embeddist: An Simple IoT example - connected CO2 Sensor with WIZ550S2E

This IoT example shows how to connect CO2 sensor to your ethernet network, and how to send sensing data by using Serial-to-Ethernet gateway module as UDP client. Using S-to-E gatewat module, your device does not need any additional codes and hardware requried.

In this example, WIZ550S2E-232 as a S-to-E module and S-300 as a CO2 sonsor module are used.

WIZ550S2E-232: This module is a gateway module that converts RS-232 protocol into TCP/IP protocol and enables remote gauging, remote management of the device through the network based on the Ethernet and the TCP/IP by connecting to existing equipment with RS-232 serial interface.

S-300: This SO2 (Carbon Dioxide) sensor module designed by ELT (http://eltsensor.co.kr/) and has available output with TTL-UART for sampling interval of about 3 seconds .

Block Diagram and Network Configurations

This figure is shown the block diagram and network configurations for this project.
- IoT Sensor Node is made up as follows
  - S-to-E : WIZ550S2E-232
  - CO2 Sonsor : S-300
  - UDP Client embedded on S-to-E
- Monitoring Server is composed as follows
  - UDP server : Hercules (TCP/IP utils) on PC

Serial-to-Ethernet Module : WIZ550S2E-232
- Gateway module that converts RS-232 protocol into TCP/IP protocol
- Serial to Ethernet Module based on W5500 & Cortex-M0
- RJ-45 mounted, Pin-header type module
- Serial signals : TXD, RXD, RTS, CTS, GND
- Support the configuration method of AT command & Configuration tool program
- Configuration tool program operates on Windows, Linux & MAC OS
- Support the interface board for RS-232 and RS422/485
- 10/100Mbps Ethernet & Max.230kbps serial speed
- Support WIZ VSP (Virtual Serial Port) program
- Dimension (mm) : 55(L) x 30 (W) x 23.49 (H)

Co2 Sensor: ELT Sensor : S-300
- Non-Dispersive Infrared (NDIR) technology used to measure CO₂levels.
- Pre-calibrated
- Available outputs : TTL-UART, I2C, ALARM, PWM/Analog Voltage.
- Gold-plated sensor provides long-term calibration stability.
- Installed re-calibration function
- Operate as ACDL mode (Automatic Calibration in Dimming Light mode).
- Manual Re-Calibration function is executable.
- ROHS Directive- 2011/65/EU,[EN50581 : 2012,IEC 62321-3-1 : 2013]
- Size : 33mmx33mmx13.1mm
- Weight : 10 grams

Hardware connections

Three lines as below the may be connected for Sensor node.
The TXD in S-300 and RXD in WIZ550S2E should be connected together.

WIZ550S2E	Direction	S-300 JIG
RXD	<---	TXD
VCC(baseboard)	<---	VCC (5V)
GND		GND

WIZ550S2E

S-300 JIG

Software

WIZ550S2E Side: Sensor Node
- wiznet_configuration_tool is dedicated utility to configure the WIZ550S2E.
- WIZ550 Configruation Tool Download : wiznet_configuration_tool_ver1.02.zip
- WIZ550 Configruation Tool User Guide : WIZ550 Configruation Tool Guides

PC tools: Monitoring Server
- Herdules
  
  > Hercules SETUP utility is useful serial port terminal (RS-485 or RS-232 terminal) , UDP/IP terminal and TCP/IP Client Server terminal. It was created for HW group internal use only, but today it's includes many functions in one utility and it's Freeware! With our original devices (Serial/Ethernet Converter, RS-232/Ethernet Buffer or I/O Controller) it can be used for the UDP Config.
- Hercules download : version3.2.8
- Hercules user guide : User Guide