Hi, im very new to the Spark Core (im very familiar with Arduino and similar boards). I want to be able to connect my Spark Core to an Arduino board via Serial so that I can send commands between them but there is the issue of the voltage difference (3.3V vs 5V). Is it possible (and safe for the s…

Here is a forum post discussing it… [image] Spark and Arduino Serial Communications Spark is 3v3. (Many) Arduinos are 5v. To get them communicating via Serial, I’m assuming I need a logic level converter, correct? I’d like to communicate back and forth between a Spark Core (Serial1) …

Have you seen this and this thread? There are also other threads, when you search for 3.3 or 5V, you’ll find plenty. @Hootie81 obviously beat me to it :wink:

hi! yes, i did find those threats but i couldn’t find any confirmation when using serial2 on pins D0 and D1. I asume it should be ok since those pins are 5V tolerant. I just wanted to make sure before something smoked… I’ll read them again though, in case i might have missed something! Thanks!

OK, as I reread the threads mentioned, I’m pretty certain that you don’t need to go via D0/D1 when you use a voltage divider (200 + 330 Ohm) or a LED (min 1.5V forward drop) in the Arduino TX -> Core RX line and make sure that the Arduino RX never gets driven high. On D0/D1 you are save without the…

Good to know, yeah, i guess it’s always best to design for the spec voltage. Thank you!! :wink:

Serial communication with Arduino (3.3 vs 5v ttl)

Getting Started

Hootie81 August 31, 2014, 3:09pm 2

Here is a forum post discussing it…

Topic		Replies	Views
Spark and Arduino Serial Communications Hardware	6	6212	March 19, 2014
Spark (3.3v) to Arduino (5v) Serial Communication Project Share	30	30149	December 21, 2014
Can Tx and Rx pin tolerate 5V from another device? Hardware	6	4052	September 12, 2014
Send IR signals to Spark core from Arduino Troubleshooting	3	1844	December 13, 2015
Arduino serial communication to Spark Core Troubleshooting	25	12700	July 18, 2016

Serial communication with Arduino (3.3 vs 5v ttl)

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