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"Innovative Bluetooth sensor network delivers improved crop status visibility to growers"

For Agritech company WayBeyond, the solution was simple. Yet they had to question why no other companies had approached the problem in this way before.

Their target market: commercial growers, require frequent, and detailed climate data to get the best from their crops. In a greenhouse environment, keeping the fine balance of temperature, humidity, and other factors is the key to consistently producing good quality, high yield harvests. This data is also vital in helping farmers mitigate pest and disease outbreaks that can damage crops.

Three problems that growers need solving
The first problem WayBeyond sought to solve was a matter of coverage: agricultural farms have several vast greenhouses – each one roughly the size of a football pitch – and yet often these farms have only one climate sensor per greenhouse. While this sensor is sophisticated and delivers accurate temperature and humidity readings, its singular instance means it is restricted in delivering an accurate picture of climate variations that occur across such a large growing area.

The second problem was one of location: these single sensors are often installed above a crop in a fixed position. But disease issues that affect fresh produce usually begin inside the canopy of a crop, not above it – thus fixed-position sensors are limited in their ability to reveal potential disease issues, often until it’s too late. 

The third problem WayBeyond describes as “data-density” i.e. the concentration of readings useful to the grower from one location. Typically only measurements of temperature and humidity are recorded with sensors. These provide an adequate but far from comprehensive picture of the growing environment.

Small, portable and networkable sensor units
WayBeyond’s solution was to develop a wireless sensor network. The network comprises of multiple units named Folium. Folium solves the coverage issue by being installed in clusters of four to six across the greenhouse area. This provides a more comprehensive view of climate by collecting readings from multiple locations.

As well as taking standard environmental measurements of temperature and humidity, the Folium unit additionally measures carbon dioxide levels, PAR and RAD (two types of light important to growers) and barometric pressure. Additionally, the unit supports two other sensors useful to growers: plant temperature sensors and soil/substrate moisture sensors which plug into the base. With this capability, Folium delivers greater data density to provide farmers with a fuller picture of conditions inside their greenhouse.

A farm under persistent threat of crop loss
One example of Folium’s effectiveness is how it improved the fortunes of a herb farm in New Zealand. The Herb Patch is a commercial grower of 20 types of herbs in greenhouses covering 8 acres (3.2 hectares). The farm had suffered repeated outbreaks of the fungal disease Botrytis in their crops and the loss was affecting their bottom-line.


Botrytis is a fungal disease that destroys crops at a rapid rate leading to loss of revenue for commercial growers.

Despite experiencing outbreaks in previous years, pinpointing the cause was proving difficult. Without being able to identify the contributing factors leading to the outbreak, finding a solution was impossible. 

Folium was deployed over a three month period to monitor the conditions and to gather data to provide insights so a response could be formulated.


Folium multisensor units sit amongst the basil crop monitoring climate data during the attempt to identify the cause of the disease outbreak 

Data identifies the issue and course of action
Analysis showed that the greenhouse was experiencing prolonged periods of high humidity coupled with lower temperatures. This was creating optimal conditions for the disease to take hold. Moreover, the data was able to show these occurrences a full three weeks before any visual signs of the disease were reported by the farm team. The farm manager revealed that 40% of the crop in one greenhouse was infected and had to be removed to prevent further spread.

The financial impact of 40% crop loss in a single greenhouse reverberates deeply throughout a farming operation. Loss of revenue, cost of new seedlings, cost of labor to remove infected plants and the cost of labor to clean, disinfect and replace with new seedlings in this instance added up to USD$6,820. Botrytis was also evident in 2 other greenhouses. However, the true cost is not only measured in dollars as loss of customer confidence due to lack of supply may affect business reputation and relationships in the longer term.

By harnessing the Folium Bluetooth wireless sensor network, farmers receive a richer picture of the status of their crops. Folium monitors environmental data (both real-time and historic) 24/7 and so allows early detection of conditions that may lead to pest or disease outbreaks.

Engineering the solution with Bluetooth technology
WayBeyond were one of the first to use Bluetooth technology in the agricultural sector and were able to harness the power of Bluetooth 5 to connect the units over distance. While Bluetooth is typically known for short range connectivity (e.g. to connect a mouse to a keyboard) WayBeyond were able to engineer a solution that could connect at a distance of 1.4km with direct line of sight.

Folium is also battery powered. Growers usually have to replace batteries in sensors every 3-4 months but WayBeyond wanted their customers to avoid this inconvenience. Folium sleeps for almost a minute, then wakes, collects the latest sensor readings, transmits them to the gateway then returns to sleep. By engineering Folium using Bluetooth Low Energy Coded PHY, WayBeyond were able to optimise Folium for power usage and extend battery life to almost 12 months. 

To do this Waybeyond conducted extensive testing with Bluetooth to find a satisfactory balance between battery life and range. Building materials like concrete and steel naturally impact range, but WayBeyond discovered crop type and thickness also played a part. Test setups were created for growing environments varying from indoor greenhouse operations with dense vegetation to outdoor orchards with large open spaces.

Reducing errors and power consumption
During experimentation it became clear that the error correction abilities of Bluetooth Low Energy Long Range (CODED_PHY) decreased error rates significantly. WayBeyond managed to keep power consumption during sleep to an absolute minimum (<18uA) and so were able to take advantage of the more power hungry TX Power of 4dBm.

Folium does not send a lot of data, which makes CODED_PHY an even more suitable solution, but as it still makes a significant number of measurements in a short time, the maximum packet size of a standard Bluetooth advertising packet would not suffice. One solution was to send 2x advertising packages in succession but this added extra overhead. So WayBeyond took advantage of the extended advertisement feature of Bluetooth LE. Instead of sending 2x packets (which incur double overhead and thus consume more power), Folium transmits all information in a single, slightly larger packet.

For more information:
Way Beyond 
www.waybeyond.io 

 


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