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I'm investigating for some function of Lora E32-TTL-100. Currently, I can communicate between two E32 like the following image: enter image description here But 3 days ago, I saw a person used only one MCU to scan the other E32 is power-on or power-off: enter image description here It's so interesting, and tried many way, but wasn't successful. I found many documents but they always mention communicate 2 MCUs + 2 Loras.

Again, the purpose is how to do for the 1st E32 know that the 2nd E32 is power-on. Can anyone please help me with it or have any ideas about it?

This's the link I followed https://www.mischianti.org/2019/11/10/lora-e32-device-for-arduino-esp32-or-esp8266-fixed-transmission-part-4/

This is the schema to simulate it: schema Thank.

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  • please post a link to what you saw 3 days ago Commented Nov 5, 2020 at 4:19
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    @jsotola, I saw my teacher done it like the above images. We will know that the 2nd is power-off, the 2nd, 3rd E32 is power-on. I'm not sure about how to implement it. I also ask my teacher, but he said that I should find the solutions for it. but no hope. Commented Nov 5, 2020 at 4:38

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