How to use W1209 Temperature relay controller and program the thermostat

hi welcome to Robojax in this video
I’m going to introduce this w1209 temperature control module. This is one
of the best and easy to use module that you can get. It doesn’t need
anything else like Arduino or anything it has a temperature sensor so you can
connect it here and it’s about 50 centimeter so you can control a
temperature and the temperature is shown in real-time and it works with 12 volts
so ground on 12 and then you can connect your AC load whatever you have let’s say
a heater a fan or any other device that you want to control with the temperature
so one way to use this one is that you are setting your temperature the desired
temperature at let’s say 58 degrees Celsius and the current room temperature
is 20 or 30 whatever is the liquid that you are measuring so when the
temperature reaches at 58 the relay will turn on and will connect your fan and
the fan will blow until the temperature reaches back to lower than
desired value and it will keep the fan off again so the other way would be to
put it the opposite for example you have a heater and you want to keep something
warm to 58 and not more than that so, in that case this will keep the
load on until it reaches to that temperature that you are looking for
let’s say 58 we need to reach is 58 degrees it will turn this off and disconnect the load (from power) for you so this can be said very easily we have three
buttons here: that’s the Negatively, Positive and Set now I’ve connected it to 12 volts DC so
the temperature that is currently showing is the room temperature and if you disconnect the sensor from the device you will get LLL so it that also helps
you to know that the sensor is disconnected if you’re
using longer wire. Now to set certain temperatures Press this it’s
blinking now you can go up and down with us when we press it harder so let’s say
you want to set it at 80 degrees so just leave it it and returns back so that is the
temperature that you’re setting a simple as that. I’m going to connect an AC (or DC)
load here to turn the AC load on and off with this one and after that I will
explain some other features of this for different purpose let me explain the AC
bulb here so this is a table light that is connected to the wall outlet and then
the wire goes and will be turned on but I have disconnected one of these two
wires here so let me show you so I’ve just cut this
wire from here now this can be connected to the relay. The relay’s job is to just
connect it so it will be ON and disconnect it will be off I’ve just
twisted them and then put some solder so this can be inserted into a (relay) connector
with a screw to correct your load you will connect the two wires in here so
doesn’t matter which one is which so we just connect the two wires that you’re
coming so in my case I’m gonna click this here now the AC load is connected and there
is power going for the bulb bulb so I’m just putting it aside so you
can see it so I’m using the heat gun (from Canadian Tire store) to heat this up and the sensor is here. As you saw to check the temperature that you that you have set
just press this button and that’s 80 degrees okay so it just disappears now
I’m heating this up and just pay attention at 80 degrees that bulb will
turn on okay so it just went even 88 so it stays
on until the temperature reaches back to around 80 and at 80 it will turn OFF so pay attention at what temperature it
goes off it should be a 77 okay. Now using it in reversed where the load is ON but goes OFF when it reaches your desired temperature. Will be explained. to keep it on I
reaches that temperature it will go off so let’s see it was 80 degrees and now
I’m applying some temperature so you can see that it will go off you see at 80 it went off because we use it in the opposite way when we set it to heat this has another feature that you can
set this up when the temperature goes down it does not react immediately so
you can set let’s say two degrees or three degrees or they call it a backlash
so backlash temperature is the amount of temperature that you set when it goes
down it should go just below that temperature then turn off so you can set
the at zero or up to fifteen degrees I set this at three degrees which I’m going to
show you so let’s have a look at the specification of this one they say that
the temperatures that it can control is from -50 to 110
degrees Celsius the resolution is from minus 9 to 99 at 0.1 degree Celsius so
above this temperature it might be a little different but will be between
these two ranges 0.1 degrees which is good. The resolution at all temperature
is 1 degree so above this it will just jump at 1 you will not see that say 105
point something so it goes from 105 to 106. The major
accuracy is 0.1 this is the same thing as a resolution the
control accuracy is 0.1 so you can set exact temperature of 0.1
degrees Celsius refresh it is zero point five seconds (0.5) so in one second
it measures twice so the input voltage is 12 volts which is a very common
voltage that’s nice measuring input: so that is the probe
that they use and with zero 0.5% accuracy and then waterproof
sensor is 50 so waterproof so that you can submerge this into the liquid or
water and then one channel at 10 ampere so this is very important that you
cannot put heavy load through this and in static (not active) it will consume
35mA and when turned on it’s less than
65mA. It has some other features some code that will show down the screen
it shows P0, P1, P2, P3.. up to 5 so I’ll let’s have a look at this one this is setting
P0 heat and cold so let’s say you want to set this that a normal operation you
will set it such that when the temperature reaches a certain value the
fan will start working so this is one way the relay will be disengaged the
connection will not be established the other way would be that initially
this will be on like a heater and when it reaches certain temperature the
heater will shut off so this will be disconnected so let’s set that one hold
this button for more than a few seconds like 4 or 5 seconds and you will see
that P on the screen so now it’s P when it goes to P then you can press this
short that’s cold and then you can change it heat or cold so now pay
attention when I set it to heat and exit the light will go on now it when it
exits just wait so by default as if this is our heater and I want to keep it on
and when it reaches that temperature it will go off so let’s see it was 80
degrees and now I’m applying some temperature so you can see that it will
go off you see at 80 it went off because it’s
because we use it in the opposite way when we said it to heat so they see it if so let me change that P back to cold
so hold it and wait P0 hit and then change it to cold and exit wait for this
so it will change so now it’s changed now let’s say the P1 the backlash as
they call it to hold us so press now again sorry
press this plus button so P 1 now with your P 1 go and set it so it’s 3 degrees
so you can set it exactly at 0 or 3 or 4 or whatever you want so you cannot say
that 0 it can be set as 0.1 which is degree
so now let’s set the upper limit P 2 so hold this again when you see P go 1, 2
and then press set it so the upper limit is 90 degrees so you can change it
whatever you want P 3 so the lower limit so now I’m going to the P 3 the lower
limit so that is 30 so let’s say you don’t want to go below 30 so it will be
always showing 30 and now again let’s see that for the correction P4
when you are in P4 that collection is now zero or you can say
minus or plus some value and exit now press P5 that is a delay when it when
it’s turned ON you can set it. here it’s all set at 0 but you can set it at
that’s it that this is in minutes so six minutes
after the change happen it can react but let’s make it zero so it can react
immediately and then sex that’s the alarm so when you said I don’t go here
the alarm is now off if you set the alarm on it will give you the temperature for that alaram. Now
it’s set at 66 so when it reaches at 66 you will see the alarm so let me turn
that on there will be a three dash on the screen So that is a trigger of alarm it will
not allow that really or anything to work if you set the alarm value and this
will go back to normal when the temperature reaches below 66 so if I
hold this my body temperature will reduce it oh it’s hot yes this device is
made very versatile the relay, the contact if you look here on this side
I’ve been soldered very well so really you can when you connect it you know
that this will not rip this connector off so it’s very nicely done
also we have four screws if you are mounted on somewhere the only worry is
that there’s a switch or such that if you want to cover it you need another
mechanism to make sure that you are able to touch and make adjustments so these
are not in a good position but it’s very cheap you can get this from eBay or
Aliexpress and can do the job perfectly. thank you for watching please thumb up
the video share it and also subscribe to get updates of my upcoming videos thanks
for watching

100 thoughts on “How to use W1209 Temperature relay controller and program the thermostat

  1. এখানে হাসের বাচ্চা, মুরগির বাচ্চা, কয়েলে বাচ্চা, টারকির বাচ্চা, পাওয়া যায় ,এবং ইনকিউবেটর পাওয়া যায় 7908422621 Indian

  2. برای خرید ماژول W1209 در ایران به دانشجو کیت مراجعه کنید.

  3. hi. I have buy already 2 of these controllers and the problem is that when it gets to the set Temp the relay clicks (you can hear it) the small led from the right side of the display it lights but the fan that I've attache to K0 and K1 port dues not start and measure with the meter it shown no output current on the fan (K 0 and 1) circuit. I am use it on a 12V battery as a cooling circuit. what do you think the problem is? I am connecting it wrong or the circuit it is not function as it should be? the problem Is stressing me because I've already bout 2 circuits and the delivery time is of minim 2 months 🙁 Thank you for the advice!

  4. Can this relay circuit is use for Air Conditioner Temperature setting at 24° or above means if i want to set my AC temp. At 24° or above at that time power supply is given nd if temp. Gets low below to 24° relay tripp nd power is off…please give me suggestions or any idea about it

  5. Is it possible to calibrate to a car's stock temperature sensor? What are the electric specifications of the expected temperature sensor shown? I also would prefer Fahrenheit. I am glad to see the comment that it holds programming when power is off. Is it safe and calibrated if a car voltage changes 12v to 14v?

  6. Can I use it for Radiator cooling fan sensor. Fan should set off at 75 C and fan should set on when the temperature reached 85C. Pls give your reply.

  7. What will happen when the power goes off ? We have regular power cut in our area will it retain the settings

  8. I have often had a problem when I want to power this from a 12v regulated power supply… the temperature jumps up and down several degrees every second, and if the temperature is close to the the set point, the relay will randomly click on and off and on and off because of these fluctuations in the temperature reading. I tried using an additional 12v linear voltage regulator together with lots of different sized capacitors, and even tried lowering the voltage by passing it through a couple of diodes. Nothing really helped. My voltmeter was reading a constant 12.2 volts, so I don't think the voltage was actually fluctuating any appreciable amount, but whatever tiny bit of leftover ripple was left in the incoming supply was continuing to cause these fluctations in the temperature reading, and the unstable relay response would not stop. Initially the only thing that fixed the fluctuations was to run the thermostat from a completely separate 12v battery instead. (Not practicle for permanent installation of anything.) But then I tried something else that totally fixed all the fluctuations without having to run it on a battery: I put a small value capacitor across the leads for the thermistor. Works like a dream! No more random fluctations in the readings, and no more random clicking on and off of the relay! Perfectly smooth operation now. I used a 4.7 uf capacitor rated for 25 volts, but any small capacitor will usually work, as long as it is rated for 12v or more. So if you are having issues with a jumpy temperature readout, cut the thermistor wires somewhere convenient, and splice in a very small capacitor. Or if you would rather put the capacitor directly on the board, there are two nice solder points right next to the sensor connector you can use. The top side is positive, and the bottom side is negative. I tried a .1 uf capacitor and it worked just as well, but I went with the 4.7 uf because I might need the other one for something else. So the value of the cap is not hypercritical.

  9. NEVER tin tip of wire to be connected in a hole by screw pressure – the copper loses it's elasticity and and adapts so eventually the screw no longer apply pressure on the wire and the connection faults.

  10. hello sir i have bakery ovens with oven one temperature digital meter i won't one display in office cabin it's possible please suggestion

  11. Purchased one for my DIY Peltier Chiller. Both the Peltiers and the Temp Control run on the 12V. Worked out just fine.

  12. Hi sir robojax..

    Sir i bought this w1209 thermostat.. with this relay details.. 20a 14vdc, 20a 125vac, sra-12vdc-al… now my question sir is ds.. can i plug a 220vac bulb as my heat source for my incubator? If not, what shud u suggest sir so dat i can utilize ds thermostat since our place has 220vac source..
    Waiting for ur humble suggestion.

  13. Ty sir robojax… very informative.. very easy to install. Ordered another batch of this device for my incubator projects.. this is very useful for us beginners.. more power sir robojax…

  14. Sir. My adapter is 5amp 12v volt. My thermostat relay most of the time not working. Then i removed relay and replace with 7amp relay. It worked for one week. But the same problem is there.. relay not turn on…means heating bulb not turn on. When we hit the thermostat it will work and off automatically. But will not turn on again without hitting.. with 5amp adapter iam using 2amp dc fan too. Sir what will be reason for relay problm

  15. I need little expert help.
    My AirConditioner outside has a heat sensor when outside temperature is above 35 C it cools alot below 35C everything is fine as per its compressors working .
    Is there any way i can fix the temperature of sensor no matter how hot outside it gives the inside system temperature of 34C fixed any way possible ?

  16. Why cut the part you setting it up… ? What the hell is the video about then… except reading from spec

  17. One of the very few videos where somebody actually explains this things so clearly. I'll definitely give you a like.

  18. I'm after a circuit that lowers the voltage to a heating element rather that switching it on and off as this relay design does. This would allow me to have an element that keeps liquid at a very precise temperature (relay on off for a 1KW heating element, heating a liquid, means the solution heats and cools rather than being heated to temperature and is kept there by a warm heating element) Does such a circuit exist? If so I'd love to know… Cheers and thanks for the video

  19. kindly tell me how to check your device is working properly i've this device in my incubator and adjusted it on 37.5 but it don't stop at 37.5 it continues for even 50

  20. Sir, you have really made it easy and even easier but sir can one adapt six bulbs to the W1209 thermostat at a time?

  21. hi sir robojax.. sir, can you please help me setting up 2 blower fans in the incubator, one blower will turn off when it reaches desired temp then the other one fan will turn on.. ty sir robojax

  22. Also this video is not analysing the unit. The Voltage regulator is a AMS 1117, max input 15V. The relay could be replaced by a solid state relay, especially when switchiung ´motors. Why dont you mention sparks on relay contacts? Does the chip have an alarm output that goes high on alarm? (possible second channel?)

  23. There are no isolation slots on this board. I would say it is irresponsible to show this product being used to control high voltage.

  24. What is maximum temperature settings? Maybe I can use this in my old car for coolant temperature or engine temperature warning indicator.

  25. can anyone think of a reason why when its wired to 12v in, there is a loop from vd+ to K0, and k0 and k1 are wired to a 12v silicone heating pad, why the relay clicks and the led goes on, but there is not heat? i tried multiple w1209, tried the heater directly to power so i know it works., even tried a 12v fan… doesn't seem to be any actual power to k1 and 0 when there should be? the only way i can get it work is to have a separate dc power source to k0 and k1 without the loop.

  26. Hi. Thanks for the video. I have noticed that the thermostat in the incubator I bought is constant at 37.7 C but this thermostat runs up and down. What settings will make it remain at 37.7?

  27. Hi , you did not talk about the type of 12v power supply ? Trying to do this on a cheap … so what type of power supply do I use or buy ? I have some 110w to 150w desktop power supply …. I have a dell laptop 130w power supply ….. what can I use that is cheap and still work ? Give me an ebay item number of the cheapest power supply that will work …. ? Appreciate the help ! Thanks

  28. Hi,i want a thermostat to control my temperature for my peltier that works on 12v. What can I use for tgat,this thermostat would basically burn the peltier.

  29. Hi, please go to our store for POER smart wireless digital wifi boiler room thermostat. Привет, пожалуйста, зайдите в наш магазин для интеллектуального беспроводного цифрового Wi-Fi.

  30. How can I connect a 12v fan to go on and off with the bulb at the same tempature? I'm using a 12v adapter to power the fan and a 110v to power bulb

  31. I was thinking that it will be good to use for a mod a laminator for the toner transfer (the old back yard PCB making method) to make it work and tune the temp. up to 170-to-210 degrees Celsius but NO, unfortunately it does NOT work for more that 110 degrees so….NOT suitable for my intended use.
    Oh, what a bummer!!! I nearly went to buy it. but read the specs before pressed the buy it non button (luckily !!!) Nice video presentation as usual. Tnx.

  32. Can I connect this to a 12 volt battery 1.4AH? I intend to connect a small fan and small buzzer on a compact surface.

    I know it has a 20amp relay so im not sure if this requires more power to activate the fan.

  33. You just stopped me complaining to the seller on ebay because my one was working backwards to how I wanted (was on cool, not heat). Another great video, very glad I subscribed. Thank you 🙂

  34. I have a 2A power supply I have connected to it and then connected a 10w heater to it. It's not running, is the A enough or does it need 10A to work?

  35. my temperature is showing me – 29, -37 all the settings are working but the readings on the screen (-29,-37 changing form one to the other)is not and if i remove the sensor it will still be showing the reading, instead of it to stop, please can you help.

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