Best way to drive a 5VDC relay coil from raspberry pi zero w?

Components & Accessories Power
1

I’ve got a well pump (240VAC, probably draws around 8 amps) that I bought a relay for (Panasonic SP2-DC5V) and a raspberry pi zero w to trigger the relay.

The amperage/voltage required for the relay coil (60 mA/5V) don’t match the pi, so I grabbed a Sparkfun logic level converter (https://www.sparkfun.com/products/12009) as well. I’m now realizing that this converter itself won’t actually work, because it can’t supply 60mA to the coil (due to the 10kOhm pullups). Should I be looking for a transistor/resistor pairing to drive the coil based on the pi’s gpio?

2

You can use a transistor driver, switching a 5V power supply for the relay coil. Don’t forget the inductive kick diode across the relay coil. Typical circuit for a logic level (required) MOSFET shown below. A motor driver module will work too.

MOSFET_low_side_driver.png666×528 3.44 KB
https://www.gammon.com.au/images/MOSFET … driver.png

3

So, something like this?

HN21KgT.png800×400 282 KB
https://i.imgur.com/HN21KgT.png

(edit: d1 is drawn backwards)

How do I size R1? I don’t know much about FETs, I assumed that it wouldn’t draw an unsafe amount of current.

Similarly, how do I select a diode for D1?

Thanks for the help

4

Would a solid state relay be viable for this?

https://www.sparkfun.com/products/13015