What's your favorite embedded/prototyping development board?
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@MakerGram
Personally.. For me Arduino Uno is my favorite board considering its simplicity, ease of use and most importantly the best board to with if you are just starting out and the environment is still new to you
Also another huge bonus I would say is that there is a huge community with more than enough expertise to guide you and help you if needed.
And one more thing is the IDE is simple yet versatile and is easily understandable -
@stephenlstrange I have worked on some applications with BLE. Yeah, it's true, BLE of ESP32 kinda sucks, it's still in development in some issues. Right now ESP32 is supporting Mesh topology too. Just if you're curious, watch this Mesh example video
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@kowshik1729 Wow that looks very nice indeed, i do have like 50 or 60 development boards of esp32 i'm gonna try this myself...
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I like Arduino nano, because it's size makes fit in any projects beautifully and most of all, it is as easy as any other Arduino. The Arduino IDE is very simple and support all of its boards. For any beginner who has projects with 8-bit needs, Arduino nano can give its best..
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My favourite prototyping development board is Arduino Uno and Nodemcu #ArduinoUyir:fire: Because with these 2 board we can do most projects. Single Analog pin is the only problem with Nodemcu. That can be resolved by any other basic Arduino family development board. Both these two boards I fall in love:heart: with hardware. Nodemcu's WiFi+Uno's digital/analog pins. Also using these two a begginer can learn almost everything in hardware.
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One of my favourite development board is arduino.I am not specifying any model because it varies upon the projects which we are doing as well as users who handles it.For beginners Arduino boards are easy to understand as well as perfect to develop skill in their making.
Some factors which make arduino a beginner-friendly board from others are-
Provides easiest debugging environment.
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These boards will be helpfull for a beginner as well as a professional inorder develop their skill.(If you know how to design an arduino board eventhough its not a microcontroller you can develop a new board by yourself)
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You can find enumerous libraries and IC's build for the same.
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Runs on low voltage,less external circuits required for many projects,led indication(which makes a beginners' tasks and learning easy)
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Community support and its fame(Almost every hardware makers will have a previous experience with this board so any doubts or questions can be easily clarified for the beginners)
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Prototyping language is not that much tough(C/C++) and also this IDE can be done in every platforms like Mac,Linux,Windows.
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Size-according to your project or tasks you can use different models.
I dont think there will be an ideal development board like everyone said there will be pros and cons for every boards.And also there is a main factor which made me to say like this and that is I have only used some of them like arduino,esp,pi🙃🙃
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For beginners as well as intermediate makers i prefer Arduino Micro or Leonardo. It is very easy to use like an Arduino UNO or Nano and has the same features of ATmega328P as well as a must-have feature support built-in USB and can use it as a USB host Device or HID device. I also prefer Arduino Nano boards rather than using Arduino UNO boards because of its size only.
For simple and minimal projects i love to use ATtiny 16/84/85 microcontrollers(My own boards) or digispark boards. It is cheaper smaller in size and works with ultra-low power mode.
In the IoT perspective, I prefer ESP8266/ESP32 boards if you want to add wifi/BLE features into your project. The cheapest and the best solution for IoT projects so far. Have large community support and supported by different programming platforms like Arduino IDE, MicroPython, ESP IDF, etc.... Esp32 is a powerful 32-bit microcontroller capable of wrapup any heavy project we think!
Recent Posts
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@salmanfaris Actually I'm not sure what was that Core 0 register dump:
But I parsed the JSON. Refer Here for cJSON example. But while working this one, faced another problem. HTTP response includes the whole headers, status code, and body. JSON parser only work if the whole response in the form of JSON. So, Initially stored all responses into a char buffer and cleaned all headers. By using if(response[i] == '{' ) and some flags. -
@rafitc99 How did you solved?
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@salmanfaris Yes. I fixed it. But no idea about the reason for this error.
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@rafitc99 Are you able to fix this issue!
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I'm trying to parse Json using cJson Library
But getting error Core 0 register dump: and the microcontroller is resetting.
I'm using ESP8266 and its on SDK for writing firmware. (ESP-IDF)Below I'm adding complete error log and code.
In below code this part is causing for this error and reset
json = cJSON_Parse(version); out = cJSON_Print(json); cJSON_Delete(json); printf("%s\n", out); free(out); I (10824) example: ... socket send success I (10828) example: ... set socket receiving timeout success I (11234) example: JSon Parser calling Guru Meditation Error: Core 0 panic'ed (LoadProhibited). Exception was unhandled. Core 0 register dump: PC : 0x4000bf80 PS : 0x00000030 A0 : 0x4022f684 A1 : 0x3fff70e0 0x4022f684: _puts_r at /home/dongheng/workspace/espressif/newlib_xtensa-2.2.0-bin/newlib_xtensa-2.2.0/xtensa-lx106-elf/newlib/libc/stdio/../../../.././newlib/libc/stdio/puts.c:90 A2 : 0x00000000 A3 : 0xfffffffc A4 : 0x000000ff A5 : 0x0000ff00 A6 : 0x00ff0000 A7 : 0xff000000 A8 : 0x401078a0 A9 : 0x0000010c A10 : 0x402559f0 A11 : 0x50545448 A12 : 0x00000000 A13 : 0x40106458 A14 : 0x00000000 A15 : 0x3ffeaaf8 SAR : 0x0000001d EXCCAUSE: 0x0000001c Backtrace: 0x4000bf80:0x3fff70e0 0x4022f684:0x3fff70e0 0x4022f724:0x3fff7110 0x4022dc31:0x3fff7120 0x4022f684: _puts_r at /home/dongheng/workspace/espressif/newlib_xtensa-2.2.0-bin/newlib_xtensa-2.2.0/xtensa-lx106-elf/newlib/libc/stdio/../../../.././newlib/libc/stdio/puts.c:90 0x4022f724: puts at /home/dongheng/workspace/espressif/newlib_xtensa-2.2.0-bin/newlib_xtensa-2.2.0/xtensa-lx106-elf/newlib/libc/stdio/../../../.././newlib/libc/stdio/puts.c:139 0x4022dc31: http_get_task at /Users/rafi/Desktop/hawk/ESP8266_RTOS_SDK/examples/protocols/http_request/main/http_request_example_main.c:208 @?Z-nP?M 'γ? %[ )Q ?O??T5??)?))??e5?? ?L?C? I?TZ ??TR?enB?[ ??Q ?ؚ?P9?)?N9?Ɇ )dг 5?P NRA?)ڻ^?)?N9?B??JA? %Y.??+????D W? ??ZQH???~?N??))GD?@ %Y.?^Z1O????Eؓ? PF???J[ !d?TP?HP'i 3mʉOC??JC?%YB7օ+k?))GD?@5 %Y J+?1mG?A??JA? %? %^u@? 5%ʃ?E???J M % ƣ??[?P?TQ+E???J % ??C?T?nV??@ -??\)DV?Q?NX???? %[ -Z?IP?L ?E?)??JCB??q! 1iGq?P#?? %??MC??JA@!%Y%.?M%,?i !XG?)!Eؑ? h? %^u??? 1?Ls?Y?P??Q?A??J ? #??C?5dԵ1?LT?P?????????m \?]eFL?))E???J ?D????5l?V?1NT? PE??M????@P?\9'?? +??+)GD?@?F@J??I?7?n 9)5NT?,R?e7??E@@)IJ?+ YЛ? ?EBH??A?Z5dֵ?LT??G?1?1??mP#?EFB?CH?)!Eؑ? `n #???7nʋ?1DT? ? XU?MTՋ9E??5????@ )R}?OC??JC%YY?V?P%?1?LL[ !?ֳ\ZQ?N?I (306) system_api: Base MAC address is not set, read default base MAC address from EFUSE I (312) system_api: Base MAC address is not /* HTTP GET Example using plain POSIX sockets This example code is in the Public Domain (or CC0 licensed, at your option.) Unless required by applicable law or agreed to in writing, this software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. */ #include <string.h> #include "freertos/FreeRTOS.h" #include "freertos/task.h" #include "freertos/event_groups.h" #include "esp_wifi.h" #include "esp_event_loop.h" #include "esp_log.h" #include "nvs_flash.h" #include <netdb.h> #include <sys/socket.h> #include "cJSON.h" /* The examples use simple WiFi configuration that you can set via 'make menuconfig'. If you'd rather not, just change the below entries to strings with the config you want - ie #define EXAMPLE_WIFI_SSID "mywifissid" */ #define EXAMPLE_WIFI_SSID CONFIG_WIFI_SSID #define EXAMPLE_WIFI_PASS CONFIG_WIFI_PASSWORD /* FreeRTOS event group to signal when we are connected & ready to make a request */ static EventGroupHandle_t wifi_event_group; /* The event group allows multiple bits for each event, but we only care about one event - are we connected to the AP with an IP? */ const int CONNECTED_BIT = BIT0; /* Constants that aren't configurable in menuconfig */ #define WEB_SERVER "hawk-ota.herokuapp.com" #define WEB_PORT 80 #define WEB_URL "http://hawk-ota.herokuapp.com/api/get-json" static const char *TAG = "example"; static const char *REQUEST = "GET " WEB_URL " HTTP/1.0\r\n" "Host: "WEB_SERVER"\r\n" "User-Agent: esp-idf/1.0 esp32\r\n" "\r\n"; char version[50]; char *out; cJSON *json; /* void Parse_Json(char *text) { if (!json) { printf("Error before: [%s]\n", cJSON_GetErrorPtr()); } else { out = cJSON_Print(json); cJSON_Delete(json); ESP_LOGI(TAG,"\n here"); puts(out); free(out); } }*/ static esp_err_t event_handler(void *ctx, system_event_t *event) { /* For accessing reason codes in case of disconnection */ system_event_info_t *info = &event->event_info; switch(event->event_id) { case SYSTEM_EVENT_STA_START: esp_wifi_connect(); break; case SYSTEM_EVENT_STA_GOT_IP: xEventGroupSetBits(wifi_event_group, CONNECTED_BIT); break; case SYSTEM_EVENT_STA_DISCONNECTED: ESP_LOGE(TAG, "Disconnect reason : %d", info->disconnected.reason); if (info->disconnected.reason == WIFI_REASON_BASIC_RATE_NOT_SUPPORT) { /*Switch to 802.11 bgn mode */ esp_wifi_set_protocol(ESP_IF_WIFI_STA, WIFI_PROTOCOL_11B | WIFI_PROTOCOL_11G | WIFI_PROTOCOL_11N); } esp_wifi_connect(); xEventGroupClearBits(wifi_event_group, CONNECTED_BIT); break; default: break; } return ESP_OK; } static void initialise_wifi(void) { tcpip_adapter_init(); wifi_event_group = xEventGroupCreate(); ESP_ERROR_CHECK( esp_event_loop_init(event_handler, NULL) ); wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT(); ESP_ERROR_CHECK( esp_wifi_init(&cfg) ); ESP_ERROR_CHECK( esp_wifi_set_storage(WIFI_STORAGE_RAM) ); wifi_config_t wifi_config = { .sta = { .ssid = EXAMPLE_WIFI_SSID, .password = EXAMPLE_WIFI_PASS, }, }; ESP_LOGI(TAG, "Setting WiFi configuration SSID %s...", wifi_config.sta.ssid); ESP_ERROR_CHECK( esp_wifi_set_mode(WIFI_MODE_STA) ); ESP_ERROR_CHECK( esp_wifi_set_config(ESP_IF_WIFI_STA, &wifi_config) ); ESP_ERROR_CHECK( esp_wifi_start() ); } static void http_get_task(void *pvParameters) { const struct addrinfo hints = { .ai_family = AF_INET, .ai_socktype = SOCK_STREAM, }; struct addrinfo *res; struct in_addr *addr; int s, r, j = 0; char recv_buf[64]; while(1) { /* Wait for the callback to set the CONNECTED_BIT in the event group. */ xEventGroupWaitBits(wifi_event_group, CONNECTED_BIT, false, true, portMAX_DELAY); ESP_LOGI(TAG, "Connected to AP"); int err = getaddrinfo(WEB_SERVER, "80", &hints, &res); if(err != 0 || res == NULL) { ESP_LOGE(TAG, "DNS lookup failed err=%d res=%p", err, res); vTaskDelay(1000 / portTICK_PERIOD_MS); continue; } /* Code to print the resolved IP. Note: inet_ntoa is non-reentrant, look at ipaddr_ntoa_r for "real" code */ addr = &((struct sockaddr_in *)res->ai_addr)->sin_addr; ESP_LOGI(TAG, "DNS lookup succeeded. IP=%s", inet_ntoa(*addr)); s = socket(res->ai_family, res->ai_socktype, 0); if(s < 0) { ESP_LOGE(TAG, "... Failed to allocate socket."); freeaddrinfo(res); vTaskDelay(1000 / portTICK_PERIOD_MS); continue; } ESP_LOGI(TAG, "... allocated socket"); if(connect(s, res->ai_addr, res->ai_addrlen) != 0) { ESP_LOGE(TAG, "... socket connect failed errno=%d", errno); close(s); freeaddrinfo(res); vTaskDelay(4000 / portTICK_PERIOD_MS); continue; } ESP_LOGI(TAG, "... connected"); freeaddrinfo(res); if (write(s, REQUEST, strlen(REQUEST)) < 0) { ESP_LOGE(TAG, "... socket send failed"); close(s); vTaskDelay(4000 / portTICK_PERIOD_MS); continue; } ESP_LOGI(TAG, "... socket send success"); struct timeval receiving_timeout; receiving_timeout.tv_sec = 5; receiving_timeout.tv_usec = 0; if (setsockopt(s, SOL_SOCKET, SO_RCVTIMEO, &receiving_timeout, sizeof(receiving_timeout)) < 0) { ESP_LOGE(TAG, "... failed to set socket receiving timeout"); close(s); vTaskDelay(4000 / portTICK_PERIOD_MS); continue; } ESP_LOGI(TAG, "... set socket receiving timeout success"); /* Read HTTP response */ do { bzero(recv_buf, sizeof(recv_buf)); r = read(s, recv_buf, sizeof(recv_buf)-1); for(int i = 0; i < r; i++) { //putchar(recv_buf[i]); version[j++] = recv_buf[i]; } } while(r > 0); version[j++] = '\0'; ESP_LOGI(TAG, "JSon Parser calling"); json = cJSON_Parse(version); out = cJSON_Print(json); cJSON_Delete(json); printf("%s\n", out); free(out); j=0; ESP_LOGI(TAG, "... done reading from socket. Last read return=%d errno=%d\r\n", r, errno); close(s); for(int countdown = 10; countdown >= 0; countdown--) { ESP_LOGI(TAG, "%d... ", countdown); vTaskDelay(1000 / portTICK_PERIOD_MS); } ESP_LOGI(TAG, "Starting again!"); } } void app_main() { ESP_ERROR_CHECK( nvs_flash_init() ); initialise_wifi(); xTaskCreate(&http_get_task, "http_get_task", 16384, NULL, 5, NULL); } ///Users/rafi/desktop/hawk/ESP8266_RTOS_SDK/examples/protocols/http_request