A02YYUW UART communication with ESP32 not Working properly.

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Zach3d
Posts: 1
Joined: Mon May 15, 2023 8:47 am

A02YYUW UART communication with ESP32 not Working properly.

Postby Zach3d » Mon May 15, 2023 9:12 am

Good Day,
I've been working to interface the A02YYUW sensor with an ESP32. Thus far, I have not been successful. Im using the SoftwareSerial library to interact with the sensor as it is connected to HW pins 12 and 14. I do not have physical access to the ESP32, so I cannot change these pins to HW UART pins. Likewise, I am using the WebSerial library to get readouts from the ESP32/Ultrasonic.

[Codebox]
// Import required libraries
#include <Arduino.h>
#include <WiFi.h>
#include <AsyncTCP.h>
#include <ESPAsyncWebServer.h>
#include <AsyncElegantOTA.h>
#include <WebSerial.h>
#include <SoftwareSerial.h>

// Replace with your network credentials
const char* ssid = "placeholder";
const char* password = "placeholder";

#define MYPORT_TX 12
#define MYPORT_RX 14

bool relayState = 0;
const int relayPin = 32;//17;

//SoftwareSerial myPort (MYPORT_RX, MYPORT_TX);
unsigned char data[4]={};
float distance;
EspSoftwareSerial::UART myPort;

// Create AsyncWebServer object on port 80
AsyncWebServer server(80);
AsyncWebSocket ws("/ws");

const char index_html[] PROGMEM = R"rawliteral(
<!DOCTYPE HTML><html>
<head>
<title>ESP Web Server</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="icon" href="data:,">
<style>
html {
font-family: Arial, Helvetica, sans-serif;
text-align: center;
}
h1 {
font-size: 1.8rem;
color: white;
}
h2{
font-size: 1.5rem;
font-weight: bold;
color: #143642;
}
.topnav {
overflow: hidden;
background-color: #143642;
}
body {
margin: 0;
}
.content {
padding: 30px;
max-width: 600px;
margin: 0 auto;
}
.card {
background-color: #F8F7F9;;
box-shadow: 2px 2px 12px 1px rgba(140,140,140,.5);
padding-top:10px;
padding-bottom:20px;
}
.button {
padding: 15px 50px;
font-size: 24px;
text-align: center;
outline: none;
color: #fff;
background-color: #0f8b8d;
border: none;
border-radius: 5px;
-webkit-touch-callout: none;
-webkit-user-select: none;
-khtml-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
-webkit-tap-highlight-color: rgba(0,0,0,0);
}
/*.button:hover {background-color: #0f8b8d}*/
.button:active {
background-color: #0f8b8d;
box-shadow: 2 2px #CDCDCD;
transform: translateY(2px);
}
.state {
font-size: 1.5rem;
color:#8c8c8c;
font-weight: bold;
}
</style>
<title>ESP Web Server</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="icon" href="data:,">
</head>
<body>
<div class="topnav">
<h1>ESP WebSocket Server</h1>
</div>
<div class="content">
<div class="card">
<h2>Output - GPIO 2</h2>
<p class="state">state: <span id="state">%STATE%</span></p>
<p><button id="button" class="button">Toggle</button></p>
</div>
</div>
<script>
var gateway = `ws://${window.location.hostname}/ws`;
var websocket;
window.addEventListener('load', onLoad);
function initWebSocket() {
console.log('Trying to open a WebSocket connection...');
websocket = new WebSocket(gateway);
websocket.onopen = onOpen;
websocket.onclose = onClose;
websocket.onmessage = onMessage; // <-- add this line
}
function onOpen(event) {
console.log('Connection opened');
}
function onClose(event) {
console.log('Connection closed');
setTimeout(initWebSocket, 2000);
}
function onMessage(event) {
var state;
if (event.data == "1"){
state = "ON";
}
else{
state = "OFF";
}
document.getElementById('state').innerHTML = state;
}
function onLoad(event) {
initWebSocket();
initButton();
}
function initButton() {
document.getElementById('button').addEventListener('click', toggle);
}
function toggle(){
websocket.send('toggle');
}
</script>
</body>
</html>)rawliteral";

void notifyClients() {
ws.textAll(String(relayState));
}

void handleWebSocketMessage(void *arg, uint8_t *data, size_t len) {
AwsFrameInfo *info = (AwsFrameInfo*)arg;
if (info->final && info->index == 0 && info->len == len && info->opcode == WS_TEXT) {
data[len] = 0;
if (strcmp((char*)data, "toggle") == 0) {
relayState = !relayState;
notifyClients();
}
}
}

void onEvent(AsyncWebSocket *server, AsyncWebSocketClient *client, AwsEventType type,
void *arg, uint8_t *data, size_t len) {
switch (type) {
case WS_EVT_CONNECT:
Serial.printf("WebSocket client #%u connected from %s\n", client->id(), client->remoteIP().toString().c_str());
break;
case WS_EVT_DISCONNECT:
Serial.printf("WebSocket client #%u disconnected\n", client->id());
break;
case WS_EVT_DATA:
handleWebSocketMessage(arg, data, len);
break;
case WS_EVT_PONG:
case WS_EVT_ERROR:
break;
}
}

void initWebSocket() {
ws.onEvent(onEvent);
server.addHandler(&ws);
}

String processor(const String& var){
Serial.println(var);
if(var == "STATE"){
if (relayState){
return "ON";
}
else{
return "OFF";
}
}
return String();
}
void recvMsg(uint8_t *data, size_t len){
WebSerial.println("Received Data...");
String d = "";
for(int i=0; i < len; i++){
d += char(data);
}
WebSerial.println(d);
if (d == "ON"){
digitalWrite(relayPin, HIGH);
}
if (d=="OFF"){
digitalWrite(relayPin, LOW);
}
}

void setup()
{
Serial.begin(115200); // Standard hardware serial port

// Connect to Wi-Fi network with SSID and password
Serial.print("Setting AP (Access Point)…");
// Remove the password parameter, if you want the AP (Access Point) to be open
WiFi.softAP(ssid, password);

IPAddress IP = WiFi.softAPIP();
Serial.print("AP IP address: ");
Serial.println(IP);

server.begin();
initWebSocket();

// Route for root / web page
server.on("/", HTTP_GET, [](AsyncWebServerRequest *request){
request->send_P(200, "text/html", index_html, processor);
});

// Start ElegantOTA
AsyncElegantOTA.begin(&server);
// Start server
server.begin();

// WebSerial is accessible at "<IP Address>/webserial" in browser
WebSerial.begin(&server);
WebSerial.msgCallback(recvMsg);
server.begin();

myPort.begin(9600, EspSoftwareSerial::SWSERIAL_8N1, MYPORT_RX, MYPORT_TX, false);
if (!myPort) { // If the object did not initialize, then its configuration is invalid
WebSerial.println("Invalid EspSoftwareSerial pin configuration, check config");
while (1) { // Don't continue with invalid configuration
delay (1000);
}
}
}

void loop() {
do{
for(int i=0;i<4;i++)
{
data=myPort.read();
}
}while(myPort.read()==0xff);

WebSerial.print("Data 0 =");
WebSerial.println(data[0]);
delay(500);
WebSerial.print("Data 1 =");
WebSerial.println(data[1]);
delay(500);
WebSerial.print("Data 2 =");
WebSerial.println(data[2]);
delay(500);
WebSerial.print("Data 3 =");
WebSerial.println(data[3]);
delay(500);

if(data[0]==0xff)
{
int sum;
sum=(data[0]+data[1]+data[2])&0x00FF;
if(sum==data[3])
{
distance=(data[1]<<8)+data[2];
if(distance>30){
WebSerial.print("distance=");
WebSerial.print(distance/10);
WebSerial.println("cm");
}
else
{
WebSerial.println("Below the lower limit");
}
}else WebSerial.println("ERROR");
}
ws.cleanupClients();
myPort.flush();
delay(500);
}[/Codebox]
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lbernstone
Posts: 826
Joined: Mon Jul 22, 2019 3:20 pm

Re: A02YYUW UART communication with ESP32 not Working properly.

Postby lbernstone » Mon May 15, 2023 4:00 pm

Hardware serial can be redirected to any of the gpio pins, 12 and 14 will work just fine, although it will be better to have TX on 12 (https://github.com/espressif/esp-idf/tr ... out-gpio12).
https://github.com/espressif/arduino-es ... ial.h#L109
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