First LoRa node in the real world


Batterie + Solar + 3D Gehäuse + Arduino Pro Mini + RFM95W + DHT22

Finally a real application

Hello friends,

apologize for the rare posts, I’ve been employed in a makerspace for a few weeks now and I’m not coming to write something. Great fun, but documenting here in the blog…

Advantage: I also work there on LoRa and TTN, so there will still many projects published that would have never been possible without this job.

So, as mentioned in the headline: The first node is running 🙂 Sending every

Application: At the Makerspace is a lantern. We do not have temperature sensors outside. A gateway is on the roof! Clearly: LoRa and DHT22, done!








The board from the post  “My first own TTN node with self designed PCB” certainly known to you, otherwise read the article;)

The structure is thus very simple. The board has everything we need, the DHT22 temperature sensor is simply soldered to the Arduino and ready.

The solar cell is very small, the battery also only in AA (14500) format. No problem with sunshine. We will see how the combination works in winter! I’m curious! However, the battery should last long enough so that winter should not be a problem.

Data processing

The Things Network -> Payload -> NodeRed -> Thingspeak / own Database / …


Technical specifications

  • Arduino Pro Mini 3.3V (LowPower mods)
  • RFM95W
  • 0.15W 5V solar cell
  • 900mAh 3.7V LiPo
  • Running time about 2 years without sun?
  • 5 days sun to fully charge


Runtime Bill

As we learned in the LowPower article here we can expect self-discharge, now and then, deep sleep to consume about 0.04A.

At 900mAh battery and 0.04A consumption we come to 900 days. Therefore, winter should not be a problem! Top!



Affiliate links:

If you order through any of the following AliExpress links, I get about 8% commission 😉

Soshine 4pc 3.7V ICR 14500 900mAh Li-ion
Mini 0.15W 5V Solar Panel
DHT22 single-bus digital temperature and humidity sensor

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