Our postage meter still
needs a lot of improvements to be an actual postage meter existing in the
market. The following are the improvements we had in our mind, which we could
not do due to lack of time:
We were planning to use infra-red sensors to
detect jamming at all times. The sensors could sense the movement of the
envelope and in case it was stopped in the middle of its way, the infra-red
sensor would have informed the MCU and the process would have stopped automatically
and the user would be informed. The sensors were designed to be placed after
each wheel and at the entrance and exit of the system.
The current system is only capable of putting one
type of stamp on the envelope and it can not change the stamp according to user
setting. In an actual postage meter, the user is able to set how much money to
put on the stamp, i.e. $0.34. This required to use either and ink-jet or
dot-matrix system to stamp which was out of our capability.
We were planning to write a
java/web based user interface software to charge the postage meter for certain
amount of money with credit card, so that the postage meter would have worked
only there were enough money in it. This could be done through using the serial
communication capabilities of the MCU. We were also thinking of adding the
feature of charging the postage meter through Internet.
If we had not encountered this many mechanical problems, we would try to add more features to our postage meter. We would like to warn the future designers who are planning on building such a system: it is VERY time consuming, and it needs a lot of mechanical design. If you have friends in architecture or mechanical engineering, go for it and improve our design!