RPI-1031 RPI 1031 Angle Sensor Module 4DOF Attitude HM Module Stable For Arduino 4 Pin 4 Direction Sensor Attitude HM LED Accessories With Pin Header Board

Features:

• 1.Based on optics principles, its interior has LED for 1pcS,photosensitive receiving triode for 2pcs;and the other side has one cylindrical shade; just as the picture shows:
• 2.By cylindrical shade to keep out the LED, and photosensitive receiving tube is for detecting RPI-1031 current state
• 3.When RPI-1031 rotates to the state shown as below, LED is shadowed by the shade; and two photosensitive receiving triodes cannot receive the light; they will be in off state, output low level; two GPIO ports both output low level 
• 4.When RPI-1031 rotates to the state shown as below, one of the photosensitive triode was shadowed, the light emitted by LED only can be received by the other one; that means above photosensitive triode is on, and photosensitive triode under side is off; then two GPIO ports output respectively output high level and low level
• 5.When RPI-1031 rotates to the state shown as below, the shade does not shadow; the diode will shine, two photosensitive triodes can receive the light; then all of them will be on, both of two GPIO ports output high level
• 6.When RPI-1031 rotates to the state shown as below, this state is adverse to description 4;two GPIO ports output level will be inter changed
• Specifications: Size:10×15 mm