nodemcu+dht22测温度

howhot_init.lua

function getdht()
    status, temp, humi, temp_dec, humi_dec = dht.read(4)
    if status == dht.OK then
        print("temperature=" .. (temp) .. ", humidity=" .. (humi) .. "")
        -- send message
        msg = "温度" .. (temp) .. ",湿度" .. (humi) .. ""
    elseif status == dht.ERROR_CHECKSUM then
        print("DHT Checksum error.")
    elseif status == dht.ERROR_TIMEOUT then
        print("DHT timed out.")
        msg = "DHT timed out."
    end
    return msg
end
local function sendprint(conn, data, callback)
    print("sending: "..data.."")
    conn:send(data, callback)
end

function run()
    srv = net.createServer(net.TCP, 30)
    srv:listen(80, function(conn)
        conn:on("receive", function(conn, payload)
            print(payload)
            data = "HTTP/1.0 200 OK\r\nServer: NodeMCU on ESP8266\r\nContent-Type: text/html\r\n\r\n"..getdht() .. "\r\n"
            sendprint(conn, data, function()
                conn:close()
            end)
        end)
    end)
    
end

function connect()
    print("Connecting to WiFi access point...")
    wifi.setmode(wifi.STATION)
    wifi_cfg = {}
    wifi_cfg.ssid = "ssid"
    wifi_cfg.pwd = "password"
    wifi_cfg.save = false
    wifi.sta.config(wifi_cfg)
    tmr.create():alarm(1000, tmr.ALARM_AUTO, function(cb_timer)
        if wifi.sta.getip() == nil then
            print ("Waiting for IP address..")
        else
            cb_timer:unregister()
            print ("WiFi mode: ", wifi.getmode ())
            print ("MAC address: ", wifi.ap.getmac ())
            print("Chip ID: ", node.chipid())
            print("Heap Size: ", node.heap(), '\n')
            print ("IP address: ", wifi.sta.getip ())
            print ("Configuration done")
            run()
        end
    end)
end

print("You have 3 seconds to abort\nWaiting...")
tmr.create():alarm(3000, tmr.ALARM_SINGLE, connect)

wifi.eventmon.register(wifi.eventmon.STA_CONNECTED, function(T)
    print("\n\tSTA - CONNECTED" .. "\n\tSSID: "..T.SSID.."\n\tBSSID: " ..
    T.BSSID.."\n\tChannel: "..T.channel)
end)

wifi.eventmon.register(wifi.eventmon.STA_DISCONNECTED, function(T)
    print("\n\tSTA - DISCONNECTED" .. "\n\tSSID: "..T.SSID.."\n\tBSSID: " ..
    T.BSSID.."\n\treason: "..T.reason)
end)

wifi.eventmon.register(wifi.eventmon.STA_GOT_IP, function(T)
    print("\n\tSTA - GOT IP" .. "\n\tStation IP: "..T.IP.."\n\tSubnet mask: " ..
    T.netmask.."\n\tGateway IP: "..T.gateway)
end)