My name is Mark Butterworth, and I’m a PhD student at Cardiff University. I am researching methods for remotely monitoring animal traps that are placed in the rainforests of Malaysia. The Malaysian forest is a dense evergreen forest that has extensive canopy cover. Cellular network do not cover the forest and due to thick canopy cover satellite communications are precluded. The traps are placed over a 20-mile radius, and transport between each trap is slow and difficult. Given the remoteness of each trap, an IoT mesh network is impractical as each node would need to be visited regularly for a battery change. I am intending to use low power, low bandwidth, HF signal using digital signal processing to facilitate a low data rate reliable communications medium. Just wondering if anybody has knowledge of anything similar or any other ideas that I should explore?
11 November 2020 8:39pm
My advice is always the same: use LoRaWAN, if there is no infraestructure there (towers, gateways) use just LoRa, it is a radio system under the 1Ghz band, it is great for low power consumption and given the fact that it is under the 1Ghz it won't have trouble with noise. With a good board from Microchip or Semtech you can reach up yo 15KM of signal from antenna to antenna. With a proper Mesh configuration you can cover a lot of terrain with cheap equipment. The RN2903 module from Microchip can be easly integrated to any hardware having TX/RX connections (serie). You can use an ASCII command set both to use the LoRaWAN stack or sending / receiving an arbitrary number of bytes (I use this scheme a lot), even the power used to transmite messages can be specified.
Cheers, I will be posting about this soon under the technology menu and / or the blog.