Solar Lora
The stealth of outdoor Meshtastic nodes: camouflage shell, low power consumption optimization, and ventilation design
he original author , outbackhiker , disassembled and reassembled an abandoned trail camera into a covert Meshtastic node. This isn't just a hardware modification; it's a clever application of the device's workings.
The inspiration for the project: the dual challenge of maintaining a low profile and functionality
The most striking feature of this Meshtastic node is its camouflage housing. While traditional node designs typically expose the hardware, the author took a discarded surveillance camera housing and transformed it into a discreet yet fully functional node. This design not only ensures the device can operate discreetly in outdoor environments but also enhances its concealment, preventing the risk of accidental damage.
In order to make the node low-profile while still having powerful performance, the original author carefully selected the following key components.
· Gizont Antennas: To ensure stable signal transmission even when the nodes are placed in secluded locations, we used Gizont antennas. Coincidentally, members of the MeshCN community have also found this brand of antennas to be quite effective.
· Trail camera housing: As the core part of maintaining a low profile, the camera housing is dust-proof and waterproof, and can also use the camouflage of the body to hide the electronic components inside the device, achieving a perfect balance between beauty and practicality.
· Li-ion polymer battery: A reliable Li-ion battery provides sufficient power to keep the device running continuously. According to the original author, while this battery provides power for a while, the Heltec module's battery life remains problematic, lasting only about two days at most. He therefore plans to switch to the more efficient RAK module.
For this project, Outbackhiker also incorporated an air breather vent. This seemingly insignificant accessory is actually crucial to the long-term stability of the device. In a closed enclosure, long-term operation can cause moisture to condense due to temperature fluctuations or increased humidity, affecting the proper functioning of electronic components. The air breather vent effectively prevents this, helping to maintain internal dryness and protecting the battery and circuit boards from moisture corrosion.
The ventilation valve is based on the principle of gas flow, ensuring that outside air does not allow moisture to accumulate when entering the device while maintaining waterproofness. This keeps the device in a healthy working environment and extends its service life.
Battery life challenge
Outbackhiker encountered during this project was the battery life of the Heltec LoRa32 v3 module. Because it's based on the power-hungry ESP32 chip, its high energy consumption meant the battery only lasted about two days. This was one of the reasons he decided to replace the Heltec module with a RAK module.
The RAK module is similar to the Heltec T114 module, both utilizing the low-power nRF52 MCU. This MCU performs exceptionally well in low-power modes, significantly extending battery life. Low power consumption is crucial, especially when powered by solar energy, ensuring stable operation even when the device is not charging.
Therefore, the original author intends to replace the Heltec module with the RAK module in order to fully utilize the low power consumption characteristics and improve the battery life of the device.
Our MeshCN community has also recognized the advantages of the nRF52 MCU as a solar node. Consequently, the Heltec T114 has become very popular within our Chinese Meshtastic community. This isn't due to any issues with RAK; it's simply because the Heltec T114 offers a better price-performance ratio, and our community members have extensive experience with it.
Conclusion: From creativity to realization, the infinite possibilities of DIY
This project, by the original author, is more than just a simple appliance modification; it's a DIY adventure brimming with creativity and challenges. Through careful component selection and arrangement, he not only maintained functionality but also considered low-profile design and long-term stability. The attention to detail in the design, such as the installation of the ventilation valve, demonstrates the technical depth and practical wisdom of DIY projects.
If you're interested in building your own Meshtastic node, take inspiration from this example. From case design to battery life optimization, the possibilities are endless. Join our community (there's also a WeChat group!) and share your ideas and experiences!
If you’re interested in more details and discussion about this project, you can visit the original Reddit thread for more information. It’s a discussion full of creative and technical challenges and well worth a read.
Author: Hays Chan | Community blogger
Translator:Joe Tan | KEEPTEEN | meshtastic node repeater
Website: https//www.keepteen.com
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