Pages: [1]   Go Down
Author Topic: analog outputs  (Read 3215 times)
0 Members and 1 Guest are viewing this topic.
Offline Offline
Newbie
*
Karma: 0
Posts: 1
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Hello,

I'm looking to produce a wave form with the arduino.
DC + AC with variable frequency, 0-10V - real analog and not PWM.

is there any arduino that enables this feature without addtional HW?
Logged

Global Moderator
UK
Offline Offline
Brattain Member
*****
Karma: 238
Posts: 24370
I don't think you connected the grounds, Dave.
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

No.

But the additional hardware can be really simple.

(You didn't mention frequency. Very important.)
« Last Edit: September 10, 2012, 08:31:36 am by AWOL » Logged

"Pete, it's a fool looks for logic in the chambers of the human heart." Ulysses Everett McGill.
Do not send technical questions via personal messaging - they will be ignored.

Offline Offline
Newbie
*
Karma: 0
Posts: 9
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

without HW, the answer ,as far as I know, is NO.

but for DC, you can use simple LPF (i.e., RC) to generate DC from PWM.
for AC, you can also play around LPF and PWM; however, I guess, freq. will be limited > several KHz (If you are not using 490Hz default PWM), also the  wave form look rather saw tooth...

A clever summing network might be needed to add two signals.

Nahoona
Logged

0
Offline Offline
Shannon Member
****
Karma: 161
Posts: 10442
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Really need to know frequency requirements, signal/noise ratio desired, resolution of output, waveforms desired, accuracy requirement, drive requirements (output impedance)...   Extra hardware is necessary, at least an external DAC and opamp amplification to 10V.  Not that simple, but certainly doable for low frequencies (audio range?).
Logged

[ I won't respond to messages, use the forum please ]

Brighton, UK
Offline Offline
Newbie
*
Karma: 0
Posts: 47
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

The recently-released Arduino Due has DACs / analog output.  You'd probably need some external level shifting / amplification as well, e.g. one op-amp.

Jim
Logged

Pages: [1]   Go Up
Jump to: