Detailnya silahkan lihat video diatas
Dan untuk diindonesia karena menggunakan Freq 920-923 kira kira panjang antena yang digunakan adalah sekitar 7,79 – 7,81 cm
Happy Coding
Salam Ngoprek
This is some sketch for B-L072Z-LRWAN1 a.k.a STM32L0 Discovery kit LoRa, Sigfox, low-power wireless from ST, This Discovery kit features the all-in-one CMWX1ZZABZ-091 open module by Murata.
This is some sample arduoino sketch you can open my github here
Happy Coding
Salam ngoprek
function Decode( fPort, bytes )
{
// Functions
function parseCoordinate( raw_value, coordinate )
{
// This function parses a coordinate payload part into
// dmm and ddd
var raw_itude = raw_value;
var temp = "";
// Degree section
var itude_string = ( (raw_itude >> 28) & 0xF ).toString( );
raw_itude <<= 4;
itude_string += ( (raw_itude >> 28) & 0xF ).toString( );
raw_itude <<= 4;
coordinate.degrees += itude_string;
itude_string += "°";
// Minute section
temp = ( (raw_itude >> 28) & 0xF ).toString( );
raw_itude <<= 4;
temp += ( (raw_itude >> 28) & 0xF ).toString( );
raw_itude <<= 4;
itude_string += temp;
itude_string += ".";
coordinate.minutes += temp;
// Decimal section
temp = ( (raw_itude >> 28) & 0xF ).toString( );
raw_itude <<= 4;
temp += ( (raw_itude >> 28) & 0xF ).toString( );
raw_itude <<= 4;
itude_string += temp;
coordinate.minutes += ".";
coordinate.minutes += temp;
return itude_string;
}
function parseLatitude( raw_latitude, coordinate )
{
var latitude = parseCoordinate( raw_latitude, coordinate );
latitude += ((raw_latitude & 0xF0) >> 4).toString( );
coordinate.minutes += ((raw_latitude & 0xF0) >> 4).toString( );
return latitude;
}
function parseLongitude( raw_longitude, coordinate )
{
var longitude = ( ((raw_longitude >> 28) & 0xF ) ).toString( );
coordinate.degrees = longitude;
longitude += parseCoordinate( raw_longitude << 4, coordinate );
return longitude;
}
function addField( field_no, payload )
{
switch( field_no )
{
// Presence of temperature information
case 0:
payload.temperature = bytes[bytes_pos_] & 0x7F;
// Temperature is negative
if( (bytes[bytes_pos_] & 0x80) > 0 )
{
payload.temperature -= 128;
}
bytes_pos_++;
break;
// Transmission triggered by the accelerometer
case 1:
payload.trigger = "accelerometer";
break;
// Transmission triggered by pressing pushbutton 1
case 2:
payload.trigger = "pushbutton";
break;
// Presence of GPS information
case 3:
// GPS Latitude
// An object is needed to handle and parse coordinates into ddd notation
var coordinate = {};
coordinate.degrees = "";
coordinate.minutes = "";
var raw_value = 0;
raw_value |= bytes[bytes_pos_++] << 24;
raw_value |= bytes[bytes_pos_++] << 16;
raw_value |= bytes[bytes_pos_++] << 8;
raw_value |= bytes[bytes_pos_++];
payload.lati_hemisphere = (raw_value & 1) == 1 ? "South" : "North";
payload.latitude_dmm = payload.lati_hemisphere.charAt( 0 ) + " ";
payload.latitude_dmm += parseLatitude( raw_value, coordinate );
payload.latitude = ( parseFloat( coordinate.degrees ) + parseFloat( coordinate.minutes ) / 60 ) * ( (raw_value & 1) == 1 ? -1.0 : 1.0);
// GPS Longitude
coordinate.degrees = "";
coordinate.minutes = "";
raw_value = 0;
raw_value |= bytes[bytes_pos_++] << 24;
raw_value |= bytes[bytes_pos_++] << 16;
raw_value |= bytes[bytes_pos_++] << 8;
raw_value |= bytes[bytes_pos_++];
payload.long_hemisphere = (raw_value & 1) == 1 ? "West" : "East";
payload.longitude_dmm = payload.long_hemisphere.charAt( 0 ) + " ";
payload.longitude_dmm += parseLongitude( raw_value, coordinate );
payload.longitude = ( parseFloat( coordinate.degrees ) + parseFloat( coordinate.minutes ) / 60 ) * ( (raw_value & 1) == 1 ? -1.0 : 1.0);
// GPS Quality
raw_value = bytes[bytes_pos_++];
switch( (raw_value & 0xF0) >> 4 )
{
case 1:
payload.gps_quality = "Good";
break;
case 2:
payload.gps_quality = "Average";
break;
case 3:
payload.gps_quality = "Poor";
break;
default:
payload.gps_quality = (raw_value >> 4) & 0xF;
break;
}
payload.hdop = (raw_value >> 4) & 0xF;
// Number of satellites
payload.sats = raw_value & 0xF;
break;
// Presence of Uplink frame counter
case 4:
payload.ul_counter = bytes[bytes_pos_++];
break;
// Presence of Downlink frame counter
case 5:
payload.dl_counter = bytes[bytes_pos_++];
break;
// Presence of battery level information
case 6:
payload.battery_level = bytes[bytes_pos_++] << 8;
payload.battery_level |= bytes[bytes_pos_++];
break;
// Presence of RSSI and SNR information
case 7:
// RSSI
payload.rssi_dl = bytes[bytes_pos_++];
payload.rssi_dl *= -1;
// SNR
payload.snr_dl = bytes[bytes_pos_] & 0x7F;
if( (bytes[bytes_pos_] & 0x80) > 0 )
{
payload.snr_dl -= 128;
}
bytes_pos_++;
break;
default:
// Do nothing
break;
}
}
// Declaration & initialization
var status_ = bytes[0];
var bytes_len_ = bytes.length;
var bytes_pos_ = 1;
var i = 0;
var payload = {};
// Get raw payload
var temp_hex_str = ""
payload.payload = "";
for( var j = 0; j < bytes_len_; j++ )
{
temp_hex_str = bytes[j].toString( 16 ).toUpperCase( );
if( temp_hex_str.length == 1 )
{
temp_hex_str = "0" + temp_hex_str;
}
payload.payload += temp_hex_str;
}
// Get payload values
do
{
// Check status, whether a field is set
if( (status_ & 0x80) > 0 )
{
addField( i, payload );
}
i++;
}
while( ((status_ <<= 1) & 0xFF) > 0 );
return payload;
}
Catatan untuk menghubungkan ESP32 dengan LoRa Module RFM95w
| ESP32 | RFM95W |
| 23 | MOSI |
| 19 | MISO |
| 18 | SCK |
| 21 | SCL |
| 5 | NSS |
| 26 | DIO0 |
| 33 | DIO1 |
| 25 | RST |
Postingan kali ini adalah lanjutan dari postingan saya sebelumnya disini , nah pada postingan saya kali ini akan membahas bagaimana cara memparsing data json yang kita dapat dari ttn kemudian menampilkannya ke dalam dashboard, sehingga hasilnya seperti dibawah ini
[{"id":"1f1f6ed1.81cf91","type":"mqtt in","z":"7609c47a.c51b3c","name":"","topic":"+/devices/+/up","qos":"2","broker":"7833904b.af11d","x":220,"y":200,"wires":[["d839d790.4b77c8"]]},{"id":"d839d790.4b77c8","type":"json","z":"7609c47a.c51b3c","name":"","property":"payload","action":"obj","pretty":true,"x":470,"y":200,"wires":[["e2efc94c.1de158","47698174.a787f","9db17467.71c868","b38807c2.074058","6cc7cd06.b7c634"]]},{"id":"e2efc94c.1de158","type":"function","z":"7609c47a.c51b3c","name":"battery","func":"var obj = msg.payload;\nmsg.payload = obj.payload_fields.analog_in_3;\nreturn msg;","outputs":1,"noerr":0,"x":720,"y":180,"wires":[["9ea82fec.53c49"]]},{"id":"47698174.a787f","type":"function","z":"7609c47a.c51b3c","name":"temperature","func":"var obj = msg.payload;\nmsg.payload = obj.payload_fields.temperature_1;\nreturn msg;","outputs":1,"noerr":0,"x":710,"y":240,"wires":[["491b941b.7cb80c"]]},{"id":"9db17467.71c868","type":"function","z":"7609c47a.c51b3c","name":"humidity","func":"var obj = msg.payload;\nmsg.payload = obj.payload_fields.relative_humidity_2;\nreturn msg;","outputs":1,"noerr":0,"x":700,"y":300,"wires":[["754ca03c.46161"]]},{"id":"491b941b.7cb80c","type":"ui_chart","z":"7609c47a.c51b3c","name":"","group":"7fb7eee3.fc934","order":1,"width":0,"height":0,"label":"Temperature","chartType":"line","legend":"false","xformat":"HH:mm:ss","interpolate":"linear","nodata":"","dot":false,"ymin":"","ymax":"","removeOlder":1,"removeOlderPoints":"","removeOlderUnit":"86400","cutout":0,"useOneColor":false,"colors":["#1f77b4","#aec7e8","#ff7f0e","#2ca02c","#98df8a","#d62728","#ff9896","#9467bd","#c5b0d5"],"useOldStyle":false,"x":930,"y":240,"wires":[[],[]]},{"id":"9ea82fec.53c49","type":"ui_gauge","z":"7609c47a.c51b3c","name":"","group":"d98f26c6.56b8b8","order":1,"width":0,"height":0,"gtype":"gage","title":"Battery","label":"units","format":"{{value}}","min":0,"max":10,"colors":["#00b500","#e6e600","#ca3838"],"seg1":"","seg2":"","x":920,"y":180,"wires":[]},{"id":"754ca03c.46161","type":"ui_chart","z":"7609c47a.c51b3c","name":"","group":"7fb7eee3.fc934","order":2,"width":0,"height":0,"label":"Humidity","chartType":"line","legend":"false","xformat":"HH:mm:ss","interpolate":"linear","nodata":"","dot":false,"ymin":"","ymax":"","removeOlder":1,"removeOlderPoints":"","removeOlderUnit":"86400","cutout":0,"useOneColor":false,"colors":["#1f77b4","#aec7e8","#ff7f0e","#2ca02c","#98df8a","#d62728","#ff9896","#9467bd","#c5b0d5"],"useOldStyle":false,"x":920,"y":300,"wires":[[],[]]},{"id":"b38807c2.074058","type":"function","z":"7609c47a.c51b3c","name":"rssi","func":"var obj = msg.payload;\nmsg.payload = obj.metadata.gateways[0].rssi;\nreturn msg;","outputs":1,"noerr":0,"x":690,"y":360,"wires":[["9e68c3c6.729e5"]]},{"id":"9e68c3c6.729e5","type":"ui_chart","z":"7609c47a.c51b3c","name":"","group":"9a2e91ee.5594a","order":2,"width":0,"height":0,"label":"RSSI","chartType":"line","legend":"false","xformat":"HH:mm:ss","interpolate":"linear","nodata":"","dot":false,"ymin":"","ymax":"","removeOlder":1,"removeOlderPoints":"","removeOlderUnit":"86400","cutout":0,"useOneColor":false,"colors":["#1f77b4","#aec7e8","#ff7f0e","#2ca02c","#98df8a","#d62728","#ff9896","#9467bd","#c5b0d5"],"useOldStyle":false,"x":910,"y":360,"wires":[[],[]]},{"id":"6cc7cd06.b7c634","type":"function","z":"7609c47a.c51b3c","name":"rssi","func":"var obj = msg.payload;\nmsg.payload = obj.metadata.gateways[0].snr;\nreturn msg;","outputs":1,"noerr":0,"x":690,"y":420,"wires":[["c2e09073.55f99"]]},{"id":"c2e09073.55f99","type":"ui_chart","z":"7609c47a.c51b3c","name":"","group":"9a2e91ee.5594a","order":3,"width":0,"height":0,"label":"SNR","chartType":"line","legend":"false","xformat":"HH:mm:ss","interpolate":"linear","nodata":"","dot":false,"ymin":"","ymax":"","removeOlder":1,"removeOlderPoints":"","removeOlderUnit":"86400","cutout":0,"useOneColor":false,"colors":["#1f77b4","#aec7e8","#ff7f0e","#2ca02c","#98df8a","#d62728","#ff9896","#9467bd","#c5b0d5"],"useOldStyle":false,"x":910,"y":420,"wires":[[],[]]},{"id":"7833904b.af11d","type":"mqtt-broker","z":"","name":"application_name","broker":"asia-se.thethings.network","port":"1883","clientid":"","usetls":false,"compatmode":true,"keepalive":"60","cleansession":true,"birthTopic":"","birthQos":"0","birthPayload":"","closeTopic":"","closeQos":"0","closePayload":"","willTopic":"","willQos":"0","willPayload":""},{"id":"7fb7eee3.fc934","type":"ui_group","z":"","name":"Chart","tab":"5d83a158.d5268","order":2,"disp":true,"width":"6","collapse":false},{"id":"d98f26c6.56b8b8","type":"ui_group","z":"","name":"Gauge","tab":"5d83a158.d5268","order":1,"disp":true,"width":"6","collapse":false},{"id":"9a2e91ee.5594a","type":"ui_group","z":"","name":"Others","tab":"5d83a158.d5268","order":3,"disp":true,"width":"6","collapse":false},{"id":"5d83a158.d5268","type":"ui_tab","z":"","name":"Home","icon":"timeline"}]
function Decoder(bytes, port) {
var obj = new Object();
//temp
var tempEncoded=(bytes[2]<<8)|(bytes[1]);
var tempDecoded=(tempEncoded*175.72/65536)-46.85;
obj.temp=tempDecoded.toFixed(2);
//humidity
var humEncoded=(bytes[3]);
var humDecoded=(humEncoded*125/256)-6;
obj.hum=humDecoded.toFixed(2);
//period
var periodEncoded=(bytes[5]<<8)|(bytes[4]);
var periodDecoded=(periodEncoded*2);
obj.period=periodDecoded+" sec";
//battery
var batteryEncoded=(bytes[8]);
var batteryDecoded=(batteryEncoded+150)*0.01;
obj.battery=batteryDecoded.toFixed(2);
return obj;
}
The RisingHF’s Temperature and humidity LoRaWAN sensor node RHF1S001 is aimed at outdoor application with it’s IP64 protection level. And thanks to it’s high performance internal antenna and LoRa technology used, the sensor could operate in extremely hard environment or ultra-long range application. In addition to all above, the ultra-low sleep current help it to work in a long life, 5 years (uplink every 2 minutes) or even 10 (uplink every 5 minutes) years.
Here is sample code to displaying data to dashboard node-red, Raw data taken from MQTT convert to JSON Object.
[{"id":"4e63f2ca.376b64","type":"mqtt in","z":"b6605d08.a927b","name":"","topic":"thrf/#","qos":"2","broker":"ce3645f8.a18d78","x":70,"y":2920,"wires":[["9c30a7cc.16ac38"]]},{"id":"a4fb0e04.52f6b","type":"function","z":"b6605d08.a927b","name":"decode temp","func":"var obj = msg.payload;\nvar data = obj.data;\n\nvar temp1 = data.toString().substr(2, 2);\nvar temp2 = data.toString().substr(4, 2);\nvar temp = temp2 + temp1;\n// var tmp = \"0x\" + temp; \n\nfunction hexToDec(hex) {\n return hex.toLowerCase().split('').reduce( (result, ch) =>\n result * 16 + '0123456789abcdefgh'.indexOf(ch), 0);\n}\n\nvar value = hexToDec(temp);\n\nvar t = ((175 * value)/65536) - 46.85;\n\nmsg.payload = t.toFixed(2);\n// return msg;\n// msg.payload = obj.data;\nreturn msg;","outputs":1,"noerr":0,"x":430,"y":2980,"wires":[["db7f0faf.eec008"]]},{"id":"de0b9d41.21bd3","type":"function","z":"b6605d08.a927b","name":"data","func":"var obj = msg.payload;\nmsg.payload = obj.data;\nreturn msg;","outputs":1,"noerr":0,"x":410,"y":2920,"wires":[["88553271.5b5678"]]},{"id":"88553271.5b5678","type":"debug","z":"b6605d08.a927b","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":590,"y":2920,"wires":[]},{"id":"9c30a7cc.16ac38","type":"json","z":"b6605d08.a927b","name":"","property":"payload","action":"obj","pretty":true,"x":210,"y":2920,"wires":[["de0b9d41.21bd3","a4fb0e04.52f6b","3ef4e4a1.49fcac","cbbcecc.d9fbc9"]]},{"id":"3ef4e4a1.49fcac","type":"function","z":"b6605d08.a927b","name":"decode hum","func":"var obj = msg.payload;\nvar data = obj.data;\n\n\nvar humidity = data.toString().substr(6, 2);\n// var hum = \"0x\" + humidity; \n\nfunction hexToDec(hex) {\n return hex.toLowerCase().split('').reduce( (result, ch) =>\n result * 16 + '0123456789abcdefgh'.indexOf(ch), 0);\n}\n\nvar value = hexToDec(humidity);\n\n\nvar RH = (((125 * value)/256) -6);\n\nmsg.payload = RH.toFixed(2);\n\n// return msg;\n// msg.payload = obj.data;\nreturn msg;","outputs":1,"noerr":0,"x":430,"y":3040,"wires":[["3dd9c892.32f9b8"]]},{"id":"cbbcecc.d9fbc9","type":"function","z":"b6605d08.a927b","name":"decode batt","func":"var obj = msg.payload;\nvar data = obj.data;\nvar batt = data.toString().substr(16, 2);\n\nfunction hexToDec(hex) {\n return hex.toLowerCase().split('').reduce( (result, ch) =>\n result * 16 + '0123456789abcdefgh'.indexOf(ch), 0);\n}\n\n\n\nmsg.payload = (hexToDec(batt) + 150) * 0.01;\n\n// msg.payload = RH.toFixed(2);\n\n// return msg;\n// msg.payload = obj.data;\nreturn msg;","outputs":1,"noerr":0,"x":430,"y":3100,"wires":[["c70731a.a7ba85"]]},{"id":"3dd9c892.32f9b8","type":"ui_chart","z":"b6605d08.a927b","name":"","group":"44b692c4.bec04c","order":0,"width":0,"height":0,"label":"hum rhf","chartType":"line","legend":"false","xformat":"HH:mm:ss","interpolate":"linear","nodata":"","dot":false,"ymin":"","ymax":"","removeOlder":1,"removeOlderPoints":"","removeOlderUnit":"3600","cutout":0,"useOneColor":false,"colors":["#1f77b4","#aec7e8","#ff7f0e","#2ca02c","#98df8a","#d62728","#ff9896","#9467bd","#c5b0d5"],"useOldStyle":false,"x":640,"y":3040,"wires":[[],[]]},{"id":"c70731a.a7ba85","type":"ui_chart","z":"b6605d08.a927b","name":"","group":"44b692c4.bec04c","order":0,"width":0,"height":0,"label":"batt rhf","chartType":"line","legend":"false","xformat":"HH:mm:ss","interpolate":"linear","nodata":"","dot":false,"ymin":"","ymax":"","removeOlder":1,"removeOlderPoints":"","removeOlderUnit":"3600","cutout":0,"useOneColor":false,"colors":["#1f77b4","#aec7e8","#ff7f0e","#2ca02c","#98df8a","#d62728","#ff9896","#9467bd","#c5b0d5"],"useOldStyle":false,"x":640,"y":3100,"wires":[[],[]]},{"id":"db7f0faf.eec008","type":"ui_chart","z":"b6605d08.a927b","name":"","group":"44b692c4.bec04c","order":0,"width":0,"height":0,"label":"temperture rhf","chartType":"line","legend":"false","xformat":"HH:mm:ss","interpolate":"linear","nodata":"","dot":false,"ymin":"","ymax":"","removeOlder":1,"removeOlderPoints":"","removeOlderUnit":"3600","cutout":0,"useOneColor":false,"colors":["#1f77b4","#aec7e8","#ff7f0e","#2ca02c","#98df8a","#d62728","#ff9896","#9467bd","#c5b0d5"],"useOldStyle":false,"x":660,"y":2980,"wires":[[],[]]},{"id":"ce3645f8.a18d78","type":"mqtt-broker","z":"","name":"loralocal","broker":"00.00.00.00","port":"1883","clientid":"","usetls":false,"compatmode":true,"keepalive":"60","cleansession":true,"birthTopic":"","birthQos":"0","birthPayload":"","closeTopic":"","closeQos":"0","closePayload":"","willTopic":"","willQos":"0","willPayload":""},{"id":"44b692c4.bec04c","type":"ui_group","z":"","name":"RHF","tab":"b031aecd.a463f","order":1,"disp":true,"width":"6","collapse":false},{"id":"b031aecd.a463f","type":"ui_tab","z":"","name":"GATEWAY","icon":"desktop_mac","order":2}]
Datasheet sensor
http://www.risinghf.com/#/product-details?product_id=1&lang=en
Kali ini nyobain lora module buatan dragino namanya lora mini dev, uniknya dari module ini adalah sudah jadi satu antara RF dan mikro kontrollernya, untuk programmingnya sendiri cukup mudah karena sudah ada usb nya jadi tinggal colok aja mikro usb bawaannya terus bisa diprogram menggunakan arduino ide.
Reviewnya menyusul ya ini tadi baru test OTAA ke thethingsnetwork si lancar jaya cuman awalnya sempat bingung untuk pin mapping lmicnya, soalnya nyari nyari didokumentasinya ngga nemu.
Beruntung banget pas lagi browsing nemu, nah dibawah ini adalah pinout mappingnya karena kalau pinout ini salah dijamin lora mini dev ini ngga akan bekerja di lmic
const lmic_pinmap lmic_pins = {
.nss = 10,
.rxtx = LMIC_UNUSED_PIN,
.rst = 9,
.dio = {2, 6, 7},
};
Silahkan yang pingin nyoba nyoba ini modul bisa pake lmic standard tinggal nanti menyesuaikan lmicnya seperti diatas.
kalau mau liat2 codingannya ke github saya disini tinggal ganti lmicnya seperti diatas
Happy Coding ..
Salam ngoprek …
Akhirnya setelah kesana kemari browsing ketemu juga cara mqtt ke ttn kebetulan belakangan ini lagi iseng2 main lora dan gampangnya karena belum punya server sendiri saya pakai thethingsnetwork.org untuk test upload data ke server.
Nah semingguan ini saya penasaran ada ngga ya cara paling mudah untuk konek ke server ttn tanpa harus masuk ke console ttn, nah akhirnya ketemu juga caranya ternyata data kita di ttn bisa dibaca lewat mqtt.
Dengan mosquitto_sub kita bisa mengakses data di ttn, postingan ini sekali lagi bukan buat show off cuman sebagai catatan pribadi saya dan siapa tau bisa berguna buat yang lain juga.
mosquitto_sub -h <server>.thethings.network -t '+/devices/+/up' -u '<nama appid>' -P 'ttn-account-v2.<accesskey>' -v
Ganti beberapa paramater berikut saya bolak balik nyari akhirnya ketemu juga
kalau berhasil maka di terminal kita akan muncul random text yang isinnya uplink data kita ke ttn atau mau lihat yang lain juga bisa baca baca formatnya disini
Semoga bermanfaat lanjut ngoprek …
Bagi rekan rekan sekalian yang tertarik dengan dunia IOT, atau malah sudah mulai duluan dengan IOT, pasti tidak asing dengan the things network, the things network adalah komutas IOT global yang sudah ada di 90 negara dan memiliki member 23.068 orang, komunitas ini adalah komunitas IOT yang memanfaatkan teknologi LPWAN (Low Power Radio WAN) untuk menghubungkan sensor sensor IOT ke internet sehingga kita bisa mengakses sensor2 tersebut melalui internet.
Aplikasi ini adalah memanfaatkan komunitas sehingga apabila semakin banyak yang memasang gateway yang terhubung dengan jaringan TTN maka semakin banyak pula orang yang bisa menghubungkan sensor/nodenya keinternet menggunakan freq LPWAN tersebut.
Nah kebetulan saya berada di Jakarta, maka saya tertarik untuk mengembangkan teknologi ini di Jakarta, dan tentunya tidak bisa sendiri, kalau mau mengembangkan TTN dan membuat jaringan lorawan diseluruh jakarta atau bahkan di seluruh Indonesia.
Apa yang bisa dilakukan TTN, banyak hal kalau gateway kita sudah banyak kita bisa memanfaatkannya menjadi backend untuk memonitoring misal pintu air untuk memonitor banjir, smart garden, atau GPS Tracker, dan semuanya dijamin aman karena data data tersebut dienkripsi sehingga benar benar hanya kita yang bisa memonitor (kalau kita buat private) kalau data2 tersebut dibuat public tentu saja bisa bermanfaat orang lain misalkan notifikasi banjir via twitter dll.
kak eko 