Trouble using AT commands with HM-10

Community General Discussion
1

I have been trying to set up communication between 2 HM10s. I have the HM10 wired straight to the arduino (via breadboard) simply to 5V, GND, TX1 and RX0. The arduino has been flashed with a blank code, but for whatever reason when I go to use command AT, I don’t get an OK back. I have ensured that the wiring is not faulty and I am on the correct baud rate. Any thoughts on how to correct this?

2

What code? Please post it here.

Tx to Rx and Rx to Tx ?

3

The code is just the empty template that you get when you load up arduino ide

void setup()
{

}

void loop() 
{

}

And yes, I have the RX to TX and TX to RX.

4

Not sure how you expect that code to reply ?

You need to be checking data received, and then sending it back.

5

Even AT commands won’t work in the serial monitor?

6

Because you have no code to handle them. You need to read them and write them.

7

So how would I go about setting the board to slave/master mode? I've tried pretty much everything I've found online.

8

Assuming the module runs at 9600 baud.

Connect

  • Tx to GPIO 10 (Rx)
  • Rx to GPIO 11 (Tx)
  • GND to GND
  • 5v to 5v

Set baud rate to 9600 in the monitor.

Use this sketch...

#include <SoftwareSerial.h>

#define BAUD 9600

SoftwareSerial softSerial (10, 11);  // Rx, Tx as required.


void setup()
{
  Serial.begin(BAUD);
  softSerial.begin(BAUD);

  Serial.print("Ready @ ");
  Serial.print(BAUD);
  Serial.println(" baud");
}


void loop()
{
  while (Serial.available() > 0)
    softSerial.write(Serial.read());

  while (softSerial.available() > 0)
    Serial.write(softSerial.read());
}