Transmitter Prototype

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A previous channel principle of the Q-Strip was based on an Arduino, Seeeduino LoRaWAN development board and then I tested a feather board, both boards are stable but in my opinion too big. At the moment I am working on a LoPy module that is even smaller and well portable.
Every 2 minutes the LoraWan transmitter sends a signal with the measured values ​​of the connected moisture sensor. This signal goes to the LoRaWAN Gateway and then is collected in a database.
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Q-Strip Disposable Sensor Prototype

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The prototype “disposable sensor” is based on a liquid resistance measurement with paper as an insulator. The paper absorbs and measures the value of the conduction between the 2 electrodes as soon as it comes into contact with the liquid. During the first tests it turned out that the paper should not dissolve in the liquids. Using thicker paper (kitchen roll) gave the desired result. The paper is also reinforced by the 2 very thin electrodes that run along the entire length (80 cm to 180 cm).
At the moment I made strips of carbon strands with a thickness of 100μm, reinforced with absorbent paper from Nalys (this came out best from the tests when making QStrips) and an adhesive strip at the beginning to be able to attach the strip to the transmitter. This keeps the “system” hygienic and “handy” in use.
 
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The LoRaWAN Gateway

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The LoraWan Gateway module is set with a bridge on a Raspberry pi 3 and connected with SMA connector to the outdoor antenna. Raspberry is running Jessie image on this Raspberry. The packetforwarder scriptings from TheThingsNetwork are used to send all LoRa data from the gateway to “the cloud”. From here all data can be retrieved to show in reports or live on. So send signals back to the sensor!
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Mobile IOS Development

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Een mobiele applicatie die ik “MySensors” noem heb ik ontwikkeld in Delphi Tokyo 10.2. De software is gecompileerd met de platform assistant op een mac mini en kan via Apple’s Testflight getest worden op alle Apple devices. De applicatie maakt REST calls naar de API van thethingsnetwork.org, waar alle data tevens voor 7 dagen bewaard blijft. Ook kan ik mogelijk switchen naar de geschiedenis van data die ik lokaal heb opgeslagen via de Desktop applicatie.