{"id":3465,"date":"2020-02-12T22:36:26","date_gmt":"2020-02-12T21:36:26","guid":{"rendered":"http:\/\/arduino.net.pl\/?p=3465"},"modified":"2020-05-23T21:31:21","modified_gmt":"2020-05-23T19:31:21","slug":"arduino-json-i-nrf24l01","status":"publish","type":"post","link":"https:\/\/arduino.net.pl\/index.php\/arduino-json-i-nrf24l01\/","title":{"rendered":"Arduino JSON i nRF24L01"},"content":{"rendered":"\n

JSON<\/a> to lekki i do\u015b\u0107 uniwersalny spos\u00f3b wymiany danych komputerowych. Nie znalaz\u0142em tutorialu, kt\u00f3ry pokaza\u0142by jak przesy\u0142a\u0107 tego typu dane przez sie\u0107 opart\u0105 o modu\u0142 radiowy nRF24L01. O nRF24l01<\/a> pisa\u0142em wielokrotnie. Wykorzystuj\u0105c ciekaw\u0105 bibliotek\u0119 bblanchon<\/strong> ArduinoJson<\/a> i korzystaj\u0105c z pomocy niezawodnych koleg\u00f3w z forum elektroda.pl<\/a> uda\u0142o mi si\u0119 napisa\u0107 program na arduino (TX) i nodeMCU (RX) kt\u00f3re pokazuj\u0105 jak prosto mo\u017cna korzysta\u0107 z dobrodziejstw formatu JSON<\/strong>. W przyk\u0142adzie przesy\u0142ana jest prosta struktura danych:<\/p>\n\n\n\n

temp: 35.33
hum: 77.77
light: 198 
batt: 3.33 <\/p>\n\n\n\n

TX JSON – arduino<\/h4>\n\n\n
\n\/*\n  TX Json, arduino Nano, nRF24l01\n*\/\n#include <ArduinoJson.h>\n#include <SPI.h>\n#include <Wire.h>\n#include <RF24.h>\n#include <RF24Network.h>\n\n#include <Timers.h>\nTimers <1> akcja;\n\n\nRF24 radio(7, 8);\nRF24Network network(radio);      \/\/ Include the radio in the network\nconst uint16_t this_node = 01;   \/\/ Address of this node in Octal format ( 04,031, etc)\nconst uint16_t node00 = 00; \/\/ (Address where the data is going)\n\nvoid setup() {\n\n  Serial.begin(115200);\n  SPI.begin();\n  radio.begin();\n  radio.setPALevel(RF24_PA_HIGH);\n  network.begin(2, this_node);  \/\/(channel, node address)\n  akcja.attach(0, 5000, wyslij_co5sek);  \/\/ inicjalizacja procesu\n}\n\nvoid loop() {\n  network.update();\n  akcja.process();  \/\/pooling timers\n}\n\n\/\/ ======================== FUNKCJE ===============================\nvoid wyslij_co5sek() {\n\n  \/\/wlasny podprogram do wykonania co 5s biblioteka Timers.h\n  DynamicJsonDocument doc(200);\n\n  doc["temp"] = 33.33 + random(10);\n  doc["hum"] = 77.77;\n  doc["light"] = 198;\n  doc["batt"] = 3.33;\n\n  String output = "";\n\n  serializeJson(doc, output); \/\/ tworzenie dokumentu Json w zmiennej output\n  Serial.println(output);\n\n  RF24NetworkHeader header(node00);     \/\/ (Address where the data is going)\n  bool ok = network.write(header, output.c_str(), output.length()); \/\/ Send the data\n  if (ok) {\n    Serial.println("Posz\u0142o do node00");\n  } else {\n    Serial.println("Brak kontaktu z node00!");\n  }\n}\n<\/pre><\/div>\n\n\n
RX JSON – nodeMCU ESP8266<\/h4>\n\n\n
\n\/*\n   RX JSON, nodeMCU ESP8266\n\n*\/\n#include <SPI.h>\n#include <Wire.h>\n#include <RF24.h>\n#include <RF24Network.h>\n#include <ArduinoJson.h>\n\n\nRF24 radio(2, 0);               \/\/ D4, D3 nRF24L01 (CE,CSN), D1, D2 zwolnione dla I2C \nRF24Network network(radio);      \/\/ Include the radio in the network\nconst uint16_t this_node = 00;   \/\/ Address of this node in Octal format ( 04,031, etc)\nconst uint16_t node01 = 01; \/\/ (Address where the data is going)\n\nchar incomingData[64];\n\nvoid setup() {\n\n  Serial.begin(115200);\n  SPI.begin();\n  radio.begin();\n  radio.setPALevel(RF24_PA_HIGH);\n  network.begin(2, this_node);  \/\/(channel, node address)\n\n}\n\nvoid loop() {\n\n  network.update();\n\n  while ( network.available() ) {     \/\/ Is there any incoming data?\n    RF24NetworkHeader header;\n    network.read(header, &incomingData, sizeof(incomingData)); \/\/ Read the incoming data\n\n    if (header.from_node == 1) {    \/\/ If data comes from Node 01\n      Serial.println("Przysz\u0142o z node01");\n      \/\/Serial.println(incomingData);\n\n      \/\/ ================== sekcja Json =================\n      \/\/StaticJsonDocument<200> doc;\n      DynamicJsonDocument doc(200);\n      DeserializationError error = deserializeJson(doc, incomingData);\n      if (error) {\n        Serial.print(F("ESP deserializeJson() failed: "));\n        Serial.println(error.c_str());\n        return;\n      }\n      serializeJsonPretty(doc, Serial);\n      Serial.println();\n      float hum = doc["hum"];\n      Serial.print("Wilgotno\u015b\u0107 = ");\n      Serial.println(hum);\n      Serial.println();\n    }\n  }\n}\n<\/pre><\/div>\n\n\n
W formacie JSON<\/strong> wygl\u0105da ona tak:
{ 
„temp”: 35.33, 
„hum”: 77.77, 
„light”: 198, 
„batt”: 3.33 
} <\/p>\n\n\n\n
Odwo\u0142anie do dowolnego elementu struktury po wywo\u0142aniu metody deserializeJson(doc, incomingData)<\/strong> wygl\u0105da tak:<\/p>\n\n\n\n
 float temperatura = doc[\"temp\"];\n  Serial.print(\"Temperatura = \");\n  Serial.println(temp);\n  Serial.println();<\/code><\/pre>\n\n\n\n
LINKI<\/h4>\n\n\n\n