In case you are a nut case and want everything monitored and under control, as I do, you NEED a temperature and humidity monitoring device that is at least semi-reliable, throwable, checkable, cheap and ugly as fuck. <\/p>\n\n\n\n
Also, the results can be seen here: https:\/\/bastart.spoton.cz\/temphumi\/<\/a> and especially, the graphing for battery state (3rd graph from top): https:\/\/bastart.spoton.cz\/status\/ <\/a><\/p>\n\n\n\n Search no more, as you have found it, read on and relive the ecstatic feelings of designing an ass-ripping ultra portable ESP8266 powered temperhumi meter for a couple [f|b]ucks. <\/p>\n\n\n\n\n\n\n\n When it comes to hardware selection, it was an obvious choice. What better a device to find than an ESP8266-12F in it’s all bare guts sticking out. The DHT11 is very inprecise, but cheap and easy to work with. Also, with every unit manufactured – a polar bear dies. Go get ’em. For the other stuff, a few capacitors, some resistors etc… <\/p>\n\n\n\n Heck, I shall put a list of all that shit for this MOFO project just here:<\/p>\n\n\n\n As nobody cares about the hardware part, let’s look at the software part. My choice of language to fit this non-demanding and stupidly ugly project – YEAH! Python. Micro Python that is, as this small thing runs on these small things (i.e. uPython runs on ESP8266). No interrupts, no memory allocations, nothing of the stuff that grown-ups do with microprocessors.<\/p>\n\n\n\n Alright, alright, you expect a chunk of code, copy paste it and move on. Well, here you go then. **slab**<\/p>\n\n\n\n So you want a better guide to the hardware part, eh? Wait for it and hold my beer…<\/p>\n\n\n\n You might want to read a couple articles first. namely http:\/\/wp.spoton.cz\/2017\/11\/21\/bricking-and-flashing-esp-01s-8266\/<\/a> to see how to flash an ESP and http:\/\/wp.spoton.cz\/2017\/11\/29\/micropython-on-esp-01-8266\/<\/a> on how to setup micropython on an ESP.<\/p>\n","protected":false},"excerpt":{"rendered":" In case you are a nut case and want everything monitored and under control, as I do, you NEED a […]<\/p>\n","protected":false},"author":1,"featured_media":59,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[4,5,8],"tags":[15,37,40,42,65,66,90,94,99],"_links":{"self":[{"href":"https:\/\/spoton.cz\/index.php\/wp-json\/wp\/v2\/posts\/592"}],"collection":[{"href":"https:\/\/spoton.cz\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/spoton.cz\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/spoton.cz\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/spoton.cz\/index.php\/wp-json\/wp\/v2\/comments?post=592"}],"version-history":[{"count":0,"href":"https:\/\/spoton.cz\/index.php\/wp-json\/wp\/v2\/posts\/592\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/spoton.cz\/index.php\/wp-json\/wp\/v2\/media\/59"}],"wp:attachment":[{"href":"https:\/\/spoton.cz\/index.php\/wp-json\/wp\/v2\/media?parent=592"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/spoton.cz\/index.php\/wp-json\/wp\/v2\/categories?post=592"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/spoton.cz\/index.php\/wp-json\/wp\/v2\/tags?post=592"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Da parts.<\/h2>\n\n\n\n
Da code.<\/h2>\n\n\n\n
import dht\nimport machine\nimport utime\nimport urequests\nimport network\nimport json\nimport esp\nfrom flashbdev import bdev\n\n\"\"\"\nVariables\n--------------------------------------------------------------------------------\n\"\"\"\n# Do we want to measure internal or external? VCC \/ ADC\nADC_MODE_VCC = 255\nADC_MODE_ADC = 0\n# Network credentials pulled from inet.conf residing on the FS\n# options check\npossible_opts = ['ssid', 'pass', 'ip', 'netmask', 'gw', 'destination', 'dns']\n# Let's set location, will be set as a tag in influx\n_LOCATION_TYPE = \"Tea\"\n# INFLUX config - can be part of the config file, no?\n_INFLUX_HOST = '192.168.8.15' \n_INFLUX_PORT = '8086'\n_INFLUX_DB = 'indb'\n_INFLUX_USER = 'pi'\n_INFLUX_PASS = 'password'\n\n\n\"\"\"\nFunctions\n--------------------------------------------------------------------------------\n\"\"\"\n\ndef set_adc_mode(mode):\n # Switch between internal and external ADC. Returns if restart is needed\n # Mode up in variables\n sector_size = bdev.SEC_SIZE\n flash_size = esp.flash_size() # device dependent\n init_sector = int(flash_size \/ sector_size - 4)\n data = bytearray(esp.flash_read(init_sector * sector_size, sector_size))\n if data[107] == mode:\n # flash is already correct; nothing to do\n return False\n else:\n data[107] = mode # re-write flash\n esp.flash_erase(init_sector)\n esp.flash_write(init_sector * sector_size, data)\n print(\"ADC mode changed in flash; restart to use it!\")\n return True\n\ndef check_wake_state():\n # check if the device woke from a deep sleep\n if machine.reset_cause() == machine.DEEPSLEEP_RESET:\n print('woke from a deep sleep')\n else:\n print(machine.reset_cause())\n utime.sleep_ms(10)\n\ndef deep_sleep(sleep_minutes):\n sleep_ms = sleep_minutes * 60 * 1000\n rtc = machine.RTC()\n rtc.irq(trigger=rtc.ALARM0, wake=machine.DEEPSLEEP)\n rtc.alarm(rtc.ALARM0, sleep_ms)\n machine.deepsleep()\n\ndef read_network_config():\n config_dict = {}\n try:\n with open('inet.conf', 'r') as conf_handler:\n config = conf_handler.readlines()\n for item in config:\n tmp_list = item.split(\"=\")\n option = tmp_list[0].strip()\n if len(tmp_list) == 2 and option in possible_opts:\n value = tmp_list[1].strip()\n config_dict.update({option: value})\n else:\n pass\n except Exception as e:\n print(\"WARNING: Errors in INFRA config, still going for AP\")\n return False\n print(config_dict)\n return config_dict\n\ndef set_up_infra(_SSID, _PASS, _TIMEOUT):\n sta = network.WLAN(network.STA_IF)\n ap = network.WLAN(network.AP_IF)\n print(\"Disabling AP\")\n ap.active(False)\n print(\"Activating INFRA\")\n sta.active(True)\n sta.isconnected() # False, it should be # Comments by Yoda\n print(\"Connecting to infra\")\n sta.connect(_SSID, _PASS)\n connection_tout = _TIMEOUT\n print(\"Let's wait for the network to come up\") # Hopefully not indefinitely\n # That's why we have a nice timeout, so it does not drain the batt on con\n while not (sta.isconnected()):\n if connection_tout > 0:\n print(\"Trying... {} more times\".format(connection_tout))\n utime.sleep_ms(500)\n connection_tout = connection_tout - 1\n else:\n print(\"Out of retrys while waiting for network, going to sleep\")\n utime.sleep_ms(500)\n return False\n network_config = sta.ifconfig()\n return network_config\n\n\"\"\"\nNetwork configuration section\n--------------------------------------------------------------------------------\n\"\"\"\ntry:\n net_config = read_network_config()\n if net_config:\n net_conf_result = set_up_infra(net_config[\"ssid\"],\n net_config[\"pass\"],\n 10)\n else:\n print(\"ERROR: cannot read from inet.conf file\")\n utime.sleep_ms(100)\n if net_conf_result:\n print(\"Connected:\")\n print(\" IP: {}\".format(net_conf_result[0]))\n print(\" MASK: {}\".format(net_conf_result[1]))\n print(\" GW: {}\".format(net_conf_result[2]))\n print(\" DNS: {}\\n\".format(net_conf_result[3]))\n else:\n print(\"WARNING: Network config not done\")\nexcept Exception as e:\n print(\"ERROR: Network configuration failed with: {}\".format(e))\nprint(\"Network section done\")\n\n\"\"\"\nMeasure temperhumi\n--------------------------------------------------------------------------------\n\"\"\"\nprint(\"getting the temperature here\")\nd1 = machine.Pin(5, machine.Pin.IN)\ntry:\n local_dht = dht.DHT11(d1)\n local_dht.measure()\n temperature = local_dht.temperature()\n humidity = local_dht.humidity()\n print(\"T: {}\".format(temperature))\n print(\"H: {}\".format(humidity))\nexcept Exception as e:\n print(\"ERROR: Temp measurement: {}\".format(e))\n temperature = 255\n humidity = 255\n\n\"\"\"\nMeasure battery\n--------------------------------------------------------------------------------\n\"\"\"\nprint(\"Setting ADC mode here\")\nset_adc_mode(ADC_MODE_VCC)\nvcc = machine.ADC(1)\nval = vcc.read()\nutime.sleep(2)\nbattery = vcc.read()\n\n\n\"\"\"\nData send\n--------------------------------------------------------------------------------\n\"\"\"\nif net_conf_result:\n post_str = \"http:\/\/{}:{}\/write?db={}&u={}&p={}\"\n post = post_str.format(_INFLUX_HOST,\n _INFLUX_PORT, \n _INFLUX_DB,\n _INFLUX_USER,\n _INFLUX_PASS)\n data_str = \"usense,type={_type} humidity={_humi} \\n \" + \\\n \"usense,type={_type} temperature={_temp}\\n \" + \\\n \"usense,type={_type} battery={_batt}\"\n data = data_str.format(_type=_LOCATION_TYPE,\n _humi=humidity,\n _temp=temperature,\n _batt=battery)\n print(data)\n try:\n result = urequests.post(post, data=data)\n except Exception as e:\n print(\"ERROR: Data send 'urequest': {}\".format(e))\n # Go to sleep, cause why the fuck not\n deep_sleep(28)\n print(result.text)\nelse:\n print(\"WARNING: Not sending data, as infra is not available\")\n# Sleep, deep. You earned it\ndeep_sleep(28)\n<\/pre>\n\n\n\nHow to put it together<\/h2>\n\n\n\n