| Raspberry Pi Camera Module 3 | ~$25 | Computer Vision with OpenCV and Picamera2, Raspberry Pi Companion Computer for an ArduPilot Drone, Smart RC Car: Drive from Your Phone with a Live Camera +13 | Buy on Amazon ↗ |
| Raspberry Pi Camera Module 3 Wide | ~$35 | Pi Zero Drone Camera and GPS Flight Logger, Self-Driving RC Car with DonkeyCar and a Neural Network, DIY Smart Doorbell with Camera Snapshot +5 | Buy on Amazon ↗ |
| HC-SR04 ultrasonic sensor (5 pack) | ~$9 | Obstacle-Avoiding Robot with Raspberry Pi, Build a Rover with 3D-Printed Parts from the Vault, Desk Robot with OLED Eyes and a Turning Head +1 | Buy on Amazon ↗ |
| BME280 temp/humidity/pressure sensor | ~$9 | I2C Sensors: Read Temperature, Humidity and Pressure, ESPHome Room Sensor: Temperature, Humidity and Motion, Weather Station with a Live Web Dashboard +10 | Buy on Amazon ↗ |
| PMS5003 air quality (PM2.5) sensor | ~$25 | Air Quality Monitor (PM2.5) with OLED Display | Buy on Amazon ↗ |
| PIR motion sensor (3 pack) | ~$8 | ESPHome Room Sensor: Temperature, Humidity and Motion, Wildlife Trail Camera with PIR Trigger | Buy on Amazon ↗ |
| Capacitive soil moisture sensor (5 pack) | ~$9 | Automatic Plant Watering with Raspberry Pi Pico, Solar LoRa Sensor Node for Far Fields | Buy on Amazon ↗ |
| MPU6050 / ICM IMU module | ~$7 | Room-Mapping Robot with LiDAR and ROS 2 SLAM, Self-Balancing Robot with a Pico and a PID Controller, Vibration and Earthquake Logger with an Accelerometer +5 | Buy on Amazon ↗ |
| GPS module (u-blox M10) | ~$20 | Raspberry Pi Companion Computer for an ArduPilot Drone, Pi Zero Drone Camera and GPS Flight Logger, Autonomous GPS RC Boat with ArduPilot Rover +3 | Buy on Amazon ↗ |
| 2D LiDAR scanner (RPLIDAR-class) | ~$99 | Room-Mapping Robot with LiDAR and ROS 2 SLAM | Buy on Amazon ↗ |
| IR line-tracking sensor array | ~$8 | Line-Following Robot with Raspberry Pi Pico, Mini-Sumo Robot with a Raspberry Pi Pico | Buy on Amazon ↗ |
| A3144 Hall-effect sensors + magnets | ~$8 | RC Car Speedometer and Battery Telemetry on Your Phone | Buy on Amazon ↗ |
| Magnetic reed door switches (5 pack) | ~$9 | Garage Door 'Left Open' Alert, Automatic Chicken Coop Door at Sunrise and Sunset, Mailbox Notifier: Know When the Mail Arrives | Buy on Amazon ↗ |
| LD2410 24 GHz mmWave presence sensor | ~$8 | mmWave Presence Sensor: Lights That Know You're Still There | Buy on Amazon ↗ |
| PoE IP security camera (RTSP) | ~$60 | AI Security Camera Recorder with Frigate, Driveway Car Alert with Frigate Zones | Buy on Amazon ↗ |
| SCD40 true CO2 sensor | ~$40 | CO₂ Monitor That Tells You When to Open a Window | Buy on Amazon ↗ |
| Raspberry Pi HQ Camera + lens | ~$75 | Astrophotography with the Raspberry Pi HQ Camera, Safe Sunspot Imaging with the Raspberry Pi HQ Camera | Buy on Amazon ↗ |
| INA219 current/power sensor | ~$7 | Measure Real Power Use with an INA219 Sensor, Off-Grid Solar-Powered Raspberry Pi, Battery Bank State-of-Charge Monitor +1 | Buy on Amazon ↗ |
| MLX90640 thermal camera module | ~$60 | — | Buy on Amazon ↗ |
| RC522 RFID reader + tags | ~$8 | Family Check-In Board with RFID Tags and a Touchscreen | Buy on Amazon ↗ |
| USB webcam 1080p | ~$25 | Motion-Alert Camera That Sends Photos to Your Phone, All-Sky Meteor Camera for Citizen Science, Wireless CNC and Laser Controller with CNCjs | Buy on Amazon ↗ |
| AS3935 lightning sensor module | ~$25 | Lightning Detector: Know When Storms Approach | Buy on Amazon ↗ |
| Load cells (4×50 kg) + HX711 amplifier | ~$12 | Smart Beehive Scale and Climate Monitor, Package Delivery and Pickup Alert with a Smart Weight Mat | Buy on Amazon ↗ |
| IR break-beam sensor pair | ~$8 | RC Lap Timer with an Infrared Gate | Buy on Amazon ↗ |
| Water leak / rain sensor | ~$6 | Water Leak Alarm Under the Sink | Buy on Amazon ↗ |
| TSL2591 high-dynamic-range light sensor | ~$8 | Light-Pollution Sky Quality Meter with a TSL2591 | Buy on Amazon ↗ |
| Cup anemometer with reed-switch pulse output | ~$30 | Wind Speed and Small Wind Turbine Power Logger | Buy on Amazon ↗ |
| Zigbee door/window contact sensors (4 pack) | ~$40 | DIY Home Alarm with Zigbee Door and Window Sensors | Buy on Amazon ↗ |
| Zigbee wireless smart button | ~$15 | Help Button for an Elderly Relative That Alerts the Family | Buy on Amazon ↗ |
| Tipping-bucket rain gauge (reed switch output) | ~$25 | Tipping-Bucket Rain Gauge on a Raspberry Pi | Buy on Amazon ↗ |
| LTR390 UV and ambient light sensor | ~$8 | UV Index Monitor with ESPHome | Buy on Amazon ↗ |
| DS18B20 waterproof temperature probe | ~$8 | Aquarium Monitor: Water Temperature and pH, Pond and Pool Water Level and Temperature Monitor | Buy on Amazon ↗ |
| Analog pH sensor board + probe | ~$30 | Aquarium Monitor: Water Temperature and pH | Buy on Amazon ↗ |
| JSN-SR04T waterproof ultrasonic distance sensor | ~$12 | Pond and Pool Water Level and Temperature Monitor | Buy on Amazon ↗ |
| MAX30102 optical heart-rate sensor module | ~$7 | Heart-Rate Display with a MAX30102 and a Pico | Buy on Amazon ↗ |
| SGP30 VOC / eCO2 gas sensor | ~$15 | 3D Printer Enclosure Guard: Heat and Fume Monitor with Auto Shut-Off | Buy on Amazon ↗ |
| 5 kg load cell + HX711 amplifier | ~$10 | Filament Spool Scale: Know How Much Is Left | Buy on Amazon ↗ |