Is there a Picaxe with a reasonable resolution DAC ?

[pjrebordao]

By reasonable, I mean at least 8bits...
I think I'll have to resort to an external DAC, but just to be sure.

 

[erco]

AFAIK it's only 5 bit resolution (32 equal steps) and I just noticed that on the M2 series, only the 18M2 has a DAC output which is NOT the serial output pin.

 

[Reloadron]

Just about any PICAXE will give 8 bit resolution and there is always the:
Name:
readadc10
Syntax:

READADC10 channel,wordvariable

So just about any PICAXE will give you 8 bit and using the above will get you 10 bit on some chips. What did you have in mind?

Ron

 

[Buzby]

Ron, it's DAC, not ADC.

 

[westaust55]

For external DACs (Digital to Analog COnverters) you may find the information I posted here useful
http://www.picaxeforum.co.uk/showthread.php?14686-Digital-to-Analog-Converters-101

@Reloadron,
pjrebordao is enquiring about DAC not ADC capabilities

 

[rq3]

By reasonable, I mean at least 8bits...
I think I'll have to resort to an external DAC, but just to be sure.

A PWM output into a simple low pass filter will give you 10 bits, if the load current is small enough.
Can you provide more details? What's the DAC output ultimately going to do?

Rip

 

[Reloadron]

Many thanks for pointing out the error of my ways. I refuse to believe I clearly read "DAC" as ADC, however, I obviously did manage to do that. I have not even had a hard cider yet this evening. May as well start now and just think, for over 40 years I managed to earn a living in electronics, now I have doubts about spelling it correctly.

Thanks Guys
Ron

 

[erco]

A PWM output into a simple low pass filter will give you 10 bits, if the load current is small enough.

Yup, I got 8 bits easily just using PWM. Very linear output from my experiments: https://www.youtube.com/watch?v=xuBiSvVDgV8

I was initially planning to use DAC for this until I discovered the resolution was only 5 bits and it needed my 08M2's serial out pin.