A small 3-in-one thermometer, barometer and gigrometer for indoor use. Built with ch32v003 MCU, BME280 sensor and vk16k33 i2c 14-segment display modules.
When powered on, the device starts cycling through 3 screens: Temperature in Celsius, Humidity and air pressure in mm Hg.
- To set the brightness, rotate the encoder.
- To set the screen change interval, press and hold the encoder for 2+ seconds, choose the desired interval from 5s to 60 min and then click it again.
- To force the immediate screen change, click the encoder.
Assembly is pretty straightforward. You should just note that PCB is a little bit redundant. A first my idea was to add an LDR resistor, but i've abandoned that idea later. So you can omit R_LDR and J_LDR. The firmware doesn't use them. I've also made some extra pins availiable as J_EXT. Feel free to use them to extend functionality if you want.
You will need ch32v00fun and funny_libs to build it. I prefer using official WCH toolchain. If you prefer using vanilla risc-v GCC, then remove #define WCH_FAST_INTERRUPT_ENABLED from funny_defs.h.
