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Remote LED flash detector of the electricity meter

efi222 9639 63
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
  • #61 21169931
    efi222
    Level 19  
    Light sensors with photoresist work successfully in freezing weather. In the case of this device, the response is to a large light spike, so the hysteresis margin is considerable.
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  • #62 21169952
    khoam
    Level 42  
    efi222 wrote:
    In the case of this device, the response is to a large spike in light, so the hysteresis reserve is considerable.
    .
    What hysteresis is involved? The photoresistor itself has no hysteresis. The resistance of the photoresistor depends on both light and temperature. Changes in temperature can introduce additional delays or changes in the characteristics of the photoresistor, which may give the illusion of hysteresis, but is not.
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  • #63 21169975
    efi222
    Level 19  
    I am concerned with the operation of the whole circuit with the comparator. Changing the resistance of the photoresist causes the bridge to be unbalanced and the comparator to overshoot. With the correct choice of resistance in the bridge, small changes in photoresistance should not affect the operation of the circuit.
    I would also add that the photoresistor operates in two states. Bright/dark. If the operating point of the comparator is set between these states, the resistance 'drift' would have to be really large for something worrying to happen.
  • #64 21174403
    korteksik
    Level 10  
    A similar project was described in EP 7/2019:
    Link .

Topic summary

A user has developed a wireless LED flash detector for monitoring electricity consumption using an ESP8266 chip and the ESP NOW protocol. The device captures LED flashes from the electricity meter, indicating current power consumption in kilowatts (kW). The system operates in deep sleep mode to minimize power usage, with a current draw of approximately 160uA. Discussions include the effectiveness of the photoresistor used, battery life estimates with a 18650 battery, and the potential for using alternative communication protocols like Zigbee. Participants also discuss the limitations of the device in measuring instantaneous power versus cumulative energy consumption, and the challenges of implementing wired solutions in existing setups.
Summary generated by the language model.
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