opened 09:38AM - 24 Jun 19 UTC
closed 03:30PM - 28 Jun 19 UTC
Arduino Uno WiFi Rev2
Arduino megaAVR Boards 1.8.1
Arduino IDE 1.8.10 Hourly B…uild 2019/05/21 09:33 / Arduino IDE 1.9.0-beta build 107
Windows 10 64 bit / Ubuntu 19.04
The following code:
```c++
void setup() {
delay(1000); // to prove the issue is not related to printing immediately after startup
Serial.begin(9600);
delayMicroseconds(100);
Serial.println("hello"); // called after a delay, so it prints fine
Serial.println("hello"); // just to be sure everything is still printing OK
Serial.begin(9600);
Serial.println("hello"); // called without a delay, so it's garbled
}
void loop() {}
```
results in this output:
```
hello
hello
⸮⸮⸮⸮5
```
Without a delay of around 100 us between the call to `Serial.begin()` and `Serial.println()`, the output is garbled. As you can see from the output, this is not related to being soon after the program starts. It occurs even with subsequent calls to `Serial.begin()` (it also would have after the first call without the delay).
I've never experienced this with any other official Arduino board.
I've seen at least two threads on the Arduino Forum so far where this caused confusion.