Hi, I received a samd21 dev breakout board from digikey and when I ran the blink program to test the RX led does not light and the pin does not sink the 3.3 v so it must be mapped wrong. ALSO the serial does not work. I saw in the comment were someone else had this problem and your moderators told them to go to this forum. I can’t find anything even though this seems to be a common problem. The programs load but will not talk to arduino’s serial or even putty. please help.
Hmmm.
If you’re able to load a program, serial is working. Are you trying to communicate with Serial.print or SerialUSB.print?
For the LED issue, see:
I combined the serial with the led program you suggested:
const int BLUE_LED = 13; // Blue “stat” LED on pin 13
const int RX_LED = PIN_LED_RXL; // RX LED on pin 25, we use the predefined PIN_LED_RXL to make sure
const int TX_LED = PIN_LED_TXL; // TX LED on pin 26, we use the predefined PIN_LED_TXL to make sure
bool ledState = LOW;
//farts
void setup()
{
Serial.begin(9600);
delay (1000);
Serial.println(“farts”);
pinMode(BLUE_LED, OUTPUT);
pinMode(RX_LED, OUTPUT);
pinMode(TX_LED, OUTPUT);
digitalWrite(RX_LED, HIGH);
digitalWrite(TX_LED, HIGH);
digitalWrite(BLUE_LED, LOW);
}
void loop()
{
Serial.println(“farts”);
digitalWrite(RX_LED, LOW); // RX LED on
delay(2000);
digitalWrite(RX_LED, HIGH); // RX LED off
digitalWrite(TX_LED, LOW); // TX LED on
delay(2000);
digitalWrite(TX_LED, HIGH); // TX LED off
digitalWrite(BLUE_LED, HIGH); // Blue LED on
delay(2000);
digitalWrite(BLUE_LED, LOW); // Blue LED off
}
It compiles and uploads successfully. But the serial monitor does not display anything and only 2 leds flash. I tested the RX pin with ta multimeter and the line is connected (continuity) and has the pull up enabled (3.3v) but does not change state. In the comment of the product there is another person complaining about this exact same problem.