Serial communication via usb works like a charm, however, using TX and RX pins (and Serial1 commands + Serial1.begin(9600) ) produces no results Simple “hello world” programs don’t seem to work at all, even hooked up to an oscilloscope no change on the pins can be seen any other troubleshooting su…

ok that’s what I figured haha int i=0; void setup() { Serial.begin(9600); Serial1.begin(9600); } void loop() { Serial.println("working"); Serial1.write(i); i++; delay(1000); }

Hmm, my scope and DMM is not with me now. Will test and get back to you. Or someone else in the community can help see if the tx rx is communicate ok :smiley:

That’s alright, I won’t have access to the spark until tomorrow morning, so I won’t be able to confirm anything just yet.

I have tended to receive on the Spark physical serial port, but I have had few issues. Obviously when I forgot to use a Serial1.begin(9600) things would not work, but once that is fixed, things work. The other issue I have had is code like if Serial.available() {Serial1.read()} Don’t forget that th…

yep, didn’t forget the Serial1.begin(9600) I’m using a LT10801CN RS-232 transceiver to bring things to the spark’s level However it seem the issues i’m having reside in the spark

@daflippymaster , just a note that Serial1.write() takes a uint8_t argument (char) and I am not sure what passing an int will do. :smile:

here is a very simple little program that acts as a serial pass-thru for testing, i used it to talk to a adafruit fingerprint reader, so its tested and works fine with the PC app. void setup() { Serial.begin(57600); Serial1.begin(57600); } void loop() // runs over and over { while (Serial1…

@peekay123 , Thank you, i’ll have to remember that for future use, however it doesn’t seem to make much of a difference whether .print() or .write() is used (in terms of the TX pin functioning) @Hootie81 , Just gave your code a shot and, unfortunately, there’s still no change -____- Could it be bad …

@daflippymaster , have you tested with the LT10801CN completely disconnected from the core? Is the core on a breadboard?

Yep, i’ve taken the core off the breadboard so that it’s only attached via usb so we’ve ruled out the board as the issue

TX and RX pins refuse to work

Troubleshooting

Hootie81 July 18, 2014, 3:06pm 20

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TX and RX pins refuse to work

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