DS18B20 erratic readings with 08m2

[jareid]

I have recently been experimenting with an AXE033 and a DS18B20 using an 08m displaying the temperature
with great success.
Recently I have loaded the same program into an 08M2 and experienced very erratic temperature readings on the lcd display and the display is not uploaded as it used to be with the 08m

Is there something I am missing

View attachment display tests1.bas

 

[Technical]

Full schematic plesae - are you trying to use the sensor without V+ connection (not supported)?

 

[hippy]

Perhaps try some simpler code to check if the DS18B20 is consistent ...

#Picaxe 08M2
#Terminal 4800
Do
readtemp12 2,w0
b3=w0/16
SerTxd( #b3, " " )
Loop

 

[jareid]

View attachment picaxe 08m 08m2 circuit.pdf

This is the circuit and the spurious diplays when the 18B20 are added to the circuit with an 08M2 are shown.

No problems when a 08M is used.

(I have tried it with 2x 08M2 ic and 3x DS18B20 - no difference.) All work ok when an 08M is used???

Thanks