HC 12 Uart Transciever Code for controlling 4 LEDs
/*By Roee Bloch
*HC-12 Moule Transciever Same code is for Transmitter and Receiver, setup through A4 Input
*Tested on Arduino Nano
* This SW is for Transmitter & Receiver, the choise is done by reading A4 & A5 inputs (analog inputs)
* A4=1=> TX, A4=0=>RX
* A5=1=>LATCH, A5=0=>Momentary this feature doesn't work in this version so this is latch only!
*
* NANO connections to HC-12 As follows:
* ARDUINO NANO HC-12-MODULE
* _________________________________________________________________________
* 5V -> 1N4148 Anode, 1N4148 catode -> HC-12/Pin-1 (VCC)
* GND -------> GND
* D11 -------> RXD
* D10 -------> TXD
*
* NANO (TX MODULE) NANO (RX MODULE)
* ______________________ ________________________________
* D2 --> SW --> GND (SW1) A4 --> GND
* D3 --> SW --> GND (SW2) D2 --> OUTPUT 1
* D4 --> SW --> GND (SW3) D3 --> OUTPUT 2
* D5 --> SW --> GND (SW4) D4 --> OUTPUT 3
* D5 --> OUTPUT 4
*/
#define P1 2
#define P2 3
#define P3 4
#define P4 5
#include <SoftwareSerial.h>
SoftwareSerial mySerial(10, 11); // RX, TX
char latch; // , if latch=1 then Latch
int read_A4, read_A5, i, read_P1, read_P2, read_P3, read_P4;
int TX_CODE, RX_READ, mode, TX_CODE_OLD; //if mode= 1 then TX
int RP1, RP2, RP3, RP4;
volatile byte SW1 = 0, SW2 = 0, SW3 = 0, SW4 = 0;
boolean S1, S2, S3, S4;
byte TEST;
char s, TXTOSEND;
int FLAG=1;
void setup() {
Serial.begin(9600);
mySerial.begin(9600);
Serial.println("Hello HC-12 TX and RX SW, A4-Low=TX A4-HIGH=RX A5-LOW=Momemtary A5-HIGH=LATCH");
// mySerial.println("Hello HC-12 TX and RX SW, A4-Low=TX A4-HIGH=RX A5-LOW=Momemtary A5-HIGH=LATCH");
// This is for internal pull ups resistors on A4 and A5 Inputs
pinMode(A4, INPUT_PULLUP);
pinMode(A5, INPUT_PULLUP);
delay(500);
read_A4 = analogRead(A4);
read_A5 = analogRead(A5);
if ((read_A4) > 500) {
mode = 1;
Serial.println("TX Mode");
}
else
{
mode = 0;
Serial.println("RX Mode");
}
if ((read_A5) > 500) {
latch = 1;
Serial.println("LATCH Mode");
}
else
{
latch = 0;
Serial.println("Momentary Mode");
}
if (mode == 1) // TX
{
pinMode(P1, INPUT); // set pin to input
digitalWrite(P1, HIGH); // turn on pullup resistors
pinMode(P2, INPUT); // set pin to input
digitalWrite(P2, HIGH); // turn on pullup resistors
pinMode(P3, INPUT); // set pin to input
digitalWrite(P3, HIGH); // turn on pullup resistors
pinMode(P4, INPUT); // set pin to input
digitalWrite(P4, HIGH); // turn on pullup resistors
}
else
{
pinMode(P1, OUTPUT); // set pin to input
digitalWrite(P1, LOW); // turn on pullup resistors
pinMode(P2, OUTPUT); // set pin to input
digitalWrite(P2, LOW); // turn on pullup resistors
pinMode(P3, OUTPUT); // set pin to input
digitalWrite(P3, LOW); // turn on pullup resistors
pinMode(P4, OUTPUT); // set pin to input
digitalWrite(P4, LOW); // turn on pullup resistors
}
}
void loop() {
if (mode == 1) //TX Mode
{
TX_MODE();
}
else
{
RX_MODE();
}
}
void TX_MODE()
{
while (1)
{
{
read_P1 = digitalRead(P1);
read_P2 = digitalRead(P2);
read_P3 = digitalRead(P3);
read_P4 = digitalRead(P4);
TX_CODE = 64 + (read_P1 * 1) + (read_P2 * 2) + (read_P3 * 4) + (read_P4 * 8); // converting TX to one char
TXTOSEND = TX_CODE; // conver to char for sending OK
if (FLAG==0) // skip first time on FLAG=1
{
if (TX_CODE != TX_CODE_OLD) // transmit only on change
{
Serial.print(TX_CODE, BIN);
mySerial.print(TXTOSEND);
}
delay(100);
TX_CODE_OLD = TX_CODE;
}
else FLAG=0;
}
}
}
void RX_MODE()
{
while (1)
{
if (mySerial.available()) {
// read the incoming byte:
RX_READ = mySerial.read();
TEST = RX_READ;
RP1 = (TEST) & (1);
RP2 = (TEST) & (2);
RP3 = (TEST) & (4);
RP4 = (TEST) & (8);
mySerial.flush();
// When button is pressed (logic 0) toggling the apropriate LED
if (RP1 == 0) SW1 = ~(SW1);
if (RP2 == 0) SW2 = ~(SW2);
if (RP3 == 0) SW3 = ~(SW3);
if (RP4 == 0) SW4 = ~(SW4);
//convert to bit for Digital-Out from Arduino
S1= SW1 & 1;
S2= SW2 & 1;
S3= SW3 & 1;
S4= SW4 & 1;
digitalWrite(P1, S1);
digitalWrite(P2, S2);
digitalWrite(P3, S3);
digitalWrite(P4, S4);
delay(100);
Serial.print("S1=");
Serial.print(SW1);
Serial.print(" S2=");
Serial.print(SW2);
Serial.print(" S3=");
Serial.print(SW3);
Serial.print(" S4=");
Serial.println(SW4);
}
}
}
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Link to USB to UART for Configuring the Module on Ebay: USB FT232 Dual Voltage configuration
Link to Manual: Manual PDF