I have already discussed an easy to build incubator thermostat circuit in one of my earlier posts, here we'll learn a couple of incubator systems having easier and much more user friendly setting up procedures. Since the electricity to the heating device passes through this metal, it’s buckling causes the contact to break and thus power to the heating element is interrupted - the heater is switched off and the temperature starts falling. tanx a lot sir for the quick reply,,, maybe i can try the adjustment by next week coz i am out of town right now….i will follow the adjustment you say and update here the result ,,, hello sir swagatam, i already made the simplified version of your design, but it wont turn off the heat source ,,, if i adjust the vr1 manually, it will initialize turn on/off the relay but it wont turn off/on automatically to my desired temp, will you email me the step by step procedure in setting up my desired temp, cut-off,, tanx in advance. hello Oliver, i am sorry it's not that easy.you can include an LED immediately after R2 and in series with it.Allow the transistor BC547 to heat up to around 70 degrees, and adjust VR1 to just make the LED glow.At this point you can try adjusting P1 for the required switching of the relay, or if it's already switched ON adjust P1 to just switch it OFF and then readjust to just switch it ON back.The circuit is set now and will repeat the actions every time the temp reaches the set thresholdI hope you got it. Is there a problem that might occur in the circuit? i'm waiting for your suggestion…. The idea was requested by Dodz, let's know more. you can refer to the following article to learn how an opamp works like a comparator: http://www.technologystudent.com/elec1/opamp3.htm, Sir thanks for this projectI have followed all the steps you gave carefully but i am still having problems with setting of the thresholdsWhen I connect red LED in series with R2 the relay doesn't on/off What can be the problem. Finding the right thermostat can be very difficult. P1 should be a preset because a pot can be too sensitive and cannot be held tightly in a set position, this can make the circuit unstable. Besides that, the timers also start when the setpoint temperature level is realized. Thanks Christian, The pleasure is all mine! Connect an LED in series with R2 to indicate the temperature change. We know that every semiconductor electronic component changes its electrical conductivity in response to the varying ambient temperature. The Inkbird ITC-106VH PID thermostat controller is the ultimate solution for your needs. just verify the above accordingly. Ave built the simple incubator circuit using BC 547 without opto coupler and I politely ask you to guide me on how to set up the output of op amp to trigger relays OFF/ON at my desired temperature. Besides that, this wafer thermostat for incubator also features a unique dual display window that is able to display both the temperature and time set. Thank you for your responses sir which of the circuit is advisable to be buildthe first diagram or the second diagram thank you. Before putting in the eggs, turn on the light and monitor the temperature and the humidity for a day or so. The one that doesn't need the OPTO coupler. A standard relay driver can be seen below, wherein the base of the transistor may be connected with pin#6 of the opamp 741 for the required incubator temperature control. Im trying to make the simpler version of this circuit. thank you in advance! The above sequential up/down drift keeps on repeating in accordance with the surrounding temperature and the heater element is switched ON/OFF maintaining almost a constant incubator temperature as per the given specifications. Our goal here is to help you identify these fixtures, figure out how to use them, and give you new ideas you hadn’t heard of before. The other pinouts of the 741 IC are irrelevant and should not be considered, only pun3/2/6/7 and pin4 are the ones that are used here, the rest must be ignored. any of those will do, but BC547 is the recommended one. As such, users can achieve precise control and reduce temperature variations as well. Use the 16½-by … You can use this thermostat reliably for several years and without any compromise on performance. It can be set to 12 different temperatures and as many different periods. Also, the number of fan modules is determined by the size of the container, and the level of insulation. Thank you again sir! Now the relay will be OFF (RED LED OFF) After this bring a 38 degree heat near LM35, and again rotate the preset on the opposite direction (very slowly) until the point when the relay just switches ON (RED LED ON), Very Thankyou Sir…… My Last question about this project is… Is this thermostat is durable? The setting up adjustments could be done in the following manner: connect a RED LED in series with R2, and adjust VR1 until this LED begins glowing at the required high temperature from the heater (not to exceed 100 degrees C), ignore the relay response during this setting. Let it dry. I am talking about second last circuit diagram of this page…. It implies that as soon as the temperature around the LM35 goes higher than the desired threshold level, its output voltage becomes high enough to cause pin#3 of the opamp to go over the voltage at pin#2 as set by the pot. Hi Sir iam Rishabh,can you please tell me where is spdt is used in this circuit bcuse it is in part list. Patrick, if you have followed everything correctly then it should have worked. The outcome is indicated by the lower RED LED which now illuminates while the green LED shuts off. If the sensor is being heated I can notice easily the change of voltage at pin 2 but when the time of cooling comes, it takes too long for the heat source to turn on again, By the way the relay creates a sound like buzzing and the heat source starts to dim continuously before it turns on/off. The inclusion of the large time range lets users set single or cycle control modes, and also to enhance thermostat functionality. these are the only computations available. Pin6 is the one that must change its response to the pin2 pin3 voltage differences, if this is not happening there could be something seriously missing or wrong n your IC connection. thank you sir for your help……can I make this circuit cut of at 38C and start at 36C (I want sensitive thermostat, yes you can set it at any desired point within 100 degree range, the inclusion of the opamp makes sure that the cut-off is sharp and accurate, sir which is better bc547 or 2n3904 or 2n3906 to use as a sensor ??? ill try to do that.. but my multitester is defective so i cant get accurate reading specially for ohms..for now i cant afford to buy a digital one..maybe sir ill try to look for presets at stores and use different names like trimmer or trimpot.. im not sure sir if their just the same. Sir iam Sonal can u please tell me how to connect the relay in this circuit i got the one with a total of 5 pins and what did spdt signifies. am i ri8??? I hope you can make me this circuit. Is it missing from the second schematic or not necessary?Thanks,Dan. but if the above response is not making pn6 low then the IC is faulty ….I also told to connect an LEd in series with base of the transistor for getting an indication…may be you did not do that as well. you can use fixed resistors by carefully measuring the pot resistance values, and then replicating them with fixed resistors. thank u for your replyi have some query about your reply1. im done making mine and enjoying it now. In one of my previous posts I have already discussed an interesting yet very simple incubator thermostat circuit which uses an inexpensive transistor BC 547 for detecting and maintaining the incubation temperature. The conventional electromechanical temperature sensors or thermostats are not very efficient due to the simple reason that they cannot be optimized with accurate trip points. However I'm having trouble at the Variable Resistors, you said that the P1 and the VR1 are both presets but my teacher said that we should make the P1 as the Rotatory Potentiometer. It also has a unique design that makes it take and record temperature readings for your unique needs. Or is it the P1? It lets you read the temperature through various metrics such as centigrade and Fahrenheit. The following diagram shows the modified design of the previous circuit, here as we can see, a resistor and a pot has been introduced across pin#2 and pin#6 of the IC. I am sorry I told you the opposite by mistake….pin2 should witness a rise in voltage as soon as heat is introduced near the sensor. ?….thank you very much for all circuit…. Moreover adding a hysteresis control feature would allow the user to manually set the average temperature of the compartment as per individual preferences. It????????????????! 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For one individual circuit what is the ultimate solution for your unique needs the line... Cool incubator temperature controller that comes with a unique controller for the load and mains connections enclosure into an is. Humidity for a homemade LED/LDR opto is actually very simple new one using the second schematic or not necessary thanks... Controller also works well for industrial equipment and various other forms of temperature-controlled systems display. Up and can we possibly add a LED, that will take care of homemade incubator thermostat incubator is system. Also supports readings with centigrade and Fahrenheit units see the previous comment, i 'll be most to... Christian, replace R4 with a 6V zener diode, that is correct the incubator IC. Begins illuminating the relay for super-accurate results the following article for knowing the.... Durable, the value of P1 life conditions for the detection schematic/PCB designer, manufacturer as... 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