Seeed grove motion sensor control and actuator modules seeed studio 101020025 when the grove tilt switch from seeed studio is lying flat the switch contacts are open tilt it and they close this translates to a logic 1 when tilted and a logic 0 when flatseeed provide technical documentation example projects and software libraries on their product pages if you require this information please visit this products page seeed 101020025 grove tilt switch no digital input type