I have an arduino GSM shield sitting on top of an arduino uno. I have the code below. The shield just shows me it is connecting but it never shows me it is connected.I want to know why it is not connecting.I will be grateful for any help.Am using arduino 1.0.5 IDE.
#include <GSM.h>
#define PINNUMBER ""
GSM gsmAccess(true);
GSM_SMS sms;
void setup() {
// initialize serial communications and wait for port to open:
Serial.begin(9600);
char code = 'X';
while(true) {
Serial.println("try Access");
code=gsmAccess.begin("",true,false);
Serial.println("\nAfter Access");
if(code==GSM_READY){
Serial.println("connected");
break;
}
if(code==CONNECTING) {
Serial.println("code is CONNECTING");
} else {
Serial.println(code);
delay(1000);
}
}
}
You are starting up the modem in asynchronous mode with:
code=gsmAccess.begin("",true,false);
Looking at the GSMBegin documentation, you are going to get a return value of 0 always which does not correspond to the GSM_READY enum type which is 3 I believe. Try:
code=gsmAccess.begin("",true);
try connecting a 9v battery to it. for me that solved the problem. i had the same issue. apparently, the gsm shield uses a lot of power. some computers can deliver enough, some cant.
I had the same problem. I solved it by connecting a 680 μF capacitor between 5 V and GND. This is only a temporary fix because it is going to create a huge current spike when connecting the power supply. A better solution would be to connect an external power supply or a more capable USB power supply.
Related
Good afternoon,
I am trying to communicate through WiFi with ESP8266 module on Arduino. So far I have succeded to make my hardware setup and a very basic communication in between Arduino and ESP8266 module. I am using SoftwareSerial library to communicate, however the data outputs printed to the Serial seems quite corrupted, even though the module succesfully connects.
When I sent AT+CWJAP="AndroidAP","52689785" on Serial console, this is the output:
AT+CWJAP="AndroidAP","52689785"
AT+C⸮⸮P⸮⸮⸮⸮⸮⸮⸮ѕ͉b⸮⸮⸮⸮⸮⸮ѕ⸮ɂ⸮⸮j
WIFI DISCONNQ(UH⸮WIFI CONNECTED
WHFI GOT IP
OK
Below is my full code, I communicate with ESP module through pins 10 and 11:
#include "SoftwareSerial.h"
SoftwareSerial softSerial(10, 11); // RX, TX
void setup()
{
Serial.begin(9600);
// Serial.setTimeout(30);
softSerial.begin(115200);
// softSerial.setTimeout(30);
while(!Serial);
}
void loop()
{
if (softSerial.available())
{
String message = softSerial.readString();
Serial.print(message);
}
if (Serial.available())
{
String message = Serial.readString();
Serial.print(message);
softSerial.print(message);
}
}
I would appreciate if you could show me the solution for a better communication in between Arduino and ESP module, thanks!
Most of the ESP8266 modules will be working better at 115200 baud rate.
The reason for gibberish output can be:
either you may be viewing output at 9600 baud rate
visit the link
So I recently bought the Arduino Wifi Shield 101. I went through the getting started steps, and just copied and pasted their "scan for networks" code. The code that I used is down below. So to help you guys help me, I should say my school's wifi is wpa2 encrypted. However, the code is simply looking for possible networks to connect to. The code runs fine until it gets to the "Wifi.macAddress(mac)" line. I don't understand why the code stops working here. There aren't any errors in compiling or uploading, the code just seems to not be working. Im obviously a beginner with the arduino wifi board, so any help at all would be great.
Here's the code:
`#include <SPI.h>
#include <WiFi101.h>
void setup() {
// initialize serial and wait for the port to open:
Serial.begin(9600);
while(!Serial);
// attempt to connect using WEP encryption:
Serial.println("Initializing Wifi...");
printMacAddress();
// scan for existing networks:
Serial.println("Scanning available networks...");
listNetworks();
}
void loop() {
delay(10000);
// scan for existing networks:
Serial.println("Scanning available networks...");
listNetworks();
}
void printMacAddress() {
// the MAC address of your Wifi shield
byte mac[6];
// print your MAC address:
Serial.print("The code got to here");
WiFi.macAddress(mac); //why won't this method work?
Serial.print("The code never reaches this point ... Why?!?!?");
Serial.print("MAC: ");
Serial.print(mac[5],HEX);
Serial.print(":");
Serial.print(mac[4],HEX);
Serial.print(":");
Serial.print(mac[3],HEX);
Serial.print(":");
Serial.print(mac[2],HEX);
Serial.print(":");
Serial.print(mac[1],HEX);
Serial.print(":");
Serial.println(mac[0],HEX);
}
void listNetworks() {
// scan for nearby networks:
Serial.println("** Scan Networks **");
byte numSsid = WiFi.scanNetworks();
// print the list of networks seen:
Serial.print("number of available networks:");
Serial.println(numSsid);
// print the network number and name for each network found:
for (int thisNet = 0; thisNet<numSsid; thisNet++) {
Serial.print(thisNet);
Serial.print(") ");
Serial.print(WiFi.SSID(thisNet));
Serial.print("\tSignal: ");
Serial.print(WiFi.RSSI(thisNet));
Serial.print(" dBm");
Serial.print("\tEncryption: ");
Serial.println(WiFi.encryptionType(thisNet));
}
}`
Are you powering the boards via USB? If so, you're likely experiencing an under-power issue.
My original answer was deleted (so I don't know what you can and cannot see), but the link to the Arduino bug I filed is here:
Arduino 101 + Wifi 101 Shield board freeze. #50
As it turns out, my board was simply under-powered as I was using a USB port rather than a wall outlet. I actually ended up using a different USB port and the scanNetworks example now works for me.
EDIT Actually, as it turns out, it was the USB cable. Either way, power was the issue.
I would recommend powering the board via a wall wart or choosing a different USB port and trying again.
I am doing a simple tcp communication from an arduino to raspberry-pi wirelessly with an ESP8266 wifi module on arduino uno.The tcp server is running on the raspberry-pi.I am able to do TCP communication with the following AT commands in arduino serial monitor at a baudrate of 9600.
AT+CIPMUX=1
AT+CIPSTART=4,"TCP","192.168.43.150",7777
AT+CIPSEND=4,5
>hai
How to do this programatically in an arduino sketch.I used the following code on my arduino uno,but still without any success.The baudrate is 9600 only since it is working directly in serial monitor.
#include <SoftwareSerial.h>
SoftwareSerial esp8266(2,3);
void setup()
{
Serial.begin(9600);
esp8266.begin(9600); // your esp's baud rate might be different
}
void loop()
{
esp8266.println("AT");
if(esp8266.available()) // check if the esp is sending a message
{
while(esp8266.available())
{
// The esp has data so display its output to the serial window
char c = esp8266.read(); // read the next character.
Serial.write(c);
}
}
}
The connections are as follows
ESP8266 Arduino Uno
Vcc 3.3V
CH_PD 3.3V
RX RX(PIN 2)
TX TX(PIN 3)
GND GND
This might be a bit late, but I got stuck with a similar problem fairly recently. If it's sorted then feel free to ignore this.
Depending on firmware version of your ESP8266 module the baud rate of 9600 may not work, try out 115200 instead - it may prove to be more reliable?
I think the main reason your code above isn't working is because of the face that the ESP needs both newline and carriage returns at the end of the AT command. The serial monitor adds these on for you. Rather than sending AT try sending AT\r\n. This should encourage the ESP to reply with OK, or if the echo is turned on AT\r\nOK.
Serial.available() also checks that there is content in a receive buffer - this takes time unfortunately so I had to put a delay(10) in there to get it to register a character in the buffer.
#include <SoftwareSerial.h>
//i find that putting them here makes it easier to
//edit it when trying out new things
#define RX_PIN 2
#define TX_PIN 3
#define ESP_BRATE 115200
SoftwareSerial esp8266(RX_PIN, TX_PIN);
void setup()
{
Serial.begin(9600);
esp8266.begin(ESP_BRATE); // I changed this
}
void loop()
{
esp8266.println("AT\r\n"); //the newline and CR added
delay(10); //arbitrary value
if(esp8266.available()) // check if the esp is sending a message
{
while(esp8266.available())
{
// The esp has data so display its output to the serial window
char c = esp8266.read(); // read the next character.
Serial.write(c);
}
}
}
My next problem is that the0 replies for my ESP are unreliable - sometimes they are read as OK but sometime they are garbage values. I suspect it's a matter of not enough power to the module.
I have come across the same problem and yet not have found a solution.
But your connections are a bit of, you have to connect the TX pin of your ESP8266 module to the RX pin of your arduino and the RX pin of your ESP8266 module to the TX pin.
Hope this helps you on your way
I have a USB 2 Serial adapter and the device is working fine. I see the device perfectly configured in my System.
I have connected the TX0 pin of Arduino to DB 2 pin (read pin) of the adapter. Below is my Arduino code:
int i = 0;
void setup()
{
Serial.begin(9600);
}
void loop()
{
for(i=0;i<6;i++)
{
Serial.write('H');
delay(100);
}
}
But when I try to read thru terminal software of data received at my COM port I see some junk character incoming. I am pretty sure that I am using same baud rate / flow setting both side. Why am I facing this issue - do I need to connect any other pins also as I just need to receive data at system side?
You should connect the ground pin with the ground pin
Arduino Communicate with Ur computer using pins 0 and 1( Tx0 and Rx0)
you shouldn't be connected to the Tx0 pin to another serial device because arduino use it to communicate with computer.
if you are using Uno. Check for Software Serial. and two grounds should be connected.
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).