Figure 9. Graph of the reading of the temperature sensor DS18B20 for the ThingSpeak service.

Food Parts FAQ

• Reverse the correct connection of the module;
• Reverse the correct connection of Rx, Tx contacts to the UART-USB adapter;
• Change the connection to the CH_PD contact to 3.3;
• Experimentally pick up the exchange rate on the serial port.

• Check the correct connection of the DHT11 sensor to the module.

• Change the connection of the module to the WiFi access point;
• Change the connection of the WiFi access point to the Internet;
• Reverse the correctness of the question before ThingSpeak.

At the process of developing and designing more and more folding projects, the time has come, if you need to learn how to work with such a broad type of connection like WiFi. So, as such, this type of communication can allow you to comfortably create a single line for your smart home appliances and use them, for example, from a mobile phone, a tablet or a computer, to create a smart smart home that will cost you dozens of times cheaper, lower buy ready solutions at the store. The stagnation of WiFi is obviously not limited to this and the application of this kind of communication of the flooring is rich, so that you can’t override them, and even if you squandered it on the other side, it means that you need WiFi, you need it, I got it right.

We will decide on the basis of the found and the most popular WiFi module ESP8266-01. You can buy the WiFi ESP8266-01 module on our website.

One of the main pluses of such a module is the presence of the memory of its microcontroller on the board, which allows you to work with it on your own, embedding the sketch directly into the module itself.

We won’t be able to modify the ESP8266 WiFi module really, but if you learn how to work with one, you can easily start working with others. I would like to know that a robot with WiFi can be done with unforgivable busyness, and since your luggage has few completed projects, it’s better to work on WiFi for the time being and to win over your radio communication projects, a robot with it is quite simple for a richer mind. By robots with WiFi modules, they create a number of splnnots and thematic forums, which in some cases bring more people to the surface, it’s important to sort out this type of call, and re-reading all the information, most people simply give up. It’s better for everything, and I can’t give up all the important information to contain within the framework of just one article, that one can’t be in the same sense, otherwise we’ll see the black rogue. I will try five ways of summing up the sequences of the most important moments, so that you could begin to understand the principle of working with this type of connection and then simply develop your own skills in this way directly.

І so, let's get started і for the cob of disassembly of the WiFi module ESP8266-01.

VCC- live module vіd 3V to 3.6V

GND- Earth.

RST- Visnovok Reset, which prompts for module reset.

CH_PD- "chip power-down" when power is applied, the robot of the module is activated.

TX- Data transfer (UART interface)

RX- data reception (UART interface)

GPIO0

GPIO2- port of introduction/opening of the official recognition

The GPIO0 and GPIO2 circuits are the same digital circuits, which are practical on Arduino boards for interfacing with various sensors, and stink at times of the implementation of independent robots on the internal microcontroller of the ESP8266-01 WiFi module.

For a good life of the ESP8266-01 module, switch the voltage to a stabilized voltage at 3.3V and don’t bother to take life on your Arduino board, because the module will keep the current up to 215mA and it may be bad for your board. If you take stabilized life at 3.3V, it's not a problem for you, otherwise it's too early for you to deal with this module. For example, it is necessary to use such a 3.3V and 5.0V YWRobot module for quick selection of circuits on prototyping boards, which allows you to easily take a stabilized voltage at 3.3V or 5V on the main paths of the prototyping board.

Connected Plus (+) 3.3V VCC module ESP8266-01, and minus (-) dzherela zhivlennya brought to vysnovka GND. In such a station, a red light will shine on the module, which signals us about the correct connection of life. In order for the module to be activated, it is also necessary to add a plus (+) dzherela living with vivodom CH_PD of the ESP8266-01 module and the power is immediately connected through a 10kΩ resistor. Now, if we turn on the liveliness, the modules are to blame for the burning of the red light and the blue light blinking once. If you have everything like that, it means everything is good, you have correctly received everything and your working module. In another case, turn the connection over again, or replace the module, shards of wine, better for everything, not working.

Let's go. For robots with WiFi module ESP8266, we need a USB-UART adapter. Adapters are available in different sizes, for example: FT232RL, CP2102, PL2303. And let's say you don't have such adapters, and as a USB-UART adapter, we'll use the Arduino board. I'm hacking for which Arduino NANO board, and you can hack if it's your order. Connection on any payment one to one identical. Zdіysnyuєmo zgіdno zgіdno z offensive scheme.

Let's see what we've done here. To show respect that we have shorted a jumper on the Arduino board RSTі GND. This manipulation turns on the microcontroller and allows us to use our Arduino board with a blue USB-UART adapter.

Oskіlki WiFi module ESP8266-01 lively in the vicinity of the city of life, do not forget that we are responsible for the land of all life in our projects. That's why we love the whiskers GND pay Arduino with earth (-) of our current 3.3V power supply, which is used for the power supply of the ESP8266-01 module.

Visnovok TX your Arduino board is connected to the output TX ESP8266-01 module This line will transmit data from the WiFi module to the Arduino board. Anyone familiar with the UART interface might think: "But how is it? You figured out that TX is responsible for connecting to RX. TX transmits information, and RX receives it." I You will be right. Everything is correct, connect TX to RX, and at the same time, if we work with the Arduino UART adapter, it is necessary to connect the device without a middle. Vvazhte tse blame іz rules.

Line RX your Arduino board is connected just like that directly to the line RX ESP8266-01 module This line transmits information from the Arduino board to the WiFi module board. Ale robimo tse z'ednannya through the so-called dilnik of the voltage, which consists of two resistors with nominal values ​​of 1 kOhm and 2 kOhm. We need to change the voltage on this line for the additional two resistors (voltage dilator), because the Arduino board transmits a logical signal with a voltage of 5V, and the WiFi module works with a voltage of 3.3V. For the transformation of the logical signal, we could have made a special twist of the transformation of the logical equals, which would have been much more correct, but again, it’s acceptable that you don’t have it, and we had a chance to drink more with a simple way and kill the target for additional work.

Everything necessary for the future work has been connected for the time being, but we still have 3 more visnovkas to spare ( GPIO0, GPIO2і RST) on the WiFi modules ESP8266-01. For the stable operation of the WiFi module, we need to set up the wires, which we have lost, to increase to the plus (+) module life lines through 10kΩ resistors.

Tse allow us to change the code (point) and make the work of the module stable. Better than robiti once. Otherwise, don’t be surprised that your module is constantly changing, you see, you didn’t understand the information, or you didn’t want to practice it. Vykoristovuvat podtyaguyuchi resistors on the back of the microcontroller can be, as a rule, you want stable work in your projects.

I am re-verifying the manufacturing process of the ESP8266-01 WiFi module. We turn on the liveliness and marvel, so that the red light ignites and the sprat blinks blue. Everything seems to be like this, it means miraculously we have far away. In another way, we check the correctness of the day, as well as the quality of all contacts. Maybe it’s just a banal situation, if ten times everything was wrong again and changed, that everything was connected correctly, but turning on the module, bachite, that the blue light is not adequate for itself, it’s constantly burning, it’s constantly blaming, or it’s not reacting to it. Tse mozhe statisya through the filthy contact on the same line. For example, choosing a circuit on a breadboard, it’s not easy to sit on your own place and not to make a change from resistors. Reverse the essence of the day. The module is already sensitive. Do not hate cym. This is often the reason for not stable work.

Zagalom, we finished our connections. At the same time, we need to prepare the Arduino IDE program for robots with the ESP8266-01 WiFi module. For this, we need to install in the Arduino IDE the necessary archives with libraries, applications and ESP boards, which will allow us to upload sketches directly from the microcontroller of the ESP8266-01 module, change the firmware too. As part of this article, we, more for everything, don’t need to fix it, but I’m sure that since we got it connected to the module, the order will be correct, so we can download everything necessary for work with the Arduino IDE. Everything here is, in principle, simple.

Starting the program Arduino IDE and go to the menu "File" - "Parameters"

At the top of the window, write "esp8266". As a result, we have no more firmware needed. When pressing on the firmware, a button will appear "Installed". Click on the button "Installed" And check, until everything gets up. Archive dosit great, close to 150 megabytes, and also happen to get better.

After the installation is completed. Rebooted the Arduino IDE and bachimo, as new ESP boards appeared at the "Tools" - "Pay" menu. On whom everything. We have completed the completion of the Arduino IDE. As long as we don’t need qi, we can’t do without them in a distant robot.

All of us have connected and prepared, now we can start sorting out the cherubs. In fact, at the same time, you will continue the re-verification and adjustment of the module for additional AT commands and you can’t do without it. WiFi modules are implemented in such a way that all connections with them are supported by the so-called AT commands, as they are sewn into the firmware of the module. We won't overdo all the AT commands here, do it a lot and if you want to do it all, you can easily know them on the Internet. And we will win at once the least necessary for the cob of work.

And so we connect our Arduino board via a USB cable to the computer. A zovnіshne dzherelo zhivlennya, like to live WiFi module ESP8266-01 for now, you don’t need to turn it on. We start the Arduino IDE program, select our Arduino board in the "Tools" menu, my choice is Arduino NANO, and you choose yours. So it’s not forgotten to choose the port to which our Arduino is connected. I spodіvayu all tse vy rozumієte and robiti vmієte.

Vіdkrivaєmo port monitoring "Instrumenti" - "Port Monitor". We select the port port 74880 (on such a speed, the launch of the module is expected) and it is possible to select "NL & CR" from the list

The axis is now connected to the call of life, like to live our WiFi module. If you are guilty, please enter approximately the following information in the port monitor.

Here we have some information about our WiFi module (speed, amount of memory on board, etc.). The information can be retrieved depending on the firmware version of the WiFi module. Let's not take any respect. More important. At the bottom, we typed blind symbols, which means that the speed of the port (74880 baud), we put it in, only fit for the cob capture of the module, to get this information, but the speed is not suitable for normal connection with the WiFi module.

To select the correct port security, just change the port security and send to the port (the field to the top and the edit button) symbol AT until we take it back OK. Yakshcho You will try to send symbols right at the same time AT to the port on the security code 74880, then take one or two blank symbols from the port.

Try to immediately set up the 115200 baud rate and issue the AT command. Most of the modules are flashed for the required speed.

The axis of such a picture is your fault at the port monitor. Just as everything is the same for the minds of the unreasonable typing of characters, reduce the speed and repeat the correction AT command, until you turn around OK. If you tried all the firmware and did not get the correct firmware, then you did not have mercy on the firmware module with non-standard firmware. Then it is not enough to reflash the module with a normal firmware, but the topic is also a stat.

I'm sure that everything is good and you got the correct swedishness. To the speech, yakshcho vim, the vimknuti I turn on the WiFi module, the same yak PIDIBILELED RIGHTSHENT, then the deputy of the same self, Yaki core on the slotkoye 74880 BOD, sink, skew, vypaki. ready" ". But we have the ability to look at the primary information in a normal way on the correct firmware, for which it is necessary to programmatically reconfigure the module for the help of the AT command AT+RST.

To find out about the firmware version of your ESP8266-01 WiFi module, you need to enter the command in the monitor port AT+GMR and at the same time you take approximately the following information:

WiFi module ESP8266-01 can work both in AP mode and in client mode. In order to allow the module to process the alarm in all modes, send the command to the monitor port AT+CWMODE=3 i have to take your guilt OK.

Team AT+CWLAP allow you to look through all WiFi access points, how to check your module at the moment. My module, for example, currently has less than three WiFi access points in its coverage area. Vidpovіd may be about the following:

For example, we know the password to the third access point, so that we can connect to it and the command AT+CWJAP="myname","password", in my opinion, the team looks AT+CWJAP="dsl_unlim_512_home","11111111", on which we will succeed in proving:

The command parameters are written to the flash memory of the ESP8266-01 WiFi module, and if I want to disable the module, I will re-enable, and automatically connect to the desired access point. Don’t let the team marvel at the team, otherwise take it away from the team ERROR. It is necessary to pay attention to those who in the remaining versions of the firmware recommend to win the command AT+CWJAP_CUR, then the command is visible AT+CWJAP_CUR="myname", "password". As we raptomy forgot, to which access point our module is connected, it is necessary to send a command AT+CWJAP? or AT+CWJAP_CUR? And we take away the access point, before connecting the WiFi module at the moment.

With connections and cob lashings WiFi module ESP8266-01 we got divorced. The module is working and ready for the implementation of your further projects. Explore all possible applications with this module within the framework of one article, it is simply impossible and we will deal with it in the upcoming articles. And for those who are not more familiar with programming, but if you want to start working on your projects for help with WiFi, I recommend getting to know the RemoteXY WiFi project designer. This site will help you without much difficulty in creating a control interface for your mobile phone or tablet and for the help of your add-on, until you connect the WiFi module.

After the appearance of payments based on the Wifi chip ESP8266, they became popular folk. The greatness of the opportunity and the minimum price, which did not exceed $ 5 at the start of sales and distribution, made their right. There were organized meetings around the chip, in which people share information and create software security.

What is the reason for such popularity, krim low price?

On the right, pay on the ESP8266 is not just a module for communicating via WiFi. The chip is essentially a microcontroller with its own SPI, UART interfaces, as well as GPIO ports, which means that the module can be built autonomously without Arduino and other boards with microcontrollers.

Information

With this look, I will win one of the highest boards ESP-01. Also, for a full-scale robot with a chip, a converter will be needed USB/UART, I recommend, looking around at mysku.

Connection

If you don’t have to put in two GPIOs in your projects, but you don’t have to deal with “brutal hacks”, then I recommend that you immediately buy new boards, for example ESP-07 or ESP-12. Just ask for help, so that you can pay for independent breeding and sale for this special mini-set.

Photos of these boards

ESP-01 hacked by Dave Allan, like a stock. Additionally, you will accept 4 GPIOs: GPIO14, GPIO12, GPIO13 and GPIO15

Connection scheme:
- ESP-01 VCC to USB/UART VCC (+3.3V);
- ESP-01 GND to USB/UART GND;
- ESP-01 URXD to USB/UART TXD;
- ESP-01 UTXD to USB/UART RXD;
- ESP-01 CH_PD to USB/UART VCC (+3.3V);
- ESP-01 GPIO0 to USB / UART GND - only one hour of firmware!

Firmware

In this review, there is no original NodeMCU firmware. You can look at the list of commands that apply.

Update the original "factory" firmware on NodeMCU:
- Zavantazhuemo utility for flashing -;
- zavantazhuemo firmware -;
- Connect via ESP-01 to USB/UART according to the diagram shown above. Don't forget to connect GPIO0 to GND. Plug USB/UART into the computer's USB port;
- Run XTCOM_UTIL.exe, go to Tools -> Config Device, select the COM port to which board is connected, set port 57600, select Open, then Connect, the program is to say "Connect with target OK!" Go to the API TEST menu, select (4) Flash Image Download, select the path to the file "nodemcu_512k_latest.bin", fill in the address 0x00000, typify DownLoad. Due to the rozpochatisya zavantazhennya firmware, after completion, you will see an update;
- Including live pay, see GPIO0 in the air dart, vmikaєmo live. Launch the Putty terminal, CoolTerm or in. (UVAGA! We change the port speed to 9600), we check the readiness to pay by the team
>print(node.chipid())
10013490

First script

For writing that scripting in the ESP8266, it will be small and handy IDE - :

Our first script, vimikatime and turn on the light with a periodicity of 2 seconds:
- Turn on life, up to GPIO2 turn on resistor and light diode. Including living;
- Run ESPlorer, select the required COM and port 9600 security, press Open;
- Insert the code and press Save To ESP;

Pin = 4 --GPIO2 gpio.mode(pin, gpio.OUTPUT) for i=1, 10, 1 do gpio.write(pin, gpio.LOW) tmr.delay(2000000) gpio.write(pin, gpio.HIGH ) tmr.delay(2000000) end
- DoFile is pressed to restart.

Connect DHT11 sensor

Pigs Fly code from the ESP8266.com forum

Works for DHT11 on ESP-07 (version w/16pins) and ESP-01 --Only 20141219 firmware tested. --Data stream acquisition timing is critical. There's --barely enough speed to work with to make this happen. --Pre-allocate vars used in loop. = 4; gpio.mode(pin, gpio.OUTPUT) tmr.delay(20000) gpio.write gpio.mode(pin, gpio.INPUT) --bus will always let up eventually, don't bother with timeout while (gpio_read(pin) ==0) do end c=0 while (gpio_read(pin)= =1 and c<100) do c=c+1 end --bus will always let up eventually, don"t bother with timeout while (gpio_read(pin)==0) do end c=0 while (gpio_read(pin)==1 and c<100) do c=c+1 end --acquisition loop for j = 1, 40, 1 do while (gpio_read(pin)==1 and bitlength<10) do bitlength=bitlength+1 end bitStream[j]=bitlength bitlength=0 --bus will always let up eventually, don"t bother with timeout while (gpio_read(pin)==0) do end end --DHT data acquired, process. Humidity = 0 HumidityDec=0 Temperature = 0 TemperatureDec=0 Checksum = 0 ChecksumTest=0 for i = 1, 8, 1 do if (bitStream >2) then Humidity = Humidity+2^(8-i) end end for i = 1, 8, 1 do if (bitStream > 2) then HumidityDec = HumidityDec+2^(8-i) end end for i = 1, 8, 1 do if (bitStream > 2) then Temperature = Temperature+2^(8-i) end end for i = 1, 8, 1 do if (bitStream > 2) then TemperatureDec = TemperatureDec+2^(8-i ) end end for i = 1, 8, 1 do if (bitStream > 2) then Checksum = Checksum+2^(8-i) end end ChecksumTest=(Humidity+HumidityDec+Temperature+TemperatureDec) % 0xFF print ("Temperature: "..Temperature..""..TemperatureDec) print ("Humidity: "..Humidity.."."..HumidityDec) print ("ChecksumReceived: "..Checksum) print ("ChecksumTest: "..ChecksumTest )

HTTP server

wifi.setmode(wifi.STATION) wifi.sta.config("SSID","password") print(wifi.sta.getip()) srv:listen(80,function(conn) conn:on("receive", function(conn,payload) print(payload) conn:send("

hello user.

Epilog