The Hall Effect Magnetic and Proximity Sensor Module can be used to detect the presence (or absence!) of nearby objects such as magnets. This sensor accepts a GND and +5V supply, and has a single digital output which goes low (GND) when a magnetic field is detected. The linear...
The Sound Sensor can detect the sound strength of the environment. The main component of the module is a simple microphone and LM393 level convertor chip. The sensor can provide both digital aswell as analog output....