HM-10 doesn't responde to Arduino

Projects Networking, Protocols, and Devices
1

Hi guys,
I'm using Arduino Nano R3(old bootloader) and Serial(D1 and D0 pins).

Arduino -> HM-10
5V -> 5V
GND -> GND
RX -> TX
TX -> RX with (1k/2k voltage divider)

Code is below

#include <Arduino.h>

void setup()
{
	delay(100);

	Serial.begin(115200);
	pinMode(13, OUTPUT);
}

void loop()
{
	Serial.println("0|15|2|100");
	digitalWrite(13, !digitalRead(13));
	delay(2000);
}

Baud rate on HM-10 is 115200bps, so that is not problem. I've connected with my phone and I don't see any data from Arduino Nano, but if I send command from phone(eg. AT+VERS) I get V703. AT respondes with AT+OK.
Where is the problem?

2

Have you done a search for "arduino HM-10"? When I do I see that there are libraries that are used. The code you posted does not interact, as I can see, with a HM-10.

3

Idahowalker:
Have you done a search for "arduino HM-10"? When I do I see that there are libraries that are used. The code you posted does not interact, as I can see, with a HM-10.

There is no need for library. Most examples use Software serial so they can use Serial for printing code on PC. I don't need that. I need to send data from Arduino to phone via hardware serial.

Same code works with STM32F103C8 board.

4

You need to make your connections RX-TX, TX-RX to communicate between the Arduino and the HM-10. The reason is that RX stands for "receive" and TX stands for "transmit".

5

pert:
You need to make your connections RX-TX, TX-RX to communicate between the Arduino and the HM-10. The reason is that RX stands for "receive" and TX stands for "transmit".

I know that. Its connected RX from Arduino to TX from HM-10. TX from Arduino to RX from HM-10(via 1k/2k voltage divider). I see data from Serial on PC(when I connect Arduino Nano with USB cable). But HM-10 doesn't transmit(or even recive) data when using external power supply instead of USB cable.

Now I guess it is only possible to use Hardware Serial for sending data to PC.

6

Lol
Just found where the problem was.
Back in days when I've used Nano boards, I bend VIN and TX pins. Because of breadboard I had to cut it. I forgot for that. My bad. Sorry guys.