HI,
I'm working with a peltier module and a temperature sensor LM35 to create a circuit for cooling or heating reactions.
I'm wondering if I need 5V to power my arduino micro or if a coin cell battery of 3V could be enough.
The peltier module is powered from a 9V battery, so the coin cell would be just for the arduino.
I'm looking for suggestions!
thanks, gi
Don't Peltier modules draw a LOT of current? I hope you have a very hefty 9V battery.
An Arduino will run on 3V but at 16 MHz you should not feed it less than 3.7V. You can run at 8 MHz down to 2.4V:
Peltier junction devices are very sensitive to voltage and won't operate very efficiently outside a relatively narrow range. Have you confirmed that yours will operate on 9V?
What kind of power source is this? Peltier junction devices draw on the order of 5 to 15A.
A coin cell won't work. (for more than an hour)
I've not met a 9V battery capable of the 5 to 10A that most peltiers require,
something like a large 12V SLA or 11.1V LiPo pack sounds more possible.
Or perhaps you have a much smaller peltier than we are imagining?
As always you should provide full information on the identity and datasheets
of devices if you want informed answers rather than hand-waving...