IAQ Wired Sensor. Part of smart_household

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README.md

Indoor Air Quality sensor IAQ01

This repository contains all CAD files needed for making a Veles IAQ01 wired sensor, part of a family of Veles Smart Household sensors.

Basic properties

Measured values

Carbon dioxide
Temperature
Relative humidity
Volatile Organic Compounds (VOC)
PM (particulate matter) [optional extension]

Connectivity

RS-485 with Modbus

Power requirements

Input voltage: 5 - 30 V DC

Project files

Hardware
- Schematic and PCB (KiCAD project) in PCB/iaq_wired_sensor.kicad_pro
- PCB step model in PCB/3D_MODEL/iaq_wired_sensor.step
- Gerbers for PCB manufacturing in PCB/Project_Outputs/GERBERS
- Schematic exported as PDF in PCB/Project_Outputs/Schematic/iaq_wired_sensor.pdf
- Interactive HTML BOM file in PCB/Project_Outputs/iBOM/iaq_wired_sensor_rev1_ibom.html
Firmware
- This is a STM32Cube IDE project
- Uses a number of git submodules - clone this repo with --recursive or use git submodule update --init to get them
Enclosure
- FreeCAD project in Enclosure/IAQ_Sensor_Enclosure.FCStd
- STL files in Enclosure/STLs
  - Printing tested on Prusa Mk2S
Documentation
- Datasheet in Documentation/Datasheet/IAQ_Wired_Sensor_Datasheet.pdf
- Product flyer in Documentation/Product_Flyer/wired_iaw_sensor_flyer_rev1.pdf

Images

Veles Smart Household

This sensor is part of Veles Smart Household. Goal of this project is to create open hardware and software platform for measuring various quantities, not only related to indoor air quality:

temperature
humidity
atmospheric pressure
carbon dioxide (CO2)
carbon monoxide (CO)
volatile organic compounds (VOC)
particulate matter (PM - dust particles)
light intensity
soil moisture

... and some more!

Sensors are connected either via RS-485 Modbus or wirelessly to central unit. Wireless sensors are currently in development. Central unit may be any anything that can read from the bus: any computer with RS-485 to USB converter (e.g. Raspberry Pi) or an actual PLC. Readout of the sensor is possible via Modbus: either using your own favourite application or using your Python package.

We want this to be community effort! Come help us make something great!

Other Smart Household repositories

RHT wired sensor
Python package for sensor readout and visualization (work in progress)
- Can be installed using pip install veles

Modbus register cheatsheet

Input Registers

Value	Register
CO2	30010
SHT4x	30011
RH SHT4x	30012
T SCD4x	30013
RH SCD4x	30014
T SHT4x SIGNED	30015
T SCD4x SIGNED	30016

Holding Registers

Value	Register
LED ON	40001
LED BRIGHTNESS	40002
LED SMOOTH	40003
CO2 ALERT LIMIT1	40004
CO2 ALERT LIMIT2	40005
SCD4x T OFFSET	40006
MODBUS ADDR	40007

Device Information Registers

Value	Register
VENDOR NAME	30010
PRODUCT CODE	30011
REVISION	30012
PRODUCT NAME	30013
SERIAL NUMBER	30014