Indoor Air Quality sensor (wired version)

This repository contains all CAD files needed for making a Veles IAQ01 wired sensor:

• Hardware: KiCAD project (schematic, PCB and exported Gerbers)
• Firmware: STM32 IDE project
• Enclosure: FreeCAD project

This sensor which is part of wider family of Veles Smart Household sensors.

Basic properties

Measured values

• Carbon dioxide
• Temperature
• Relative humidity
• Volatile Organic Compounds (VOC)

Connectivity

• RS-485 with Modbus

Power requirements

• Input voltage: 5 - 30 V DC

Veles Smart Household

Goal of this project is to create FOSS 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

WIP

MODBUS Registers

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