Input Parallel Data Into Single I/O Pin

R

rWAVE

Member
A number of approaches have been suggested in the past to input parallel data into a PICAXE (i.e. 08M) with limited I/O pins. Here is another one that recently appeared in the 10/02/08 issue of EDN Magazine (page 60) using a 74HC165 that might be useful. The article is also available online here.

Richard
 
W

westaust55

Moderator
At a first glance, seems to be suited to applications where the microcontroller will fetch a byte that must already be present in advance but not for input of data initiated by the user as there is no signal to inform the microcontroller that there is valid data to load.

More suited to the 08M where the same pin can be an input or an output under BASIC control (and IO is very limited) but think not suited to the larger PICAXE chips where most IO is predefined and a pin cannot readily (if at all with some PICAXE) be changed between being an Output to initiate data transfer and then being an input for serial data transfer.
 
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