HiLetgo 2pcs W1209 12V DC Digital Temperature Controller Board Micro Digital Thermostat -50-110°C Electronic Temperature Temp Control Module Switch with 10A One-channel Relay and Waterproof

Bought these (only in fact needed one) to control solar powered ventilation fans in my greenhouse. Can be configured to operate in cooling (on when set temperature exceeded) or heating (on when below set temperature). There's a couple of degrees hysteresis so it won't oscillate too much. The LEDs show the current temperature and it seems fairly accurate. The temperature probe supplied has a reasonably long lead and is potted into a metal cap, making it waterproof (the board itself will of course need protecting in a box).Configuration is simple, albeit a bit tricky to figure at the start I found. It essentially comes down to up and down buttons to set the trigger temperature. The settings are non-volatile so survive power loss.Was a bit concerned about the current drain given I'm using it in a solar/battery environment. However, even though it has pretty bright LEDs they have minimal drain on my small Li-Ion pack (not enough to discharge it over night anyway).

Really small board all that’s missing is some clear instructions, connected it up to turn a cooling fan on in my av cabinet and 2 days in it seems okay

Am using them to operate cooling fans so only light load but they work well and have many settings

Used to automate a fan heater in a campervan, turns on when there's enough heat to transfer turns off when it gets cold, perfect.

The w1209 is SO good. Very easy to use especially if you want to make your own egg incubator.

works well but would be better if instructions were included

Works well with https://www.amazon.co.uk/gp/product/B07CM1PQNS/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1

Workes great when you finaly manage ro prigram it youtube gave good set up videos

I got these as extras, for temperature sensing only. The more I explored them, the more I learned that they are extremely well designed, well thought out and very well built, in spite of their unbelievably low price. Documentation is spotty, with conflicting, confusing and otherwise poor documentation all over the internet. The good thing is that they are widely used, so there is a wealth of information and field experience out there; you just have to sort out the truth from the garbage.I will be using these on a remotely located solar installation, to keep my Li-Ion battery bank from freezing. I plan on doing a lot more testing to make sure these units are up to the task, but so far so good.

funzionano alla grande

Control de temperatura de un Inversor Vcc/Vac.

Les températures mesurées sont inexactes. Les deux thermostats que j'ai reçus ont le même problème : même dans un environnement à température constante et contrôlée, les températures varient en continu de +/- 3°/4°C en quelques secondes. J'ai demandé le retour des produits achetés.

Works exactly as specified. I use it to control an electronic solenoid connected to a tap which turns on a mister in my greenhouse if it gets too hot. Easy to program too