I would like to know if it is A good idea, to use A reed switch to run an Arduino, using 9v battery.
So the reed switch will control the Arduino's Power, turn the Arduino on or off.
Here is the stats on the reed switch am going to use.
Maximum power: 10W.
Maximum switching voltage: 300VDC.
Min. Breakdown Voltage: 150 VDC.
Maximum switching current: 0.55A.
Max. Operate time: 0.45 ms.
Bounce time: 0.25 ms.
Max. Release time: 0.35 ms.
Resonant Frequency: 5000 HZ.
Max. Operating Frequency: 400 HZ.
Pull in Value: 20-70 AT.
Min. Drop out Value: 4 AT.
Max. Contact Capacitance: 0.5 pF.
A normal relay is better.
A reed relay or read switch can often switch only a few mA.
Your reed switch seems to be a big one, it can switch 0.55A. When the Arduino is switched on, charging the capacitors could result into a peak that is larger. Is something connected to the Arduino ? for example a servo motor or an Ethernet shield or leds (those use extra current).
Given that it can switch 550 mA, that reed switch will probably work quite OK - the only concern being the impulse current charging the input capacitors, and that problem being much less of a concern if you are using a Pro Mini as you would with a device operating from a battery.
Did you mean reed switch, or reed relay? I would suspect the reed switch would correspond to a project in a box, switched on by opening the lid or similar action.
You do not use a "PP3" battery to power an Arduino - I presume you refer to six "AA" cells at minimum.
The Arduino I am using runs at
3.3V and I did check the current.
The current is running at 25mA.
So I could be ok.
That is right I am using A reed switch.
Thank You Both For You're Input!