I am trying to make a remote control car, but I am have issues trying to get my HC-12s to communicate. The main board is a Mega, and the remote is currently a Uno, but will soon-ish be a Nano. I currently have them both connected to separate laptops, with the latest IDE install on both. Originally They both had the same code:
#include <SoftwareSerial.h>
SoftwareSerial HC12(10, 11);
void setup() {
Serial.begin(9600);
HC12.begin(9600);
pinMode(13, OUTPUT);
pinMode(12, OUTPUT);
digitalWrite(12, HIGH);
}
void loop() {
while (HC12.available()) {
Serial.write(HC12.read());
digitalWrite(13, HIGH);
delay(10);
digitalWrite(13, LOW);
}
while (Serial.available()) {
HC12.write(Serial.read());
}
}
But after doing some research, I found out that I don't need to have software serial on the Mega, so I changed the code to:
byte rx_byte = 0;
void setup() {
Serial.begin(9600);
Serial3.begin(9600);
pinMode(12, OUTPUT);
digitalWrite(12, HIGH);
}
void loop() {
if (Serial.available()) {
rx_byte = Serial.read();
Serial3.write(rx_byte);
}
if (Serial3.available()) {
rx_byte = Serial3.read();
Serial.write(rx_byte);
}
}
On the Uno, I have pin setup:
| Uno | HC-12 |
|---|---|
| GND | GND |
| Pin 12 | Vcc |
| Pin 11 | Rx |
| Pin 10 | Tx |
On the Mega, I have pin setup:
| Mega | HC-12 |
|---|---|
| GND | GND |
| Pin 12 | Vcc |
| Pin 14 | Rx |
| Pin 15 | Tx |
The issue is when I try to send with the Mega, either the Uno doesn't show what was sent, or the Mega doesn't send properly. I tried to change the port, with the 'AT+' command, and I didn't see the 'OK+' message, so I think the issue is with the Mega/that chip. Any help would be greatly appreciated.