Little temperature sensor project: help would be nice

-Exodus-

-Exodus-

-Exodus-

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18 Feb 2008
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ok so i'm looking to build a temperature sensor and display to go in a 5.25" or 3.5" bay (depending on display).

i will be using a PIC based circuit, to be exact a PICAXE-18 combined with a DS18B20 (temperature sensor). i'm looking to display the exact temp (no decimals for now) and have a fan output when a certain temperature threshold is met.

for display i'm considering a 16x2 LCD alphanumeric display or a double 7 seg with 4020B driver chips.

i'm working on a circuit design currently for the 7 seg one, think i've almost got it but i'd like some help on the one for the LCD. going to be having an input of between 5 and 6V using a relay to enable an input of 9V for the fan.

any advice or guidance would be great. i'll try post my initial circuit design up.


and yes, yes i know i could buy one but just doing this for the fun and it's a cheap project.
 
Would it be easier to tie the temp sensor output to a pwm circuit? An increase in temp should give an increase in voltage which could be used in the pwm side to power the fan.
 
i've no idea anything about that, plus i already have the serial to circuit cable and a basic knowledge of PICAXE. it's just handier, i'm not even talking about a gradual increase in fan speed, maybe like 3 settings; off, low high?

EDIT: plus i can nab those components from school ;)
 
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