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Temperature monitor and alarm

11/4/2016

4 Comments

 
This was one of those projects that should have taken an afternoon and didn't, however it's now complete and working rather nicely.
Picture
I already had a box from a defunct project that had the 4x20 LCD display installed and power switch, mains transformer and a mains IEC socket on the rear so I decided to re-task it for this.

Inside is a PIC18F25K22 running this show, and the device can monitor up to three channels. Each channel has a 5-pin din connector and cable that connects to a Maxim DS18B20 temperature sensor.
You can set the alarm temperature independently on each channel, and the project starts beeping and flashing the LCD backlight if a maximum is exceeded. I also included a relay that can be used as a power interrupter for the project under test. This way I can leave a project on soak but if it starts to over heat, the power can be cut automatically.

The reason it took longer than anticipated was for some reason the PCB never etched correctly and I had some messing around to do. The software only took around an hour to write and debug. I love Proton BASIC.

...and the reason it's three channels and not more, well I happened to have three 5-pin din sockets in my junk box. If I'd had more... who knows.

If anybody is interested I'll make available the circuit diagram, PCB foil and PIC firmware but this really is an easy project to design and build.

So, now that's up and running, I can get back to the original task of designing a decent voltage boost converter.

4 Comments
Brian Clark link
14/6/2016 02:31:05 pm

Hi. Can you put the Hex File and PCB layout on line for me so that I
can make this project. I am makeing two off your projects but I have
not a lot off time but hope to finsh in the next 3 or more months.

The porject I am looking for is the ( Temerature Monitor and Alarm )
Thank you Nice work And web page is for me 100% one off the best.
From Brian Clark.

Reply
Danny
3/8/2016 11:11:56 am

Hi,
£I'm starting a project with a PIC18F25K22. This is new for me . I see that you made an project Temperature monitor and alarm which is based on a PIC18F25K22 as well. Can you send me the code of this program as an example for me. (if possible also the
circuit diagram)
thx's
Danny

Reply
boobeshkannan link
12/12/2016 06:31:39 am

thanks for sharing your idea about the temperature monitor many things are there to monitor the temperature but i used your idea

Reply
Douglas
15/1/2020 06:20:21 pm

this temperature project looks interesting. Do you have schematic and code available if so email will work.

Reply

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