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Hardware Issues/ Enhancements

  • ISSUE Stronger power supply. 5V operation works, but 3.3V battery does not. Starting to see evidence that this may be an issue with my build. Need to keep open minded.
  • ENHANCEMENT Hall Effect sensors on measurement devices
  • ENHANCEMENT I2C based counters for rainfall and wind anemometer revolution count
  • ENHANCEMENT Full low current analysis
    • Mount ESP32 on PCB and keep only what I need in the design

Troubleshooting

  1. When RESET or initial power on happens on non 5V USB power (using LiIon battery and MCP1700)

    1. WiFi radio begin() will fail and system reboots

    2. second connect will pass

    3. sequence fails again after deep sleep and timer WAKE

  2. TODO: Scope 3.3V supply and look for any signs of droop

    1. monitor regulator output and 3V3 pin on dev module

  3. Observed that fully charged battery will RESET controller after deep sleep, but as voltage gets < ~4.1V controller stops resetting.

  4. 4:30am - Experiment start

5:55am - checkpoint before work

More data to follow. This is a placeholder chart. I expect to see /boot/ topic to start to increase when batteryVoltage goes down.

  • waking from deep sleep every 30sec to accelerate current consumption

Long term TODO:

  • Hall Effect sensor based wind and rainfall measurement
  • I2C based wind counter, easier to periodically read instantaneous wind values with ULP
  • Layout ESP32 on main PCB, get rid of the dev module entirely
    • Really attack the deep sleep current support
    • Add FET switch for powering down all peripherals while in deep sleep
    • No power LED constantly drawing current
    • LoRaWAN stack
    •  

Log of efforts

Power supply reboot debug issue

Ordered 500mA LDO’s from Microchip. TC1262 (qty 10)

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