Hello everyone!
I want to use CR2032 battery (3v) as main power supply for standalone Arduino Mini + 433mhz transmitter.
3v are enough for stable work?
Which pin i should connect with power supply (9v pin or 5v) and what the difference?
How long this battery can keep the power?
The Mini requires an input voltage of 7-9 volts so a single 3V battery will not power it. I have no idea what 433mhz transmitter you are talking about, so I can't comment as to what it's power requirements are.
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TX Technical Specifications:
I tried to connect the 3v arduino mini, it works without a transmitter (tested on basic blink sketch). But when I plug the transmitter then the signal from it is almost zero. This low voltage is safe for arduino?
The problem you are going to run into is current capability of the battery. That transmitter probably draws far more current than the battery is capable of providing.
How much current does your Arduino + Transmitter draw? (You need to measure this.)
Are you using the 3v3 version of the Mini or the 5v?