1、基于 Arduino ethernet shield与 18B20的温度记录仪wxxmickey 发表于 - 2010-1-2 18:15:000推 荐全文摘自：http:/ temperature data loggerAn arduino, a DB18S20 one-wire temperature sensor and an LDR (Light Dependent Resistor) are hooked up with some resistors and an ethernet shield to make a datalogger and webmonitor.Notes :
2、for this setup the connections are made on the ethernet shield instead of directly on the arduino. Since Fritzing misses a library with external shield I used the arduino, the pinout stays the same either way. check the DS18B20 datasheet for the specifications on hooking up the sensor in parasite or
3、 powered mode Schematics :arduino读取传感器温度每十秒一次并把温度数据上传到网站上，并以 TXT文件存储 随后将数据制成折线图 reads the sensors every 10 seconds and passes the data to a php on your website; which then stores the data in a text file. A second generates a line chart of the collected data.22 hours of temperature dataI started from
4、 Cyberspices code and changed the arduino code to make use of the DB18S20 and the ethernet shield.A一个变量加入了上传的 php用于除温度外还存储光的强度 variable was added to the upload php in order to store the light intensity in addition to the temperature.图表还显示了最低温度最高温度平均温度当前温度The graphing was altered to also display the
5、minimum temperature, the maximum temperature, the current temperature and the average temperature. A raster was added for a better interpretation of the plotted data and a green line is showing the average temperature troughout the chart.你需要改成自己的 IPYou need to alter your ip, domain and path as I exp
6、lained in the post Arduino Wireless motion detector so I wont go into those details here.The arduino sketch :include include include int count = 0;OneWire ds(8);int HighByte, LowByte, TReading, SignBit, Tc_100, Tf_100, Whole, Fract;int Tcount = 1;int W6;int F6;int photocellPin = 0; / the cell and 10
7、K pulldown are connected to a0int light; / the analog reading from the sensor dividerbyte mac = 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED ;byte ip = 192, 168, 1, 36;byte server = 77, 222, 78, 32;/ String bufferchar buffer256;Client client(server, 80);void setup()Ethernet.begin(mac, ip);Serial.begin(9600);d
8、elay(1000);/ Serial.println(“connecting.“);void loop()byte i;byte present = 0;byte data12;byte addr8;if ( !ds.search(addr) ds.reset_search();return;ds.reset();ds.select(addr);ds.write(0x44,1); / start conversion, with parasite power on at the enddelay(1000); present = ds.reset();ds.select(addr);ds.w
9、rite(0xBE); / Read Scratchpad读取中间结果寄存器light = analogRead(photocellPin);/读取光强数据Serial.print(“light intensity = “);Serial.print(light);Serial.print(“n“);for ( i = 0; i The graphing tempgraph.php :画图的 PHP文件代码$datapointtemperature ?$maxtemp : $datapointtemperature;$avgtemp += $datapointtemperature;$curt
10、emp = $datapointtemperature;$avgtemp = round($avgtemp / $datapoints),2);/ Get the axis dimensions. Round up and down to the nearest/ degree C and hour.$lowtime = intval($mintime / 3600) * 3600;$hightime = (intval($maxtime / 3600) + 1) * 3600;$difftime = $hightime - $lowtime;$lowtemp = intval($mintem
11、p);$hightemp = intval($maxtemp) + 1;$difftemp = $hightemp - $lowtemp;/ Create the image$image = imagecreate(WIDTH, HEIGHT);if ($image) $background = imagecolorallocate($image, 255, 255, 255);$black = imagecolorallocate($image, 0, 0, 0);$red = imagecolorallocate($image, 255, 0, 0);$blue = imagecolora
12、llocate($image, 0, 0, 255);$green = imagecolorallocate($image, 0, 204, 5);$grey = imagecolorallocate($image, 210,210,210);/ Draw the axesimageline($image, 20, 20, 20, 485, $black);imageline($image, 15, 480, 980, 480, $black);imageline($image, 15, 20, 20, 20, $black);imageline($image, 980, 480, 980,
13、485, $black);/ Draw top horizontal lineimageline($image, 20, 20, 980, 20, $grey);/ Draw right most vertical lineimageline($image, 980, 20, 980, 479, $grey);for ($i = 3600; $i I will soon post some improvements on the s : averaging 6 readings ( 1 minute ) to 1 datapoint to get rid of the noise let the fill one text file for each day, so you can look at a history over several days split up data into different charts last but not least, trying to add the S65 in the game : showing the current sensor readings or a graph Please leave a comment or send me a link to show your arduino projects!
