Gravity: 4 Channel Relay Shield for Arduino USB Style_No USB so we unplugged it)

so we unplugged it)

1x Magnetic Contact Switch (door sensor)

Ideal for checking unmarked SMD resistor and capacitor values

We've also changed the default protocol to be I2C instead of SPI

Gravity: 4 Channel Relay Shield for Arduino USB Style_No USB so we unplugged it)This Relay Shield for Arduino acts like a switch. It is commonly used to control anything over 5V such as lamps, water pumps and garage doors. One of the most interesting projects for your boards is perhaps being able to control High power devices like Lamps, water pumps, garage doors and so on. But interfacing with high power is quite a dangerous task when building the circuitry. Relays allow for interfacing an external electrical circuit like a