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  • Author Author: AB9NQ-William
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EoRa-S3-900TB with FreeRTOS — LoRa Camera Control System --Avg 174 µA

AB9NQ-William

A long-range wireless camera battery control system built on the EoRa-S3-900TB development board (ESP32-S3 + SX1262 LoRa). A FreeRTOS-based Transmitter (TX) sends commands over LoRa to a deep-sleep Receiver (RX) that controls camera power via a KY-002S bi-stable latching switch.

One complete on-off cycle

Nordic Power Profiler Kit II, observations from "EoRa-S3-900TB-with-FreeRTOS" project

Observation 1 of radio.sleep() between switch on and switch off.

Observation 2 of normal EXT0, deep sleep.

"EoRa-S3-900TB with FreeRTOS " project README

Regards,

William

  • Before moving to the apartment; there was a wetland pond behind our backyard; we had a Wyse Cam 3 mounted above our shed. Camera had to be powered by a 10,000 mAH power bank; barely would get ~24 hours of continuous use before swapping out the power bank.  What I needed was a way to only power the camera only when there is a web request from my domain hosted, web site videofeed link.  Clicking Observations II link brings the viewer back to the main menu.

    Project uses a LoRa transmitter on mains power and a battery, powered LoRa receiver.  Lora transmitter receives web request. sends Lora preamble and payload.  Wake on radio, preamble wakes deep sleeping Ebyte, EoRa-S3-900TB (ESP32S3 with LoRa SX1262 on dev board), turns on power bank, sets EXT0 wakeup by timer for viewing live Wyse Cam 3 viewing “videofeed”, calls radio.sleep() to power down LoRa radio, receiver goes to sleep until wake up timer expires. Receiver wakes, inits the LoRa radio bringing LoRa radio out of radio.sleep(); which has no transmit and no listening, LoRa radio is put back into autoDutyCycle (no parameters) to listen for the next web request.

    AutoDutyCycle is responsible for the ~174 µA resulting average current reading.  When listening for 9 ms, it consumes 11 mA.  Current consumed between the “spikes” is ~17 to ~18 µA during radio.sleep()!

    Nordic Power Profiler Kit II Observations

    NPPK II_Battery Life Analysis

    I did this project for the open-source community; in five days on Github; has already been cloned 376 times!

    William,