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I'm building a project that involves a raspberry and a small 3-6v water pump. As the RPI and the water pump run on 5V I am using a single 110v-5v 2.5 Amp walwart to supply the power.

My question is, will I cause the raspberry pi harm as a variable current passes through the load? Initially the raspberry pi was not a happy but upon adding a flyback diode it seems to be OK. Are there other precautions I should take to ensure the RPI is not harmed?

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  • \$\begingroup\$ I would change the diode from a zener to a standard diode with a forward .7V drop as opposed to the higher drop of the zener. Also a .1uF or a little higher, also across the motor, (motors are noisy) will clean up your power line. Both components should be as close to the motor as possible as good practice dictates. \$\endgroup\$
    – Sara Heart
    Commented May 21, 2018 at 22:10
  • \$\begingroup\$ (Sorry about the duplicate) \$\endgroup\$
    – Sara Heart
    Commented May 21, 2018 at 22:47

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I would change the diode from a zener to a standard diode with a forward .7V drop as opposed to the higher drop of the zener. Also a .1uF or a little higher, also across the motor, (motors are noisy) will clean up your power line. Both components should be as close to the motor as possible as good practice dictates.

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