Electronics Schematic for a temperature display ?

Hi as my electronics project i have decided to build a display with a LED segment display output. I was wondering if anyone had or knew where to get a schematic for one a if possable one that uses indevidual smaller modules rather than 1 chip to do everything.

Thanks
Danny

 

go on over to the 'linear's IC workshop' sticky thread, and check out the LM35 entry.

 

Thanks linear but as its a project i need it to be more complicated than just that

The "silly bus" asks for at least 3 active devices within the circuit.

My teacher said about using something with using a counter counting up voltages at a 0.1v increase then link that into an digital to analogue converter then using a comparitor i can't really remember everything he said but it went something like that

 

The LM3914 is basically 10 comparators, so you can duplicate its functions with the individual chips, using as many or few as you want output points.

A diagram's been posted here many moons ago, but all you need is the voltage output from the LM35 across a long chain of resistors, with a comparator at each junction arranged to switch a led on at a selected voltage level.

Work out the schematic from the LM3914 internal structure diagram in the datasheet - there the individual resistors/steps are all the same, but you can have any scaling to suit.

 

do you mean an LED bar graph, or an LED numeric display?? If you want the numeric display (tis much cooler!), Maplin sell one as part of a PIC package for £9.99, comes with a circuit board and all the parts you need. Order code is (FX25C). They did another one with a PCB using a 7107, but I think they've discontinued the PCB which is a shame!

g