{"id":150,"date":"2020-08-02T14:02:00","date_gmt":"2020-08-02T14:02:00","guid":{"rendered":"http:\/\/doctor-dark.co.uk\/blog\/2020\/08\/02\/greenhouse-computer-ravings-continued\/"},"modified":"2023-12-18T12:18:14","modified_gmt":"2023-12-18T12:18:14","slug":"greenhouse-computer-ravings-continued","status":"publish","type":"post","link":"https:\/\/doctor-dark.co.uk\/blog\/greenhouse-computer-ravings-continued\/","title":{"rendered":"Greenhouse computer ravings continued."},"content":{"rendered":"\n\n\n\n
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Fat man in the greenhouse.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
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In the end, I got fed up with the temperate readings being messed up by the Sense HAT being inside the case, and no cooling fan being able to keep its sensors cool enough. I dispensed with the Sense HAT, which I will find some other use for, and put a cheap temperature and humidity sensor on wires lead out of the case.<\/span><\/div>\n
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Having arranged a shade to keep direct sunlight off the sensor, I now get sensible readings. I missed being able to look at the greenhouse and see the temperature scroll past, so I had the computer report temperature and humidity to another Pi indoors. <\/div>\n
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Simple web site<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

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That computer runs the Apache web server, and uses the incoming readings to make a simple web page, which I can look at from my main computer…<\/div>\n

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Code…<\/span><\/div>\n

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textA = [“<!doctype html>n”,”<html lang=”en”>n”,”<head>n”,”<meta charset=”utf-8″>n”,<\/div>\n
         “<title>Greenhouse<\/title>”,”<link rel=”stylesheet” href=”mystyle.css”>”,<\/div>\n
         “<meta http-equiv=”refresh” content=”150″ >”,<\/div>\n
         “<\/head>”,”<body>”,”<h1>Greenhouse<\/h1>”,”<p>”]<\/div>\n
textZ = [“<\/body>n”,”<\/html>n”]<\/div>\n
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def update_greenhouse_website():<\/div>\n
    global previous_time, greenhouse_temp_file_modified<\/div>\n
    greenhouse_temp_file_modified = os.stat(‘\/home\/pi\/ftp\/files\/gth.txt’).st_mtime<\/div>\n
    if greenhouse_temp_file_modified == previous_time:<\/div>\n
        #print(‘Same time’)<\/div>\n
        textM = “No greenhouse data received.nCheck greenhouse computer!”<\/div>\n
    else:<\/div>\n
        #print(‘New time’)<\/div>\n
        fp = open(‘\/home\/pi\/ftp\/files\/gth.txt’, ‘r’)<\/div>\n
        textM = fp.read()<\/div>\n
        fp.close()<\/div>\n
    <\/div>\n
    fp = open(‘\/var\/www\/html\/greenhouse.html’, ‘w’)<\/div>\n
    for line in textA:<\/div>\n
        fp.write(line)<\/div>\n
    fp.write(textM)<\/div>\n
    fp.write(“n”)<\/div>\n
    for line in textZ:<\/div>\n
        fp.write(line)<\/div>\n
    fp.close()<\/div>\n
    <\/div>\n
    previous_time = greenhouse_temp_file_modified  <\/div>\n
    return<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Fat man in the greenhouse. In the end, I got fed up with the temperate readings being messed up by the Sense HAT being inside the case, and no cooling fan being able to keep its sensors cool enough. I dispensed with the Sense HAT, which I will find some other use for, and put … Continue reading “Greenhouse computer ravings continued.”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-150","post","type-post","status-publish","format-standard","hentry","category-raspberry-pi"],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/doctor-dark.co.uk\/blog\/wp-json\/wp\/v2\/posts\/150","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/doctor-dark.co.uk\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/doctor-dark.co.uk\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/doctor-dark.co.uk\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/doctor-dark.co.uk\/blog\/wp-json\/wp\/v2\/comments?post=150"}],"version-history":[{"count":1,"href":"https:\/\/doctor-dark.co.uk\/blog\/wp-json\/wp\/v2\/posts\/150\/revisions"}],"predecessor-version":[{"id":422,"href":"https:\/\/doctor-dark.co.uk\/blog\/wp-json\/wp\/v2\/posts\/150\/revisions\/422"}],"wp:attachment":[{"href":"https:\/\/doctor-dark.co.uk\/blog\/wp-json\/wp\/v2\/media?parent=150"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/doctor-dark.co.uk\/blog\/wp-json\/wp\/v2\/categories?post=150"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/doctor-dark.co.uk\/blog\/wp-json\/wp\/v2\/tags?post=150"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}