plantineers / edge Goto Github PK

Saving power when the device is not in use for multiple minutes is very worthwhile. We could use the built-in sleep modes of the esp to wake it up after a time interval saving massive amounts of power. Also we could use rtc memory to store data that is persistent during even deep sleep.

Unfortunately light/deep sleep doesn't seem supported in esp-hal yet. We could also use esp-idf, which would no longer use the pure rust bindings.

Query all present sensors every 5 minutes

Currently our json packets are definitely going to be too large to get sent via ESP-Now. To avoid this we should use binary serialization. We can use https://github.com/jamesmunns/postcard for that.

Make a simple Gateway to forward the ESP-Now Requests to HTTP for the server

This changes a lot about the code. We could still make the microcontrollers sleep to save power(#3) and would not have to deal with connectivity issues/unreliability of connections.

The most common RTOS to develop applications with on the esp32c3 is FreeRTOS. This has Rust bindings and would probably support deep/light sleep and give us higher level abstractions, however the project would no longer be bare-metal.

For saving the UUID for example

Currently we have the problem that esp-now is screwing up timings. While this is fine for I2C and the tsl2591 it screws up the timings on pretty much all sensors needing a delay. Since the esp32c3 doesn't have a second core we cannot just switch to another core.

We have two ways really here and both seem hard and time-intensive:

• Rewrite the project for an ESP with multiple cores(the original ESP32 comes to mind but i haven't had luck with spawning something on the other CPU core while wifi is running so a quick PoC would be necessary in order to justify the attempt)(takes less time)(useful link)
• Get some way to have more accuracy despite having wifi started on the same CPU(I doubt this is possible and do not know how to even attempt this...)
• Turn wifi on and off(have to look into if that is even possible but would be the easiest way)

I guess we're gonna have to use the rng peripheral much for this one to generate the UUIDs at first start.
This shows how to use the onboard rng:
https://github.com/esp-rs/esp-hal/blob/main/esp32c3-hal/examples/rng.rs

• Soil Humidity sensor (https://www.berrybase.de/seeed-grove-bodenfeuchte-sensor)
• IR Sensor ( https://www.rasppishop.de/IR-Sensor-Infrarot-Empfaenger-TSOP38238-VISHAY )
• Temperature Sensor ( https://www.berrybase.de/seeed-grove-temperatur-luftfeuchte-sensor-dht11 )
• Nitrate Sensor (https://de.aliexpress.com/item/1005001524845572.html?aff_fcid=736855c9fca547b8b29c3c110c52c6ae-1682099587917-09566-_DC5Ba91&tt=CPS_NORMAL&aff_fsk=_DC5Ba91&aff_platform=shareComponent-detail&sk=_DC5Ba91&aff_trace_key=736855c9fca547b8b29c3c110c52c6ae-1682099587917-09566-_DC5Ba91&terminal_id=4a3221930efc477386b018027472ccf5&afSmartRedirect=y)
• Light Sensor ( https://www.berrybase.de/lilypad-light-sensor )