@P-R-O-C-H-Y Can you help answering this?

Hi @stef-ladefense,

1. Minimum frequency is 1Hz. You need to be careful what frequency and duty resolution you select. See ESP-IDF LEDC docs for more info -> link. There is a simple rule for setting LEDC frequency:
   lower frequencies -> higher resolution
   higher frequencies -> lower resolution (example 40MHz freq can be set only with bit resolution 1)
   I was able to set 1Hz frequency using 12 bits resolution ledcSetup(0,1,12);

2. LEDC should work on all available pins, if they are not used for anything else or "reserved" for something. I can test GPIO 10 / 14 to check it.

hi @P-R-O-C-H-Y
I tested the frequencies on an S2, just to realize the limits.
besides, it is useless to go too low otherwise it flashes.
for the pins, I have not tested further, but the limits that I have found are on an assembly with a screen driven in SPI.

// Test on Lolin S2 Mini ESP32-S2FN4R2 on gpio15 (internal led) https://www.wemos.cc/en/latest/s2/s2_mini.html
// bits freq min freq max (Hz)
// 1 19532 ?
// 2 9766 10019569
// 3 4883 5009784
// 4 2442 2504892
// 5 1221 1252446
// 6 611 626223
// 7 306 313111
// 8 153 156555
// 9 77 78277
// 10 39 39138
// 11 20 19569
// 12 10 9784
// 13 5 4892
// 14 3 2446
#define bit_num 3
#define freq 5000
#define channel 0
#define pin 15
const uint16_t maxi = (1 << bit_num) - 1;
uint16_t dutyCycle = 0;
int8_t _direction = 1;
void setup() {
 ledcSetup(channel, freq, bit_num);
 ledcAttachPin(pin, channel);
}
void loop() {
 if (dutyCycle == maxi) _direction = -1;
 else if (dutyCycle == 0) _direction = 1;
 
 dutyCycle += _direction;
 ledcWrite(channel, dutyCycle);
 delay(5);
}