need help to read keypad and transmit

[rigidigital]

Just working on a kind of rfid project.

Need advice on the most simple solution to read a keypad. Ive seen the post here using readac function. Are there cheap keypads($>5.00) that can be connected right out of the box onto 1 picaxe pin.

Or what do you recommend for simplicity please ? A really big picaxe with lots of pins and a standard keypad ?

 

[moxhamj]

If you had asked this a month ago people would probably have said "buy the big picaxe". But have a read of that recent post as it seems there is a very workable solution using a row of 10k resistors and one ADC pin.

Alternatively, you can interface some picaxes to a standard computer keyboard ($5 to free) - have a look at the picaxe documentation about how to do this.

Edited by - Dr_Acula on 20/08/2007 06:57:15

 

[BCJKiwi]

See the post
&quot;The ADC keypad&quot; <A href='http://www.rev-ed.co.uk/picaxe/forum/topic.asp?topic_id=7647&amp;forum_id=31&amp;Topic_Title=The+ADC+Keypad&amp;forum_title=PICAXE+Forum&amp;M=False&amp;S=True' Target=_Blank>External Web Link</a> which will take you to JonHenry's website <A href='http://www.lancer3.com/picaxe.htm' Target=_Blank>External Web Link</a>.

Check out the calculator that has all the info you need for both matrix and independent key keypads requiring only a &lt;= 5V supply and one ADC input on the PICAXE. Go direct to the calculator (MS Excel SS)<A href='http://www.lancer3.com/Files/ADC%20Keypad%20Decoder%20calculatorV3.3.zip' Target=_Blank>External Web Link</a>

BCJ

Edited by - BCJKiwi on 20/08/2007 09:12:10