DROK Electronic Thermostat Controller, DC 6-30V 24V Digital Temperature Control Board -50 to +110 Degree Celsius High Accuracy LCD Digital Micro Temp Control Switch Module with Waterproof Sensor Probe

Quality seems to be good, and it's easy to configure. Wish it could switch to fahrenheit, but it's not a big deal because you set it and forget it. When you cut power to the controller it retains the settings. We're using it to control a small ventilation fan for the electrical compartment in our camper, and it's been working flawlessly! Small size, great value!

I used this for a power supply cooling fan controller in a 3D printer. Easy to program, and works great. I had to work some tweaks with the cover so that it could be mounted to it and still be programmed and read from outside the enclosure, but it worked out well enough as it's not something that needs to be changed much - if at all - once it's set. I would have preferred if the display and operator buttons were arranged so the card could be mounted directly to a panel face, but it is what it is.

So far the only complaint I have about this this is the utter lack of any sort of documentation on how to use it. Other than that, it has worked great for the 45 minutes I spent playing with it.After a few minutes playing with it, however, I figured out how to use it. Here's the scoop, in case this helps anyone:1. Run power to the +V/-V pins on the terminal block. I used a 12V power supply and everything worked.2. Connect the thermocouple sensor. Mine came connected so you may not have to do this.3. Connect the thing you want to control on the other two pins on the terminal block. It's just a relay aka switch, so it doesn't matter which lead you put where. That said, the unit DOES NOT SUPPLY POWER to the device you are controlling, so you have to treat this as a switch. That is, run one power lead (say, +V or "hot") to one of the switch pins on the thermostat, connect one end of your device to the other pin, and connect the other lead of your device to the other power lead (GND, -V, or "neutral")4. Power up everything. The thermostat will need to be set before it does anything. This is really easy but undocumented. a. press SET until things start blinking. b. the bottom line will say C or H, followed by a temperature. C means "cool to stay under this temperature" and H means "heat to stay above this temperature". Press SET until the C/H indicator is blinking, then UP or DOWN to change between C and H. c. press SET again so the temperature to the right of C/H is blinking. Press UP or DOWN (you can hold these down to change values rapidly) until you get the temperature you want. If you selected C, this is the temperature where the relay will OPEN i.e. stop running your fan/cooler/whatever when the sensor cools down. If you selected H, this is where your heater/whatever will turn OFF. d. press SET again until the top temperature blinks. This is the "hysteresis" temperature. Basically, this thing controls where the relay will CLOSE i.e. turn on your fan/cooler/heater whatever. KEY THING TO UNDERSTAND: the hysteresis temperature is the difference between the "ON" point and the "OFF" point. Example: if you pick C20.0 on the bottom line and 5.0 on the top line, the thermostat will operate in Cooling (C) mode. It will turn on the cooler at 25*C (77*F) and it will turn off the cooler at 20*C (68*F). It will always try to keep the temperature between 20 and 25. Another example: if you pick H10.0 on the bottom and 10.0 on the top, it will be in heating mode and will turn on your heater at 0*C (32*F) and will turn it off at 20*C (68*F). If this doesn't make sense, just remember that in cooling mode it will keep the MAX temperature below the bottom PLUS the top value, and in heating mode it will keep the MIN temperature above the bottom value MINUS the top value. The larger the top value, the larger the allowable swing in temperatures, and the longer time your heater/cooler/whatever will be operating while it is doing its thing. That said, it will also run with fewer starts/stops, so that may be good for the lifetime of the heater/cooler/whatever.

Using this to prevent charging when a LIFEPO4 battery is cold.Set the unit to the C mode for cooling and set the temp to 4 degrees C. With this setting, when the temp is above 4 degrees C, the relay will close to allow the battery to charge. It will work for months just fine, and then reset the C mode to the H mode for no apparent reason. I have seen this happen on two different units.Is there a solution to this issue?

Solid unit. Good visual on the LCD screen. Programming good, instructions leave a bit to imagination. Not real clear how to set the hysteresis of the on/off cycle. Light, powers up and stores settings. Handy.

It is a cute PCB module. A simple menu is easy to set up. Recommended.

I'm having a hard time programming this i need help or better instructions. When I set the temperature to 30c and the second to 28 c it wont work. Only if I set to 30nc and next one to 9 c will it turn on. Before it worked now all 4 boards do this. Did i.mess up can u please explain the abbreviation in menu what they are or email me better understand programming. I press set fast then select c then 30c then next setting 28c it worked now second has to be set to 9c or 7c or it wont work at 28c it wont come on till 50c one of these failures fried my expensive electronics boxes because it overheated. This module failed for some reason. I followed instructions but confused about acronyms or abbreviations because I do not know what they stand for alarm I figured out . Help please. I have lost 3,000.00 worth of equipment already I do not need to lose more from over heating . I'm removing all of these and putting switches on the cooling fans till resolved. When these worked my system was cooling to 28c or 30 c even when heat was 98 f outside

Came very timely and worked as expected.