Digital pot?
http://www.microchip.com/wwwproducts/Devices.aspx?product=3DMCP41010

http://www.microchip.com/paramchartsearch/chart.aspx?branchid=3D11026&mid=
=3D11&lang=3Den&pageid=3D79&redirects=3Ddigipots





-----Original Message-----
>From: Tobias Gogolin <usertogo@gmail.com>
>Sent: May 27, 2015 7:49 AM
>To: "Microcontroller discussion list - Public." <piclist@mit.edu>
>Subject: [EE] Help with XL6009 based MPPT
>
>Hello E-Wizards
>As ai mentioned in another post I am experimenting on a MPPT charge
>controller circuit for my Solar Muscle Electric Race Trike...
>
>I am using an Arduino Nano (328) MCU and a cheap XL6009 based DC-DC
>boost converter. Soon when those ASC712 current sensor modules arrive
>I will try to maximize the output current of the XL6009 module by
>varying the adjustment of the feedback...
>
>And exactly that is the issue! The feedback pin is based on a 1.25
>Volt threshold reference, with extreme amplification so normally a
>simple voltage divider from the output gets  to cause a 'stabilized'
>voltage. Now I managed to create a filtered controllable DC via the
>PWM function of the Nano, and via a resistor influence that divider on
>feedback, but I can only influence so much (right now I can achieve
>close to 3V output regulation, before the actual feedback function
>becomes unstable and I get unwanted output swings...
>
>So what I am looking for is some kind of linear potentiometer like
>circuit I can control from my PWM filtered DC?
>
>Any hints highly appreciated
>
>Cheers
>
>Tobias
>
>
>--=20
>Tobias Gogolin
>Tel. D1 (49) 0151 5187 5210
>Tel. D2 (49) 0152 0839 5060
>skype: moontogo
>--=20
>http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
>View/change your membership options at
>http://mailman.mit.edu/mailman/listinfo/piclist
--=20
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.