First

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Across
  1. 2. Electrical potential difference, output from many analog sensors
  2. 4. Sensor that detects motion based on body heat
  3. 7. Invisible light used in motion detection and remote controls
  4. 8. Type of sensor that detects presence of gases like CO2 or LPG
  5. 12. Biometric sensor used for security and identity
  6. 14. you like a printable crossword grid or an interactive ver
  7. 15. Sensor that uses sound waves to measure distance
  8. 18. Measurement of heat; sensed by LM35 or TH11
  9. 19. A key environment element for farming; its moisture is often monitored
  10. 20. Process of sensing presence, motion, or level
Down
  1. 1. Infrared sensor used for obstacle detection
  2. 3. Type of signal that varies continuously over time
  3. 5. Amount of water vapor in the air, often sensed in smart agriculture
  4. 6. A device that detects and responds to physical input
  5. 9. Popular microcontroller used to interface with sensors
  6. 10. Type of signal with discrete values, often binary
  7. 11. Indicates the water content in soil
  8. 13. Sensor used to monitor heartbeats
  9. 16. Light-dependent resistor used to measure light intensity
  10. 17. Precision temperature sensor with analog output
  11. 18. A sensor used to measure both temperature and humidity