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+--- Thread: Get PWM out, even by sacrificing other functionality (/showthread.php?tid=6672)
Get PWM out, even by sacrificing other functionality - tarajas - 09-12-2024
Hi,
I have a 1.2.4 version A4 board and I was wondering if there are some quick and dirty adjustments to be made potentially even with some small amount of soldering to get a PWM output on the board maybe?
Like I could sacrifice the 433MHz related functionality for examle?
Is there maybe such a modification?
Thanks for the help in advance
RE: Get PWM out, even by sacrificing other functionality - admin - 09-13-2024
if you don't use 433M or IR pins, you can use two pins conenct with a PCA9685 PWM i2c bus output module. just use for SDA and SCL pins.
RE: Get PWM out, even by sacrificing other functionality - tarajas - 09-13-2024
Thank you very much for the answer!
I guess the PWM level from this setup will match the logic level of the ESP32 3.3V right?
So if I want 5V PWM then I need tk get an LLC after the generated PWM signal as well am I right? And feed that with 5V...
RE: Get PWM out, even by sacrificing other functionality - admin - 09-13-2024
just add a convert circuit, switch to 5v level. ESP32 is 3.3v level.
RE: Get PWM out, even by sacrificing other functionality - tarajas - 09-13-2024
Thanks, okay.
RE: Get PWM out, even by sacrificing other functionality - tarajas - 09-13-2024
Hi,
Luckily I have checked and maybe I can get by with analogue DC control 0-5V.
The BLDC fans I use seems to accept analogue DC instead of PWM.
One question in relation to this:
The KCS firmware does not really offer dynamic control of fan rpm based on temperature right?
Like a PID thermostat for example... for that one needs to write code or use esphome right?
RE: Get PWM out, even by sacrificing other functionality - admin - 09-13-2024
KCS not support that, you can use ESPHome.
RE: Get PWM out, even by sacrificing other functionality - tarajas - 09-14-2024
Thanks, okay.