Need help with temperature sensors

azakuri · Joined: 02 Aug 2008 Posts: 4

i'm using 2 temperature sensor and i need to subtract both temp sensor so that i can display the result on the lcd. i'm using pic16f877. anybody can help me with the coding. i;m totally lost right now...

ECACE · Joined: 24 Jul 2006 Posts: 94

Not sure what type of temp sensor you are using. There are I2C, SPI, and simple thermistor types. You need to determine that first. If I remember correctly, some of the I2C and SPI types give back a calibrated temperature. I may be wrong on that, but I think there are devices that do that. If it is a thermistor type, you need to get the datasheet for the particular thermistor you are using. The thermistor is just a variable resistor, so you will have one side of it tied to ground, and the other to Vcc via a resistor. You will then just do an A/D reading of the device.

For the Code part, look in you Examples directory at the ones that start with EX_ADxxxxx, and EX_TEMP. This should give you a couple ideas of how to do it. Good luck.
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milkman41 · Joined: 16 Jun 2008 Posts: 30

What temperature sensors are you using?

azakuri · Joined: 02 Aug 2008 Posts: 4

I'm using 2 DS18s20. DS18s20 of temperature sensor. During my studies i was not taught about the pic so, I'm a little confused when i need to use it for my project. I'm not a good programmer and i need ur help with the coding. One more question, both coding for lcd and temperature can be combined into one sheet or not. Just asking. Could anyone help me with this... Sad

dyeatman · Joined: 06 Sep 2003 Posts: 1934 Location: Norman, OK

So this is a school/study project... Generally folks on this board will be glad to help you but typically they will not do your project assignment for you. That is why it is called YOUR project assignment. As an instructor I want my students to learn by doing NOT half-learn by someone ELSE doing!

To get decent help you must understand that people here (or any online board for that matter) are not mind readers and you need to give them something to go on or they cannot help.

Typically you start by posting:
1. version of your CCS compiler (the format is x.xxx)
2. which PIC chip you are using.
3. FULL description of your hardware (including the programmer)
4. what you are trying to do then a good description of the problem.

Apparently you don't even know what a PIC chip is so we can't do much to help you until that is settled. If you don't have or know these things you need to get with your instructor and figure that out first. That is what your instructor is paid to do...Help!

When you have the info come back and lay it out then things can progress much faster!