The M5stack is interesting but many details and specs are missing. Perhaps the makers can help:
- what is the power consumption when OFF ? Does pressing the power switch twice actually shut the device OFF -> power is zero ?
- what the power consumption in deep_sleep ? I get variable amount from 17 to 40mA using a USB power meter with no battery.
- Is is possible to measure battery voltage ?
The M5stack is a battery powered device but very little support exists for conserving battery power, saving power, and estimating remaining battery life.