Finished code
Make station id independent parameter Implement scrolling with rot encoder Normalize latin text add button
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dac7cc0818
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292
bus_lcd.ino
Normal file
292
bus_lcd.ino
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#include <LCDI2C_Multilingual.h>
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#include <WiFi.h>
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#include <HTTPClient.h>
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#include <Arduino_JSON.h>
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#include <Encoder.h>
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#define BTN_PIN 0
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int station_id = 126;
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void print_busses();
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void print_select_station();
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String stringify_field(JSONVar);
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int intify_field(JSONVar);
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void norm_text(char* text);
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Encoder enc(3, 4);
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long enc_position = 0;
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int last_button_state = 0;
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int station_selected = 0;
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// set LCD address, number of columns and rows
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// if you don't know your display address, run an I2C scanner sketch
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LCDI2C_Latin_Symbols lcd(0x27, 20, 4);
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char baseEndpoint[] = "https://bgpp.misa.st/api/stations/bg/search?id=";
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JSONVar busses;
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JSONVar response;
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int bus_index = 0;
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int busses_updated = 0;
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int scroll_updated = 0;
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int station_updated = 0;
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void setup() {
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pinMode(BTN_PIN, INPUT_PULLUP);
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// initialize LCD
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lcd.init();
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lcd.setAutoNewLine(false);
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// turn on LCD backlight
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lcd.backlight();
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Serial.begin(115200);
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delay(100);
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WiFi.begin("Decentrala", "");
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lcd.setCursor(0, 1);
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lcd.print("Povezujem se");
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Serial.print("\nConnection");
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while (WiFi.status() != WL_CONNECTED) {
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delay(500);
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Serial.print(".");
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lcd.print(".");
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}
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Serial.print("\nConnection OK, IP: ");
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Serial.print(WiFi.localIP());
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Serial.print(" Gateway: ");
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Serial.println(WiFi.gatewayIP());
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Serial.println("You can try to ping me ;-)");
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print_select_station();
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}
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void loop() {
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int encoder_change = 0;
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int button_pressed = 0;
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int btnState = !digitalRead(BTN_PIN);
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if (btnState != last_button_state) {
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last_button_state = btnState;
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if(btnState){
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button_pressed = 1;
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}
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}
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Serial.println(button_pressed);
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if (!station_selected) {
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if(button_pressed){
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station_selected = 1;
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fetch_busses();
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}
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}else {
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if(button_pressed){
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station_selected = 0;
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print_select_station();
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}
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}
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long newPosition = enc.read();
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if (newPosition != enc_position) {
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encoder_change += (newPosition - enc_position) / 4;
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enc_position = newPosition;
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}
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if (encoder_change && !station_selected) {
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station_id -= encoder_change;
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station_updated = 1;
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}
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if (encoder_change && station_selected) {
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bus_index -= encoder_change;
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scroll_updated = 1;
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if (bus_index < 0) {
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bus_index = 0;
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}
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if (bus_index > busses.length() - 4) {
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bus_index = max(busses.length() - 3, 0);
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}
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}
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if(station_updated){
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print_select_station();
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station_updated = 0;
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}
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if (busses_updated) {
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print_busses();
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busses_updated = 0;
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bus_index = 0;
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}
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if (scroll_updated) {
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print_busses();
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scroll_updated = 0;
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}
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delay(200);
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}
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void fetch_busses() {
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lcd.clear();
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lcd.setCursor(2, 1);
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lcd.println("Ucitavam...");
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char url[256] = { 0 };
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char id[5] = { 0 };
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strcpy(url, baseEndpoint);
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strcat(url, itoa(station_id, id, 10));
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HTTPClient http;
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http.begin(url);
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int responseCode = http.GET();
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if (responseCode > 0) {
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lcd.clear();
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lcd.setCursor(0, 1);
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lcd.print("HTTP response code: ");
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lcd.print(responseCode);
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String payload = http.getString();
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Serial.println(payload);
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response = JSON.parse(payload);
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if (JSON.typeof_(response) == "undefined") {
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lcd.clear();
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lcd.print("undefined");
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} else {
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// for(response["vehicles"])
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Serial.println(response["vehicles"][0]["lineNumber"]);
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busses = response["vehicles"];
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Serial.println(response["vehicles"]);
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}
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busses_updated = 1;
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} else {
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lcd.clear();
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lcd.setCursor(0, 1);
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lcd.print("error");
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}
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http.end();
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}
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void print_busses() {
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lcd.clear();
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lcd.setCursor(0, 0);
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String name = stringify_field(response["name"]);
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char namec[20] = { 0 };
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name.toCharArray(namec, 20);
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lcd.print(stringify_field(response["id"]));
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lcd.print(":");
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norm_text(namec);
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lcd.print(namec);
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// for (int i = 0; i < 16; i++) {
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// lcd.scrollDisplayLeft();
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// delay(250);
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// }
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// for (int i = 0; i < 16; i++) {
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// lcd.scrollDisplayRight();
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// delay(250);
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// }
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lcd.setCursor(0, 1);
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if (JSON.typeof_(busses) == "undefined" || JSON.typeof_(busses) == "null") {
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delay(1000);
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Serial.print("no busses");
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lcd.print("nema buseva");
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return;
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}
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for (int i = 0; i < min(busses.length(), 3); i++) {
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int busi = busses.length() - 1 - i - bus_index;
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JSONVar bus = busses[busi];
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String line_number = stringify_field(bus["lineNumber"]);
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int minutes = intify_field(bus["secondsLeft"]) / 60;
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lcd.setCursor(0, i + 1);
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lcd.print(line_number);
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lcd.print(": ");
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lcd.print(stringify_field(bus["stationsBetween"]));
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lcd.print("st ");
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lcd.print(minutes);
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lcd.print("'");
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}
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if (bus_index > 0) {
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lcd.setCursor(19, 1);
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lcd.print("^");
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}
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if (bus_index < busses.length() - 3) {
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lcd.setCursor(19, 3);
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lcd.print(">");
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}
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}
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void print_select_station() {
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lcd.clear();
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lcd.setCursor(0, 0);
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lcd.print("Izaberite broj stanice:");
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lcd.setCursor(1, 1);
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lcd.print(station_id);
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}
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int intify_field(JSONVar jfield) {
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if (JSON.typeof_(jfield) != "number") {
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return -1;
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}
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return (int)jfield;
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}
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String stringify_field(JSONVar jfield) {
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if (JSON.typeof_(jfield) == "number") {
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return (String)(int)jfield;
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}
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String field = JSON.stringify(jfield);
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return field.substring(1, field.length() - 1);
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}
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void norm_text(char* text) {
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int flag = 0;
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char* t = text;
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while (*t != 0) {
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switch (*t) {
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case 197:
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case 196:
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flag = 1;
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break;
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case 0x86:
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case 0x8c:
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*t = 'C';
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case 0x87:
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case 0x8d:
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*t = 'c';
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break;
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case 0xbd:
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*t = 'Z';
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break;
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case 0xbe:
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*t = 'z';
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break;
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case 0xa0:
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*t = 'S';
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break;
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case 0xa1:
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*t = 's';
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break;
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}
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if (flag) {
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flag = 0;
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char* c = t;
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while (*c != 0) {
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*c = c[1];
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c += 1;
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}
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t -= 1;
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}
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t += 1;
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}
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}
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