hello do you know if I can find an I2C circuit to interface a 16 pads (4 rows,4 colums) DTMF keyboard without sending any code ? (as I do using a PCF 8574 today) thanks for your help F1CHF -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist