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+--- Thread: Retrieving Trend Data via periods.lp (/showthread.php?tid=6102)
Retrieving Trend Data via periods.lp - hocine - 04.09.2025
Hello everyone,
I'm currently building a custom energy monitoring application on Lm5. I’ve successfully accessed real-time values using
grp.getvalue() and identified the key trends (energy, power, consumption, etc.).
Now I’d like to implement period-based calculations (daily, weekly, monthly, yearly) using the periods.lp file to track
energy consumption over time.
My goal is to:
- Store the trend index at midnight (e.g. for photovoltaic energy)
- Compare it with the current index to calculate daily production
- Extend this logic to weekly, monthly, and yearly periods
Questions:
- What is the recommended way to store and retrieve trend indexes at specific timestamps (e.g. midnight) using
periods.lp ?
- Is there a built-in API or LogicMachine function to manage periods and deltas?
- Should I create a custom structure inside periods.lp , or is there a standard format I should follow?
- Has anyone implemented similar logic for periodic energy calculations and could share best practices?
RE: Retrieving Trend Data via periods.lp - Daniel - 04.09.2025
https://kb.logicmachine.net/libraries/trends/
RE: Retrieving Trend Data via periods.lp - hocine - 04.09.2025
(04.09.2025, 07:23)Daniel Wrote: https://kb.logicmachine.net/libraries/trends/
Error in ./www/apps/data/compteur4multi/libs/compteur4multi.lua at line 45: attempt to index global 'storage' (a nil value)
i always have this issue and i don't understand my mistake
i have this at line 45
Code:
"dependencies": {
"lua_modules": ["storage", "trend", "grp", "json"],
"system_version": ">=2.5.0"
},RE: Retrieving Trend Data via periods.lp - Daniel - 04.09.2025
What is your full script?
RE: Retrieving Trend Data via periods.lp - hocine - 04.09.2025
I have a file app.json
Code:
{
"id": "compteur4multi",
"title": "Compteur Multi-énergies",
"version": "1.0.0",
"author": "Schneider Electric",
"description": "Calculs d'autoconsommation et d'autonomie photovoltaïque",
"category": "energy",
"tags": ["energy", "photovoltaic", "consumption", "monitoring"],
"icon": "icon.svg",
"main": "index.lp",
"config": "config.lp",
"permissions": {
"storage": true,
"trends": true,
"groups": true,
"scripts": true
},
"files": [
"index.lp",
"config.lp",
"style.css",
"compteur4multi.js",
"icon.svg",
"api/compute.lp",
"api/config_save.lp",
"api/periods.lp",
"api/diag.lp",
"libs/compteur4multi.lua",
"libs/utils.lua"
],
"dependencies": {
"lua_modules": ["storage", "trend", "grp", "json"],
"system_version": ">=2.5.0"
},
"installation": {
"create_resident_script": true,
"script_name": "compteur4multi_resident"
}
}