Module WEMOS D1 mini Pro based on ESP8266EX. A detailed description of how to integrate the module with Arduino environment can be found in the materials describing the modules previously made available: Amica and D1 mini. In addition to the configuration of the environment, you will find examples of digital (DS18B20), and analog (TMP35) use of the temperature sensor, as well as internet relay control. In the examples, you will find ways to connect the module to Blynk and Thingspeak to an IoT device.
To start working with the module we will use the current version of Arduino 1.8.3 environment downloaded from www.arduino.cc In short, adapting Arduino's environment to the cooperation with D1 Mini Pro looks like this
File->Preferences->Additional URLs to the board manager - paste: http://arduino.esp8266.com/stable/package_esp8266com_index.json Tools->Disc->Disc Manager->Device Manager and search for "wemos" and then install the package with ESP8266.
When the D1 module is connected to the USB port, a new serial port should appear in the system.
Tools->Board->D1 mini, and Tools->Report and select the com port of the USB converter<->UART.
From now on we can write our code, run sample codes (File->Examples e. g. ESP8266WiFi->WiFiScan) or test program codes that transform the D1 mini into an IoT device connected to the Internet using WiFi:
The D1 mini Pro board is equipped with flash memory 16MB and unlike the previously made available boards, the ESP8266 module does not contain soldered ESP8266Ex chip can be found on a single laminate. Unfortunately, at Arduino there is currently no easy way to use the entire 16MB flash memory and there is available 4MB as in the previous version of D1 mini. More flash capacity means "for the future"functionality. USB-converter USB<->UART is SIL2104 (I did not have to install any additional drivers during Win10 tests). The set includes a set of connectors for soldered soldering (male leaves and two female types of different lengths). On the board you will find a ceramic antenna (instead of a printed antenna) and a U. FL antenna connector, to which you can connect an external antenna using a FL U. D. Adapter to SMA. There are available antennas with a U. FL connector, antennas can be either in the form of antennas visible in the picture or flat microbeam antennas.
External antenna may be useful e. g. when installing the module in a metal housing. To use an external antenna instead of the built-in external antenna, the resistor "0" should be sold in a position allowing to connect the connector to the path leading to the circuit.
I compared the effectiveness of the D1 mini Pro ceramic antenna with the PCB antenna in the D1 mini model, the transmission range using a ceramic antenna seems to be slightly higher, but the correct operation is influenced much more by the presence of metal elements (flat metal plate can completely block communication).
Write reply how the ceramic antenna works in practice compared to the PCB antenna.
The underside of the tile is completely flat, there are no soldered elements.
This is how the D1 mini Pro is compared to the two previous D1 mini and NodeMCU Amica modules.
SPIFFS - flash file system. So far, as examples, we deal with quite simple examples of WiFi internet connection and reading data from analogue and digital temperature sensors. These are very good examples for starting with the ESP8266 based modules. Let's go beyond the diagram of the Internet temperature sensor and discuss the topic of data storage in FLASH memory module.
The D1 mini Pro D1 flash memory module can be used to store data organized in the file system SPIFFS. These can be e. g. files created by the module during operation (e. g. temporary data, or log), as well as files stored in the memory for the program (e. g. photos, graphics and other data needed e. g. to generate a menu on the graphic display screen).
The SPIFFS file system will not support directories, all files will be in the root directory "/". File name lengths are limited to 31 characters. In Arduino environment we can add a tool that will allow you to prepare the image of the file system and copy all necessary files placed in the "data" directory in the sketch directory. Download the tool: https://github.com/esp8266/arduino-esp8266fs-...n/releases/download/0.3.0/ESP8266FS-0.3.0.zip and in the Arduino directory (<home_dir>/Arduino/tools/) insert the unpacked jar file (<home_dir>/Arduino/tools/ESP8266FS/tool/esp8266fs.jar).
After restarting the Arduino environment, an additional option appears in the tools, which will overwrite the SPIFFS content with the data directory in the sketch directory.
Below the primitive program code that tests the capabilities of SPIFFS, after running the program from the serial console, we will be able to create, delete the file, add data to the file, view the file content, list the SPIFFS content, format the SPIFFS.
Log in, to see the code
The organization of file system data in a small flash memory built into the D1 mini Pro module may be useful in more advanced projects and will also eliminate the need for additional EEPROM memory or SD card.
The current consumption depends on the program being implemented, during tests it oscillated around 70mA with 5V power supply.
ESP8266 can be entered from a sleep state for a certain period of time, e.g.
ESP.deepSleep (300000000); // 300s sleep and reset by RTC
Details of how to do it here: https://www.elektroda.pl/rtvforum/topic3338096.html (pin D0 connected with Reset).
Ok, let's try to get "on the same page": uninstall this package in the manager. Restart the Arduino IDE. In the FILE menu, select PREFERENCES. In the window that appears, you'll have the field "Additional URLs for the tile manager". Paste there: http://arduino.esp8266.com/stable/package_esp8266com_index.json Now in the manager search for "esp8266 by Community". Install. After the intalation, the IDE reboot again. Now try to compile an example for this tile.