Led Globe

Led Globe

Led Globe

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led globe 1

Led Globe

This static balancing, however, does not replace dynamic balancing during operation; that can only be done experimentally with the finished globe. Patience is needed so that placement of weights on the speeding globe does not cause it to wobble like a failed washing machine.
led globe 2

Led Globe

To display, for example, continents on the globe, we need to turn our image into a bit-pattern that can be readily integrated into an Arduino sketch. I wrote the software POV Globe Calculator (PC only) to make this easy. You can download it here.
led globe 3

Led Globe

The more evenly the holes for the LEDs are placed, the better the globe image will be. Since our drill press runs true (and center-punching plastic sucks) we made a small drilling template from aluminum scrap, with 7 holes spaced 6mm apart. After drilling 7 holes, we advanced it and drilled again, aligning it by putting an LED in the last hole drilled. Thus we succeeded in very accurate (and stress-free) drilling.
led globe 4

Led Globe

LED bulbs save you money Our range of LED bulbs provides you with an ideal way to light your home while saving money on your electricity bill and decreasing your carbon footprint. All of the bulbs in our LED lighting range consume 85% less energy than normal incandescent bulbs. They also last up to 20 times longer, which drastically reduces your need to replace bulbs. Our bulbs come in all different shapes and sizes, making it easy for you to coordinate them with your ceiling lights or living-room lamps to create a lighting fixture that complements your room.
led globe 5

Led Globe

When the globe is spinning, the bit-pattern that’s output to the LEDs must always begin at precisely the right instant. The purpose of the Hall sensor mounted on the ring is to fly past a stationary magnet with each revolution. This triggers a hardware interrupt on Arduino pin D2, providing the “ignition timing” for starting each output. The output frequency is also calculated from the rotational speed so that the pattern can be sent at a matching speed.
led globe 6

Led Globe

Since power is not always transmitted smoothly through our globe’s ball-bearing “slip ring,” we buffer the voltage in a 2200μF electrolytic capacitor. This then transmits power to the voltage regulator pin (Vin) of the Arduino and operates the built-in voltage regulator in the opposite direction. We protect the Arduino with a diode, but still — it’s an impermissible operating status that may well “Void Your Warranty.”
led globe 7

Led Globe

For the first tests we mounted the shaft at the upper end too, so we could run the globe even though the rotor wasn’t perfectly balanced. In our final version, we have omitted the “tree” (and the upper bearing) entirely.
led globe 8

After starting the software, you’ll set the resolution of your globe: vertical (number of LEDs) and horizontal (how many vertical segments you want to draw). Then click on New Grid in the top left corner. Load a background image if you wish, then left-click on the pixels of your grid to draw them in (blue) or right-click to delete them again (Figure ). Clicking Invert will reverse them all.
led globe 9

You can download the Arduino sketch and follow along with the comments to see what the code is doing. In the declaration part of the sketch, we input the basic data for our globe. The image we’re drawing is stored in a 2-dimensional array. The first dimension is the number of shift registers, the second is the number of columns to draw (referred to in the program as segments). This entire block can be generated by our POV-Calculator and then just copied into the sketch.
led globe 10

Our range of LED bulbs provides you with an ideal way to light your home while saving money on your electricity bill and decreasing your carbon footprint. All of the bulbs in our LED lighting range consume 85% less energy than normal incandescent bulbs. They also last up to 20 times longer, which drastically reduces your need to replace bulbs. Our bulbs come in all different shapes and sizes, making it easy for you to coordinate them with your ceiling lights or living-room lamps to create a lighting fixture that complements your room.
led globe 11

In most POV displays, a linear (1-dimensional) array of LED lights rotates around a single point, like a bike wheel. By measuring their rotation rate and controlling their flashes with millisecond precision, we can create the illusion of a 2-dimensional image lingering in thin air.
led globe 12

For easier assembly and repair, we didn’t solder the LEDs to the circuit board, but connected them with female jumper wires. These come with a connector on each end; since we need just one connector per lead, we cut them to make 2 leads from each jumper. The cable ends are stripped a few millimeters and a piece of heat-shrink tubing is slipped over each one. On each LED, the positive lead (anode, the longer leg) is bent outward at a 90° angle. The negative lead (cathode, shorter leg) is cut to 5mm–7mm in length and bent into a small eyelet. Then the positive lead is trimmed to 10mm–15mm long and the stripped cable end is wound around it, soldered in place, and insulated with the heat-shrink.
led globe 13

We clipped the corners of our perf board to fit in our rotor ring, then we distributed the IC sockets for the shift registers evenly on the right side. Leave at least 3 or 4 holes between each socket; you’ll need the space for soldering components. Carefully position the 74HC595s so that their outputs QB–QH (pins 1–7) face the board edge, which allows you to have a shorter connection to the male headers for the LED cables. Between the chip outputs and headers, we soldered 100Ω resistors standing upright, to save space. For output QA (pin 15) on the other side of the chip, there’s room to solder its resistor flat.
led globe 14

When you’re done, click the Calculate button to automatically generate the code for your LED array. Just copy it into your Arduino sketch, or store it for later revision.
led globe 15

For time measurement, we use the Arduino’s 16-bit Timer 1. On the first hardware interrupt (INT0) from the Hall sensor on pin D2, the interrupt handler TIMER1_INT0_vect sets Timer 1 to zero. On the next interrupt, we read the timer again; this value now represents the time (in processor clock cycles) required for the LED strip to make one complete revolution. We now divide this value by the number of segments we want to display. The result is then assigned to the 8-bit Timer 0 as the correct interval for redrawing the LEDs.

Published on May 21, 2016 | Under News | By admin
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