Block Diagram

I2C
(100KHz)
[1]
LoRa & MCU module
(32MHz TCXO)
(32.768KHz XTAL)
UART
(9600)
CO2 sensorMicrophone
Antenna
(Fc = 890MHz)
(BW = 40MHz)
Mode indicator LED
[Red & Green]
Ambient light sensor
Signal conditioning
(Amplify, rectify &
filter)
3.3V
Power supply
3.3 to 6.4V
Batteries
(4 x AA 1.5V)
EEPROMVOC sensor
Temperature &
Humidity sensor
VBAT
VBAT Measurement
Project:
Officesense 2.0
Client:
Capgemini
Author:
Tom Klijn
Project number:
PXXXXXX
Revision:
V01
Date:
10-06-2020
Block diagram: Officesense 2.0
[1] Transmit center frequency is variant dependent: Center frequency is 868MHz for Europe and 915MHz for USA
Motion sensor