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Step 2Thermistors
Solder two wires to each thermistor.
On a breadboard solder on a 10k ohm resistor, one end will connect to the Arduino ground, the other to Analog input 1 and to one of the thermistor wires.
The other end of the thermistor wire connects to +5v from the Arduino.
Do this for another Thermistor and connect it to Analog input 2 instead.
Basically it is a voltage divider with the thermistor defining the Voltage going to the Arduino analog input. One analog divider for each thermistor.
I added the circuitry in a separate jiffy box where the thermistor leads could be screwed into inline screws protruding from the box.
To test this sensor, use a multimeter to look at the voltage change as you put your finger on the Thermistor.
On a breadboard solder on a 10k ohm resistor, one end will connect to the Arduino ground, the other to Analog input 1 and to one of the thermistor wires.
The other end of the thermistor wire connects to +5v from the Arduino.
Do this for another Thermistor and connect it to Analog input 2 instead.
Basically it is a voltage divider with the thermistor defining the Voltage going to the Arduino analog input. One analog divider for each thermistor.
I added the circuitry in a separate jiffy box where the thermistor leads could be screwed into inline screws protruding from the box.
To test this sensor, use a multimeter to look at the voltage change as you put your finger on the Thermistor.
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Jul 1, 2010. 2:06 PMwizworm
says:
Termisters have a problem of self heating (causes a false + temp), you should use a transister to drive the current through the voltage divider. This will add a duty cycle to the termister, give it some time to equalize measure then shut it off for the remainder of your loop. only if you want to be really pendantic that is, for your application it should be fine just a FYI
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