IOT Smart Drybox

This is a wifi-enabled smart filament drybox.

Monitor humidity and temperature inside your drybox, and automatically turn heating on/off based in your parameters.

Accessible via mDNS, LLMNR, SSDP, NETBIOS and direct IP.

Firmware available at https://github.com/jmgk77/HTMON

Parts:

• wemos d1 mini
• oled 0.96 ssd1306
• 1 channel relay shield
• sht30 temperature and humidity sensor
• HLK-PM01 (5V) mini power supply
• Oven Light Bulb (or another heater)

How to:

Connect the wemos d1 mini to the oled display and the sht30 sensor via i2c. Run a wire from the wemos d1 mini to the relay, and connect the relay to the heater. Connect HLK-PM01 to the main power, and the 5v lines to the wemos d1 mini, display, sensor and relay.

Compile the firmware using Platform.io, and upload it via USB to the wemos d1 mini the first time. Subsequent updates can be made over-the-air via the www interface.

At first boot, a new wifi network HTMON will be created. Connect to it, and there choose your wifi network and enter your credentials, that will be saved. After this, you can connect via http://htmon.local, http://htmon, Windows Explorer Network tab, NETBIOS or direct IP to the device.

In the main www page, you will find a graph of humidity and temperature. In the configuration www page, you can reboot, reset and update the firmware of the device, set the startup heater status, and set the automatic max/min humidity and temperature activation parameters.

It has a hardcoded safety thermal shutdown at 60°C.

Drybox

I provided a simple drybox design, but the monitor/control box is compatible with all drybox you will find here.

In a compatible box, install the supports (i use a 25mm pvc tube), the PFTE filament output, the oven light bulb suport, the control box and the power box.

Optionally, put silica or other dissecant in the bottom of the drybox, to help remove moisture.

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