By Jon Lazar
We all understand how notable LEGO is, and a growing number of everyone is studying what percentage extraordinary belongings you can do with Arduino. In Arduino and LEGO Projects, Jon Lazar indicates you ways to mix of the good issues on this planet to make enjoyable instruments like a Magic Lantern RF reader, a sensor-enabled LEGO track field, or even an Arduino-controlled LEGO educate set.
- Learn that SNOT is de facto cool (it capability Studs now not on best)
- See exact causes and photographs of the way every thing matches jointly
- Learn how Arduino matches into every one undertaking, together with code and reasons
Whether you must provoke your mates, annoy the cat, or simply relax and take pleasure in the awesomeness of your creations, Arduino and LEGO Projects indicates you simply what you would like and the way to place all of it jointly.
Read or Download Arduino and LEGO Projects PDF
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Additional resources for Arduino and LEGO Projects
To complete the Android’s leg, flip it over and place two 2 x 4 green bricks across the middle of the leg to give it a rounded look Figure 2-45. The Android’s completed legs 59 Chapter 2 ■ Using Sensors with the Android Figure 2-46. The Android stands on its new legs. The outer edge of the legs should line up with the outer edge of the lowest level of the Android’s body With the head, body and legs done, the next step is the arms. Building the Arms Building the arms is identical to building the legs, but just taller.
In your function, you are dividing the number of microseconds it takes sound to travel an inch and dividing by two, since the duration takes into account the time it takes the pulse to travel to and from the object the sound waves are bouncing off of and returning that value to the function call. By testing the code and looking at the Serial Monitor, you can see that it takes about 1000 milliseconds to go approximately 6 inches, which you can use to trigger the LED. You check if the duration is larger than 1000 with an if statement, and if it is, you set the LED to turn off; otherwise the else statement means the object in front of the ultrasonic sensor is 6 inches or less from the sensor and it will turn on.
Any change to variables within the function does not impact the rest of the program unless a value is returned. In the function microsecondsToInches(), you are doing some fairly simple mathematics, so you are doing the math and returning the value on the same line. You could do more complex processing and set the value to a variable, then have the code read return variable to export the answer from the variable rather than directly from the line of code. In your function, you are dividing the number of microseconds it takes sound to travel an inch and dividing by two, since the duration takes into account the time it takes the pulse to travel to and from the object the sound waves are bouncing off of and returning that value to the function call.