ESP32: drive a low-power e-paper display
Drive a 2.9-inch e-ink panel with an ESP32: crisp static text, months on a battery, and the refresh rules that keep the panel alive.
Tag
#low-power
4 tutorials
ESP32: RTC memory, the fast persistent storage that survives deep sleep
Use RTC_DATA_ATTR to keep state across deep sleep on the ESP32. Boot counters, last-known sensor values, and the gotcha that it does not survive a power cycle.
ESP32: dev boards vs bare modules, the right pick for battery projects
When to use a $5 dev board and when to drop down to the bare ESP32 module. The tradeoffs that matter for battery, size, and cost.
ESP32: deep sleep and battery life, the honest numbers
Put an ESP32 into deep sleep and measure the actual current draw with a multimeter. Includes what to expect on different boards and battery chemistries.