Hi, I have to start a project. I have to install 9 buttons and i need to store (maybe in an sd card) the times the buttons were pressed within a certain lapse of time,and check the data stored without a computer( lcd?). As say in the object i need to know what to buy... Can i might have some advice?
One of these would be a reasonable start: https://learn.adafruit.com/adafruit-data-logger-shield
This has the real time clock and SD card slot and there are good tutorials about making it go,
Read about dealing with your 9 input buttons here: http://playground.arduino.cc/Code/Keypad
And the base Arduino can be an UNO. http://store.arduino.cc/product/A000066
Thanks for the answer. I wanted to know if it's possible to check the data with an lcd screen
There are hundreds of LCDs that can be used with this library: http://arduino.cc/en/Tutorial/LiquidCrystal
This should get you started:
showing it on a basic lcd display also no problem with an arduino (if you mean an lcd screen, like a normal computer screen, that's something else and is not a good idea to do with an arduino) there are plenty of lcd libraries fro driving small lcd screens that you can find pretty cheap :). btw, why the need for an sd card? if it's just storing how often a few buttons get pressed, then you've got plenty of room in the arduino memory, that requires next to no memory. With the datalogger shield and an sd card you can of course log individual presses with a timestamp so you can also see when the buttons were pressed, but i don't have the impression that you need that.
Thanks again. I need that every time i turn the ardino on the lcd screen tells me how many time the buttons were pressed (only if they were keep pressed for a certain lapse of time)
kimonno: Thanks again. I need that every time i turn the ardino on the lcd screen tells me how many time the buttons were pressed (only if they were keep pressed for a certain lapse of time)
then just the arduino and an lcd screen should suffice (and the required electronics to hook it all up to eachother). there's no need to log to an sd card if it's just a few numbers you need to keep track of. If you want protection against power outages, it could even store the data on the eeprom so it doesn't get erased when there is a power loss. 1Kb of eeprom is plenty for just storing how often 9 buttons were pushed.