Power Tools for Technical Communication:
Description Formatting


In this lab, you add headings, lists, and illustrations to the unformatted text of a description:
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  2. Study the unformatted text carefully, rearrange the paragraphs as necessary, add headings, and reformat text as numbered or bulleted lists as necessary.
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The CheapTech BikeLite is simply a battery-powered light source that can be attached to a bicycle for visibility when riding at night. Because it uses light-emitting diodes (LEDs) to provide its light, it is small (about 7 x 5 x 4 cm) and light enough (about 60 g including battery) to be detached and slipped into the rider's pocket when not in use. The BikeLite consists of two major parts (see figure 1): LED unit, which contains five LEDs together with the necessary electronics and battery; mounting bracket, which is used to fix the BikeLite on to a bicycle frame. The LED unit is detachable and is fixed to the bracket using a plastic clip. If required, the clip can also be used to fix the unit to a belt or other article of clothing.

Two versions of the BikeLite will be available, for the front and rear of a bicycle. These are identical apart from the colors of their faces and LEDs: Rear BikeLite red LEDs shining through a red face; Front BikeLite green LEDs shining through a colorless face. The LED unit is the shape of an elongated dome, and measures 70 x 40 x 38 mm. Its face is removable, and clips to the rear casing through a rubber O-ring to ensure that the BikeLite is waterproof. The face is unclipped with the aid of a small coin, making it easy to change cells when required. The face of the BikeLite is an elongated dome of 1.5 mm thick clear plastic, 70 mm long, 40 mm wide and 25 mm in depth (see figure 2). Clear red plastic is used for the rear BikeLite and clear colourless plastic for the front. The face is manufactured so that the LEDs shine through a 10 mm wide central focussing panel. The areas of the face above and below this panel are reflective, which enhances visibility by presenting a larger lit area to cars moving towards the cyclist.

The back casing holds the batteries, LEDs, and electronics necessary for the BikeLite to work (see figure 3). As the face clips on to it, the casing is an ovoid section measuring 70 mm by 40 mm with a depth of 5 mm, made of matte black plastic. The LED unit is fixed on to its mounting bracket using a clip, screwed on to the back of the back casing using a 2 mm screw (see figure 4). The clip is 40 mm high and 20 mm across its widest point, with an overall depth of 8 mm, and made of 1 mm thick matte black plastic. The central feature of the BikeLite is its five LEDs. These are each 8 mm in diameter and with a brightness of 0.8 Cd. They are glued into a printed circuit board (PCB), which is in turn fixed to the back casing with 1 mm screws (see figure 3). The rear BikeLite uses red LEDs, while the front version uses green ones. Several resistors are soldered on to the rear of the PCB, together with an Integrated Circuit (IC) and connections to the LEDs. A switch is also soldered to the rear of the PCB, with a rubber push-button protruding through the back casing. Pressing this button turns the BikeLite on and off.

Also contained in the LED unit are two 1.5 V AAA-cells. These are held in the back casing using a stainless steel spring assembly, which also links the cells in parallel (see figure 3). Insulated copper wires connect this assembly to terminals at the rear of the PCB. The mounting bracket for both front and rear BikeLites would be made of matte black plastic (see figure 5). The design for the body of the bracket is based on a C-shape 25 mm tall, with an internal diameter of 35 mm when closed. A round disc is moulded on to the round section of the C, with vertical guides on either side for attaching the clip of the LED unit. The disc is 25 mm in diameter and 1 mm thick, with the guides adding a further 2 mm to the thickness at the left and right sides. The bracket is held closed by a 2 mm nut and bolt, and grip on the bicycle frame is improved by inserting a rubber strip around the inside of the bracket.








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