Hello everyone, I've spent about two weeks on and off trying to figure this out and I'm at a lost. Hoping for some help!
I have an ESP8266 EP-01 wired to a Leonardo with the following connections
From Leonardo's 3.3V to breadboard's positive rail
From breadboard's positive rail I have three wires going to the Leonardo, VCC, EN, and RST
From Leonardo's RX(0) to ESP's TX
From Leonardo's TX(1) to breadboard A1
From breadboard B1 I have a 330 resistor going to breadboard's B5
From breadboard A5 I have a wire going to the ESP's TX
On the ESP, I have the following sketch
#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
#ifndef STASSID
#define STASSID "ssid"
#define STAPSK "correctpw"
#endif
const char* ssid = STASSID;
const char* password = STAPSK;
ESP8266WebServer server(80);
const int led = 13;
void handleRoot() {
digitalWrite(led, 1);
server.send(200, "text/plain", "hello from esp8266!\r\n");
digitalWrite(led, 0);
}
void setup(void) {
pinMode(led, OUTPUT);
digitalWrite(led, 0);
Serial.begin(9600);
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
Serial.println("");
// Wait for connection
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.print("Connected to ");
Serial.println(ssid);
Serial.print("IP address: ");
Serial.println(WiFi.localIP());
if (MDNS.begin("esp8266")) {
Serial.println("MDNS responder started");
}
server.on("/", handleRoot);
server.on("/inline", {
server.send(200, "text/plain", "this works as well");
});
server.on("/gif", {
static const uint8_t gif[] PROGMEM = {
0x47, 0x49, 0x46, 0x38, 0x37, 0x61, 0x10, 0x00, 0x10, 0x00, 0x80, 0x01,
0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0x2c, 0x00, 0x00, 0x00, 0x00,
0x10, 0x00, 0x10, 0x00, 0x00, 0x02, 0x19, 0x8c, 0x8f, 0xa9, 0xcb, 0x9d,
0x00, 0x5f, 0x74, 0xb4, 0x56, 0xb0, 0xb0, 0xd2, 0xf2, 0x35, 0x1e, 0x4c,
0x0c, 0x24, 0x5a, 0xe6, 0x89, 0xa6, 0x4d, 0x01, 0x00, 0x3b
};
char gif_colored[sizeof(gif)];
memcpy_P(gif_colored, gif, sizeof(gif));
// Set the background to a random set of colors
gif_colored[16] = millis() % 256;
gif_colored[17] = millis() % 256;
gif_colored[18] = millis() % 256;
server.send(200, "image/gif", gif_colored, sizeof(gif_colored));
});
server.addHook([](const String & method, const String & url, WiFiClient * client, ESP8266WebServer::ContentTypeFunction contentType) {
(void)method; // GET, PUT, ...
(void)url; // example: /root/myfile.html
(void)client; // the webserver tcp client connection
(void)contentType; // contentType(".html") => "text/html"
Serial.printf("A useless web hook has passed\n");
Serial.printf("(this hook is in 0x%08x area (401x=IRAM 402x=FLASH))\n", esp_get_program_counter());
return ESP8266WebServer::CLIENT_REQUEST_CAN_CONTINUE;
});
server.addHook([](const String&, const String & url, WiFiClient*, ESP8266WebServer::ContentTypeFunction) {
if (url.startsWith("/fail")) {
Serial.printf("An always failing web hook has been triggered\n");
return ESP8266WebServer::CLIENT_MUST_STOP;
}
return ESP8266WebServer::CLIENT_REQUEST_CAN_CONTINUE;
});
server.addHook([](const String&, const String & url, WiFiClient * client, ESP8266WebServer::ContentTypeFunction) {
if (url.startsWith("/dump")) {
Serial.printf("The dumper web hook is on the run\n");
#ifdef STREAMSEND_API
// we are lucky
client->sendAll(Serial, 500);
#else
auto last = millis();
while ((millis() - last) < 500) {
char buf[32];
size_t len = client->read((uint8_t*)buf, sizeof(buf));
if (len > 0) {
Serial.printf("(<%d> chars)", (int)len);
Serial.write(buf, len);
last = millis();
}
}
#endif
Serial.printf("\nTelling server to forget this connection\n");
static WiFiClient forgetme = *client; // stop previous one if present and transfer client refcounter
return ESP8266WebServer::CLIENT_IS_GIVEN;
}
return ESP8266WebServer::CLIENT_REQUEST_CAN_CONTINUE;
});
server.begin();
Serial.println("HTTP server started");
}
void loop(void) {
server.handleClient();
MDNS.update();
}
And then on the Leonardo I have the following sketch
void setup() {
Serial.begin(9600);
Serial1.begin(9600);
}
void loop() {
if (Serial1.available()) { // If anything comes in Serial1 (pins 0 & 1)
String str = Serial1.readString()+"TEST";
Serial.println(str); // read it and send it out Serial (USB)
}
}
The goal is to be able to go to the ESP's IP address, it will send strings to the Leonardo, which I then plan to do things with. When I have the serial monitor opened for the Leonardo, and navigate to the ESP's IP address in my web browser, I do see the "hello from esp8266!" message in my browser, however nothing gets displayed in the serial monitor for the Leonardo. Can someone please help??
