I am trying to use an arduino uno to check to see if an esp8266-015 wifi module is working using AT commands.
Connections
ESP8266 Arduino
Rx-Rx
Tx-Tx
GND-GND
EN-3.3v
VDD-3.3
I selected arduino uno in my board manager and the correct port
this code is just a setup and loop
void setup() {
// put your setup code here, to run once:
}
void loop() {
// put your main code here, to run repeatedly:
}
But when I type AT into the serial monitor, nothing happens, All I see is the serial monitor spitting this.
image
I have looked through several tutorials and I keep getting this error, it just keeps printing the gray question marks. This is my first time using an esp8266 wifi module.
Related
I'm currently trying to run an MLX90614 sensor on a ESP32 board (lolin32 lite)
This board doesn't have a pin 21 and from a forum I discovered I can use pin 23 and 19.
I tested this out with the I2C scanner code and this works.
Now I like to use Adafruit MLX90614 library and tell it to use pins 23,19.
Adafruit_MLX90614 mlx = Adafruit_MLX90614();
void setup() {
// put your setup code here, to run once:
Serial.begin(115200);
Wire.end();
Wire.setPins(23,19);
Wire.begin();
delay(100);
if (!mlx.begin(90, &Wire)) {
Serial.println("Error connecting to MLX sensor. Check wiring.");
while (1);
};
}
I keep getting "Error connecting to MLX sensor. Check wiring" so it doesn't overwrite the pin settings.
Can this been done?
UPDATE: I found my mistake. I had changed the I2C address of the MLX sensor in a previous project. That is why the I2C scanner code worked and Adafruit default address not.
I'm working on a room visualization project, similar to this (taken from this video):
Im using LeddarVu8 from leddartech (see image below), arduino uno (with rs485shield):
I've also used the code provided from leddartech of simple16channel (no lcd):
#include "C:\Program Files (x86)\Arduino\libraries\Leddar.h"
/*
Simple Leddar(TM) Example - Without LCD
Language: Arduino
This program lists the detections read on the serial port of the Arduino.
Can be used with Arduino IDE's Serial Monitor.
Shields used:
* RS-485 Shield
Created 01 Jun. 2015
by Pier-Olivier Hamel
This example code is in the public domain.
*/
Leddar16 Leddar1(115200,1);
//Baudrate = 115200
//Modbus slave ID = 01
void setup()
{
//Initialize Leddar
Leddar1.init();
}
void loop()
{
char result = Leddar1.getDetections();
if (result >= 0)
{
for (int i = 0; i < Leddar1.NbDet; i++)
{
Serial.print("Segment: ");
Serial.print(Leddar1.Detections[i].Segment);
Serial.print(" Distance: ");
Serial.print(Leddar1.Detections[i].Distance);
Serial.print("\n");
}
}
else
{
Serial.print("Error: ");
Serial.print((int)result);
Serial.print("\n");
}
delay(50);
}
(from https://support.leddartech.com/downloads/files/89-leddarsdk3-2-0-pi2-tar-gz)
The problem is that serial monitor of the arduino only outputs a series of ?????. Why is that?
The problem is that serial monitor of the arduino only outputs a series of ?????. Why is that?
Because you have connected the TX of the LIDAR to the TX of the Arduino. The Serial Monitor window "listens" to the Arduino TX pin (via USB), so the Serial Monitor is actually listening to the LIDAR. The LIDAR serial is running at 115200, but your Serial Monitor is probably set to 9600. When the baud rates don't match, you'll get garbage characters.
Also notice that you have two serial TX pins connected to each other. This will also corrupt the characters if the Arduino and the LIDAR both try to transmit at the same time.
You may be able to connect the LIDAR RX to the Arduino TX, and the LIDAR TX to the Arduino RX. This would allow you to see the Leddar library commands on the Serial Monitor window. It would also cause all Serial prints to go to the LIDAR (and the PC). This might be ok if the Leddar command packets have a special format. This would allow the Leddar to ignore your debug prints, because they would not formatted correctly.
In that configuration, you would have to disconnect Arduino pin 0 to upload new sketches over USB. Some people put a switch in that wire to make it easy to disconnect.
I started adventure with arduino and programming 2 months ago.So, I am new in this topics.
Until now I realized few projects including Blynk connected with arduino. The last one was similar to one described in topic but I used the ENC28j60 instead of ESP8266 module and then it worked fine.
The problem started with ESP module.
Short description of project:
The main idea is to control AC light with Blynk App support.
First of all I made a connection according to picture below:
As power source I used the USB phone charger connected with step by voltage converter to get in final the 3.3V source.
I additionally connected the Arduino Uno with relay module like this:
Arduino ====> Relay module
5V ====> VCC
GND ====> GND
Pin 5 ====> IN1
Everythink you can see in pictures below (sorry for quality)
And for now I did almost every step (with so many problems). Here I mean:
1. I checked if arduino is connected with ESP module by serial port -> system report "ready" status.
2. I upload the below (template) Arduino IDE sketch for my project:
#define BLYNK_PRINT Serial
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "***";
// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "***";
char pass[] = "***";
void setup()
{
// Debug console--
Serial.begin(9600);
Blynk.begin(auth, ssid, pass);
}
void loop()
{
Blynk.run();
}
And finally I started the New project in Blynk. I set the Arduino uno as a hardware model and WiFi as connection type. Then I added the Button and set the Output to D5.
And now (close to the end of project) I met with a problem. After pushing the connect button (in up-right corner) I receive the information that device is connected (Online). Then when I try to push the button to Active Relay - nothing happens.
Whats more. I tried with different pins on Arduino with the same results. And I don't know why (probably because I have still small knowladge) but when I set the Button output value to D2 - after connection when I push it then the diode on ESP module Turn OFF and Turn ON.
I tried to find solution on this forum and in many other places for last 3 days but without any results. That's why I decided to ask You for help. Do you know what did I wrong or what should I add to project to make connection between the Blynk and relay work correct?
Write if you will need some more or detailed information from my side.
Why are you using both the uno and the esp? You can just use the esp instead of the combo, will make your project less power hungry and smaller. If you wonder about using just the esp, you can use the nodemcu boards (which can be found for less that 4€ per unit in China).
I've some example sketches for this (with temperature and humidity), if you want to take a look at those.
When looking at the pictures and code you have postet, it seems that you have flashed the ESP with a Arduino sketch. This is fine if you would like to activate the relay directly with the ESP (without the Arduino UNO).
Then you just have to connect the relay to the ESP instead of to the Arduino. Unfortunately not all relay boards can operate with the 3.3V logic that the ESP supplies, but maybe you'r lucky.
On the other hand, if you would like to use the Arduino UNO with the ESP as Wi-Fi, then you would have to reflash the ESP with the original AT firmware. Then you could connect it to the Arduino and use a sketch that looks something like this.
#define BLYNK_PRINT Serial
#include <ESP8266_Lib.h>
#include <BlynkSimpleShieldEsp8266.h>
char auth[] = "YourAuthToken";
char ssid[] = "YourNetworkName";
char pass[] = "YourPassword";
#include <SoftwareSerial.h>
SoftwareSerial EspSerial(2, 3);
// pin 3 connected to ESP RX and pin 2 connected to ESP TX
// Your ESP8266 baud rate:
#define ESP8266_BAUD 115200
ESP8266 wifi(&EspSerial);
void setup()
{
// Debug console
Serial.begin(9600);
delay(10);
// Set ESP8266 baud rate
EspSerial.begin(ESP8266_BAUD);
delay(10);
Blynk.begin(auth, wifi, ssid, pass);
}
void loop()
{
Blynk.run();
}
And you should remove the connection between RST and GND on the Arduino
I'm trying, more specifically, to hibernate my computer with an infrared remote using arduino. I already have it set up so that the arduino registers the button on said infrared remote, and can then trigger an action. What I'm trying to code on my computer is a batch script that will constantly run and listen for serial data from the arduino. The theory is that when the arduino gets the infrared signal, it will blast a letter through serial, or 'o'. Then, the batch script on the computer will see that, and proceed to hibernate the computer. I have already tried
MODE COM6:9600,N,8,1 >NUL
type COM6 > sample.txt
to test whether or not windows could read the serial data, but the arduino just starting broadcasting a '1' for a tenth of a second every second. Once I ran this, and a text file was generated that was completely blank. Here is the arduino code:
void setup() {
Serial.begin(9600);
}
void loop() {
Serial.write("Hello!");
delay(1000);
}
I have recently been trying to pneumatically actuate a cylinder using a 12 V double solenoid and an Arduino Uno. The solenoid works when tested without code and wiring, however when I try to actuate the cylinder using code, nothing happens. I have a feeling that the way in which I wired everything to the breadboard may be incorrect, so I was wondering if anyone had any tips or good schematics by which I could wire it all together.
The materials I am using are two PNP transistors, two resistors, two diodes, and then the actual solenoid and similar hardware. My code is just a simple LED blink code which can be used to send signals to the solenoids, so I do not believe that is the issue. However, I have attached it underneath just in case.
int solenoid1 = 4;
int solenoid2 = 5;
void setup() {
// put your setup code here, to run once:
pinMode(solenoid1, OUTPUT);
pinMode(solenoid2, OUTPUT);
}
void loop() {
// put your main code here, to run repeatedly:
digitalWrite(solenoid1, HIGH);
delay(1000);
digitalWrite(solenoid1, LOW);
digitalWrite(solenoid2, HIGH);
delay(1000);
digitalWrite(solenoid2, LOW);
}
Arduino digital pin puts 5V when HIGH. So your 12V solenoid do not get enough voltage to run. You have to use relay and additional 12V power supply to run your solenoid with Arduino.
The code which I have written is not running when the Arduino gets plugged in
How can you see this?
A solenoid certainly cannot be controlled by 5V * 20mA from an Arduino pin. Further requirements depend on the solenoid you want to use. (Current consumption, free-wheeling diode already integrated?)