Magnetic contact switch (door sensor) 4 Channel pico expander With both UART and I2C

With both UART and I2C communication interfaces

requiring only 4 digital I/O pins

Class D Audio Amplifier: This allows you to drive an 8Ω 1W or 4Ω 3W speaker for sound effects

Can run motors on 4

SWD connector for debugging and advanced use

Magnetic contact switch (door sensor) 4 Channel pico expander With both UART and I2CDescription This sensor is essentially a reed switch, encased in an ABS plastic shell. Normally the reed is 'open' (no connection between the two wires). The other half is a magnet. When the magnet is less than 13mm (0. 5") away, the reed switch closes. They're often used to detect when a door or drawer is open, which is why they have mounting tabs and screws. You can also pick up some double sided foam tape from a hardware store to mount these, that