only allow 1 vote per day period

Since you are using the Rate module custom voting widget modify the rate-widget.tpl.php file to set the class on all widget buttons to 'voted' for a 24 hour period after one vote is cast:

<?php
// $Id: rate-widget.tpl.php,v 1.5 2010/09/27 19:39:14 mauritsl Exp $

/**
 * @file
 * Rate widget theme
 *
 * This is the default template for rate widgets. See section 3 of the README
 * file for information on theming widgets.
 */

/**
 * Check db for ip and timestamp to allow only 1 vote per 24 hours
 * mod added by decibel.places on 1/9/2011 rgoya@yahoo.com http://netsperience.org
 */
$curip = ip_address();
$result = db_query("SELECT timestamp FROM {votingapi_vote} WHERE vote_source = '$curip' ORDER BY vote_id DESC LIMIT 1");
$fetch = db_fetch_object($result);
$timeago = $fetch->timestamp;
$timenow = time();
$timespan = $timenow - $timeago;
$readytovote = 0;
if ($timespan > 86400) $readytovote = 1;

// Print all rate buttons
foreach ($links as $link) {
  if ($results['user_vote'] == $link['value'] || !$readytovote) {
    // user has voted
    $class = 'voted';
  }

you could also query for the uid, to allow authenticated users from the same IP to vote once, and uid0 is anonymous

moving this issue to Rate module issue queue

this is a feature request which goes against -dev and shouldn't be marked critical. If it was an existing feature that didn't work as described different story.

I am trying to do the same and tried the code you gave and wanted to know if you it works in current or only works in Dev. If I can help in getting this work please let me know.

Scott

If you want to restrict individual logged in users, do so here.

// $Id: rate-widget.tpl.php,v 1.5 2010/09/27 19:39:14 mauritsl Exp $

/**
* @file
* Rate widget theme
*
* This is the default template for rate widgets. See section 3 of the README
* file for information on theming widgets.
*/

/**
* Check db for ip and timestamp to allow only 1 vote per registered user per 24 hours
*
* user check added by neoliminal on 6/23/2011
*
* mod added by decibel.places on 1/9/2011 <a href="mailto:rgoya@yahoo.com" rel="nofollow">rgoya@yahoo.com</a> <a href="http://netsperience.org
* " title="http://netsperience.org
* " rel="nofollow">http://netsperience.org
* </a> 
*
*
*/

$cur_uid = $user->uid;
$result = db_query("SELECT timestamp FROM {votingapi_vote} WHERE uid = '$cur_uid' ORDER BY vote_id DESC LIMIT 1");
$fetch = db_fetch_object($result);
$timeago = $fetch->timestamp;
$timenow = time();
$timespan = $timenow - $timeago;
$readytovote = 0;
if ($timespan > 86400) $readytovote = 1;

// Print all rate buttons
foreach ($links as $link) {
  if ($cur_uid == 0) {
  // Anonymous users may not vote. 
  // Add possibly login option here.
  break 2; 
  }
  elseif ($results['user_vote'] == $link['value'] || !$readytovote) {
    // user has voted
    $class = 'voted';
  } else {
    // user has not voted
    $class = 'not-voted';
  }
  print theme('rate_button', $link['text'], $link['href'], $class);
}

print t('Total votes: !count', array('!count' => $results['count'])); 

-edit-

Found my solution here: http://drupal.org/node/1224150
----

Hi guys. Are there any modifications I can make to the above code to make it work with D7?

I believe db_fetch_object is depreciated but I'm not skilled enough to re-code for 7. Help is appreciated.

This may help: http://drupal.org/update/modules/6/7#dbtng

In d7, you use db_query() and then use a foreach loop

$result = db_query("SELECT timestamp FROM {votingapi_vote} WHERE uid = :curuid ORDER BY vote_id DESC LIMIT 1", array(':curuid' => $cur_uid));
foreach ($result as $record) {
    $timeago = $record->timestamp;
    // etc
}

Im not sure you need the foreach loop though if you only have 1 record...