 | NXT Plant Waterer We built a device to automatically water houseplants when the soil becomes too dry. This robot uses the Vernier Soil Moisture Sensor, the NXT Sensor Adapter, and a LEGO Hand Pneumatic Pump to control the soil moisture content for a plant, automatically watering the plant when it is too dry and stopping when it is too wet. The NXT program specifies upper and lower soil moisture levels. Water is in the bottle reservoir. If the soil is too dry, the motor operates the pump, forcing air into the top of the reservoir. The increased air pressure pushes the water out of the reservoir and onto the plant. When the maximum soil moisture is reached the motor shuts down and the Soil Moisture Sensor monitors the soil as it dries, repeating the watering cycle as needed. This is simulated in this movie by moving the Soil Moisture Sensor back and forth between wet and dry soil samples. For a full project description, visit http://engineering.vernier.com/general/projects/plant-waterer/ |
 | NXT Balancer We built a device to automatically balance a horizontal beam as weights are added to either end. This robot uses a Vernier Low-g Accelerometer to measure the tilt of a long beam. At the start, there are 10 gram weights on each side of the horizontal beam. As weights are added or removed, the beam unbalances and tilts. The accelerometer senses the tilt, and the NXT motor moves the balance point of the balance beam left or right in order to balance it again. Some RCX parts were used in this project. For a full project description, visit http://engineering.vernier.com/general/projects/balancer/ |
 | Hacking the LEGO Mindstorms NXT Standard Motor Hacking the LEGO Mindstorms NXT Standard Motor. See also "quadrature encoder" at wikipedia and the LEGO NXT datasheets. |
 | Lego Mindstorms Fish Bot Function: Sprinkles just the right amount of fish food into the aquarium! Favorite food: Worms Bio: Chores getting you down? Trusty Fish Bot is on the job! Right on cue, he'll lift up a container of fish flakes, spin it around, and sprinkle a precise amount into the tank to feed your finny friends. If only little brothers were so reliable! |
 | Lego CM2 Coin Sorter (CM2) Coin Master 2 is an updated version of my Lego Mindstorms NXT Coin Sorter. Dump your coins into it's newly designed dual action separator and they are more quickly sorted, counted and totaled. A newly designed synchronized separator/sorting containment system increases coin processing. The sorter uses only 2 NXT motors to accomplish it's task. A Lego figure points to the detected coin value as it slides past the NXT light sensor and triggers the indicator light on the control panel. |
 | NXT Leveler This project uses the Vernier Low-G Accelerometer as a tilt sensor. The sensor is connected to the NXT via a prototype of the Vernier LEGO NXT adapter. The simple NXT program has the robot move forward carrying a cup on a level platform. At the same time, the robot monitors the signal from the accelerometer. If it notices that the accelerometer reading changes, it uses the third motor to rotate the platform back to level. In the video the robot goes down and up a couple small hills. Later, the video shows a close-up view of the leveling action as the robot is held and rotated. For a full project description, visit http://engineering.vernier.com/general/projects/leveler/ |
 | NXT Standalone - kabellose Version Auf zwei Rädern aufrecht rollender Roboter, programmiert mit LABview 8.20, aufgebaut mit LEGO Mindstorms NXT. Mehr Infos auf: http://www.brumann-art-production.ch/NXT_Standalone/ |
 | NXT Blind Student Assistant We used LEGO® MINDSTORMS® NXT to create two programs that could be very useful to a blind student in a science course. The program speaks Vernier sensor readings or makes a tone with a frequency proportional to the sensor reading. The challenge was to help blind students do real lab experiments and make the solution affordable, easy, and compatible with sensors that are available in many high school and college science labs. We used a LEGO® MINDSTORMS® NXT program to speak sensor readings and make sounds. The solution yields concrete scientific results, making it easy to form relationships and draw conclusions. Our demonstration requires only a 1 meter square desktop area and 120-volt AC power. To demonstrate the usefulness of this program, we carried out two experiments. The first tested the pH of three liquids: orange juice, milk, and cola. By following these instructions, we determined the pH of the liquids were 4.0, 6.7, and 2.7, respectively. This could be done with any liquids in any lab experiment. With slight modification of the code, we could perform a titration experiment by making the NXT beep once the equivalence point is reached. In the second experiment, we wanted to observe the inverse-square law by using a light sensor and light source. The closer the light sensor was to the light source, the higher the reading was, and so the NXT made a higher pitch. Making a tone in this experiment was more useful than speaking a value, as it quickly allowed us to find the light source and easily confirm the inverse-square law. For a full project description, visit http://engineering.vernier.com/general/projects/blind-student-assistant/ |
 | NXT Battery Tester We built a device to test the current flow through a battery as it lights up a lamp. This is one LEGO NXT project we hope to use for a practical purpose. When we are doing robots projects, we end up with a lot of partially used AA batteries. We thought it would be fun to have an automated way to test those batteries so that we use those with some life left. Since we know it is best to test a battery with a load (instead of just reading the voltage), we set up a circuit with a small incandescent lamp and a Vernier Current Probe. The NXT mechanism advances a battery into position with one motor. A second motor moves contacts into place to touch the two ends of the battery. The NXT Sensor Adapter allows the NXT to read the current. If the battery causes much current to flow, you can also see the lamp light up. The NXT makes a decision based on the current that flows. If the current is above the threshold level, the battery is moved to the left bin. If the battery is too weak, the battery is moved to the right bin. It is relatively easy to make a device to do this test a few times. It is very difficult to make one which will do it over and over again without jamming or failing. The movie of this project shows the sorting of four batteries. The last part of the movie shows a close-up view of a battery going through the testing process. For a full project description, visit http://engineering.vernier.com/general/projects/battery-tester/ |
 | NXT Pit Viper We made a snake robot that uses two surface temperature sensors to detect its prey. We like to mimic biology. Snakes that belong to the pit viper family are named for the heat-sensing organs located near the eyes, known as pits. This allows pit vipers to quickly and accurately find their prey. While our robot won't strike within milliseconds, it can find prey using its own Vernier Surface Temperature Sensors as pits. First, a metal can is filled with hot water. The greater the difference in water temperature to surrounding air temperature, the easier it is to find prey. Once the robot is started, the pit viper compares the two temperatures and moves in the direction of the warmer sensor. If the snake overcompensates or its prey moves, the snake changes directions. When the difference in temperature is consistently zero, the snake strikes. This model was built using three 40-tooth gears to alter the gear ratio. Each NXT kit only comes with two 40-tooth gears, so you may need to substitute the turntable for the 40-tooth gears if you only own one kit. The last photo uses a turntable. For a full project description, visit http://engineering.vernier.com/general/projects/pit-viper/ |
| Oceanfrontier Hideaway | |
| Sheraton Suites Philadelphia Airport | |
| The Boulders Resort and Golden Door Spa | |
| Coral Beach Club |
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