@mrussi I am also interested in using an esp32 with lora as the gateway. Did you make it work?
I planning to buy, https://www.botnroll.com/en/esp/2979-esp32-wifi-bluetooth-lora-sx1278-433mhz-with-0-96-oled-display.html
@evb said in Please give me an advice for a simple sensor node:
But the node will continue to work till 1.8V in a safe operating area.
Yeah sure, but alkaline batteries are nearly depleted when they get to 1V, so barely worth the hassle.
@jvdk I agree with the point made by @evb , why would you want to wire connect the ultrasonic node rather than the usual radio connection ? You are adding levels of complexity and power demands for what reason ?
My ultrasonic water tank node (pro-mini+rfm69) is now 2 years on the same 2xAA batteries sending in levels every hour (RTC), the only problem encountered - condensation forming a drip on the face of the ultrasonic head during very low temperatures.
How ever powering from usb is not very stable. When sending multiple messages with delays my sketch sometimes stalls. Need to test with the suggested 6v power supply though. But most nodes don't need to send multiple messages quickly