It should have a buzzer go off at a time dependent on the temperature of a liquid. The temperature-time relation is linear. It also has to have few components (not 20 op-amps).
2006-11-12 07:39:10 · 2 answers · asked by Elizabeth D 1 in Science & Mathematics ➔ Engineering
How about using a LM555 timer, but instead of fixed resistors use a thermistor for the timing element(s). You will have to look up the parameters of a thermistor and set up the other resistors on the 555 timer to give the operation that you want.
2006-11-12 08:06:24 · answer #1 · answered by rscanner 6 · 0⤊ 0⤋
Well simple:
Components:
Temperature sensor - J or K thermocouple should do you well on this. This will not be linear btw, but you will have to "make" it linear in the code that you write.
Microcontroller - I think a PIC micro should be good for this project w/ an A/D convertor. Most of the PICS at the higher end have built in timers.
Buzzer - Any buzzer will do
Hook them up all together, program them and voila!
2006-11-12 16:50:59 · answer #2 · answered by Anonymous · 0⤊ 0⤋