tdpeuter/2025IoT-project-ThingsBoard
tdpeuter/2025IoT-project-ThingsBoard
Archived
1
Fork 0
Code Issues Pull requests Releases Activity Actions

answer question 3

Browse source
This commit is contained in:
Mathis De Witte 2025-12-06 21:34:27 +01:00
parent e5fb720c9c
commit 484caab2d1
1 changed files with 12 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

13
answers.md
View file

@ -5,13 +5,24 @@ Thingsboard? How this could be done?*
A: Yes this is possible, there are generally two ways of doing this:
1. You could add a script node to the rule chain which receives the (voltage) sensor data and transforms this into the temperature through a certain function.
2. There is now also a new feature in Thingsboard called "Calculated fields". This way is generally more elegant as it doesn't require you changing the rule chain. The calculated fields can be configured at both the device level and the device profile level.
2. There is now also a new feature in Thingsboard called "Calculated fields". This way is generally more elegant as it doesn't require you changing the rule chain. The calculated fields can be configured at both the device level and the device profile level. We can either use a "Simple calculated field" for simple arithmetic functions, or we can use a "Script calculated field", which allows us more control over the computation on the data. These scrips are written in a language called "TBEL".
sources:
- https://thingsboard.io/docs/user-guide/rule-engine-2-0/overview/
- https://thingsboard.io/docs/user-guide/rule-engine-2-0/tutorials/transform-incoming-telemetry/
- https://thingsboard.io/docs/user-guide/calculated-fields/
## Question 3
Q: *We have a node monitoring pumps vibration on a water station. We need to predict when
vibration will reach critical levels so we can schedule preventive maintenance for the pump
and avoid unplanned downtime. Briefly describe how this could be accomplished with
ThingsBoard.*
A: This too can be done by calculated fields. For this field we would probably want to use a "Script calculated field" as it allows us to access historical data (through the variable ctx). The function will need to do some analysis on thi historical data and based on that estimate when a device would need preventive maintenance. The output of this script should be an Attribute, as we want a single answer for when to plan the maintenance.
source:
- https://thingsboard.io/docs/user-guide/calculated-fields/
## Question 4
Q: *Alarms are an important part of telemetry monitoring. Describe how they work in
ThingsBoard and what options are available to send notifications when an alarm is triggered.*