Having a system in your living room that displays weather information and facts is handy, and setting up one particular of people is a great venture if you appreciate tinkering with microcontrollers and environmental sensors. It is also a wonderful way to understand about reduced-electrical power structure, as [x-labz] demonstrated with their e-ink weather conditions station which will work for no less than 60 times on a one battery charge. It has a obvious screen that exhibits the community temperature and humidity, as well as the weather conditions forecast for the working day.
The screen is a 4.2″ e-paper module with a resolution of 400 x 300 pixels. It takes advantage of just 26 mW of electric power for a couple seconds when it updates its graphic, and fundamentally zero watts when demonstrating a static picture. It’s pushed by a tiny ESP32C3 processor board, which downloads the weather conditions forecast from weatherapi.com each two several hours. The indoor local climate is calculated by an SHT-21 temperature and humidity sensor mounted behind the display screen, while the out of doors info is gathered by a WiFi-connected sensor mounted on [x-labz]’s balcony.
To further more cut down electric power intake, the CPU main is driven at the most affordable possible clock pace at all periods: 10 MHz when reading the indoor sensor, and 80 MHz when using the WiFi link. All of this will help assure that just 1 600 mAh lithium battery can preserve all the things jogging for all those 60 times.
E-ink shows are perfect for text and easy graphics that really don’t change too usually, which is why they are pretty preferred in temperature stations. With a bit of tweaking though, LCDs can also be optimized for lower electric power.
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