mem modules for 08M 14M 20M

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rigidigital

Senior Member
Hi, just checking can you connect memory modules to these chips(only ones i have) to store data.?

Also will be connecting keypad and UHF modules so will need to connect I/O Expander but what would the part number for that be ?
 
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lanternfish

Senior Member
What type of "memory module". If you mean i2c, then no!

Keypad can be done a number of ways. Even matrix type can be connected using the ADC input(s)

And what type of UHF module? Most of these only require serial in/out, so can be interfaced to all the above.

Maybe you could provide a bit more info on your project and/or search the forum for similar threads.

Cheers
 
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westaust55

Moderator
Nothwithstanding the prioor posts, here are some further thoughts.

Since with the "M" series PICAXE, you do not have inbuilt i2c comms, consider:
1. 74HC165 as input expander
2. 74HC595 as output expander

Each type of chip, they can be cascaded for multiples of 8 inputs or outputs without requiring addiitonal control pins.

You can have common latch and clock pulse signals then use one PICAXE input for the input data signal and a second as the output signal.

So in theory, as a mininum for many IO in total requires just 4 PICAXE pins.
Better however, if you use 5 PICAXE IO, then you can split the input group and the output group for latching signals.
 
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