Sensor Clock

The sensor clock is intended to be a general purpose clock/alarm clock, as well as a host to a number of environmental sensors, including CO2, Temperature, and Humidity sensors.

Parts

• Adafruit nRF52840 Express
• Adafruit 2.13 Tri-Color eInk Display
• Adafruit DS3231 RTC
• Sparkfun 7-Segment Serial Display
• Sensirion SCD30
• 2x Piezo Buzzers
• A few brick-mount boards
• Some LEGOs for a case

The parts communicate over I2C. The top and bottom boards are connected via QWIIC connectors.

Displays

The Seven Segment display rotates between:

• Time
• CO2 measurement
• Temperature measurement
• Humidity measurement
• Uptime measurement

The ePaper display will be used to show a graph of the last 3- or 48-hours of CO2 levels.

Wiring

This is using two Half Proto Boards for the current prototype.

Future Plans

• Add notification LEDs
• Add Wireless for sensor readings
• Implement buzzers