{"id":236,"date":"2017-02-04T19:44:23","date_gmt":"2017-02-04T23:44:23","guid":{"rendered":"http:\/\/knek-tek.me\/?p=236"},"modified":"2017-02-04T19:46:26","modified_gmt":"2017-02-04T23:46:26","slug":"solar-powered-web-server","status":"publish","type":"post","link":"http:\/\/knek-tek.me\/index.php\/2017\/02\/04\/solar-powered-web-server\/","title":{"rendered":"Solar powered web server"},"content":{"rendered":"
\"\"<\/a>

ESP8266 Thing Dev board, LTC3588 energy harvesting development board, and a 1\/2W solar panel. The three small square breakout boards on the breadboard are not being used in this pic, they’re just leftovers from another project!<\/p><\/div>\n

Using a small 6-7V, 0.5W solar panel, the LTC3588-1 energy harvesting chip<\/a>, and the ESP8266 Thing Dev board<\/a>, I created a small solar powered web server. This is a very simple demonstration circuit to prove a concept for another project I’m doing but the idea is pretty fun. This solar panel in bright sunlight can produce 75mA at 7V, which the LTC3588-1 then bucks down to 3.3V and stores that energy on an array of capacitors. With 1F of capacitance, I was able to turn on the ESP8266 Thing Dev microcontroller and provide a wifi access point and a web page for about 15 seconds every 5 minutes. If I can get up to about 4F of capacitance I think it will be much more useful for taking some quick sensor readings (using the HIH-6130<\/a> board shown on that breadboard) and then sending it to a server, or possibly the Phant.io<\/a> service.<\/p>\n

The software side of this was easy since I could just use a webserver example program provided with the Arduino library for the ESP8266 Thing Dev. Thanks Sparkfun and the ESP8266 community!<\/p>\n","protected":false},"excerpt":{"rendered":"

Using a small 6-7V, 0.5W solar panel, the LTC3588-1 energy harvesting chip, and the ESP8266 Thing Dev board, I created a small solar powered web server. This is a very simple demonstration circuit to prove a concept for another project I’m doing but the idea is pretty fun. This solar panel in bright sunlight can Continue Reading<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[25,20,29,24,19],"tags":[],"class_list":["post-236","post","type-post","status-publish","format-standard","hentry","category-hardware","category-internet","category-sensors","category-software","category-web"],"_links":{"self":[{"href":"http:\/\/knek-tek.me\/index.php\/wp-json\/wp\/v2\/posts\/236","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/knek-tek.me\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/knek-tek.me\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/knek-tek.me\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/knek-tek.me\/index.php\/wp-json\/wp\/v2\/comments?post=236"}],"version-history":[{"count":4,"href":"http:\/\/knek-tek.me\/index.php\/wp-json\/wp\/v2\/posts\/236\/revisions"}],"predecessor-version":[{"id":241,"href":"http:\/\/knek-tek.me\/index.php\/wp-json\/wp\/v2\/posts\/236\/revisions\/241"}],"wp:attachment":[{"href":"http:\/\/knek-tek.me\/index.php\/wp-json\/wp\/v2\/media?parent=236"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/knek-tek.me\/index.php\/wp-json\/wp\/v2\/categories?post=236"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/knek-tek.me\/index.php\/wp-json\/wp\/v2\/tags?post=236"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}