Projects › Projects › Problems with the project “Celsius and Fahrenheit scale digital thermometer using 8051 microcontroller (AT89C51)”
- This topic has 9 replies, 7 voices, and was last updated 10 years, 2 months ago by tulip.
May 12, 2011 at 6:56 am #924JulioParticipant
The project can be found here:
A classmate and I are trying to build this thermometer for a project, so we bought all the components and built the circuit but when we tried to feed it the 5V it needs, the source we were using went into short circuit. We double-checked to see if any cable was causing the short circuit but found nothing, so we tried adjusting the current of the source and it worked, but then it started to smell like plastic burning and found out the LM35 was extremely hot!
We thought we went a little overboard with the current, so we tried lowering it a little but the source kept going into short circuit!
We saw in the video that they have the LM35 in an entirely different Protoboard, and we were wondering if that may be the problem, because we have the circuit with the LM35 and the ADC in the same Protoboard, connecting with the 8051 and the LCD kind of like in the video.
We also changed the code of the 8051 a little to make it easier for us to build the circuit, but I don’t think it should matter.
So if anyone here has a comment, suggestion or advice on what may be the problem or what could we do to fix it, we will be very grateful! Also, we are going to keep working on it ourselves, obviously.May 13, 2011 at 8:27 am #6185JulioParticipant
It seems the LM35 was misplaced, we flipped it and it stopped getting hot. But still nothing is showing on the LCD! We even changed back to the original code and re-wired some stuff to make it as similar to the video as possible, but nothing yet.May 16, 2011 at 1:31 pm #6242kinzaParticipant
i also need tempertaue sensor 2 digit 7 segment display code in 8051 plzzzzzzzzzzz help meMay 17, 2011 at 4:54 am #6250dagakshayParticipant
But still nothing is showing on the LCD!
what does this mean? you are not getting any display on LCD of not getting the output from LM35??
see nothing will com in first time, there might be some loose connection check it one more time.May 17, 2011 at 4:58 am #6251dagakshayParticipant
link for temperature sensor (julio has already give that)
link for seven segment
what is seven segment
seven segment interfacing with 8051
http://www.engineersgarage.com/microcontroller/8051projects/interface-seven-segment-AT89C51-circuitJanuary 8, 2012 at 7:38 am #7008Muhammad RaheelParticipant
julio i have same problem as u have friend the lcd show nothing .u have any idea about coding that coding is right or not ?plz tell me the of celsius into farhenheit which is in c language is ok or not?January 8, 2012 at 8:18 am #7009Mayur NirmalParticipant
Julio.. I think ur ADC should not be working properly..!! Check the input voltage to the ADC and test whether the controller is getting the proper input or not..!! i mean if the reqd current and voltage levels are not syfficiently met then controller will not be able to send the data out there to LCD..!!
or otherwise check ur LCD interfacing program whether u hv initialised the LCD to its proper configurations or not..!!February 7, 2012 at 8:50 am #7118Muhammad RaheelParticipant
sir plz email me the writing work or documentry of this project i am very graetful for you…………………[email protected]
and i face the problem in lm35 temp sensor variation then ref voltage how i amplifit voltage of lm35 outputApril 5, 2012 at 4:09 pm #7394krishna p sParticipant
there is a small change in the program…. just change the dataport initialization to P2.and in the circuit connect port p2 to LCD. YOY CANNOT USE PORT P1…AS IT IS OPEN DRAIN…..March 19, 2013 at 8:52 pm #9349tulipParticipant
even i m facing this problem of lcd not showing anything….plz help me out…
- You must be logged in to reply to this topic.