In calculating the cost of Coach Baseball, I first determined which components would be needed. For Coach Baseball to function, he needs speakers, a voice chip to enhance the quality of sound, an acceleration sensor to measure the speed of the bat when swung, an LCD screen (pixel) on the bat to display statistics and feedback from Coach Baseball, 5 infared emitters to send information (4 of which will be placed on the bat and one of which will be placed on the pitcher), 5 infared receivers to receive information (1 that will be placed on the pitcher himself, 3 hidden within the fans, and 1 that will be on the bat), a computational processor to interpret information about the user's swing, a radio control that allows the on/off button on the bat to turn on the Coach Baseball unit, 3 rumble motors for realistic effect (which will be placed on the bat), and 5 small servo motors to make Coach Baseball move (three for the pitcher's arm, one for his head, and one for his mouth). Along with these costly components, Coach Baseball will also require one button on the bat, and an on/off button on the bottom of the handle of the bat. The total cost of all these parts came out to 2900 credits , which is under the 3400 credit limit. Translating credits into dollars, all the parts necessary to make Coach Baseball came out to $42.65, which is under the $50 limit. Since there were no budget limitations on my interactive toy, I was able to enhance the quality of the toy by purchasing nonessential yet quality enhancing parts. I did not only focus on essential parts, resulting in a toy that can just complete its functions, but I let myself choose parts that I thought would enhance the quality of toy. I was able to include a voice chip in order to improve the quality of sound coming out of the speakers, and also the pixel LCD screen for the bat, which will not only give the user visual access to his/her performance and statistics, but is the better quality LCD screen. I was also able to include 3 rumble motors so that the user can not only tell if he/she hit the ball, but also how solid the hit was. If the hit is more solid, then the rumble packs will vibrate more vigorously. In addition to having no problems with budget limitation, I have a lot more leeway to add more parts if necessary. For example, I might need two sensors and two emitters more complex than the infared ones for two reasons. One reason is for the bat to be able to receive the information about the user's swing from the Coach Baseball Unit so it can be displayed on the LCD screen. The second reason is for the information from the acceleration sensor in the bat to be sent to the computational processor in the Coach Baseball Unit for interpretation. **The cost would still be under $50.** Overall, I have not been burdened with any budget limitations, so I have been able to freely yet wisely choose my parts.
**Double checked by Dave**