<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Jun 18, 2016, at 8:22 AM, Eric S. Raymond <<a href="mailto:esr@thyrsus.com" class="">esr@thyrsus.com</a>> wrote:</div><div class=""><div class=""><br class="">(Memo to self: Aaarrggh! Get heatsinks for all machines!)<br class=""><br class=""></div></div></blockquote></div><br class=""><div class="">This really isn’t needed. Design limits are 70C on the low end (<a href="https://www.raspberrypi.org/help/faqs/#performanceOperatingTemperature" class="">Raspberry Pi FAQs - Frequently Asked Questions</a>). </div><div class=""><br class=""></div><div class="">I’ve had a Raspberry Pi (B, B+, 2 & 3) outside on our deck porch, in a fully enclosed case, no air flow, in 95F+, and internal temperature was fine when compiling software for Gentoo, with the load > number of cores. Working the GPU, with video out or using the camera interface for H.264 encoding added a more heat, but it was still well within design limits.</div><div class=""><br class=""></div><div class="">Temperature can officially be monitored with this command:</div><div class="">`<span style="color: rgb(51, 51, 51); font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 13px; background-color: rgb(250, 250, 250);" class="">/opt/vc/bin/vcgencmd measure_temp</span>`</div><div class=""><br class=""></div><div class="">Or more simply, divide `<span style="font-family: Menlo; font-size: 11px;" class="">cat /sys/class/thermal/thermal_zone0/temp</span>` by 1000 for the temperature in celsius.</div><div class=""><br class=""></div><div class=""><br class=""></div></body></html>