i already made a paper display using a wemos pico (has battery, charging and indicator) but this is very cool!
have to charge mine every few months but also display a lot more information
have to charge mine every few months but also display a lot more information
except for the wemos lolin c3 pico, very tiny esp
In hibernation with only the RTC clock running I believe it only consumes 0.008mA which is coin cell worthy with a < 1% duty cycle. With the wemos boards my lowest is around 3-4mA which is still fine but considering price is the same I would recommend the firebeetle ones.