Diodes for beginners
Not just LEDs
Hall sensor module KY-003 & KY-024 for Raspberry Pi and Arduino
Small magnetic sensor that can be used as a switch or a detector.
Sonar HC-SR04 ultrasonic ranger for a Raspberry PI & Arduino
How to connect HC-SR04 Sonar module to Raspberry Pi
Relay Module KY-19 (Songle SRD-05VDC-SL-C)
Switch things on and off! Simple, cheap and functional.
Electronic components are useful!
It's very useful
Beginner’s electronics guide Raspberry Pi, Arduino
Essential electronic knowledge to have to understand circuits better!
Sensors onboard – DockerPi Sensor Hub
52pi's DockerPi Sensor Hub comes with the most popular sensors packed in a nice I2C-enabled HAT.
LED modules for Raspberry PI, Arduino
Everything you need to know about LEDs to get started.
Infrared Sensor HC-SR501 PIR Motion Sensor for a Raspberry PI and Arduino
How to use PIR sensor with your Raspberry PI.
Lasers! KY-008 laser module for Raspberry Pi & Arduino
You can never go wrong with lasers!