WetterCube/Hardware/en

Dies ist die englische Fassung. Zur deutschen Fassung

⚠️ Power and safety: Only run the device with a tested power supply of the stated voltage and pay attention to correct wiring; mistakes can destroy parts or cause heat. Do not use for safety-critical purposes. You act at your own risk, see the usage notes.

Note on assembly: The WetterCube is aimed at people with some knowledge of electronics: during assembly, cables have to be crimped and parts soldered. If you do not want that, the WetterCube Fusion is the better choice. That is why, for the newer devices (Fusion and Next), I rely on complete boards with an integrated display: building is easy even for people who know nothing about wiring up an ESP32 and the like.

Components

Component	Type
Microcontroller	ESP32-C3 Super Mini
Display	ST7789, 1.54", 240×240 px, SPI
Button	TTP223 (capacitive touch sensor)
Case	Simple Print Monitor – ST7789 1.54" Display Case by Keralots (3D print, Bambu Makerworld)

Pin assignment (ESP32-C3)

Function	GPIO
TFT MOSI (SPI)	20
TFT SCLK (SPI)	21
TFT CS	6
TFT DC	7
TFT RST	10
TFT backlight	5
Touch button (TTP223)	3

The backlight is regulated with PWM (5 kHz, 8 bit), which makes brightness, dimming and night mode possible. The wiring diagram is shown right below.

Wiring diagram: display, ESP32-C3 Super Mini and touch sensor (TTP223).

Assembly in the case

What the assembly can look like: display in the case, ESP32-C3 Super Mini in the lid, the touch button (red board) glued in on the left of the case.

Tip: Glue the touch button (TTP223) to the inside of the top of the case, for example with some liquid electrical tape or silicone.

Power supply

The ESP32-C3 Super Mini is powered via USB-C; an ordinary 5 V USB supply is sufficient. A very thin or long cable can cause dropouts when transmitting over Wi-Fi.

Notes

Output in the serial monitor (115200 baud) comes via the board's USB port. In normal operation the /log in the browser is enough, no USB cable needed.
The cube has a single button and no touchscreen. Operation: Screens and features.