/challenges-projects/design-challenges/energy-harvesting/b/blog/posts/wall-energy-harvesting-trialsI have started my energy harvesting trials to power up the carbon monoxide detector from the difference between ambient and wall temperature. Firstly, I checked these differences in some long periods of time in couple of rooms at home. I tested both en-USTelligent Community 12https://community.element14.com/challenges-projects/design-challenges/energy-harvesting/b/blog/posts/wall-energy-harvesting-trialsSun, 05 May 2013 19:40:36 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:d3e1fa49-0c44-486f-9140-2d882a72ad17DAB1<p>Interesting test.</p><p>&nbsp;</p><p>I suspect that the difference in temperature between the wall and the air might just be a matter of the vast difference between the ability of the wall and the air to retain heat.</p><p>&nbsp;</p><p>The only place I can think of with a fairly large temperature difference would be you cold water tap.&nbsp; Most city supplied water is in the 40 degree F. range, though it might be in the 55 to 60 degree range depending upon the time of year.</p><p>&nbsp;</p><p>Either way, you need to find a way to dissipate the heat between the source and the environment.</p><p>&nbsp;</p><p>Thanks, </p><p>DAB</p><img src="https://community.element14.com/aggbug?PostID=15757&AppID=106&AppType=Weblog&ContentType=0" width="1" height="1">