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Hi to all,
sorry for the very noobish question.
I'm tryng to learn from some month the best method to switch a 5v board (but working also with 3v3) via an Arduino mini 3v3.
Background: Arduino is powered via 2XAA battery (led and voltage regulator removed) and sleep "indefinitely".
When PIR is engaged (connected to an Interrupt), Arduino wake up from his sleep and need to poweron a MAX7219 driving 2x4 digits 7 segments display, showing current time.
Of course Arduino cannot power current needed from the 2x4 7 digits, so I need to power them (and their Max7219) directly from the batteries.
Because is a powered battery project, of course I would mantain MAX7219 totally OFF and power on only when required.
From a couple of month, I'm tryng to learn high side switch, low side switch etc etc, with their pro and cons.
Finally, I need to say on your forum an help to you. I did but in this time several transistors/mosfet, PNP and NPN.
Can you help me please, with a simple addressing / schema and what transistor(s) is better to use? At the moment I have available:
My goal (though) is get the 3v from the 2xAA battery, split in 2: 1 path to the mini (sleeping) and 1 path "switched off" via the transistor. When Arduino wake on, he need to power on the MAX7219, closing the second path and giving current and voltage to the MAX.
Thank you, another time.
sorry for the very noobish question.
I'm tryng to learn from some month the best method to switch a 5v board (but working also with 3v3) via an Arduino mini 3v3.
Background: Arduino is powered via 2XAA battery (led and voltage regulator removed) and sleep "indefinitely".
When PIR is engaged (connected to an Interrupt), Arduino wake up from his sleep and need to poweron a MAX7219 driving 2x4 digits 7 segments display, showing current time.
Of course Arduino cannot power current needed from the 2x4 7 digits, so I need to power them (and their Max7219) directly from the batteries.
Because is a powered battery project, of course I would mantain MAX7219 totally OFF and power on only when required.
From a couple of month, I'm tryng to learn high side switch, low side switch etc etc, with their pro and cons.
Finally, I need to say on your forum an help to you. I did but in this time several transistors/mosfet, PNP and NPN.
Can you help me please, with a simple addressing / schema and what transistor(s) is better to use? At the moment I have available:
- 2N3906
- P2N2222A
- TIP120
- 2N3904
- FQP30N06L
- 2N7000
- NDP6020P
- BD239C
- ULN2003A
- PN4391
My goal (though) is get the 3v from the 2xAA battery, split in 2: 1 path to the mini (sleeping) and 1 path "switched off" via the transistor. When Arduino wake on, he need to power on the MAX7219, closing the second path and giving current and voltage to the MAX.
Thank you, another time.
