14M readtemp but not readtemp12

After much success with 08M and DS18B20 I am now trying some 14M's using version 5.1.5
readtemp 4,w1 [is working fine for me I get 19 degs etc.]

readtemp12 4,w1 [always returns 0 ]

Worth mentioning the 14M firmware version.
View/Options... Firmware?
So that other can try to replicate like for like.
(sorry, I don't have a 14M to try but it works on all other breeds).

Getting a return value of 0 will happen if the wrong pin is used, an input only pin (eg pin3) or the pull-up resistor is missing.
Double check by using an absolutely basic program that uses readtemp to w0 and readtemp12 to w1 in a loop with a debug and nothing else to remove the possibility of another part of the program from corrupting any variables.


Technical Support
Staff member
PICAXE's cannot have firmware upgraded, so you would have to wait and buy a 14M which has firmware support for READTEMP12 added, or switch to another PICAXE which already does.

The deciding question is, will the 14M firmware support READTEMP12 in the future ?

A stop-gap or semi-solution would be to use your 14M to control a PICAXE-08M which did the READTEMP12 and passed the data back to the 14M.
Thanks for your help guys. I'll have to wait. I have been using 08M's and could have done with an extra output. I had already decided not to go up to 18X but saw the 14M and it was too tempting (pin for pin + extra)as it was minimal redesign of my board. As luck would have it I now have a board designed to fit a 14M but is running with a 08M in it and I've got all the must have stuff running. What's the best way of finding out when/(if) an upgrade occurs.