Water Quality Data Reader

This C script read data from YSI EXO2 multiparameter sonde with EXO Modbus Signal Output Adapter (SOA). The data will be locally logged in CSV files and send to influxdb through http. Make sure the influxdb is running in the network and accessible. Set up rasperyPI to tranfer data with SOA using modbus.

config.txt is a csv file contains the modbus registers in the SOA with there corresponding parameter names, see https://www.ysi.com/File%20Library/Documents/Guides/599825_Modbus-Quickstart-Guide.pdf for more details on the SOA.

Pre-request

The sensor and SOA communicate with the raspberry PI using Modbus protocal, so you need libmodbus 3.1.4 to compile the script.

install git first if you don't have it yet sudo apt-get install git

git clone the libmodbus5 git clone git://github.com/stephane/libmodbus

install libtool before install libmodbus sudo apt-get install libtool

install libmodbus after that run ./autogen.sh and run ./configure && make install

run ldconfig as root if required

Refer to https://github.com/stephane/libmodbus

the script also requires libcurl to send the data to influxDB through HTTP install libcurl-dev if needed.

sudo apt-get install libcurl-dev

Compile

compile the C script using gcc and pkg-config. gcc waterquality.c -o waterquality `pkg-config --libs --cflags libmodbus`

Run

You can directly run the script or use nohup or tmux to run it so it will not be terminated if you log off from SSH. ./waterquality or nohup ./waterquality & You may need root to run

By Yiheng Chen University of Bristol 12/07/2018