I am working on an Arduino and esp8266 project and I am facing a problem that after uploading following code nothing is showing on serial monitor. I am using USB connector to power up the Arduino then connected Esp8266 with it by connecting all 6 wires. I bypass the Arduino by connecting reset with ground. There is no error while uploading code but its showing nothing. Tried connecting esp8266 TX with Arduino RX and esp RX with Arduino TX. And TX with TX and RX with RX also but still hard luck. Baud rate is same 115200 port is also correct but still not working. Kindly help me to figure it out ! Thanks
PS: I attached the schematic, kindly check that.
void setup() {
Serial.begin(115200);
while(!Serial) { delay(100); }
}
void loop() {
Serial.println("Hello!");
delay(1000);
}
Related
I hope you can help me because I'm already desperate. After several failed attempts with the SIM800L, I have changed the GSM/GPS module for the A9G and I have an arduino Mega.
The problem I have is that I try to communicate with the A9G through the arduino but it is impossible... Through a TTL I have succeeded, but not with Arduino. I have connected the Tx and Rx pins of the A9G module to the 19 and 18 of my arduino Mega. I feed the A9G with a 3.7V and 820mAh battery through the VBat connector of the module and I have connected the grounds of the module and Arduino. I have used the following program:
void setup()
{
//Begin serial communication with Arduino and Arduino IDE (Serial Monitor)
Serial.begin(9600);
//Begin serial communication with Module
Serial1.begin(38400);
Serial.println("Initializing...");
delay(10000);
}
void loop()
{
updateSerial();
}
void updateSerial()
{
delay(500);
while (Serial.available())
{
Serial1.write(Serial.read());//Forward what Serial received to Software Serial Port
}
while(Serial1.available())
{
Serial.write(Serial1.read());//Forward what Software Serial received to Serial Port
}
}
However, the serial monitor gives me no data. Nothing. I only see "Initializing..." and I don't know what to do anymore. I have to deliver a project next week with GPS and Blynk and I've been fighting with GSM module and GPS for 1 month. I pull my hair out XD
How could I do communication with the A9G?
Thank you very much for any kind of help.
I've been trying to connect two HC-05 bluetooth modules together as master and slave devices. I know that to do this i need to establish one as a slave device and one as a master using the AT command mode. I am using an arduino nano with each of the modules and the circuit i have used is shown:
Vcc -----> 5V
GND ----> GND
Rx ------> Rx
Tx ------> Tx
I followed various online tutorials and have used this code:
include SoftwareSerial.h
SoftwareSerial BTSerial(0, 1); // RX | TX
void setup()
{
Serial.begin(9600);
BTSerial.begin(9600); // HC-05 default speed in AT command more
Serial.println("Enter AT commands:");
}
void loop()
{
// Keep reading from HC-05 and send to Arduino Serial Monitor
if (BTSerial.available()){
Serial.write(BTSerial.read());
}
// Keep reading from Arduino Serial Monitor and send to HC-05
if (Serial.available()){
BTSerial.write(Serial.read());
}
}
Using the button on the module or by setting the EN pin high, i am able to put the module into AT mode as displayed by the LED blinking every 2 seconds. However, i receive no response after sending commands to the module using the serial monitor when i should receive a confirmation of my command.
Any ideas where i'm going wrong?
Here's the solution that eventually worked for me: I used this circuit with a voltage divider:
Vcc -----> 5V
GND ----> GND
D2 ------> Tx
D3 ------> Rx
I ended up having to buy an Uno for this to work, I'm assuming then that my Nano's were faulty in some way. I then used the following code:
#include <SoftwareSerial.h>
SoftwareSerial BTSerial(2, 3); // RX | TX
void setup()
{
Serial.begin(9600);
BTSerial.begin(38400); // HC-05 default speed in AT command more
Serial.println("Enter AT commands:");
}
void loop()
{
// Keep reading from HC-05 and send to Arduino Serial Monitor
if (BTSerial.available()){
Serial.write(BTSerial.read());
}
// Keep reading from Arduino Serial Monitor and send to HC-05
if (Serial.available()){
BTSerial.write(Serial.read());
}
}
This allowed me to enter the AT mode and also receive responses.
One of the issues was that I was using the Tx and Rx pins which are also used to communicate with the computer so cannot be used with the HC-05 at the same time.
Another issue was the baudrate: I alternated between 9600 and 38400 for each communication until I found a combination that worked, and adjusted the speed in the Serial monitor so that it made sense.
Then I was able to use the command mode normally.
I am trying to get my SIM800C to talk with my Arduino. There is no communication happening, though.
#include <SoftwareSerial.h>
SoftwareSerial at(2, 3);
void setup() {
Serial.begin(9600);
at.begin(9600);
}
void loop() {
// try every 2 seconds
delay(2000);
Serial.println("sending AT ... ");
at.println("AT");
while (at.available() > 0) {
Serial.write(at.read());
}
}
I am not able to get an OK back. SIM800C is supposed to detect the baud rate by itself.
I am sure there has to be a simple stupid mistake. I just don't know what to do at this point. I obviously already checked for cable break. Out of desperation I already tried to switch RX and TX. I also tried different baud rates (whatever is within the usual limitations of SoftwareSerial) but it should automatically detect it once a couple of AT commands got in anyway.
Weird enough, the pin PWX on the SIM800C needs to be hooked up to a GND to work. It started blinking every second now and is responding to AT commands.
Also it turned out that this specific module does not ship with autobauding enabled, as stated by the SIM800C documentation. The correct baud rate is 115200.
There are some problems you need to consider:
Use below sample code which transfers data between PC and SIM. Sometimes SIM module would go into power down state and won't respond on any AT command but would print some results in the serial monitor.
As already mentioned in comments it seems that your wiring is wrong and as you declared Software Serial as SoftwareSerial at(2, 3); which means pin 2 is Rx on Arduino and should connect to Tx pin of SIM and pin 3 is Tx on Arduino and should connect to Rx pin of SIM. Please don't mess with the pins and connect the pins like below correctly.
Arduino SIM
Rx 2 ----> Tx
Tx 3 ----> Rx
I'm not sure if you can power on SIM800 with a 500mA USB connector, make sure that use an external 1/2 A power supply for VCC of SIM module.
Look at the blink speed of SIM module if it connected and powered on it would blinky with 3 seconds delay and if it blinks fast, it means that it is being restarted. Also if SIM powered on correctly it would print some info like SIM READY, CALL READY, etc.
Try other baud rates like 115200 and see if you get anything on power on.
I put some macro definition to make pin mappings more clear.
#include <SoftwareSerial.h>
//SIM800 TX is connected to Arduino D2
#define SIM800_TX_PIN 2
//SIM800 RX is connected to Arduino D3
#define SIM800_RX_PIN 3
//Create software serial object to communicate with SIM800
SoftwareSerial serialSIM800(SIM800_TX_PIN,SIM800_RX_PIN);
void setup() {
//Begin serial comunication with Arduino and Arduino IDE (Serial Monitor)
Serial.begin(9600);
while(!Serial);
//Being serial communication witj Arduino and SIM800
serialSIM800.begin(9600);
delay(1000);
Serial.println("Setup Complete!");
}
void loop() {
//Read SIM800 output (if available) and print it in Arduino IDE Serial Monitor
if(serialSIM800.available()){
Serial.write(serialSIM800.read());
}
//Read Arduino IDE Serial Monitor inputs (if available) and send them to SIM800
if(Serial.available()){
serialSIM800.write(Serial.read());
}
}
Yes this module will not work in this configuration. There is a pin of V_TTL With 5V pin.. This pin enables the TTL logic converter of your GSM.. You have to connect this pin to 5V in case of arduino and to 3V in case of ESP8266.See the pin configuration here
I am trying to communicate with my ESP8266 module through Arduino Mega with the ESP's Rx pin connected to Mega's Pin 7 the ESP's Tx pin connected to Mega's Pin 6. I tried to run the following test code:
#include <SoftwareSerial.h>
SoftwareSerial esp8266(6, 7);
void setup() {
// Open serial communications and wait for port to open:
Serial.begin(115200);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
Serial.println("Started");
// set the data rate for the SoftwareSerial port
esp8266.begin(9600);
esp8266.write("AT\r\n");
}
void loop() {
if (esp8266.available()) {
Serial.write(esp8266.read());
}
if (Serial.available()) {
esp8266.write(Serial.read());
}
}
I get no response from the ESP8266 module. I then tried to use the Mega's dedicated Tx and Rx pins (1 and 0 respectively). I can send commands using the serial monitor and it replies. First I sent AT+CIOBAUD=9600 under a 115200 baud to change the baud rate of my ESP module to 9600. Then under 9600 baud I sent AT+UART_DEF=9600,8,1,0,0. It replied OK for both as expected. I tried again to run this program but I'm still getting no response from the ESP 8266 module. I also tried simply switching the Rx and Tx pins just to be safe. Still doesn't work. Any ideas on what I might be doing incorrectly?
As you've mentioned in comments, SoftwareSerial esp(6,7) works on UNO but not on Mega. That should be hint big enough to google the Arduino SoftwareSerial reference page, particularly the Limitation section.
In short, unlike UNO the Mega doesn't have Pin Change Interrupt capability on all pins. So you can't have Rx pin on pin 6.
I am a newbie with Arduino Mega 2560 .I have been trying to connect the Arduino and SIM900A module(GSM/GPRS module).I have connected the USB to my PC(Serial instance) and pins 18(Tx) and 19(Rx) to Rx and Tx in the GSM/GPRS module respectively and the GND pin(GSM/GPRS) module's is connected to GND,one near pin 13 in the Arduino.
Power connection:-
I am powering using 12V supplies for each of the boards.
The below is my code.
void setup()
{
Serial.begin(9600);
Serial1.begin(9600);
delay(1000);
Serial.print("Initial Setup !!");
delay(5000);
}
void loop()
{
if(Serial.available())
{
char a=Serial.read();
Serial1.print(a);
//Serial.print(a);
}
if(Serial1.available())
{
char B=Serial1.read();
Serial.print(B);
//Serial.print(a);
}
}
I am able to get the initial response in the "Serial Monitor" like (+CFUN:1,+CPIN:READY)(Once I open the Serial monitor I used to press the reset in the GSM/GPRSmodule).
But when I type some AT commands in the Serial Monitor,I am not able to get the response like "OK" from the GPRS/GSM Module.
Please let me know what I should be doing for getting the responses back from GSM/GPRS module.
Have you tried cutting out the Arduino, for just a moment? Get yourself a UART and wire up TX/RX to the GMS respectively. Then plug it into your PC and launch terminal (Tera Term, etc.).
Try issuing some AT commands and make sure you're getting correct responses/echos. You may also want to try a tool called QNavigator (free download).