hi everyone
im trying to get into doing some more tinkering with electronics like i used to a few years ago. i would like to build a circuit but need some assistance and would be greatful for any help or a finger point where i can read up what i need to learn.
basically i want to build a circuit that measures a temperature and then once a cirtain temperature is reach, an LED will come on. this is simple but ive not done anything like this since school/college
so, the temperature sensor is 12v, and all power that is available is 12v,
i would like the point that the led comes one to be adjustable.
the temperature reader is an auto one but still a thermistor right? more heat = less resistance?
once i have done this and tested it working, i would like to place a test button for the led, and hopefully improve the design so that the led starts flashing slowly at a lower temp and more quickly as the temp raises.
the problem i can see is that the temperature sensor will start to earth the 12v feed as it heats up (making a temperature gauge show an analagoue reading. i didnt want to power this circuit off this 12v source anyhow.
thanks for any help![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
im trying to get into doing some more tinkering with electronics like i used to a few years ago. i would like to build a circuit but need some assistance and would be greatful for any help or a finger point where i can read up what i need to learn.
basically i want to build a circuit that measures a temperature and then once a cirtain temperature is reach, an LED will come on. this is simple but ive not done anything like this since school/college
so, the temperature sensor is 12v, and all power that is available is 12v,
i would like the point that the led comes one to be adjustable.
the temperature reader is an auto one but still a thermistor right? more heat = less resistance?
once i have done this and tested it working, i would like to place a test button for the led, and hopefully improve the design so that the led starts flashing slowly at a lower temp and more quickly as the temp raises.
the problem i can see is that the temperature sensor will start to earth the 12v feed as it heats up (making a temperature gauge show an analagoue reading. i didnt want to power this circuit off this 12v source anyhow.
thanks for any help