I have read AN906 and AN907 and I am a bit skeptical.  It would seem
that using PWM to drive the voltage into the winding with a current
limiting circuit would end up being very inaccurate depending on the
inductance of the winding and the frequency of the PWM.

Anyone else have thoughts on this?

Ken Pergola wrote:

>Wow, this thread sounds like Cheech and Chong have joined the PICLIST. :)
>
>Besides the numerous articles on the web with regard to stepper motors,
>Microchip just released a bunch of app notes within the last couple of days
>and weeks -- two of them on stepper motors:
>
>AN907 Stepping Motors Fundamentals 02/23/2004
>AN906 Stepper Motor Control Using the PIC16F684 02/23/2004
>
>1) Go to Microchip's web site
>2) Click on  All Application Notes
>3) Sort descending (newest first)
>
>AN910 PICmicro Device Programming: What You Always Wanted to Know (But Didn'
>t Know Who to Ask) 02/25/2004
>AN737 Using Digital Potentiometers to Design Low Pass Adjustable Filters
>02/24/2004
>TB075 Clearing the Software Write-Protect Feature on the 24LCS52 02/23/2004
>AN909 SPI Communications Between Serial EEPROMs and PICmicro
>Microcontrollers 02/23/2004
>AN907 Stepping Motors Fundamentals 02/23/2004
>AN906 Stepper Motor Control Using the PIC16F684 02/23/2004
>AN905 Brushed DC Motor Fundamentals 02/23/2004
>AN903 8K and 16K Microwire EEPROM Enhancements 02/11/2004
>AN897 Thermistor Temperature Sensing with MCP6S2X PGA 02/11/2004
>
>
>Best regards,
>
>Ken Pergola
>
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>
>

--

Thanks,

Scott Thomas

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