Soil moisture monitoring alarm system

In this wiki, we will show you how to unitize the Wio Terminal to link Grove - Wio-E5 and Grove - Soil Moisture Sensor which are in the kit, connecting them with Helium and Azure IoT Central platforms, to build a real-time backyard potting monitor and watering-reminder, for a glimpse of Internet of Things.

Upgradable to Industrial Sensors

With the SenseCAP S2110 controller and S2100 data logger, you can easily turn the Grove into a LoRaWAN® sensor. Seeed not only helps you with prototyping but also offers you the possibility to expand your project with the SenseCAP series of robust industrial sensors.

The IP66 housing, Bluetooth configuration, compatibility with the global LoRaWAN® network, built-in 19 Ah battery, and powerful support from APP make the SenseCAP S210x the best choice for industrial applications. The series includes sensors for soil moisture, air temperature and humidity, light intensity, CO2, EC, and an 8-in-1 weather station. Try the latest SenseCAP S210x for your next successful industrial project.

SenseCAP Industrial Sensor

S2100 Data Logger	S2101 Air Temp & Humidity	S2102 Light	S2103 Air Temp & Humidity & CO2

S2104 Soil Moisture & Temp	S2105 Soil Moisture & Temp & EC	S2110 LoRaWAN® Controller	S2120 8-in-1 Weather Station

Prerequisites

Before everything starts, we should meet the following prerequisites:

Materials Required


Wio Terminal	Grove - Wio-E5	Grove Soil Moisture Sensor

Software

- Arduino

We will upload programming to Wio Terminal through Arduino. If this is your first time using Arduino with Wio Terminal, we highly recommend you to refer to

Getting Started with Wio Terminal.

Others

Potting

In this kickstart demo, we are using a soil moisture sensor. Therefore a potting with deep enough soil will be the best.

Helium Registration for Connect

Helium is a global, distributed network of Hotspots that create public, long-range wireless coverage for LoRaWAN® enabled IoT devices.

It allows us to send a certain amount of data through LoRa® for free and we will connect it to the Wio Terminal. All the information we need to connect the Wio Terminal are all presented in the first page after account registration:

note

The device usually takes nearly 20 minutes to be really. It is recommanded to be added at the very beginning.

Azure IoT Registration for Notice

Azure IoT Central is a managed service hosted in the cloud that acts as a central message hub for communication between an IoT application and its attached devices.

It can help us to manage LoRa® data and do some actions for one week free at the beginning . We will integrate it with Helium to monitor data and set up a auto potting watering-reminder.

Soil Moisture Monitor Getting Started

In this quick demo we only require a simple LoRa® connection witn Grove - Soil Moisture Sensor, for the puporse of auto soil moisture monitor and alert.

Equipment Initiation

Step 1. Use Grove cable to link everything together where the Grove - Soil Moisture Sensor on the right of the Wio Terminal and Grove - Wio-E5 is on the left.

note

The position where the Grove - Wio-E5 is will make a difference to the uploaded code.

Step 2. Connect a PC and the Wio Terminal with a Type-C cable.

Connect Wio Terminal with Helium

Step 1. Open the Helium page on the PC and clilck "Devices" on the left column. Add a new device, then check the information below(example):

Step 2. Download the Arduino code below and open it with Arduino.

Step 3. Find the specific code line and fill the Helium connecting information we find into the code line where we should know we only change the letters and number.

Step 4. Select correct Borad and the Port. We can proceed to upload it by clicking the button in the upper left corner.

Step 5. Open the "Serial Monitor" on the upper right of Arduino, and we can see that the connection is done and the data has been sent.

Step 6. Move back to the Helium website and check the "Devices". At the bottom we can see that indeed some data have been received.

Because of the characteristic of LoRa® communication, the presentation of data is an array of numbers and letters that we may feel confused. Hence, we need to decode it for the true information.

Received Data Decoded in Helium

Step 1. Click the "Function" on the left colmon of the page, and add a custom function.

Step 2. Copy the code below and add it to the "CUSTOM SCRIPT", then save it.

function Decoder(bytes, port) {
  var decoded = {};
  if (port == 8) {
    decoded.soil = bytes[0]<<8 | bytes[1];
  }
  return decoded;
}

Step 3. Click "Flows" on the left and drag the "Devices" and "Functions" block into the palette. Link them together as below:

This helps us to translate our data to be readable.

Step 4(optional). Move back to "Function" page, and we can get the input hexadecimal data from the device. Select port as '8' and click the "RUN" button.

We now can read our data, but the process is a little complicated and not easy to use. How can we do to make the data to be presented continously?

Integrate Azure IoT Platform

We can integrate another platform Azure IoT to present and manage our data, even do some actions.

Step 1. Open the Helium page first, click "Integrations" on the left colmon of the page, and select "Azure IoT Central".

Step 2. Creat a new application on the Azure IoT Central . And then integrate the Azure IoT Central in the Helium by filling the required information below:

Step 3. Click the "Flows" on the left colmon of our page, drag the block of the Azure IoT Central and link it after the customized function, the order should be like:

Step 4. Move to the "Azure IoT Central" page and select the "Devices" on the left. We can see a device named after some ramdon numbers pop up.

Step 5. Select the device and check the "Raw data" information like the figure below shows. The information contains all the data form Helium, including the decoded data: