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[on:]

i am doing this same project (without the piggy bank), i have a 2 part question..

1.) if i do use a power supply, how do i hook up battery pack in-case there is a power outage to remain working?

2.) how do i save the data (what has already been counted) if say battery dies and or power loss with out a battery supply?

basically i just want to save the dollar amount in-case i lose power regardless of how i have this powered... so when it's powered up, the dollar amount was not lost and remains intact to continue on counting/adding to the dollar amount.

thanks in advance,
Ruffsta

[Reply #1 on:]

2.) how do i save the data (what has already been counted) if say battery dies and or power loss with out a battery supply?

Use EEPROM: http://arduino.cc/en/Reference/EEPROM

[Reply #2 on:]

ty

The EEPROM memory has a specified life of 100,000 write/erase cycles, so you may need to be careful about how often you write to it.

that's gonna suck if it writes every time a coin is added.. i doubt it can tell when there's power loss for it to write only then..

[Reply #3 on:]

k, now how would go about doing this without arduino.. i wouldn't know what to put on a pref board other than an lcd and power supply..