---
title: "W5500 + SHT30 + IOT platform"
url: "https://maker.wiznet.io/mark/projects/w5500-sht30-iot-platform/"
markdown_url: "https://maker.wiznet.io/mark/projects/w5500-sht30-iot-platform/md"
type: "WCC: WIZnet Created Content"
author: "Mark Yu"
editor: "WIZnet"
editor_url: "https://maker.wiznet.io/"
original_author: "Mark Yu"
published: "2023-04-21"
language: "en"
hardware: ["WIZnet W5100S-EVB-Pico"]
likes: 7
views: 167
comments: 0
source: "WIZnet Makers (https://maker.wiznet.io/)"
---

# W5500 + SHT30 + IOT platform

> W5500 + SHT30 + IOT platform

Original author: Mark Yu

## Components

- **WIZnet W5100S-EVB-Pico** x 1 ([docs](https://docs.wiznet.io/Product/Chip/Ethernet/W5100S/w5100s-evb-pico))

## Documents and links

- [W5100S + sht30 + cpy + aio](https://github.com/markyu/w5100s---sht30---cpy) (code)

## Article

## Project

A Project used W5100S-EVB-PICO with SHT30 to develop a basic IOT application to connect with different kinds of IOT platform to allow different kind of people could use this application.

My previous idea is planning to use WizFi360-EVB-PICO. However, using Ethernet Solution could have a faster communication speed than WiFi solution.

The structure Should be showed as follow

![](https://maker.wiznet.io/upload/ckeditor5/918994404%5F1684512278%2Epng)

In this concept stage, I planning to develop this application using circuitpython.

Circuitpython has a lot of libraries that allows me to plug in different kinds of module to works right away.

By using WIZnet's W5100S-EVB-PICO circuitpython library, it will be easy for me to communicate with different IOT platforms.

For my plan, this application will used to communicate with adafruit io and Blynk.

## **Coding:**

Reference coding provided by SHT30 using Chatgpt - Get inspired from these codes

```python
import time
import board
import busio
import adafruit_sht31d

# Create I2C bus
i2c = busio.I2C(board.SCL, board.SDA)

# Create SHT30 sensor object
sht = adafruit_sht31d.SHT31D(i2c)

while True:
    # Read temperature and humidity
    temperature = sht.temperature
    humidity = sht.relative_humidity

    # Print values
    print("Temperature: {:.1f} C".format(temperature))
    print("Humidity: {:.1f} %".format(humidity))

    # Wait a second before taking another reading
    time.sleep(1)
```

Based on these information, I had modified codes and combine with Ron's adafruitio codes using W5100S-EVB-PICO. The following are part of my codes:

```python
# Connect to Adafruit IO
print("Connecting to Adafruit IO...")
io.connect()
# # Subscribe to all messages on the led feed
io.subscribe("led")
print("Connected to Adafruit !!")
counter = 0
while True:
   io.loop()
   try:
       if counter >= 5:
           #send a new message
           temp_reading = sensor.temperature
           print("Publishing value {0} to feed: {1}".format(temp_reading, temp_feed))
           io.publish(temp_feed, temp_reading)
           humid_reading = sensor.relative_humidity
           print("Publishing value {0} to feed: {1}".format(humid_reading, humid_feed))
           io.publish(humid_feed, humid_reading)
           
           counter = 0
       
       else:
           time.sleep(1)
           counter = counter + 1
           
   except RuntimeError as error:
       # Errors happen fairly often, DHT's are hard to read, just keep going
       print(error.args[0])
       time.sleep(2.0)
       continue
   except Exception as error:
       dhtDevice.exit()
       raise error
```

For details, please refer to my github codes.

## Results

The following are the testing result from adafruitio and circuitpython result.

![](https://maker.wiznet.io/upload/ckeditor5/918994404%5F1684512663%2Epng)

## YouTube

[Embedded media](https://www.youtube.com/embed/jlwfnj0fPbE)

---

Source: https://maker.wiznet.io/mark/projects/w5500-sht30-iot-platform/