This single-pole, double-throw (SPDT) momentary switch can be used as a general-purpose micro switch or tactile obstacle-detector for your robot. The switch body dimension is 20.0 x 6.4 x 10.2 mm and the lever arm is 16.7 mm long. This three-pin switch can also be used as a two-pin single-pole, single-throw (SPST) switch that is open or closed by default, depending on which two pins are used. The maximum operating force is 0.9 N, or approximately 90 gm.
Orange Pi Zero
The Orange Pi Zero development board powered by Allwinner H2+ quad core Cortex A7 processor with 256MB RAM, Ethernet, and USB ports offer an affordable alternative to Raspberry Pi Zero..