Wiznet makers

IOT Fan Controller based on RP2040 W5000 board from WizNet(WizNet W5100S Rp2040)

Controls PWM fan based on environment temperature read through a DS18B20 sensor. Uses three presets to select fan speed, and a night time override speed to reduce night time noise.

Device is based on my TwinThing framework (see twinThingRP2040W5x00 and TwinThingPyMQTT). The device does not persist status or configuration in flash memory but instead publishes its state to a MQTT shadow service, which can update the device to current configuration when it attaches to the network.

Hardware

• WizNet W5100S Rp2040
• RGB Common Cathode LED
• 3x Resistors 91R
• DS20B18 temperature sensor
• Resistor 4.7K
• RotaryEncoder with Push Switch
• 2x 10nF Capacitor for smoothing
• OLED display 128x32 SSD1306
• 2x 80mm 12V PWM controllable fans

Dependencies

C++

• FreeRTOS-Kernel: Task management
• FreeRTOS-CoreMQTT-Agent: MQTT Library
• ioLibary_Driver: Drivers for W5100s
• twinThingRP2040W5x00
• json-maker: JSON writing for comms
• tiny-json: JSON parser
• RP2040PIO-DS18B20: Sensor library
• pico-ssd1306: Oled Driver
• RtosComponents: Watchdog module

MQTT hub

• EMQX

MQTT Services

• TwinManager

Folder Structur

• src - source code for the project
• lib - libraries used by the project
• port - port code needed for the libraries used by the project
• patches - patch files produced by WizNet for the ioLibrary_Driver lib
• py - test python to interact with the IOT devices
• schematic - Circuit schematic (no PCB design as build on prototype board)
• 3dModels - STL files for PCB bracket, fan cover, OLED housing and Rotary Encoder housing

Clone and Build

Clone

''' git clone --recurse-submodules https://github.com/jondurrant/IoTFanControlerW5000 '''

Build

''' mkdir build cd build cmake .. make '''