Electrical Engineering

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Nick Alexeev

00:22

@MLM What are the devices in question? Why different references? Where do the reference voltages come from? Who's going to trace out wires in a Fritzing-drawn breadboard? (Not me.)

@PatoSáinz fyi: There is a dedicated stack for HAMs.

MLM

00:41

@NickAlexeev Teensy 3.0 (3.3v USB device) and Step-down buck converter to power the servo. Buck converter attached to a 24v power supply (3 prong)

I made this question before and it seems like a similar situation but just being cautious

The Teensy is powered via USB from a computer

I want to make sure the ground reference from the Teensy and the output of the Buck converter is the same.

Anonymous

@NickAlexeev yep but i'd rather use the chat... which is kinda dead there

Nick Alexeev

01:16

@MLM Servo and your microcontroller have to use the same ground.

MLM

01:32

@NickAlexeev I am using a separate power supply(with step down converter) to try to avoid hitting the 100mA cap on the 3.3v pin on the microcontroller

Nick Alexeev

@MLM Separate supply for the servo?

MLM

@NickAlexeev correct

Nick Alexeev

@MLM The supplies' grounds have to be connected.

MLM

Alright, that was my plan. Connect the microcontroller and step down output grounds together. Then, servo data pin to microcontroller and servo power/gnd to step down converter

@NickAlexeev Thanks for the reassurance/info. Lines up with what I thought and the info I gleaned from the question I made previously

Nick Alexeev

01:59

@MLM You're welcome.

MLM

02:45

Follow-up: circuit worked great!

6 hours later…