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I have received so much support from this community by reading already answered questions. But now I got one that hasn't been asked yet. I have nearly a dozen sensors connected to my pi 3 so it's only natural I should be concerned about supplying adequate power to the pi.

My question is: how many amps should I be feeding the pi considering that I got six 5v and five 3v sensors connected?

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    Depends on the sensors. A gas sensor or similar can draw a couple of hundred milliamps while a temperature or humidity sensor might have a negligible current draw... – BobT Sep 29 '17 at 22:24
  • 1 5v fan, 1 PIR, 1mq5, 1dth11, 2 active laser diode, 1 relay switch, 1 tilt switch, 1 buzzer, 1 16x2 char LCD, 3 Leds. – Allen Jakpa Sep 29 '17 at 22:32
  • The Pi draws current as needed. You don't actively "feed" it. Not clear if that's a simple misuse of terms or if it represents a genuine misunderstanding on your side. – Brick Sep 30 '17 at 0:12
  • OK.. Actually what I mean by 'feed' is how many amps should the power adapter powering the pi be considering the plethora of sensors. 2amps? 3amps? – Allen Jakpa Oct 1 '17 at 0:59
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I'd assume the the following:

  • 5v fan - 100 mA
  • PIR - 5 mA
  • MQ5 - 5 mA
  • DHT11 - 5 mA
  • Active laser diode - 16 mA x 2 - 32 mA
  • relay switch - 1 mA
  • tilt switch - 1 mA
  • buzzer - 50 mA
  • 16x2 char LCD - 10 mA
  • LEDs - 8 mA x 3 - 24 mA
  • Will a 5v 2 Amps charger be enough? – Allen Jakpa Oct 1 '17 at 1:00
  • I would be surprised if it wasn't. The Pi should need about an amp for itself. There should be plenty left over for your peripherals and sensors. – joan Oct 1 '17 at 9:26
  • Great. I'm doing it right then. However, I noticed that the LCD would sometimes pulsate with the buzzer when it went off. – Allen Jakpa Oct 1 '17 at 9:36
  • I am guessing about how much the various components use, it wouldn't be a surprise if the buzzer uses more than I had thought. – joan Oct 1 '17 at 11:08

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