I just rigged up a test circuit to begin the process of making my Itsy talk to another Arduino as a slave processor. The code (below) is simple at this stage... just send a message.. receive it... and print on the console. It's working just fine. Although I have issues with the IDE. But my question is related to the picture I uploaded. Why is the Itsy powered at all when the only connections to it are a GND line and the Tx/Rx wires to 0 & 1. As you can see in the pix, the red led is on and blinking as the sketch tells it to. And no USB or batt or 5v power is being supplied. So where's the power coming from? I can't believe it's pulling juice from the Rx line sufficient to power itself. And if it is I don't want it to. Comm lines should not be supplying power.
Let me know when you get a minute. Thanks.
- Itsy pix.jpg (614.61 KiB) Viewed 252 times
====Itsy Code=========
#include <Arduino.h>
#include <stdlib.h>
#include <math.h> // AVG math library for calculations
void setup() {
Serial1.begin(19200);
pinMode(13, OUTPUT);
}
void loop() {
Serial1.println("Hello, this is Itsy");
digitalWrite(13, HIGH); // turn the LED on
delay(250); // wait for a bit
digitalWrite(13, LOW); // turn the LED off
delay(1750);
}
======Arduino Code===============
#include <Arduino.h>
#include <SoftwareSerial.h>
SoftwareSerial ItsyLink(9, 8) ;
void setup() {
Serial.begin(115200);
ItsyLink.begin(19200);
Serial.println("Ard Side Starting");
delay(2000);
}
void loop() {
if(ItsyLink.available()){
char c = ItsyLink.read();
Serial.print(c);
}
}
