Long range, 1.8km, Arduino to Arduino wireless communication with the HC-12 

Same thing happened to me, i tried with a mega and 2 Unos and even ordered brand new HC-12s and tried those and nothing works

have you guys figured out the solution of this problem?? because i am also facing same problems and wasted my 2-3 days on order to rectify the issue but nothing has worked

The Problem is: You are an idiot.

@@BioSniperX bhai main bhi ye banana chahta hu. Hc12 mehanga h. Agar bhai aapka ban gya ho to please bta do. Phir main bhi purchase kr lun ga

module works fine on 5v for a long period. I have modules working for years continues on 5v

+Tom Heylen thank you very much for your quick answer

No, you cant use HC-12 to connect Wifi or Bluetooth

Some of the people in this forum had a range up to 10 miles in open area. Concrete walls and buildings will make this range shorter. I found that in a building I can receive up to 4 floors. Have a good one. Cheers

www.banggood.com/?p=FA25224129409201603Q

I have been testing the sma and the spring antenna in an urban area and it does not seem to be much different.

I found some code I wrote for a remote controlled drone working with the HC-12 modules. SENDING CODE #include SoftwareSerial mySerial(4, 5); //RX, TX //#### varialbles for potentiometers, handles ########## int potUpDown = 1; // analog pin used to connect the potentiometer int potLeftRight = 0; // analog pin used to connect the potentiometer int valUpDown; int valLeftRight; String strValUpDown; String strValLeftRight; //#### variables for accelerometer ############ int yPin = A3; int xPin = A2; int xValue = 0; int yValue = 0; int xD = 0; int xU = 0; int yL = 0; int yR = 0; String strXValue; String strYValue; int buttonPin = 12; int buttonState = 0; boolean checkButtonState = 0; boolean mapValues = 1; void setup() { Serial.begin(9600); mySerial.begin(9600); Serial.setTimeout(10); mySerial.setTimeout(10); pinMode(buttonPin, INPUT); } void loop() { //########## code for potentiometers, handles ################# valUpDown = analogRead(potUpDown); // reads the value of the potentiometer (value between 0 and 1023) valLeftRight = analogRead(potLeftRight); valUpDown = map(valUpDown, 370, 638, -4, 96); valLeftRight = map(valLeftRight, 397, 600 , -50, 50); strValUpDown = String(valUpDown); strValLeftRight = String(valLeftRight); //########## code for accelerometer ################ buttonState = digitalRead(buttonPin); if (buttonState == HIGH) { checkButtonState = 1; xValue = analogRead(xPin); yValue = analogRead(yPin); if(checkButtonState == 1 && mapValues == 1){ mapValues = 0; xD = xValue - 65; xU = xValue + 65; yL = yValue - 68; yR = yValue + 68; } xValue = map(xValue, xD, xU, -50, 50); //difference is 130 yValue = map(yValue, yL, yR, -50, 50); //difference 136 strXValue = String(xValue); strYValue = String(yValue); } else { checkButtonState = 0; mapValues = 1; strXValue = "0"; strYValue = "0"; } //read figures in serial monitor Serial.print("handle up/down" + strValUpDown); Serial.print(" handle left/right" +strValLeftRight); Serial.print(" acc up/down " + strXValue); Serial.println(" acc left/right" + strYValue); mySerial.print(":" + strValUpDown + "," + strValLeftRight + "," + strXValue + "," + strYValue + ";"); mySerial.flush();//Waits for the transmission of outgoing serial data to complete. delay(50);//allow some time for the serial buffer } /* int checkLeftRight = 0; int checkUpDown = 0; boolean set; void setup() { } void loop() { RECEIVING CODE #include SoftwareSerial mySerial(3, 4); //RX, TX //4 leds int ledFrontLeft = 11; int ledFrontRight = 10; int ledBackLeft = 9; int ledBackRight = 6; void setup() { Serial.begin(9600); mySerial.begin(9600); Serial.setTimeout(10); mySerial.setTimeout(10); //declare led pins to be output pinMode(ledFrontLeft, OUTPUT); pinMode(ledFrontRight, OUTPUT); pinMode(ledBackLeft, OUTPUT); pinMode(ledBackRight, OUTPUT); } void loop() { if(mySerial.available()){//Read from HC-12 and send to serial monitor //traversing trough the serial input //date sent is a continues stream of ":updownvalue,leftrightvalue,accUpdownvalue,accleftrightvalue;..." mySerial.readStringUntil(':');//is string start character Serial.read();//skip start character String handleUpDown = mySerial.readStringUntil(',');//read first value Serial.read();//skip separator String handleLeftRight = mySerial.readStringUntil(',');//read second value Serial.read();//skip separator String accUpDown = mySerial.readStringUntil(',');//read 3th value Serial.read();//skip separator String accLeftRight = mySerial.readStringUntil(';');//Read 4th value Serial.read();//skip string stop character //Convert values to integers int intHandleUpDown = handleUpDown.toInt(); int intHandleLeftRight = handleLeftRight.toInt(); int intAccUpDown = accUpDown.toInt(); int intAccLeftRight = accLeftRight.toInt(); intHandleUpDown = map(intHandleUpDown,0,100,0,255); intHandleLeftRight = map(intHandleLeftRight,-56,53,0,255); intAccUpDown = map(intAccUpDown,-50,50,0,255); intAccLeftRight = map(intAccLeftRight,-50,50,0,255); //speed float accLeft = 0; float accRight = 0; float accUp = 0; float accDown = 0; float handleLeft = 0; float handleRight = 0; //split value in half. left right and up down. if(intAccLeftRight < 117 && intAccLeftRight > 0){ accLeft = map(intAccLeftRight, 117, 1, 100, 1); } if(intAccLeftRight > 137 && intAccLeftRight < 255){ accRight = map(intAccLeftRight, 137, 254, 100, 1); } if(intAccUpDown < 117 && intAccUpDown > 0){ accDown = map(intAccUpDown, 117, 1, 100, 1); } if(intAccUpDown > 137 && intAccUpDown < 255){ accUp = map(intAccUpDown, 137, 254, 100, 1); } if(intHandleLeftRight < 128 && intHandleLeftRight > 0){ handleLeft = map(intHandleLeftRight, 128, 1, 100, 1); } if(intHandleLeftRight > 148 && intHandleLeftRight < 256){ handleRight = map(intHandleLeftRight, 148, 255, 100, 1); } //calculate and write values to led's if(intHandleUpDown < 10){ analogWrite(ledBackLeft, 0); analogWrite(ledBackRight, 0); analogWrite(ledFrontLeft, 0); analogWrite(ledFrontRight, 0); }else{ float valFrontLeft = intHandleUpDown; float valFrontRight = intHandleUpDown; float valBackLeft = intHandleUpDown; float valBackRight = intHandleUpDown; if(accLeft != 0){ valFrontLeft = valFrontLeft/100*accLeft; valBackLeft = valBackLeft/100*accLeft; } if(accRight != 0){ valFrontRight = valFrontRight/100*accRight; valBackRight = valBackRight/100*accRight; } if(accUp != 0){ valFrontLeft = valFrontLeft/100*accUp; valFrontRight = valFrontRight/100*accUp; } if(accDown != 0){ valBackLeft = valBackLeft/100*accDown; valBackRight = valBackRight/100*accDown; } if(handleLeft != 0){ valFrontRight = valFrontRight/100*handleLeft; valBackLeft = valBackLeft/100*handleLeft; } if(handleRight != 0){ valFrontLeft = valFrontLeft/100*handleRight; valBackRight = valBackRight/100*handleRight; } analogWrite(ledBackLeft, valBackLeft); analogWrite(ledBackRight, valBackRight); analogWrite(ledFrontLeft, valFrontLeft); analogWrite(ledFrontRight, valFrontRight); } Serial.print(intHandleUpDown); Serial.print(","); Serial.print(intHandleLeftRight); Serial.print(","); Serial.print(intAccUpDown); Serial.print(","); Serial.println(intAccLeftRight); } mySerial.flush(); Serial.flush(); delay(20); }

Hi, it doesn't work with bluetooth. You need a bluetooth module for that but the range is not great. Maybe about 20 meters.

+Tom Heylen yes, I am using HC05 Bluetooth module but it don't work more than 10 meters, actually I want data in my android phone and data has to travel from far of place so I am looking for alternative to that.

You have to translate the data over your HC-12 links by using arduino controllers.

tx should go to rx and rx to tx. You can set the pins in the code. Thanks for noticing. Have a great day!

@@TomHeylen1 Thanks Tom.. So when the code defines "TX" does that mean it's TX pin on Arduino to be connected to RX pin on HC12 and RX pin on Arduino connected to TX pin on HC12" (10, 11) means TX and RX defined on Arduino.. This is confusing some people including me. And if it's backwards, does it harm the HC12 in any way.. Because I can't get these simple things to transmit or give me a response when I use AT commands. Again thanks for clearing that first part up for me Tom.

Double checked all wires btw, wasn't the problem

is this distance achieved in open area or indoors?

I have encountered a problem where i cannot get more than 4m range with HC12 modules with small spring type antenna which was enclosed in the module, I did tried all the settings but no luck! Appreciate any help.

Are the examples from the video working? If yes, should be fine. If not, watch the video again. You have a great day.

You can use multiple senders to receive with one ore more receivers. You have to encode/decode your messages sent/reveived to verify you have the right message from the right sender. So yes you can :) Have a good one and enjoy your project. Cheers

I agree alot of people needlessly waste resistors and such by not learning about input_pulldown

Pullup*

You can even use a map function, for example: x=map(y,0,1,1,0);and now when u press the button, it will turn on the LED(for example)like a normal button; Moreover, you can continue your code normally without any confusion(if u had a huge code).