Application cases of wireless wake-up technology in irrigation systems

Overview

Agriculture is the economic lifeline of a country, and the development of the country is inseparable from the development of agriculture. As one of the major agricultural countries in my country, with the development of agriculture, the proportion of agricultural water used in agriculture is also increasing. Moreover, my country's current agricultural irrigation is mainly based on traditional artificial irrigation.

Traditional artificial irrigation has three main disadvantages:

Irrigation labor costs are high;

Artificial irrigation is not easy to control the amount of water, which can easily lead to insufficient or excessive irrigation;

Human activities will inevitably affect and damage the growth of crops.

In order to reduce labor costs, rationally utilize water resources, and improve the environmental quality of crop growth, it is necessary to improve traditional irrigation methods and apply science and technology to agricultural irrigation. This article briefly introduces the application principle of wireless wake-up of wireless serial port module in irrigation system.

Wireless wake-up

Wireless wake-up can also be understood as air wake-up (English name is Wake On Radio), which wakes up dormant node modules through wireless means.

Principle

The awakening party adds a long preamble before transmitting valid data; the awakened party periodically gets up to monitor wireless signals in the air. Once the correct preamble is captured, it enters the data receiving state. If nothing is found, it immediately enters sleep and waits for the next step. One-time wake-up listening. In order to ensure that the awakened party can be woken up normally every time, the time for the awakening party to transmit the preamble should be slightly greater than the time interval for the awakened party to wake up.

Apply wireless wake-up to agricultural irrigation systems. The entire system network is mainly composed of multiple nodes, gateways, host servers, and clients to achieve remote operation, grasp the current environmental status of crops, and rationally irrigate.

The node is mainly controlled by the main device

E31-T50S2

Various types of controllers

  Temperature Sensor

Soil moisture sensor

Liquid level sensor and other components

The gateway is mainly composed of a main control chip, a wireless serial port module (or similar high-power module), etc., and also plays the role of forwarding relay. The location of the gateway is approximately the same distance from each node location (each greenhouse, etc.). Of course, if you are in a relatively small network, you can also partially ban the gateway.

Principle of the plan

The host-side server is mainly composed of the main control device, wireless serial port module E31-T50S2 (or similar high-power module), computer, system software, etc.

The client uses various terminal devices to connect with the host server through the Internet.

The entire system network is as mentioned above. When the staff needs to know the status of the current environment of the crops, the host-side wireless serial port module is controlled to send an inquiry command signal to the air. When the gateway receives the correct query command signal, it sends a preamble code of appropriate length + query command signal to the air.

When the node wireless serial port module monitors the correct preamble, it enters the normal working state and receives the query command signal. Then the integrated response signal of temperature, soil moisture, liquid level and other information Stored in the main control device is transmitted to the air. After the transmission is completed, it switches to the periodic wake-up monitoring state.

When the gateway receives the correct response signal, it forwards the response signal to the host server. Staff can check the current status of the environment of crops through terminal software

When the staff confirms that irrigation is needed, the control host sends an operation command signal to the air.

When the gateway receives the correct operation command signal, it sends a preamble + operation command signal of appropriate length to the air. When the node wireless serial port module monitors the correct preamble, it enters the normal working state, receives the operation command signal, and transmits the signal through the serial port. After the transmission is completed, it enters the periodic wake-up state.

The main control device obtains the signal from the wireless serial port module through the serial port, analyzes and processes it, and controls various equipment to complete the irrigation operation, as shown in the following figure:

At present, the difficulty of this type of system is the low power consumption of the overall node. The wireless part of the node has achieved this purpose very well. With the continuous development of Internet of Things technology and new energy sources, this type of irrigation system will become more complete.