Appendix: Cost Details
RCT-433-AS $2.24
RCR-433-RP $3.53
2 Prototyping breadboards (Free
From Lab)
1 Keyboard (Scavenged
Old keyboard)
PS/2 Socket $0.40
PS/2 Plug $0.99
2 ATMega32 Processors (Free
From Lab)
1 STK 500 board (Free
From Lab)
Miscellaneous electrical components (Free From Lab)
Total: $7.16
Note that originally we ordered the Radiotronix
RCR-433-HP receiver for $11.29, but we received the RCR-433-RP receiver for
$3.53 because the company was out of stock on the receivers which we wished to
obtain. The difference between the two receivers
is that the HP version has a longer range and it appears to have a more robust
receiver design than the RP version we received. Although we can not say for sure, it is
possible that if we did obtain the receiver chip we ordered, our keyboard would
be more resilient to external interference.