Other Devices

The money box monitors requires a few additional devices to work:

• a microswitch to detect presence of coin container;
• a microswitch to detect if door is closed properly;
• a pushbutton to reset amount;
• a passive buzzer to provide acoustic feedback;

Connections

Arduino Pin	Function
A0	coin container microswitch
A1	amount reset pushbutton
A2	door microswitch
D3	passive buzzer

Library

Two (very) basic libraries have been developed to abstract buttons/switchs and buzzer behaviour.
Button_1.0
Beeper_1.0

(next - Appendix A: State Machine)