Hi, I need some help in building a salt water station that will measure temperature, electrical conductivity and dissolved oxygen. These three sensors will be hooked up on a tentacle t3 and on a raspberry pi 4b. I have scripts to read the data but I want somehow to have real time access to these data through a pc or a smartphone. Any ideas? Im newbie in Iot

 

Will the RPi be on the same network as the pc/phone?

 

No, different network

 

OK, will it be on a network with Internet access?

 

A couple more questions:

How comfortable are you with programming? With systems administration?

 

Its my first project and I have no experience. Of course i can learn and try.

 

OK, I am going to make a suggestion. Consider using four things:

Node Red
MQTT
InfluxDB
Grafana

Node Red is a graphical programming environment to connect all these things together. MQTT is a way to report the data to Node Red, it's a message queue. InfluxDB is a time series database for storing the data and Grafana is a full featured graphical tool for presenting the data from InfluxDB via a web browser.

I also suggest this: https://tech.scargill.net/the-script/ which is a relatively easy way to get it all on the RPi. It automates all the installations. There are many resources for all these things online.

 

I'll try it. Thank you for your time

 

I'll try it. Thank you for your time

I think you will like it, it's very flexible. A hint is you will need the mosquitto-pub CLI program to integrate your scripts with MQTT, but it's really easy.

 

I see that i can do everything i want with node red but i cannot find flows for my sensors...there are flows for db18b20 and dht11 for example but for atlas scientific pt1000 nothing.

 

I see that i can do everything i want with node red but i cannot find flows for my sensors...there are flows for db18b20 and dht11 for example but for atlas scientific pt1000 nothing.

According to its datasheet, the board included with the probe speaks UART & I2C. You need to use the DIO pins on the RPi to connect it, and some the serial nodes in Node Red to talk to it via the UART.

 

The sensor is connected on a tentacle t3 and it can read only i2c

 

The sensor is connected on a tentacle t3 and it can read only i2c

With the documentation of the sensor HAT there is a small python program that reads the device. You can use the exec function node to get the output of that program and use it.

 

Sorry for being tedious but you are the only person that answers my questions for this project. I did what you told me, i used the exec function but when running the atlas sample script i get information of the commands like poll etc...so how can i get the data? When you run the script you dont get the data immidietly bit you have to command.

 

Sorry for being tedious but you are the only person that answers my questions for this project. I did what you told me, i used the exec function but when running the atlas sample script i get information of the commands like poll etc...so how can i get the data? When you run the script you dont get the data immidietly bit you have toView attachment 233380 command.

Everything you need is in that program. You just need to look at the source and extract the parts that you need. You may also be able to pass it command line parameters that will provide only what you want.