You are reading a single comment by @MichaelPralow and its replies.
Click here to read the full conversation.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@MichaelPralow
i managed the power activation/deactivation by using a NPN transistor (2n 3904 in TO-92 form, usable for breadboards) which is controlled by one of the Espruino Pico GPIOs
with this i measured values of around 4 - 16mA for the display alone
with a circuit with Pico, the e-Paper and a refresh cycle every 3 minutes i got ca. 48 hours(like 960 cycles) of one CR2032 (cheap one), after that the Pico red LED keeps flashing, i guess the voltage is too low - i measured 2.8v left
one problem i face is the combination of the 32mA for the Pico and the ~4-16mA for the display, ~50mA peaks, even for short times, are a lot for a single coin cell, it might be better to use capacitors and a voltage boost regulator or just 2 coin cells
for me it was really interesting to work this out, as the display is rather large i am ok with using a larger power supply like a small lipo battery 3.7v (smaller than the display)