Angle Sensor Compatible With Ez-B V4

Hi fellas,

I was planning on using an angle sensor to get readings in 2D plane, just the horizontal. I was wondering if anyone here has experience using such sensors in conjunction with EZ-b.

Following are the two low cost sensors i've considered so far, any advises and tutorials would be wonderful.

Option 1; https://dx.com/p/angular-transducer-tilt-slant-angle-sensor-module-for-arduino-150783

Option 2: https://dx.com/p/gy-272-3-axis-hmc5883l-compass-module-153211

PS i just need to measure the yaw movement, the rest comes from IMU. Thanks