Alex_S wrote:Hi!
You need to do the following connections:
1. CH_PD and GPIO0 - to VCC 3.3V
2. GPIO15 - to GND.
Thanks but, I can communicate via usb-ttl with AT commands so the module (tested ESP-03 and ESP01) is working as supposed to.
Also, I'm using an external power supply (breadboard PSU) so I don't (should not) have power issues.
Further tests (with arduino nano v4) showed me that I can get an answer to AT commands if I upload a blank sketch to arduino (works as a bridge, tx-to-tx, rx-to-rx).
If I upload a tested code, such like (obviously modified to suit my data and baudrates):
Code: Select all#include<stdlib.h>
#include <SoftwareSerial.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#define ONE_WIRE_BUS 8
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);</p><p>
#define SSID "[YOUR_SSID]"
#define PASS "[YOUR_PASSWORD]"
#define IP "184.106.153.149" // thingspeak.com
String GET = "GET /update?key=[THINGSPEAK_KEY]&field1=";
SoftwareSerial monitor(10, 11); // RX, TX
void setup()
{
monitor.begin(9600);
Serial.begin(9600);
sensors.begin();
sendDebug("AT");
delay(5000);
if(Serial.find("OK")){
monitor.println("RECEIVED: OK");
connectWiFi();
}
}
void loop(){
sensors.requestTemperatures();
float tempC = sensors.getTempCByIndex(0);
tempC = DallasTemperature::toFahrenheit(tempC);
char buffer[10];
String tempF = dtostrf(tempC, 4, 1, buffer);
updateTemp(tempF);
delay(60000);
}
void updateTemp(String tenmpF){
String cmd = "AT+CIPSTART=\"TCP\",\"";
cmd += IP;
cmd += "\",80";
sendDebug(cmd);
delay(2000);
if(Serial.find("Error")){
monitor.print("RECEIVED: Error");
return;
}
cmd = GET;
cmd += tenmpF;
cmd += "\r\n";
Serial.print("AT+CIPSEND=");
Serial.println(cmd.length());
if(Serial.find(">")){
monitor.print(">");
monitor.print(cmd);
Serial.print(cmd);
}else{
sendDebug("AT+CIPCLOSE");
}
if(Serial.find("OK")){
monitor.println("RECEIVED: OK");
}else{
monitor.println("RECEIVED: Error");
}
}
void sendDebug(String cmd){
monitor.print("SEND: ");
monitor.println(cmd);
Serial.println(cmd);
}
boolean connectWiFi(){
Serial.println("AT+CWMODE=1");
delay(2000);
String cmd="AT+CWJAP=\"";
cmd+=SSID;
cmd+="\",\"";
cmd+=PASS;
cmd+="\"";
sendDebug(cmd);
delay(5000);
if(Serial.find("OK")){
monitor.println("RECEIVED: OK");
return true;
}else{
monitor.println("RECEIVED: Error");
return false;
}
}
(code from
http://www.instructables.com/id/ESP8266-Wifi-Temperature-Logger/step3/Arduino-Setup-and-Sketch/)
I don't get any answer.
I think it is supposed for me to see the AT reply from the ESP on the IDE monitor. Also, in the softserial monitor I get the errors that show me that the arduino can't find the strings it is looking for to carry on.
If I change the code to send the commands without validation the thingspeak plot don't get updated...
As I have no experience with bidirectional serial comm I'm lost. Could this be a sync issue?
Posted: Thu Jan 15, 2015 10:03 am