CrossX
Newbie level 2
- Joined
- Oct 30, 2019
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- Location
- Saint Petersburg
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Hello friends,
i'm newbie in microelectronics, but it's very interesting for me :grin:
Best practice to learn something - work with real projects.
I want build Web Based PWM Controller (NodeMCU + ULN2803) for my home server room.
Requirements:
- web based PWM control
- temperature monitoring
- "silent mode" for night time
- adaptive fans work based on current temperature
Components:
- 4 x 12V 0.21A PC FAN
- 3 x DS1820 temperature sensor
- ESP8266 ESP-12E NodeMCU
- ULN2803APG 8ch Darlington Sink Driver
Now i have working prototype on breadboard, but i'm not sure in RC Filter. It's really needed? And same question about overvoltage protection.
In some resources people say that "Motor inductance is enough to smooth your PWM." And on this forum LINK offer clean overvoltage protection with 100nF ceramic capacitor, 10uF electrolytic capacitor and 20V zener.
Thanks!
i'm newbie in microelectronics, but it's very interesting for me :grin:
Best practice to learn something - work with real projects.
I want build Web Based PWM Controller (NodeMCU + ULN2803) for my home server room.
Requirements:
- web based PWM control
- temperature monitoring
- "silent mode" for night time
- adaptive fans work based on current temperature
Components:
- 4 x 12V 0.21A PC FAN
- 3 x DS1820 temperature sensor
- ESP8266 ESP-12E NodeMCU
- ULN2803APG 8ch Darlington Sink Driver
Now i have working prototype on breadboard, but i'm not sure in RC Filter. It's really needed? And same question about overvoltage protection.
In some resources people say that "Motor inductance is enough to smooth your PWM." And on this forum LINK offer clean overvoltage protection with 100nF ceramic capacitor, 10uF electrolytic capacitor and 20V zener.
Thanks!