Why does LED blink below 5hz at max PWM value?

Other Hardware LEDs and Multiplexing
1

New to electronics, tinkering with pulse width modulation on my led. When I set the frequency at 5hz and give it the max value in analogWrite, it gives me 100% duty cycle as expected. However any frequency below that it will blink and give me a 15.8% duty cycle. What is the reason for this? Why is the led not capable of powering on all the time below this frequency ?

3 
void setup(){
pinMode(4,OUTPUT);
analogWriteFreq(4);
}

void loop(){
analogWrite(4,255);
}

Code is very barebones as you can see, I'm using an esp8266 board however.

4

PWM is "blinking".

Normally it's faster than the eye can see and the LED appears to dim.

6

"4" is not a valid frequency. Take that line out completely and use the default value of 1 kHz.

7

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