strange pulsation on GPIO pin in HIGH state
Posted: Sat Jun 23, 2018 10:03 amESP8266, ESP-12F module, Arduino core
For purity of experiment I've cleaned the code and left it with just the single pin inicialized as OUTPUT, and pull it HIGH with digitalWrite
this is what I see
do you see that ripple? it about 0.1Hz or so.
The bright LED, being connected, distinctly blinking (for normal LED it is not really obvious). All GPIOs behaving similarly. Could anybody give any hint, why this coud happen?
For purity of experiment I've cleaned the code and left it with just the single pin inicialized as OUTPUT, and pull it HIGH with digitalWrite
Code: Select all
while( 1 ){
digitalWrite(LED, 1);
delay (2000);
digitalWrite(LED, 1);
delay (2000);
}
this is what I see
do you see that ripple? it about 0.1Hz or so.
The bright LED, being connected, distinctly blinking (for normal LED it is not really obvious). All GPIOs behaving similarly. Could anybody give any hint, why this coud happen?
sorry