Now we do our conversions just like above. 121.779 / 5280 = .023 miles .94 / 60 / 60 = .000261 hours .023 / .000261 = 88.12 mph. So there you have it! How to calculate how fast you throw a baseball without a radar gun and only a stop watch.
IR Receiver and Remote. An IR receiver can detect bursts of infrared light sent by a common remote controller (like for a television), and then output a pattern of high/low signals to a Propeller I/O pin. This quick tutorial will first show you how to wire up the infrared receiver.
Uses of infrared radiation. We cannot see infrared radiation, but we can feel it as heat energy. Infrared sensors can detect heat from the body. They are used in: security lights; burglar alarms; Infrared radiation is also used to transmit information from place to place, including: remote controls for television sets and DVD player