Connect different sensors to a Photon and log/visualize the values periodically to monitor an indoor environment. Currently supported sensors:

• temperature + humidity
• illuminance
• movement
• battery charge

Hardware:

• Particle's Photon
• optional: battery shield (with MAX17041 state of charge sensor) for Photon (Sparkfun's or Particle's) + LiPo battery
• PIR sensor
• temperature and humidity sensor (Si7021, BME280 or HTU21D)
• ambient light sensor (TSL2561 or TSL2591)

Software for logging and visualization:

• InfluxDB
• Grafana or
• Ubidots (Note: I use a Raspberry Pi 3 as the local server running InfluxDB + Grafana)

Other features:

• add tags as meta information of the measurements conditions like the location (which room) and the use of a humidifier. the meta-data can be remotely configured (using Particle cloud functions) and it's stored in emulated EEPROM on the Photon so it can be recovered in the event of a reset
• when data is captured and logged, the device is put in sleep mode to maximize battery life in the case of a portable usage. the current configuration allows a cycle of up to 5 seconds to capture and log the data and a minimum of 25 seconds in sleep mode.

To be added:

• sound (using an amplified analog mic)
• ambient air pressure (if using BME280)
• support for using Particle firmware/cloud service on a Raspberry Pi