Deep Sleep and Battery Optimisation
Measure active/sleep current, duty cycle and wake reliability to estimate realistic battery life.
Arduino-compatible frameworks, ESP-IDF/FreeRTOS, PIC/AVR/STM32/RP-class systems; apply exact vendor documentation for the selected MCU.Architecture
Wake source → boot/restore → bounded measurement/transmit → safe persistence → deep sleep.
Security and recovery risks
- Battery calculations are estimates; validate temperature, ageing and self-discharge.nRetained data needs version/CRC.nNever sacrifice required safety monitoring for sleep current.
Implementation procedure
- Measure active and sleep current on hardware.nRemove floating inputs and unnecessary peripherals.nMinimise radio-on time and failed connection waits.nUse the duty-cycle calculator below.nTest wake sources, clock drift and low-battery behaviour.
Starter code / configuration
sleep_until(next_deadline);Verification evidence
| Test | Expected | Evidence |
|---|---|---|
| Nominal boot | Correct version and hardware revision reported | Captured boot log |
| Fault recovery | Defined safe state and reset reason | Fault-injection record |
| Power cycle | No corrupt configuration or unsafe output | Repeated-cycle log |
Required release artifacts
- Versioned firmware binary and SHA-256
- Source revision / build identifier
- Board and hardware-revision compatibility list
- Test report and known limitations
- Recovery image and factory-reset procedure
- Provisioning/calibration schema
- Release approval record
Local browser tools
Firmware production workbench
A/B update exercise
OTA and automatic rollback simulator
Advance one validated stage at a time. A failed boot test returns the device to the previous slot.
- Running confirmed firmware from Slot A.
Release gate
Production-readiness checklist
A downloadable release decision is generated only after every mandatory control is confirmed.