ndeepak Posted March 3, 2008 Report Share Posted March 3, 2008 hello, i m using 16f73 for my x-y table and position is sensed with linear potentiometer. now to drive dc motor to control speed i need D/A converter without loosing much (eight) pins. is it posssible to use A/D somehow to get D/A ? deepak Link to comment Share on other sites More sharing options...
Carl Posted March 6, 2008 Report Share Posted March 6, 2008 you can get serial a/d converters have a look at analogue devices Link to comment Share on other sites More sharing options...
marke Posted March 7, 2008 Report Share Posted March 7, 2008 Hello ndeepak No, you can not use the A/D converter as a D/A converter The 16f73 does have two PWM modules which can be used to give you an analog output. The output voltage is controlled by the pulse width. Zero pulse width gives you zero output and 100% pulse width gives you the supply voltage output. You will need to pass the pulses through a low pass filter to get "DC". The lower the cutoff frequency, the lower the ripple and the slower the response time. Best regards, Mark Empson | administratorSkype Contact = markempson | phone +64 274 363 067LMPForum | Power Factor | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | Pressure Transducers | Smart Relay | GSM Control | Mark Empson Website | AuCom | Soft Starters Link to comment Share on other sites More sharing options...
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