I'm actually working on a project which is a IRON-MAN Mask with a LED Strips inside his eyes and move detection in his mouth.
The problem is that I really don't like the cable in the middle so I'm trying to get rid of it.
Here is the actual circuit :
Since it's in the hallway, It's lightning himself twice a day during 5 seconds each time. I was thinking of putting it on a 3.7 volt battery (18650 with 3000 mAh) and buying a 3.7 -> 12V converter but I'm not sure it's very efficient.. I don't want to recharge it too often (Maximum 1 time every month).
I'm currently using :
- Arduino nano v3
- Down converter 12V to 5V
- RGB strip (6 leds)
- 12V supply
- 3 x NPN transistor IRLB8721
- PIR sensor
But for the next version of it I have :
- Arduino pro mini 3V3 8mhz
- 3.7V to 5V converter : Do I really need it ?
- 2 (or 1) x 18650 Samsung INR18650-30Q 3000mAh battery
- Charging and battery safe discharge chip 03962A
I did some search so I can save power like : putting into sleep the arduino and waking it up when the PIR sensor is getting a signal, cutting the power led on the board.
So my questions are : Do I buy the 12V converter to power the led or is it useless cause It will drain too much power ? And is it possible to power the 3.3V arduino with a 3.7V battery through the VCC pin (so it's not using the converter on the arduino ex: raw pin) ?
I hope I explain it clearly since I'm French and this is my first post.