordering cheap Chinese electronics like these, I think there is only so much that one can expect.
Hopefully this was at least of some assistance anyone that has been similarly confused by these temp control boards.
When setting up the new unit, I first noticed that there were more available parameters. Instead of 7 parameters (P0 to P6) this one has 9 parameters (P0 to P8). P6 is stuck at a value of 1.1 and can’t be changed regardless of the value of P0. P7 has a default of 50.0 and P8 has a default of C. I have no idea what these parameters do. Leaving these 3 parameters with their default parameters I marched ahead with the setup, programming in the same values as are in my existing unit. I quickly noticed that it was not behaving as expected. So, I uninstalled the unit form my entertainment center and did a little trial and error on a bench top. I was able to determine that the programming of the set point and hysteresis values were NOT the same between the 2 units.
For example:
If I want a fan to turn on at 35C (SetpointActual) and turn off at 29C, the hysteresis value (HysteresisActual) would 6. This is programmed very simply in the first unit that I received:
SetpointActual = SetpointProgrammed = 35
HysteresisActual = HysteresisProgrammed (P1) = 6
OffActual = SetpointProgrammed - HysteresisProgrammed = 35 – 6 = 29
However with second the unit that I received, this is not the case. If I want a fan to turn on at 35C (SetpointActual) and turn off at 29C, the actual setpoint and hysteresis are NOT the same as the programmed setpoint and hysteresis. It is actually programmed as follows:
SetpointActual = SetpointProgrammed + HysteresisProgrammed (P1)
HysteresisActual = HysteresisProgrammed + 1
So to determine the values to program into the unit:
SetpointActual = 35
OffActual = 29
HysteresisActual = SetpointActual – OffActual = 35 – 29 = 6
HysteresisProgrammed (P1) = HysteresisActual – 1 = 6 – 1 = 5
SetpointProgrammed = SetpointActual – HysteresisProgrammed = 35 – 5 = 30
Thus, oddly, a programmed set point of 30 and a programmed hysteresis of 5, will actually turn ON my fan at 35C and turn it back OFF at 29C. This does work, but it is very cumbersome and definitely not intuitive at all. Since these units are not very expensive, and I cannot return it, I may just throw this in the trash and order a new one in hopes that it matches my first unit. I have 2 of these installed in my entertainment system, and I would like them to be able to be programmed in a similar fashion, preferably in the more straight forward manor.
If I received 2 units like the first, I would rate this 5 stars. Because of the frustration, inconsistency, and poor implementation of the second unit, I’m giving a combined rating of 3 stars. Unfortunately, when ordering cheap Chinese electronics like these, I think there is only so much that one can expect.
Hopefully this was at least of some assistance anyone that has been similarly confused by these temp control boards.
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Reviewed in the United States on December 25, 2016
