Hi There,
i have no experienced using adruino. this is my first try. i will use Arduino UNO R3. i would like to build 12vdc 50 watt heating circuit with tempreature control using LM35 . 12 volt rechageable battery will be connected to the heating element. My questions are:
Arduino UNO R3 has an onboard regulator so you should be able to connect 12V battery direct to the "7 to 12V DC" input jack - just make sure that the positive pin on the board connects to the positive terminal on the battery and vice versa.
You will need some kind of external switching device to control the heating element as Arduino outputs cannot supply that amount of power. You can use a power transistor, a MOSFET or a relay. There are lots of projects like this online so search "Arduino heater LM35" for different solutions.
Tq for your suggestion
Ds18b20?
Dmitron1036:
Ds18b20?
Yes, save yourself some trouble, and replace the LM35 for a DS18B20 digital temp sensor.
Best to use a logic level mosfet to switch the heating element on/off.
A relay(module) would put an extra load (heat) on Arduino's 5volt regulator.
First diagram on this page could work.
Replace the "motor" in the diagram for your heating element, and you could omit the diode.
Leo..
Wawa:
Best to use a logic level mosfet to switch the heating element on/off.
A relay(module) would put an extra load (heat) on Arduino's 5volt regulator.
Also, you cannot PWM a relay, so you would be tied to a relatively slow bang bang control loop, and the relay may still wear out, especially if it is a cheap standard relay.