Thus, you have a high data rate, but only a limited range. (1) Connect HC12 Module with UART1 Port of DUE. It is recommended to supply the HC 12 module with an external source with 5 V, as it has some serial USB converters that do not supply enough current to supply the module. To turn off the LEDs just press B0 or B1 to turn off the respective led. Add your wifi router details then upload the sketch to the ESP32. Now we know the hardware is working, we need to start writing the actual code that the Hub will use. Is that what it should be? First you will learn how to make a wireless instant messenger with the least effort possible. You mention a decoupling capacitor, but not its value or orientation. If you wish to do this, find an enclosure big enough to fit the electronics in with the micro USB connected. In serial data transfer, you can set the number of bits that are transmitted per byte. An integer type has two bytes and to transmit this information we have to divide it into two bytes. btnIPSave_OnTouch() Saves the IP address in the text box to a file in the device memory. If the sensor was read correctly, we have to perform some conversions on this information before sending it via serial communication using the HC 12 module. It is possible to connect two types of antennas in this module, a helical antenna that comes with the module or another antenna to be connected to the UFL connector. However I will cover the basics so you will be able to change the module's baud rate, transmission power, channels and working modes. Best way is to use an own power supply for the HC-12 module. Is there any danger of someone else interfering with the signal to grab control of the receiving arduino? Both buttons are activated at a low logic level when the buttons are pressed. Easy, cheap and very small. The module can drive DC motors that have voltages between 5 and 35V, with a peak current up to 2A. HubStatus() Sends a GET request to the end point we created on the ESP32 Hub. VHB tape is very useful for doing this. The code is the same for both Arduinos. The lines are HIGH, and signals are LOW. The radio baud rate is even reduced to 500 bps. hii sir, i am working on HC-12 module from some months and the equipment runs 24/7, it was working well till now, but now it is not working fine, when i start the device, it works well for 3-4 hours , then after it does not receive or even transmit data signals.i have changed its connection from software UART to hardware as well,i am powering it upto 4.5 volts and power adapter is capable of providing 2A current an also i have provided capacitor of 100nf as decoupling capacitor, but still i am getting this errors daily , every day i have to restart the device and it works nicely only for few hours,i hope u might help me in this problem,Thanking You sir,Chandresh Suthar, Reply The HC-12 module consumes 3.6 mA (I measured 3.8 mA) as long as it does not send. In these cases remote reading is an alternative to be used, there are several radio transceivers that can be used, such as HC 12, NRF24L01, Lora module, among others. If it connects successfully you should see the IP address of the ESP32s webserver appear. The module is now set to a working frequency of 441.4MHx. It will only need 23 A. erkinsahin / hc-12_si4463. Before we start configuring the module, we must download the Termite software available at the link: Download Termite Software. Do you have the same setting on the serial monitor? If nothing happens, download Xcode and try again. A toggle button is used often in electronics. Do not overdo it with the transmitting power. The sensor performs the temperature and humidity measurement and sends these measurements to the base. HC-12 wireless serial port communication module is a new-generation multichannel embedded wireless data transmission module. The send sketch sends the string test123 on button press. The cross-over module is a combination circuit of microcontroller (PIC877A) and ultrasonic sensors along with the wireless module (ESP8266EX) [16]. I have a question though, is there any way one can control the board my a mobile phone?. There are a few useful functions and operators that come in handy when you want to convert or spit a string and convert it to a decimal and so on. My modules have www.hc01.com HC-12 v2.6. Receiving sensitivity is from -117dBm (0.019pW) to -100dBm (10pW). Technical storage or access is necessary to create user profiles, to send advertisements, or to track the user on a website or across multiple websites for similar marketing purposes. A 12 volt, 7 Ah battery is used as a source to . Question //Device address in which is also included the 8th bit for selecting the mode, read in this case. Std Edition. The circuit has 2 transducers one for emission and one for reception. You press a button once to turn on the LED and press the same button again to turn of the LED. Now you can open a serial monitor for each of them. The default. As an introduction, we take the modified SoftwareSerial sketch from the examples of the Arduino IDE. But in urban areas with lots of buildings you might reach only a few hundred meters. Copy and paste the contents of the file named HC-12 AT Commander.txt from the ZIP archive and upload to your Arduino. About: I like to make stuff in my free time. This is optional. The principle is very simple. The maximum range is 1.8 kilometers in open space. This DHT sensor has a response time of 2 seconds, so we have to time it before reading to obtain more stable values. Then we rotate the stepper motor to the current angle. to use Codespaces. */. After assembling the base and sensor circuits, we will program them. The other line we will need to use, is digitalWrite(5, LOW) as this controls whether the module is in its settings mode, or in the usual operation mode. With the first while loop we store the incoming data into a String variable, so we can better handle it. thanks..!! Here is the line we add: #define LED_BUILTIN 2 Put this above the Setup() function at the top of your code: Once you have addedthis, go to Tools, Board and make sure the ESP32 Dev Module is selected. I don't want to go to deep into this subject. In addition, the range is even shorter if you reduce the transmission power to the level permitted in Germany. Make sure when you order that the male and female connections match. If the device is working, you should see the work OK appear in the terminal window. If this instructable was helpful for you, please click the favorite button and subscribe. Then we convert the value to integer, and map the value from 0 to 1600 steps, which corresponds to the selected sixteenth step resolution at the A4988 stepper driver. Tutorials, Tips, Tricks, How It Works, Projects, Examples, Source Codes, Download files and much more can be found here. I had only 470 F in my stock. To enter AT mode, all you have to do is connect SET to GND. But maybe now I have found the issue. It is followed by a parity bit or none (non parity). The connections appear to be the same for all HC-12 modules. Example: type AT+B4800. However, the HC-12 module transmits at 100mW in the default settings. Replies to my comments Hi Givi, you have connected the SET pin to D5. Every 3 seconds we receive the measurements taken by the sensor. Dejan. You have chosen FU4 and in that mode only a baud rate of 1200 is allowed. First, we put the TX vector inside a repeat command so that the vector can be traversed and so all the values inside the vector can be sent using the HC12.write command. Doesnt matter. For entering the AT command mode we just have to set the Set pin of the module to a low logic level. Go back to the Arduino terminal to check the IP address of the Hub, then type this address into the edit box in the your app. Thank you for the pointer, that does make sense. */, // Microswitch input, with internal pull-up resistor activated, // Reads the data between the start "s" and end marker "e", // Checks whether the received message statrs with the start marker "s", // Makes sure it uses angles between 0 and 180, // Convert angle value to steps (depending on the selected step resolution), // A cycle = 200 steps, 180deg = 100 steps ; Resolution: Sixteenth step x16, //Serial.println(currentAngle); // Prints the angle on the serial monitor, // Enables the motor to move in a particular direction, // Rotates the motor the amount of steps that differs from the previous positon, Its wireless working frequency band is from 433.4 MHz to 473.0 MHz, It has a total of 100 channels with a stepping of 400 KHz between each channel, Transmitting power is from -1dBm (0.79mW) to 20dBm (100mW). Figure 4 - Termite software with response to the AT command.. The L298N is a dual H-Bridge motor driver which allows speed and direction control of two DC motors at the same time. You can download the schematic in PCBGOGO Download Link. $2 Arduino. So, I assume there is no check. For both Arduinos we connect pin 2 to TX and pin 3 to RX. This is only a fraction of the 600 meters indicated above. Um dir ein optimales Erlebnis zu bieten, verwenden wir Technologien wie Cookies, um Gerteinformationen zu speichern und/oder darauf zuzugreifen. Yes its possible even with a single arduino but you have to use hc05 bt module (which will not give such a high range as hc12). The link to the sma antenna is broken..could you be so Kind to indicate one antena model? We and our partners share information on your use of this website to help improve your experience. As for the value you can use anything from 0.1 to 10uF. To transmit the ultrasonic pulses a relatively high voltage is needed. master. - The output data is Two's complement That done we check if the values are incorrect using an if condition. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. - X1 as the most significant byte */, // Xa = output value from -1 to +1, Gravity acceleration acting on the X-Axis, // Combine X and Y values for getting the angle value from 0 to 180 degrees, // Makes 100 accelerometer readings and sends the average for smoother result, // Some more smoothing of acceleromter reading - sends the new angle only if it differes from the previous one by +-2, //sends the angle value with start marker "s" and end marker "e", /* Arduino Long Range Wireless Communication using HC-12 Wenn du deine Zustimmung nicht erteilst oder zurckziehst, knnen bestimmte Merkmale und Funktionen beeintrchtigt werden. Well try to use an external 5V power supply, the Arduino 5V might not be enough for your module. Therefore, through this article you will learn: Now, we will start the complete presentation of the development of the Remote Device Control project using the HC 12 module and the PCBGOGO Printed Circuit Board. In Chinese shops it is again much cheaper, but you have to accept a few weeks delivery time there. (4) Upload the new codes and check that the setup is working. // Bit D3 High for measuring enable (0000 1000), // Ends the transmission and transmits the data from the two registers, // Request the transmitted two bytes from the two registers, /* Converting the raw data of the X-Axis into X-Axis Acceleration To transmit temperature and humidity measurements, we use the Serial.write command in the HC 12.write case. I also soldered some pins on the HC-12 module to make it easy to use on a breadboard. You can download the schematic in PCBGOGO Download Link. It is possible to connect two types of antennas in this module, a helical antenna that comes with the module or another antenna to be connected to the UFL connector. To configure the module, the set pin must be connected to the GND as shown in figure 1 for the module to enter configuration mode. The first image is what you should see. After receiving this data, it is necessary to convert these values to the correct measured value. To configure the module, the set pin must be connected to the GND as shown in figure 1. The module is really compact lightweight and breadboard-friendly which makes this the best wireless controller for our project. In Arduino Uno, we will have the B0 button connected to digital pin 2 of Arduino Uno and the B1 button connected to digital pin 3 of Arduino Uno. AT+Cxxxx Change wireless communication channel, from 001 to 100. Your email address will not be published. Figure 7 - Termite software configuring the operation mode of the HC 12 module. So, first we need to define the pins and set the Set pin to high logic level in order the module to work in normal, transparent mode. We use the next while loop to print the response message from the HC-12 module whether the channel has been successfully changed. From here you can change the settings, but for now leave them as they are. This mode is designed to achieve long ranges of up to 1800 meters. The HC12 is a 434Mhz radio device with a serial interface. Hi Tom, I have call today heureka! You can access the download link and download the assembly files and schematics. At the base is an Arduino Uno with an LCD display to display the data measured with the sensor. Select the port of the second Arduino and upload the sketch to the second Arduino as well. Available baud rates: 1200 bps, 2400 bps, 4800 bps, 9600 bps, 19200 bps, 38400 bps, 57600 bps, and 115200 bps. The HC-12 modules should be connected in the following way. The module changes (at least mine does it) to baud 1200 automatically. protocol like power consumption, throughput measurement, degree of coverage etc., we are using the Hc-12 transceiver module in the agriculture field. To work with 2 Arduinos on 1 computer, we have to open 2 instances of the Arduino IDE. As previously mentioned, the project consists of creating a system for remote monitoring of two quantities: temperature and humidity and remote actuation of actuators. Dear Wolfgang; wowwww nice tutorial indeed. Thank you for your answer The circuit also contains a microswitch for finding the initial position of the stepper motor at 0 degrees. The HC-12 module has the four radio modes: FU1, FU2, FU3 (default) and FU4: FU1 is a moderate power saving mode. What this program does, is read anything that is typed in the Serial Monitor, and send that to the HC-12 Module, and read anything the HC-12 module sends and writes that to the Serial Monitor. (check for male and female). Learn more about the CLI. on Introduction, Where the code link doesn't work at least on Google, What changes should I make in the code to actuate two receivers at the same time with a single transmitter for the same application, Hi !I've been trying make this led glow when I press the momentary button.I've checked the connections.I've used the same code that you've used.But still I can't get the result.The messenger code works fine.But I'm getting problems when I upload this led code.I'm very stressed.I've just got 3 days to complete this.What should be the problem?Pls help if you can, Reply Each iteration, using the HC12.read() function we will read each incoming byte or character and add it to the String variable named readBuffer. The HC-12 radio module is available in online shops for 6 to 9 euros. An important future improvement to this code is to implement a proper communication The capacitor ensures that the sudden, high power can be supplied when sending. Especially programming, cooking, electronics etc. I would now skip ahead to the tutorial Step 8 and test the board with a Blink Sketch. The HC-12 module has a microcontroller which actually doesnt have to be programmed by the user. While I am receiving data through the HC12 module I store these values in the RX vector up to position 4. I have changed the link. Thus, only channels 1 to 4 are allowed (and again: if you are in Germany). I measured even less, the consumption periodically fluctuated between 23 and 80 A. Heres the Arduino code for the first example, a basic communication between the two modules using the Serial Monitor. An important future improvement to this code is to implement a proper communication protocol such as XMODEM or HDLC. Hi Wolfgang, While pushing the button, the LED lights up. If a parity bit sent, you can choose whether to check for even or odd parity. Download the schematic in PCBGOGO Download Link. A MAX232 (U3) is cleverly used to produce +/-10V (which are the normal USART voltages) from 5V . Changed schematics (was for AT command mode). But your Android device does not talk 434Mhz radio. to turn left or right, only one side motors run and other side motor should move in opposite direct but keeps standing. The transistor buffer driver is still required in . Wenn du diesen Technologien zustimmst, knnen wir Daten wie das Surfverhalten oder eindeutige IDs auf dieser Website verarbeiten. Attach a big capacitor to the power supply. Please let me know . And add a storage capacitor between PSU + and - to balance ripple. The HC 12 module is a radio transceiver and its operating frequency is 433.4 MHz to 473 MHz. For now we are leaving out the HC-12 setup code as until we have another device to talk to it is not needed. So if we press the first push button, using the HC12.print() function we will send the string AT+C001 to the HC-12 module or to the second Arduino. The following table shows which baud rates you can set for communication with the HC-12 module. This means that we have to open the Arduino software 2 times. The HC-12 manual recommends a diode placed in the +ve lead to device if operating at 4.5 volts continuously. Thank you for getting back with me on this. Optionally, a HC-12 serial link can be added or substituted for the HC-05 Bluetooth module. A tag already exists with the provided branch name. And with the good antenna, I could achieve 350 meters. I have scanned the NET found none..!!! The values coming from the accelerometer can sometimes be unstable or shake, so for smoothing the result I used the average value of one hundred readings. Every number is a 400KHz step. When starting to use a new device, it is always a good idea to test it first using a very simple sketch, for this we will use the Blink Sketch (Check that your ESP32 board has a built in LED, if not skip this step). As previously mentioned, the project consists of creating a system for remote monitoring of two quantities: Figure 1 - Schematic circuit with the serial converter connections to the HC 12 module. The Attiny85 in sleep mode uses 0,06 mah, but the HC-12 at the minimum settings uses 3,5mah. I also have connected it the circuit I have published but in the text I say that the SET Pin is not needed at this stage. and hooked up the wires by pin number rather than by your schematic, everything worked great. Hi Peter, Thanks for noticing that the link goes to a spam page. On some of the newer ESP32 boards, you need to hold the boot button to get it to program. The transmitter providing the data (server) converts the data using String(Zahl) into strings that are linked together, but separated by non-numbers (asterisks in this example). After configuring both modules, we can connect to the Arduino as shown in figure 8 for the base and figure 9 for the sensor. Let's take a closer look at the pinout of L298N module and explain how it works. The sketch sends fixed values. Then, the HC12 module will transmit this information to the receiver HC 12 over the air via through electromagnetic waves. A complete guide, https://www.facebook.com/OfficialTomHeylen, How to Make a Voltaic Pile - the World's First Battery, AI-assisted Pipeline Diagnostics and Inspection W/ MmWave, ECLIPSE - the Ring Lamp With Progressive Lighting, IR Controlled. The HC-12 is a half-duplex wireless serial communication module with 100 channels in the 433.4-473.0 MHz range that is capable of transmitting up to 1 km. 3. The domainname has expired and it seems that traffic get redirected to advertising. Example: Send AT+B38400 to module, and the module returns OK+B19200. Its wireless working frequency band is 433.4-473.0MHz. The recipient sketch checks to see if a message has been sent. I just want the arduino codenot gps download files and other stuffCAN YOU PLEASE insert a PDF of the arduino sketches !!!!! The code should work fine. First, we included the serial software library to be able to use any digital pin as a TX or RX pin to be used as a data transmitter. 2 years ago I was able to combine modules with SI4463 and SI4438 transceivers, but others report problems. Did you make this project? Hey, thanks! - X0 as the least significant byte KoiBoard - Fully Customizable Mechanical Keyboard With a Koi. If package is not well received it is sent again. After making the settings in the void setup function, go to the void loop function, which is where the logic of our program is. In that case, once we connect the first Arduino to the computer, we need to select the model and the COM port and upload the code to the Arduino. Follow the rest of this instructable to find out how easy it is to become a pro in wireless serial communication. Dear Dejan, And have you left the setting mode (SET unconnected or connected to HIGH Level)? Make sure that nothing can short out or easily become disconnected. Download the schematic in PCBGOGO Download Link. In principle, I have already explained above how it works. yes, thats normal for SoftwareSerial. Apparently, the module goes intermittent into sleep mode. Example: Send AT to module, and the module returns OK. AT+SLEEP After receiving the command, the module enters sleep mode after exiting from AT, the working current is about 22A, and this mode doesn't allow . If nothing happens, download GitHub Desktop and try again. */, // ==== Storing the incoming data into a String variable, // Add each byte to ReadBuffer string variable, // ==== Sending data from one HC-12 to another via the Serial Monitor, // ==== If button 1 is pressed, set the channel 01, // Send the AT Command to the other module, // Wait for the HC-12 to enter AT Command mode, // If HC-12 has data (the AT Command response), // ==== If button 2 is pressed, set the channel 02, // ==== Custom function - Check whether we have received an AT Command via the Serial Monitor, // Check whether the String starts with "AT", /* Arduino Long Range Wireless Communication using HC-12 August 16, 2019 at 9:45 pm . This is not the same as file New. Now, we will start the complete presentation of the, Developing the Project Remote Reading of Temperature and humidity using the HC12 Module. I use: We can now connect it to the ESP32 as follows: To make it a bit neater and easier to use without damaging the connections, were going to put the ESP32 and HC-12 module inside an enclosure. - Describe data handling instructions. The technical storage or access that is used exclusively for statistical purposes. In this article, we will learn how to create a PCBGOGO Printed Circuit Board and use the HC 12 radio transceiver/module with an Arduino Nano with a DHT 11 temperature and humidity sensor that will be the sensor and an HC 12 with the Arduino Uno that will be the base. In the code block below, we define the objects, libraries, and pin definitions with names to be used throughout the code. Cheers. Antoine. the connection is lost at 10 meters. The HC-12 Module is a serial radio transceiver module that we will be using to communicate with the different remote nodes in our system. In the void loop function, we read the buttons using digitalRead and if the B0 button is pressed, it will send the value 1 to the HC 12 module. Thanks and regards, 2. In my house I could easily send messages through two walls and a ceiling using FU3 / 9600 Baud / Spiral Antenna / Powerlevel 4. As for tampering, I dont have much info on that but I dont believe that this cheap module can provide high security. Alternatively, you connect SET to an I/O pin and set it to OUTPUT and LOW. I would not screw it in yet, as you may find (as I did) that the ESP32 module is one of the ones that requires the BOOT button to be pressed in order to program. If you want to know more about the rules for radio use (in Germany), then I recommend this link to an easy-to-understand summary. The data packages should not exceed 60 bytes and there should be a pause of 2 seconds between sending two packages. If you disconnect it from GND again or switch the I/O pin to INPUT, it returns into normal radio mode. This might be confusing. So dont rejoice too soon. In the next tutorial, we will build a remote-controlled relay module. Copy the content from the file HC-12 messenger send/receive.txt in the ZIP archive and paste it to each of the Arduino instances. Example 02 - Changing channels using push buttons - Buttons side In the same way we, using the pushing the second button, we set the communication channel number two. Feel free to ask any question in the comments section below. The GND of the USB-SERIAL converter must be connected to the GND of the power supply. The RF side of the board is a Silicon Labs Si4463 IC and the CPU side is a STMicroelectronics 8S003F3P6 STM8 chip.
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