---
title: "Automation of Agriculture With IRIV IO Controller"
url: "https://maker.wiznet.io/irina/projects/automation-of-agriculture-with-iriv-io-controller/"
markdown_url: "https://maker.wiznet.io/irina/projects/automation-of-agriculture-with-iriv-io-controller/md"
type: "UCC: User Created Content"
author: "Hussien Jawhar Sathik"
author_url: "https://my.cytron.io/tutorial/sample-application-automation-of-agriculture-with-iriv-io-controller"
editor: "WIZnet"
editor_url: "https://maker.wiznet.io/"
original_author: "Hussien Jawhar Sathik"
original_url: "https://my.cytron.io/tutorial/sample-application-automation-of-agriculture-with-iriv-io-controller"
published: "2025-08-27"
language: "en"
likes: 0
views: 2347
comments: 0
source: "WIZnet Makers (https://maker.wiznet.io/)"
---

# Automation of Agriculture With IRIV IO Controller

> Automate irrigation with IRIV IO Controller: read RS-485 soil & ambient sensors, drive a 24 V relay by moisture, and push data to Blynk over Ethernet.

Original author: Hussien Jawhar Sathik (source: https://my.cytron.io/tutorial/sample-application-automation-of-agriculture-with-iriv-io-controller)

## Article

This project uses an **IRIV IO Controller** to automate irrigation: it reads **soil** and **ambient** conditions from **RS-485 (Modbus RTU)** sensors and drives a **24 V DC relay** (water pump) based on moisture thresholds. Data is visualized in a **Blynk** dashboard via **Ethernet (WIZnet W5x00, CircuitPython)**. The tutorial lists the exact sensors, wiring, Modbus register map, and a working example.

---

## 🔧 Project Overview

**Project Name:** Sample Application: Automation of Agriculture with IRIV IO Controller
**Author (Tutorial):** Hussien Jawhar Sathik (Cytron)
**Platform:** IRIV IO Controller (CircuitPython)
**Networking:** WIZnet W5x00 (`adafruit_wiznet5k`) over Ethernet
**Field Bus:** RS-485 (Modbus RTU)
**Actuator:** 24 V DC Industrial Relay on **DO0** (water pump)
**Cloud/App:** Blynk (virtual pins for all measurements + pump status)

---

## ⚡ How the Project Works

### 1) Hardware Setup

- **IRIV IO Controller**

- **Industrial RS-485 4-in-1 Soil Sensor** (pH, Moisture, Temperature, EC)

- **Industrial RS-485 Temperature & Humidity Sensor**

- **24 V DC Industrial Relay** (driven from **DO0**)

- **Ethernet** (DHCP recommended)

![](https://maker.wiznet.io/upload/ckeditor5/860796700%5F1756377933%2Epng)

### 2) Protocols & Control

- **Modbus RTU register map (example in tutorial):**

- Ambient: **humidity=reg 0**, **temperature=reg 1**

- Soil: **temperature=reg 6**, **moisture=reg 7**, **EC=reg 8**
  Values are scaled (e.g., ÷10 or ÷100).

- **Decision logic:** If **SoilMoisture < 50%**, pump **OFF**; otherwise **ON** (adjustable). Relay status is also sent to Blynk.

- **Networking:** W5x00 initialized via SPI, HTTP session created, and Blynk virtual pins (**V0–V5**) updated.

### 3) Development Process

**Wire sensors** (both on RS-485) and relay to DO0; verify connections before power-up.

**Program IRIV** in CircuitPython; confirm each sensor’s starting register addresses (ambient vs. soil).

**Create Blynk dashboard** with datastreams: V0=Ambient T, V1=Ambient RH, V2=Soil T, V3=Soil Moisture, V4=EC, V5=Pump status.

![](https://maker.wiznet.io/upload/ckeditor5/860796700%5F1756377996%2Epng)

---

## 💡 Key Features & Benefits

### Features

**End-to-end automation:** Sensing (Modbus RTU) → decision → actuation (relay).

**Clear register map & code:** Ready-to-run example with Blynk V-pins.

**Robust wired uplink:** WIZnet W5x00 + HTTP updates.

### Applications

**Irrigation control, greenhouses, smart farms:** Moisture-driven pump control with live telemetry.

---

### Code Highlights (Essentials)

The tutorial shows a complete CircuitPython example using `**adafruit_wiznet5k**`, `**adafruit_requests**`, and `**uModbus**`, updating Blynk **V0–V5**. Replace the token and adjust thresholds/registers as needed.

```plaintext
# Blynk + Modbus RTU + W5x00 (essentials)
BLYNK_TOKEN = "YOUR_BLYNK_TOKEN"                 # replace
UPDATE_URL  = "http://blynk.cloud/external/api/update"

# Read Modbus registers (addr 1): ambient RH=0, T=1; soil T=6, moisture=7, EC=8
AmbT  = host.read_holding_registers(1, 1, 1)[0] / 10.0
AmbRH = host.read_holding_registers(1, 0, 1)[0] / 10.0
SoilT = host.read_holding_registers(1, 6, 1)[0] / 100.0
SoilM = host.read_holding_registers(1, 7, 1)[0] / 100.0
EC    = host.read_holding_registers(1, 8, 1)[0]

# Moisture rule → drive DO0 (pump)
relay_on = SoilM >= 50.0
switch.value = relay_on
status = "PUMP ON" if relay_on else "PUMP OFF"

# Push to Blynk (V0..V5)
for v, val in zip(("V0","V1","V2","V3","V4","V5"),
                  (AmbT, AmbRH, SoilT, SoilM, EC, status)):
    requests.get(f"{UPDATE_URL}?token={BLYNK_TOKEN}&{v}={val}")
```

See the tutorial for the full script, including W5x00 init, session creation, and the **V-pin table**.

---

### Troubleshooting Tips

**Wrong values?** Confirm each sensor’s **starting register** and scaling (÷10/÷100).

**Pump never toggles?** Check DO0 wiring, relay coil voltage (24 V), and threshold logic.

**No dashboard updates?** Verify Blynk token, V-pin names (V0–V5), and network reachability.

---

Source: https://maker.wiznet.io/irina/projects/automation-of-agriculture-with-iriv-io-controller/