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I have never built anything electronic before, but after glancing at the tutorials, i would very much like to build a temperature alarm with an adjustable set point. If temp. drops below set point, an alarm goes off.
If i can accomplish this, would like to take it one step further. If temp. drops below set point, an alarm goes off and makes a telephone call to pre determined number. Any help getting started would be greatly appreciated, thanks.
Try using - LM335 [directly calibrated in kelvins]- LM35 [calibrated in centigrades]
I'm sorry, i think i may have mis conveyed the message....they come 'pre-calibrated'... meaning the voltage change is directly proportional to the change in temperature in kelvins/centigrades.and their response is fairly linear over a good range of temperature. yet you still may need the ambient temperature to calculate the error and subtract/add from the original value though...so maybe you are right , sir, for a beginner it may pose issues.
Starting simple there's a chance to comprehend the stuff and thus learn. Starting just a shade to complicated, there's a real chance of failure and quitting the hobby.