Elven Commander Posted March 13, 2005 Report Share Posted March 13, 2005 Hi all, I am making a digital temperature gauge and had a few questions. I am using a thermister to detect the change in temperature. I know that it sences change in temperature, but how do I make the circuit realize this? I'm not exactly sure how to go about this project. As of right now, I know I want to have 3 display panels (7 segment) show the temperature. I know how they are labeled and after some testing I have all of them working with the decimal point. I also know i need a driver/decoder chip for them to work. My display units are common cathode, so from what i've researched the 74LM48 is the driver i'm looking at. I have the datasheet for it, and know where to send my a-g to etc. What I wasn't sure about, is I have 3 display panels, does this mean I need 3 of the 74LM48's? Something tells me that would be terribly inefficient, but how would more then one number be presented at once on 3 seperate displays if you only used one driver?? Does anyone have any suggestions or direction of where to go between my thermister and the driver/decoder?? Thank you, EC Quote Link to comment Share on other sites More sharing options...
MP Posted March 13, 2005 Report Share Posted March 13, 2005 Most sensors are made to basically put out a voltage. What you are really making is a digital voltmeter. Yes, you will usually need a driver chip for each 7 segment display unless it is something like the 7107 which will feed multiple seven segment displays. You should look at the specific data sheet. You might want to take a look at the digital voltmeter projects in our projects section. There are a couple of them. This might help.MP Quote Link to comment Share on other sites More sharing options...
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