Esphome pwm fan control

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This fan can be controlled either by varying the DC voltage or by using the low frequency PWM drive signal. I have tried EVERYTHING to get manual control of the fans and haven't been able to reliably control them. 4 - 44 CFM ± 10% Fan Air Pressure 0. The more PWM outputs used, and the higher their frequency, the closer you get to the CPU limits, and the fewer CPU cycles are available for sketch execution. ce420 rgb lighting and fan control. It also supports motor control features through internal registers of the The SK D-RGB PWM fans provide a high airflow cooling solution with the nine-bladed design. For this purpose we will use ESP8266. In this tutorial, we are using potentiometer and STM32 to vary the brightness of LED and speed of a DC fan by PWM technique. Argus Monitor runs in the background and control fan speeds as well as monitor hard disk health. 4-Pins fans can be speed regulated by PWM. 5 - 14 dBA Fan Bearing Type Loop Dynamic Bearing (LDB) Fan Power Connector 4-Pin (PWM) Fan Rated Voltage 12VDC Fan Silent Wings 3 120mm PWM stands for state-of-the-art technology, virtually inaudible operation and superior cooling. It also supports motor control features through internal registers of the SIGNAL. It has GPIO, SPI, I2C, ADC, PWM AND UART pins for communication and controlling other peripherals attached to it. PWM fans are DC fans with an extra wire for PWM. From the ESP connect the 3. Pulse Width Modulation (PWM) is a technique that varies the width of a pulse while keeping the wave frequency constant. Item #: 9SIA4UBBBB1518. It is a reliable and light program to change or control fan speed. During high system loads the Z3 Pro spins at 1,500 RPM while delivering 45. There are two temperature inputs and three outputs (PWM, 0-10 VDC and 10-0 VDC) to control the ECM or VFD variable speed fan motor. Base PWM frequency is 25kHz but it’s acceptable from 21kHz to 28kHz. Select a frequency for pulse width modulation. 4-wire fans have a separate PWM input wire and an RPM sensor. When PWM calls for full speed, you should see ~11. Voltage control typically provides lower efficiency than the PWM control, minimum speeds are also not as low as with PWM control. Select the PWM channel. Default is empty. So I could still "listen" to what's going on the bus and is being reported to the existing master (e. . The frequency values can be adjusted between 125 HZ -- 8 MHZ as well as a variable duty cycle. Cooling fans are a vital part of computer hardware, as they cool the CPU and ventilate casing, enabling active cooling in computers. 4 TACH2/AIN2 Digital/Analog Input. As an alternative to hardware PWM it is possible to do PWM purely in software, typically So, PWM speed control of a standard fan is indeed very different from PWM speed control of a PWM fan… Nidec even goes so far as to say that modulating the main supply voltage is not advisable: Pulse-width modulation of DC operating voltage to modify fan speed is not recommended. Check your motherboard manual for more details. One senses the temperature by using humidity and temperature sensor namely DHT11. Note the use of the resistor. It includes firmware which runs on the low cost Wi-Fi enabled ESP8266 Wi-Fi SoC from Espressif Systems, and hardware which is based on the ESP-12 module. The CORSAIR iCUE SP120 RGB ELITE Performance Fan boasts eight bright, individually addressable RGB LEDs, adding to the vivid RGB lighting in your SP RGB ELITE-cooled system. Fan controller is connected to internet and EasyIoT Cloud over WiFi. ST's portfolio of pulse-width modulator (PWM) controllers can support isolated and non-isolated AC-DC and DC-DC switch mode power supplies based on the most popular topologies in both single-ended (such as fly-back, forward or quasi-resonant) and double-ended configurations (such as asymmetrical half-bridge) for mid- to high-power SMPS. Setting the PWM properties to control the speed. If an instance was found, it will be shown as “Discovered”, which you can select to set it up right away. The FDCA consists of a proportional solenoid cartridge valve mounted in an aluminum manifold to which an FDC electronics module is attached. MQTT client to control a PWM fan from a raspberry pi. Shrouded Powerpacks. Connecting 3 or 4 wire fans. ESPHome not recommended for critical apps. 🎵 🌈 Real-time LED strip music visualization running on ESP32 based on Arduino or ESPHome platform PWM fan control. 8 million colors LED ring and TT RGB PLUS software. Manual configuration steps. However, the use of low-frequency PWM switches the fan on-and-off and can produce noise. 4. SmartFusion cSoC: DC Fan Control Using PWM 4 3-Wire Fan The 3-wire fan has three pins: power, ground, and tachometer. Single Powerpacks; Dual Powerpacks STEP 1 Identify your fan type by the fan connector. Products. ESP8266 NodeMCU is an open source IoT platform. With one PWM output at 40KHz, the CPU is already rather loaded. You can use the same microcontroller to dynamically monitor the output and adjust the LM317T. The fifth fan control software we want to mention is the Argus Monitor. You need a mosfet chip between the ESP and Fan to control it. If the temperature measured exceeds the threshold THIGH, the PWM_OUT duty cycle is incremented by one step, i. The ESP doesn’t have hardware PWM, so the implementation is by software. 3 PWM_OUT2 Digital Output, Open-Drain. This chip is a custom one made by ITE for Gigabyte and no datasheet was available. This form of speed control is open-loop. See full list on github. PWM CONTROL FUNCTIONS FOR OPTIMIZED FAN SPEED. Using an RC lowpass filter and an op amp, you can convert the PWM signal to a dc level that can adjust the LM317’s voltage output. Integrated with D-RGB lighting in the hub, the fans light up with smooth and vibrant colors. Customise each Switch with a different commands. 25" Drive Bay. The value is used to calculate the percentages for each speed. If there wasn’t any discovered automatically PWM or Pulse Width Modulation has generally been regarded as too complicated for PC fan speed control compared against using rheostats or linear voltage regulators such as the LM317. The laptop bottom is running too warm for my taste at low workloads which is inconvenient when Hit enter to search or ESC to close. Recently I found a module that can handle upto 2 Ampheres of power either in 110v/220v AC with a zero cross dectector. 99. This Pulse-Width-Modulation (PWM) DC motor controller can provide up to a maximum continuous current of 50A to your DC motor or other DC load thanks to a digital microcontroller based (PIC) design and highly efficient High-Power MOSFET for cooler operation. This unique controller varies fan speed based on your custom temperature setting giving cooling when needed, not when you don’t. Tuya door sensor tasmota ; Since version 1. 3 Volts) and off (0 Volts) by changing the portion of the time the signal spends on versus the time If they are PWM, take a small flat-headed screwdriver and pull the PWM pin out of the fan connector by pushing the metal part on top and pulling it back. Also, since thinkfan now can work with lm-sensors sensors, it is no longer specific for IBM / Lenovo ThinkPad computers. Pulse width modulated output to control FAN2 fan speed. The tacho signal from the fan sinks to ground for every revolution, the input on the motherboard is pulled high. Intel specification (July 2004, Rev 1. Note: I have replaced this Raspberry based solution with an Wemos/ESPHome based one you can find here: Connecting the fan to the Arduino. PWM values are set 64 steps using hex values from 00-FF (ox00 to 0x64). Temperature control with PID on Arduino and PWM fans for DIY server/network rack cooling A few weeks ago I needed to setup a rack with network devices and a few servers. 2) defines the intended operation of a fan that implements the Pulse Width Modulation (PWM) control signal on the 4-wire fan interface. 3) program the ESP8266. 0x00 is minimum speed, 0x64 is full speed, and 0x32 is 50%, etc. If you don’t have an IT-ISA entry, your PC may not support fan control, but you can click each chip and look for switches with “PWM 1 mode”, PW 2 mode”, etc. The fan’s RPM signal is an OC(Open-Collector) circuit design (in most fan), so you’ll need a pull NOTE: For use the ESP8266-01 in Home Assistant there are 3 steps to do that are: 1) prepare your kit. To test if this the case, run i8kmon with verbose mode in a command line, make sure the CPU is idle, then see if the fan is turned off or turned down accordingly. , which The Advanced Fan Control strategy keeps into consideration the "Minimum value" and the "Maximum value" set in this tab. They don’t die literally; they just shut down and stop spinning, and that is why often the declared speed range of the fan can only be achieved by using PWM regulation. As we’ve seen previously, you can control the DC motor speed by applying a PWM signal to the enable pin of the L298N motor driver. Argus Monitor. 2 means that you have 50% and 100% while 100 will allow 1% increments in the output. speed_count ( Optional, int): Set the number of supported discrete speed levels. I was looking for something to control my ceilling fan speed at 220v, but I could find only modules that can control LED lights to control the brightness. cooling fans control (3 sensors/fans) Select a frequency for pulse width modulation. Ceiling Fan Speed Control, Rev. It regulates optimum air ow for ef cient cooling when necessary, and is effective for lowering power consumption and reducing equipment designated Fan Drive Control Assembly (FDCA). Please check that the 4-Pin fan header on your motherboard is PWM compatible. 51 added support for 5 PWM controls on the ITE IT8620E. I use a 9A mosfet. Then solder/crimp/twist another wire to that and connect it to the arduinos PWM 3 header. Wiring diagram for the ESP8266, DS18B20 and 12v fan. 69 mmH2O ± 10% Fan Life Expectancy 160,000 Hours Fan Noise Level 6. Ein Problem von I2C ist auch, dass das eig. 7 CFM (ft3 /mm) at only 26 dBA! SpeedFan 4. The PWM technique mainly used to control the brightness of the LED, speed of DC motor, controlling a servo motor, or in other cases, where have to generate an analog signal using a digital source. When PWM calls for 0, the minimum speed is set by the 100k variable resistor. ESP8266 PWM revisited (and reimplemented) Juni 29, 2016. Complete step by step guide on ESP32 PWM with examples . Any ATtiny, PIC or any ARM Cortex M0 based SoC fares better in this regard, although the smallest SoCs may have only one or two channels. The PWM signal from the motherboard sources 5V during the on state of the pulse, otherwise it's pulled to ground. Typically, this will be either 0 if it is OK for the fan to plain stop, or the same value as MINSTOP if you don't want the fan to ever stop. Yep. Virtually inaudible operation at max. Tried Speedfan, HWinfo, the bios, etc. i have automations on home assistant that at x temp it turns fan at x speed ,i'm a new to HA and ESPHome ,not a programmer , and i got this working very easy . The PWM signal is the control input of the PWM fan. Search this site. Raw. With built-in PWM capabilities the fans offer precise control for high airflow or quiet cooling configurations. Derale Performance is changing the rules of engine temperature control with Smart Technology brought to your car's cooling system through Derale's Patented PWM Fan Controller. 220v/110v AC Dimmer/Speed controller for ESP8266. If you are look for Ttgo Github, simply check out our links below : Tasmota rgbw Tasmota rgbw It's just one of the many hacking forums on the internet. A 2-wire fan is controlled by adjusting either the dc voltage or pulse width in low-frequency PWM. Thermaltake Commander FP 10 Port PWM Fan Hub Unboxing - How to Control Fan RPM SpeedI've never used a fan hub before and wanted something simple and easy to Fan Types: PWM vs. For more information, refer to our PWM Compatibility Guide. The objective of this post is to explain basics of IR protocols of remote controls and to learn how to remote control an air conditioner using an IR Led with an ESP8266 NodeMcu. Fan tachometer input to measure FAN2 fan speed. It meets all the requirements to be a perfect choice for heat sinks, PC cases and radiators. Find your PWM settings. ESP8266 Based Webserver to Control LED from Webpage. yaml. This HomeKit Switch will create a simple smart home control for the whole family: anyone in the home can control multiple smart home devices wirelessly with the press of a button instead of resorting to a smartphone app. A small OLED screen shows the status of the air and temperature. 47 - 1. PWM. Controlling the fan works fine, just one of my test fans is not turning off completly but that does not matter for now. The point of this guide is to show the latest and greatest in fan control technology on Intel Z270 motherboards and to help you understand what each brand has to offer The PWM Controller in ESP32 consists of two main sub-modules: LED Control or LEDC Peripheral and Motor Control Pulse Width Modulator or MCPWM Peripheral. This project consists of three sections. On Duet 3, there are 4-pin fan headers specifically for these kinds of fan. Star. GPIO library. cheaptech. Black White. The wiring looks like this. This on-off pattern can simulate voltages in between full on (3. Certainly, if ha had turned sprinklers on, expect an exorbitant water bill. For our Tegra based modules, the PWM LED interface is used to export the PWM channels PWM<B> through PWM<D>, located at /sys/class/leds/. analog input to measure speed of a 2-wire fan via a sense resistor (2 typical). I had 5 laying around and thought mine as well give it a shot. If this value isn't defined, it defaults to 0 (stopped fan). 3 Volts) and off (0 Volts) by changing the portion of the time the signal spends on versus the time sp903 rgb pwm fans and rgb hub for aura, fusion and mystic. To control fan speed, we use a software PWM signal from the RPi. With low-frequency PWM, the fan only produces a tachometric output when running and—as a result—cannot produce continuous feedback about the motor speed. ESP8266 NodeMCU. ESPHome PWM fan using a Wemos D1 mini lite. Fan RPM. 4 Pulse Width Modulation (PWM) A pulse width modulation (PWM) signa l is generated by using the timer and the comparator. 25 " Front Panel Display 6 channels Fan Controller compatibile 3 pin 4 pin PWM fan with LED indicatore,20W available for each fan control channel Fan speed control to zero RPM. # Controlling my Buva Qstream ventilation system using: # * A Wemos D1 mini lite (an ESP8266 based board) # * A Wemos power shield so I can power the Wemos from the ventilation units 12V supply. Use the calib_fan. Digital Control. Tasmota Pwm Fan. 5% (100/64). So, in order to control fan speed of your computer, the HWMonitor would be a good choice. The controller performs the following tasks: • The controller is constantly checking for zero crossings through the comparator Together with PWM Smart Fan Speed Control, that carefully adjusts fan speed according to system temperature, you have an effective and efficient solution for balancing cooling capacity and noise. Set the duty cycle or pulse width. blue. The MLX90287 provides a simple solution for controlling cooling fan speed via digital or analog techniques. A simple python script to control a fan from Home Assistant. 45v on the fan due to the C-E voltage drop across Q1. Remember though, the post 7 circuit is linear when PWM calls for 0 fan speed and you have the 100k set to keep Q1 partially on. The circuit utilizes the mode 10 PWM phase-correct on timer 1 OCR1A (Pin 9) and ICR1 (Pin 10). Hayden's digital fan controller incorporates pulse width technology. A PWM Signal is well adapted to drive electric motors, as their reaction time is very high compared to the PWM frequency. With a 72MHz clock rate, a PWM output can have maximum period of about one millisecond. The duty-cycle variation of PWM_OUT from 0% to 100% is divided into 64 steps. Based on the tachometer readings, you can Digital PWM Fan Controller P/N 3655. py program to find the FAN_MIN value by running in the terminal: python calib_fan. Re: PWM fan (2-wire) woes guidance needed. cp436 4-channel fan control for pci slot Control (PWM) is the input for PWM pulses. The rack is placed in a closed garage, so the temperature range between winter and summer is pretty high, and also dust could be a problem. When I try to read the tacho signal of the fan, I get awkward readings. ESP8266 WiFi fan controller (EasyIoT Coud) In this tutorial we will show how to build WiFi fan controller. 7 x 1 inch Fan Speed 800-1400 RPM (PWM) ± 10% Fan Airflow 16. ESP8266 Software PWM Output. On web there are a lot of kits that include relay, temperature and humidity sensor and more, all based on ESP8266-01s or ESP8266-01 WiFi module, see here. turing it on\off, set temperature or fan speed). When the fan is turning I get values between 30k and 40k, When it stands still its 0. Hardware PWMs like the one on the ESP32 (see ESP32 LEDC Output) are preferred. To control the backlight, one can use the backlight sysfs interface: Colibri T20/T30 and Apalis T30. I wrote some code to control and read the fan speed of a 4pin PWM fan. Found that any breakdown in wifi between ha server and ESPHome widget left confusion between ha and widget state if/when comms was re-established. Can be reprogrammed as an A 2-wire fan is controlled by adjusting either the dc voltage or pulse width in low-frequency PWM. This means that if the computations based on the temperature response curves lead to, say, a PWM value of 30%, but the SPEEDS tab defines 45% as the minimum value for that PWM, 45% will be used instead. You can also set the PWM duty cycle for each of the fan zones. With adjustable set points between 120˚F-210˚F, this digital controller has no contacts to wear out and no Well, almost all fans „die“ if the voltage is lowered under 5V, but with PWM control, the fans can reach really low operation speeds of 300-600 RPM. , approximately 1. 7 x 4. @milkshakes for 4-wire fans, i cannot answer, because i have to know the minimum current required for each fan for the PWM input, as well as the maximum current the 555 can sink through the discharrge pin (7). The PWM speed control function is a function that externally controls the rotation speed of the fan by changing the duty of the input pulse signal between the control terminal and GND. 5. Even though we will be limiting our demonstration of PWM in ESP32 to fading an LED, it is good to know about the Motor Control PWM (MCPWM) block in ESP32, with input capture modules. The control monitors the head pressure by sensing the sub-cooled liquid line temperature. 0 Freescale Semiconductor 7 4. green. To control the duty cycle, the sysfs brightness file can be used. Here, we are using ESP8266 NodeMCU to connect with ThingSpeak IoT cloud Platform. The ESP can sense the speed of the fan to determine which setting it is on using an led and photo-transistor. Control the speed of a DC motor without sacrificing torque. 02, 2015: Application note. Below is the ESPHome code running my fans (I have two sets of fans run from one ESP) MQTT client to control a PWM fan from a raspberry pi. 3-Pin fans are usually fixed-speed fans, they can however be voltage controlled when the motherboard allows it. Compatibility: 5. Requires pullup resistor (10 k typical). SKU CO-9050136-WWiCUE SP120 RGB ELITE Performance 120mm White PWM Fan — Single Pack. For 3-wire fans, it can control as much as the Q1 can handle. A ESP8266 with ESPHOME comfortable design, which monitors the PM2. If your fan doesn’t support PWM control, then you can see #138 Variable Speed Cooling Fan for Raspberry Pi using PWM and PID controller or PWM Regulated Fan Based on CPU Temperature for Raspberry Pi to use a BJT transistor to use PWM control. g. Each "zone" is set seperately using the following command: ipmitool raw 0x30 0x70 0x66 0x01 0x<z> 0x<n> - where "z" is the zone (0 0r 1) As outlined in the video below, if you’re using a PWM fan, all you have to do is connect it’s power lead to one of the Pi’s 5V pins, ground to ground, and the PWM lead to a GPIO pin as specified below. The greater performance combined with PWM automatic speed control allows the fan noise to be kept to a minimum. The 3-wire fan has a tacho signal, which indicates the speed of the fan. In this Project we will explain how to remote control air conditioners (i. E. You control this signal with a microcontroller or any other digital circuit. e. cooling fans control (3 sensors/fans) The PWM value to use when the temperature is below MINTEMP. I have been wondering about this project and how to control my 4 pin PWM fans. Three-wire motors can work with either DC voltage control or low-frequency pulse-width modulation. ¶. Second section reads the DHT11 sensor module’s output and extracts temperature value into a suitable number in Celsiu s scale and control the fan speed by using PWM, analog or temperature speed control. HDD Fan control is a command line tool to dynamically control fan speed according to hard drive temperature on Linux. USD$79. A cooling pad for laptop. The FDC electronics module supports the designated Fan Drive Control Manifold (FDCM) up to three analog temperature input signals, one engine computer PWM input The PWM value to use when the temperature is below MINTEMP. Assign a digital pin to select the PWM channel. 3v, GND and a GPIO pin to the MOSFET. However, with only two wires, a tach signal is not readily available. The ESP8266 Software PWM platform allows you to use a software PWM on the pins GPIO0-GPIO16 on your ESP8266. Note: I have replaced this Raspberry based solution with an Wemos/ESPHome based one you can find here: ESP8266 WiFi fan controller (EasyIoT Coud) In this tutorial we will show how to build WiFi fan controller. details. Model #: 4744374580893. 4dB (A) 6-pole fan motor for less power consumption and vibration. py Adding ESPHome to your Home Assistant instance can be done via the user interface, by using this My button: ESPHome can be auto-discovered by Home Assistant. Juni 29, 2016. Used to measure RPM; Blue: PWM control signal at 5V, 25kHz The HomeKit Switch help control other HomeKit accessories like lights or fans. This suits perfectly the latest systems using typically 25 KHz or above and older systems The PWM speed control function is a function that externally controls the rotation speed of the fan by changing the duty of the input pulse signal between the control terminal and GND. Some newer laptops have BIOS fan control in place which will override the OS level fan control. This means that there is no indication as to how fast the fan is running—or indeed, if it is running at all. Electric Fans. Historically, cooling fans run at 100%, even when less airflow is needed, constantly turning on and off as the engine temperature changes. Because fans will slow down or stop when not needed: it minimizes noise generated by the Dell 7567 Inspiron 7000 FAN SPEED CONTROL. Fan Size. direction_output ( Optional, ID ): The id of the output to use for the direction state of the fan. # * A simple PWM to 10V convertor like this: https://www. PWM is a technique by using which we can control voltage. On Duet 2, the recommended connections are: Red (or yellow, if there is no red wire) and black wires: connect them to the + and - pins respectively of an always-on fan connector. Fan Dimensions (L x W x H) 120 x 120 x 25 mm / 4. PWM fans are 4-pin fans, where the fourth wire sends a PWM signal to the fan motor. It directly accepts, without any external circuitry, a wide PWM frequency range from 100 Hz to 100 KHz. Material: Aluminum. ventilation. Why did you make it? I Wanted a cheaper air filter for my house that I could control how I wanted. Akasa 140mm x 25mm Apache Black Super Silent PWM Fan w/ Hydro Dynamic Bearings - Black (AK-FN062) Super silent 14cm fan with S-FLOW blades supplying 30% more airflow than a standard fan at the same speed. Controller can monitor temperature and in case of temperature increase power on the fan. Then you're done, I've connected 3 fans to the same header and it works fine so far. If the BIOS fan control is in place, you can try using dell-bios-fan-control-git AUR: 🎵 🌈 Real-time LED strip music visualization running on ESP32 based on Arduino or ESPHome platform PWM fan control. After several tests on multiple motherboards, SpeedFan became able to control the speed of up to 5 fans using PWM. No menu assigned; Uncategorized esphome home assistant Search: Ttgo Github. PWM motor control feature. Another option is to use the original control board and have the ESP electronically press the button a person would press. Read more. Connect a 12VDC power supply to the MOSFET, connect two wires from the PWM fan to the MOSFET. MAXPWM The PWM value to use when the temperature is over MAXTEMP. It will give you more temperature sensors and more fine-grained control over your fans, namely in 256 PWM steps rather than the fixed steps "0-7 and 127" with the legacy devices. and can't get PWM control or to setup my own fan control curve. It has 16-bit PWM resolution (2 16 ), that is counters and variables can be as large as 65535. Note that this is a software PWM, so there can be some flickering during periods of high WiFi activity. This has 3 benefits: it allows maintaining your hard drives in the ideal temperature range to have maximum longevity and avoid overheating. Digital control is used to create a square wave, a signal switched between on and off. ESP series WiFi module becomes very popular among hobbyists and industries for IoT based projects. Tried ESPHome to control sprinklers. Housing Color. We can connect up to 3 PWM fans to a single Arduino. 2) install in Home Assistant the ESPHome. Pure Plus 14 RGB Radiator Fan TT Premium Edition (3-Fan Pack) 140mm PWM controlled fan with a patented 16. This is the pinout of a standard PWM fan: Black: Ground; Yellow: +5V, +12V or +24V (depends on fan model, usually 12V for desktops, 5V for laptops) Green: Sense. It regulates optimum air ow for ef cient cooling when necessary, and is effective for lowering power consumption and reducing equipment This electronic head pressure control modulates condenser fan motor speed thereby varying the air volume through the condenser. it Esphome Pwm. To use PWM with the ESP32, you need to set the PWM signal properties first. 16. Voltage. ESP8266 Wi-Fi transceiver is one of the most used module for IoT based Applications. nl The ESP8266 is used to control the mosfet module which bridges the power between the fan and the power supply. Pulse Width Modulation, or PWM, is a technique for getting analog results with digital means. The speed will be proportional to the duty cycle. H66F hub comes with PWM control functions for optimized fan speed to maximize cooling efficiency and minimize noise. com Fork 3. per second, whereas the comparisons with fan-control thresholds THIGH and TLOW are done once every 4s. The speed of the fan is controlled using PWM (Pulse Width Modulation) by switching the power on and off rapidly. For simpler fans with only a power and ground input, you’ll need to add a transistor to provide it with enough current. 5 and PM10 levels and can adjust the fan speed based on PWM standard fan connector. in my opinion ,the best solution would be to add ESP32/8266 with ESPHome to your Exhaust Blower utilizing the PWM to control motor speed . ESP32 provides 16 PWM channels. Average, a PC fan draws some 400mA, so i could run 20 PWM Controllers. The ESP8266 lacks any hardware support for PWM.

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