Mark likes his martinis dry, but never his Christmas trees. To avoid his tree turning into kindling prematurely, he created an automatic watering device that keeps it fresh and helps it last longer. His system pumps water from a 1-gal reservoir via a pump powered by a 12V dc power supply. Level sensors maintain the water level and provide overflow control. To avoid the risk of soggy Christmas presents, he suggests testing the system for water leaks in advance of use.
For Mark McCuller's complete instructions on how to build your own Electronic Christmas Tree Watering System, click here.
Electronic Christmas Tree Watering System Parts List
Allied Part #
Quad 2 input and gate
2N2222 transistors NPN
Resistors 1K ƒ¶, 0.5W
Protoboard 0.1?~ 0.1 inch spacing
Power supply +12V dc and +5Vdc
Level sensor switch
Dip socket 14-pin
Terminal block PCB mount
Additional parts required: Automotive windshield water pump, plastic 1-gal reservoir, 12-ft plastic tubing, assorted bolts and nuts, metal supports for sensors, Styrofoam flat (1.5-inch balls), cable (see website for complete specs)
Some humanoid walking robots are also good at running, balancing, and coordinated movements in group settings. Several of our sports robots have won regional or worldwide acclaim in the RoboCup soccer World Cup, or FIRST Robotics competitions. Others include the world's first hockey-playing robot and a trash-talking Scrabble player.
A recent example of a major CAE revamp is MSC Apex, released last month by MSC Software Corp. In a discussion with Design News, MSC executives noted that its next-generation platform is designed to substantially reduce CAE modeling and process time, “in some cases from weeks down to hours.”
The Thames Deckway would run for eight miles close to the river’s edge, rising and falling slightly with the tidal cycle. It will generate its own energy from a series of devices that will line the pathway and use a combination of sources to make the path self-sustaining.
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