Joe Orbons asked 2 years ago
Hello Sara and Rui,
As a frequent and happy user of your courses I would like to have your advice, tips etc. on connecting a ESP8266 esp-now sensor network to a TTGO ESP32 LORA, that works as ESP-NOW receiver and LORA-sender. This LORA sensor connects to Things Stack network as OTAA device. I’ve managed to get it working, but without implementing deep sleep.
I couldn’t find, examples and/or libraries of systems that implement deep sleep in a way that would suit this project. Most of the time I “reengineer” the work the very nice people that share there knowledge github, youtube …..
I’m imagining a systen consisting of a many-to-one ESP-NOW ESP8266 sensor network. The slave of this network collects the sensor readings, writes it in one record (structure) and sends this record in a timely fashion to the LORA sender(TTGO). The system is meant for a community garden so should battery operated. It is possible to connect the slave ESP8266 to a small solar panel, in case this would be an advantage (less complex) to keep it alive 24 hours.
I hope you can point in the right direction and give me a headstart.
Kind regards and keep up your good work
Joe Orbons
Sara Santos Staff answered 2 years ago
Hi.
In what way do you want to implement deep sleep? In which boards? What sleep pattern? What’s the wake-up method you want to use?
Regards,
Sara
Joe Orbons answered 2 years ago
Hello Sara,
Thanks for the quick answer.
In what way do you want to implement deep sleep?
Deep Sleep in an ESP-NOW network
In which boards?
Wemos d1 mini ESP8266 and TTGO ESP32 LORA Oled.
What sleep pattern?
A pattern that is able to update sensors readings every 10 minutes.
What’s the wake-up method you want to use?
The best wake-up method would be that the
- Wemos d1 wakes up every 10 minutes on timer
- Wemos d1 wakes up TTGO and sends its readings (eg temperature, humidity …..) via ESP-NOW
- TTGO reads ESP-NOW sensor readings
- Wemos goes to deep sleep
- TTGO join TTS network and uplinks the sensor readings
- TTGO goes to deep sleep until woken up by Wemos 10 minutes later
Kind regards
Joe
Sara Santos Staff answered 2 years ago
Hi.
You can easily put the Wemos D1 mini to sleep every 10 minutes and send readings every time it wakes up. You can easily do that with a timer wake-up. Check the following tutorial:https://randomnerdtutorials.com/esp8266-deep-sleep-with-arduino-ide/
Unfortunately, the receiver board (the TTGO in your case) can’t be woken up wirelessly by the other board. It can either be awakened by a timer or via a physical signal.
A workaround is to use MQTT with retained messages and awake the boards with a timer. In that case, when the receiver wakes up, it can check with the broker if it received the last message. With ESP-NOW that doesn’t happen. If the recipient didn’t get the message, it won’t be saved anywhere else.
I hope this is clear.
Let me know if you need further help.
Regards,
Sara
Joe Orbons answered 2 years ago
Hi Sara,
I will give it another try, with the info you gave me. I’ll post here my findings!
Regards and thanks
Joe