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.
Laser thermometers are actually infrared thermometers. The laser is just there to make the thermometer easier to aim. Molecules are vibrating constantly; the hotter the molecule is, the faster it vibrates, creating infrared energy. Infrared (IR) thermometers measure the infrared energy given off by all objects.