Re: ESP32 PWM Max frequency output
Posted: Wed Apr 21, 2021 7:57 am
by Minatel
Can you check the output signal using a scope?
Re: ESP32 PWM Max frequency output
Posted: Wed Apr 21, 2021 1:03 pm
by JKL@122JKL
I do not have the scope at the moment due to WFH.
I've checked voltage using a meter (average) value of 1.75V.
At this, I can hear a slow humming sound(turns on) from the Transducer but doesn't produce the vaporize effect.
I've changed the duty cycle value from the above code to 10, and even at higher voltage, still the same doesn't produce any.
ledcWrite(LEDC_CHANNEL_0, 10);
Re: ESP32 PWM Max frequency output
Posted: Sat Apr 24, 2021 4:15 am
by JKL@122JKL
Can I try with varying frequency to check whether at particular freq inside a for loop or so?
Re: ESP32 PWM Max frequency output
Posted: Mon Apr 26, 2021 6:35 am
by JKL@122JKL
Hi @ ESP_Minatel
From this board linked below, I removed an unknown uC PWM resistor to MOSFET and connected ESP32 PWM Output-113KHz 50% Duty cycle, even with that transducer turns on and no mist effect.
(
https://robu.in/product/dc-5v-ultrasoni ... zing-chip/)