在Atmega32 + ESP8266 + LCD1602上获取天气信息的实现.zip

# Weather fetching on Atmega32 + ESP8266 + LCD1602 ### About [See the full docs!](http://styczynski.in/avr-weather-esp8266/) [And also see this on git!](https://github.com/isis97/avr-weather-esp8266)  ### Short description This project tends to implement: * ESP8266 module messaging from AVR controller * Basic Http request + JSON parsing * LCD support ### Why it has been made? Because of the microcontroller exercises we did on our studies. ### What does it do? * Boots up (if you press any key) the avr enters `settings mode` and asks for wifi creditentials * If no key was pressed during boot then normal procedure takes place * AVR tries to connect to the wifi * Then connects to `openweathermap.com` * Asks politely for weather data for `Warsaw` * Then fetches `JSON` with the most trivial ways * Displays the data * And sometimes refreshes the collected data :) ### Pinout #### Main wirings The AVR connections are basic and listed below: ```javascript 'ATMEGA32' PA0 -> D4 'LCD' 'ATMEGA32' PA1 -> D5 'LCD' 'ATMEGA32' PA2 -> D6 'LCD' 'ATMEGA32' PA3 -> D7 'LCD' 'ATMEGA32' PA4 -> RS 'LCD' 'ATMEGA32' PA5 -> RW 'LCD' 'ATMEGA32' PA6 -> E 'LCD' 'ATMEGA32' RXD -> TX 'ESP8266' 'ATMEGA32' TXD -> RX 'ESP8266' 'ESP8266' EN -> VCC 'ESP8266' ``` And of course `V0`, `VCC`, `GND`, `VSS`, `VDD`, `A`, `K` but they are trivial. #### Buttons And not mentioned in layout two buttons for settings screen: ```javascript 'ATMEGA32' PD6 -(BUTTON)-> GND 'ATMEGA32' PD7 -(BUTTON)-> GND ``` In settings mode: * `PD6` is used have next character functionality. * `PD7` changes current character. Schematic of connections (pretty small - try to enlarge with zooming hand):  **Notice:** *The `ESP8266` module was connected to the `5V USB` plug. The module is designed to work for 3V but working on higher voltage is possible (as demonstrated in this case).* *It's straightforward method and in normal conidtions you should redesign scheme a little and provide 3V voltage source for your wifi module.* *You will probably need logic level shifting form `5V (atemga)` to `3V (esp8266)` or you can just run atmega on 3V (notice that LCD needs standard 5V anyway!)* #### Mounting You can mount the wires propably on pcb plate I used universal brakboard that does not require soldering but it's rather a messy pile of cables, huh! ### About building #### Build process **Warnning!** *Before building make sure all it's configured correctly (see configuration for more details)!* To build the project do the following: * Create release folder e.g. `mkdir release` * Go into that folder `cd release` * Run CMAKE to generate needed makefiles `cmake ..` * Build app using make `make` * Optionally update documentation throught `make doc` * Optionally setup manually the needed fuse bits using `avrdude`! * Flash controller with `make upload` * Optionally clean build with `make clean` #### Configuration Before continouing make sure that `USSID` and `PASSWD` Variables in `src/main.c` are configured to use with your wifi access point. Then make sure that `APIKEY` in line with `wifi_send` is matching apikey for your openweathermap account. And the url is for location desired by you. See `openweathermap api documentation` for more details :) The main controller config is placed in `CMakeLists.txt` file. Please change these as you wish: ```bash # Variables regarding the AVR chip set(MCU atmega32) set(F_CPU 8000000) set(BAUD 9600) set(PROG_TYPE usbasp) set(PROG_ARGS ) ``` `BAUD` is not really needed and `PROG_ARGS` are additional paramters for avrdude. Basic example config for `Atmega328P-PU` running (by default) at 1MHz: ```bash # Variables regarding the AVR chip set(MCU atmega328p) set(F_CPU 1000000) set(BAUD 2400) set(PROG_TYPE usbasp) set(PROG_ARGS ) ``` ### Some source code This snippet presents piece of source code from `main.c` (and is good introduction to the project insides as well as wifi.h module): ```cpp // Handle ESP8266 events void wifi_event_handler(int event, const char* input, const int len) { switch(event) { case WIFI_EVENT_ANY: { // // You can display the input // To provide debug info // This kind of event (ANY) // is called for any event // return; } break; case WIFI_EVENT_ERROR: { // We got error! } break; // ESP8266 is not responding case WIFI_EVENT_TIMEOUT: { // We got timeout! } break; // Wifi was connected case WIFI_EVENT_WIFI_CONNECTED: { // We are conneted to the access point! } break; // Wifi was disconnected case WIFI_EVENT_WIFI_DISCONNECTED: { // We are disconneted to the access point! } break; // Connect to host case WIFI_EVENT_CONNECTED: { // We are connected to the ip/url specified earlier throug wifi_link_open } break; // Host sends data case WIFI_EVENT_DATA: { // // Look for JSON data in response // search_json(weather_descr, input, "description"); search_json(weather_name, input, "name"); search_json(weather_data_buf, input, "humidity"); sscanf(weather_data_buf, "%lf", &weather_humidity); search_json(weather_data_buf, input, "pressure"); sscanf(weather_data_buf, "%d", &weather_pressure); search_json(weather_data_buf, input, "temp"); sscanf(weather_data_buf, "%lf", &weather_temp); // We do not need this connection anymore wifi_link_close(); // Format received data sprintf(info1, "%s Weather:", weather_name); sprintf(info2, "%s | Temp: %.1lf C | Humidity: %.0lf %% | Pressure: %d HPa", weather_name, weather_temp-273.15, weather_humidity, weather_pressure ); // // Display data continously in text shifting manner // int shift = 0; const int info_len = strlen(info2); int cycles = 0; while(1) { lcd_clrscr(); lcd_gotoxy(0, 0); lcd_nputs(info1, 16); lcd_gotoxy(0, 1); lcd_nputs(info2+shift, 16); _delay_ms(500); ++shift; if(shift > info_len - 4) { shift = 0; ++cycles; } // // End - return to main and then prepare next fetch request // if(cycles > 15) break; } lcd_nputs("Update...", 16); lcd_clrscr(); } break; } } int main(void) { // Init UART uart_init(UART_BAUD_SELECT(2400, F_CPU)); // Init buttons // // ... // // Init LCD lcd_init(LCD_DISP_ON); lcd_gotoxy(0, 0); lcd_clrscr(); // Init wifi and connect to the desired network lcd_clrscr(); lcd_puts("Initializing..."); _delay_ms(1000); wifi_init(); // // Check if any button was pressed // then go into settings mode :) // // // ... // // // Normal boot sequence // normal_boot: // Display greeting on lcd lcd_puts("Hello"); _delay_ms(1000); lcd_clrscr(); _delay_ms(1500); lcd_clrscr(); lcd_puts("Conecting..."); _delay_ms(1000); // // Display USSID/PASSWD data on the screen // lcd_clrscr(); lcd_puts("ID: "); lcd_puts(USSID); lcd_puts("\nPASS: "); lcd_puts(PASSWD); _delay_ms(1500); // Try to connect to the access point wifi_connect(USSID, PASSWD); while(1) { // To make sure nothing dumb trash does not come // through UART interface uart_flush(); // Connect to openweathermap wifi_link_open("TCP", "api.openweathermap.org", 80); // Request data from REST api wifi_send("GET /data/2.5/weather?q=warsaw&APPID=cf24c94ac2550178e2ea4e970cd0f416 HTTP/1.1\r\nHost: api.openweathermap.org\r\nConnection: keep-alive\r\nCache-Control: max-age=0\r\n\r\n\r\n"); // Wifi functions will call wifi_event_handler function on any event