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GCSE Electronic Products Specification Design and manufacture a Skeeball counter game that will count / add up points depending on which column the ball passes through.

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Introduction

GCSE Electronic Products Specification Design and manufacture a Skeeball counter game that will count / add up points depending on which column the ball passes through. It will need to: -Have five LDR's part number 58-01-0134 costing �0.30 for 1+ or as a bulk of 25+ for �0.24 from the website www.rapidonline.com. The LDR's will be used in the input of the circuit in series with another resistor so it will detect any change in the light density, changed when the ball passes the LDR' light source, which is an LED -Have a five 100k variable resistors part number UF97F costing �0.31 for 1+ from www.maplin.co.uk. They will be used in series with the LDR's. The reason I'm using a variable resistor as I will need to set a precise resistance to detect the ball when it passes the LDR's. -Have ten 555's part number 82-0336 costing �0.13 for 10+ from www.rapidonline.com. They will be used as five monostable and five astable in the control of my circuit. -Have five 10k resistors part number 63-2344 costing �0.17 from www.rapidonline.com. ...read more.

Middle

They will be used to control the two 7 segment displays. -Have fifteen LED's 5mm part number 56-1250 from www.rapidonline.com costing �0.11 for 1+ and �0.088 for 100+ that will be on all the time to keep the light intensity of the LDR's constant. Also will be used at the test points to show if the circuit is working or not. - Have two red 7-digit LED displays part number 57-0169 from www.rapidonline.com costing �0.29 for 1+ that will be used to show the points counted. GCSE Electronic Products -Have a Double pole, single throw latching, and slide switch, part number 76-0100 that costing �0.11 for 1+, that will be used for an on/off switch of the whole circuit. -Have a black push to make switch part number 78-1522 costing �0.30 for 1+ from www.rapidonline.com. That will be used to reset the LED displays. -Have a battery holder from www.rapidonline.com part number 18-0163 costing �0.18 for 1+ that will hold a 9V battery with the purpose of powering the circuit. -Have four printed circuit board stand-offs from www.rapidonline.com part number 26-5873 costing �0.24 each that will be used to hold the circuit off the housing ...read more.

Conclusion

-Have a 9 volt battery from www.maplin.co.uk part number N71BT costing �2.99, that will be used to power all of my circuit. It will be put into the battery holder I mentioned before. -Have ten 10mm screws from www.maplin.co.uk part number N98CR costing �2.99, that will be used to hold down the plastic cover that blocks light getting to the LDR's, also to hold the base of the box so that it can be opened if the circuit needs to be accessed. -Have four terminal blocks from www.maplin.co.uk part number RH76H costing 0.49 each. They will be used to hold the wires from the LDR's, Led's, battery and switches. -Have a PCB board from www.maplin.co.uk part number BW19V costing �3.34 each. It will be used to build my circuit on. -Have four self adhesive PCB pillars from www.rapidonline.com part number 33-2130 costing �2.10 for a pack of 25. They will be used to hold the circuit to the housing. -Have ten tie wraps from www.maplin.co.uk part number NL18U costing �5.99 for a pack of 1000. They will be used to hold the wires together. -Have a battery holder from www.maplin.co.uk part number CK65V costing �1.29. It will be used to hold the 9V PP3 battery. ...read more.

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