/*
My Program
*/
#include <SPI.h>
#include <WiFiNINA.h>
#include <Ultrasonic.h>
#include <Wire.h>
///////please enter your sensitive data in the Secret tab/arduino_secrets.h
char ssid[] = ""; // your network SSID (name)
char pass[] = ""; // your network password (use for WPA, or use as key for WEP)
int keyIndex = 0; // your network key index number (needed only for WEP)
int status = WL_IDLE_STATUS;
unsigned char data[4]={};
float distance;
// define ultrasonic ranger data pin
#define RANGERPIN 3
// initialize ultrasonic library
Ultrasonic ultrasonic(RANGERPIN);
WiFiServer server(80);
void setup() {
//Initialize serial and wait for port to open:
Serial.begin(19200);
Serial1.begin(9600);
// while (!Serial) {
// ; // wait for serial port to connect. Needed for native USB port only
// }
// check for the WiFi module:
if (WiFi.status() == WL_NO_MODULE) {
Serial.println("Communication with WiFi module failed!");
// don't continue
while (true);
}
String fv = WiFi.firmwareVersion();
if (fv < WIFI_FIRMWARE_LATEST_VERSION) {
Serial.println(fv);
Serial.println(WIFI_FIRMWARE_LATEST_VERSION);
Serial.println("Please upgrade the firmware");
}
// attempt to connect to WiFi network:
while (status != WL_CONNECTED) {
Serial.print("Attempting to connect to SSID: ");
Serial.println(ssid);
// Connect to WPA/WPA2 network. Change this line if using open or WEP network:
status = WiFi.begin(ssid, pass);
// wait 5 seconds for connection:
delay(5000);
}
server.begin();
// you're connected now, so print out the status:
printWifiStatus();
}
void loop() {
char _buffer[7];
int centimeters;
if (WiFi.status() != WL_CONNECTED) {
Serial.println("Reconnecting to WiFi...");
WiFi.disconnect();
WiFi.begin(ssid, pass);
delay(5000);
}
// listen for incoming clients
WiFiClient client = server.available();
if (client) {
Serial.println("new client");
// an HTTP request ends with a blank line
boolean currentLineIsBlank = true;
while (client.connected()) {
if (client.available()) {
char c = client.read();
Serial.write(c);
// if you've gotten to the end of the line (received a newline
// character) and the line is blank, the HTTP request has ended,
// so you can send a reply
if (c == '\n' && currentLineIsBlank) {
// send a standard HTTP response header
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println("Connection: close"); // the connection will be closed after completion of the response
client.println("Refresh: 5"); // refresh the page automatically every 5 sec
client.println();
client.println("<!DOCTYPE HTML>");
client.println("<html>");
//read the pushbutton value into a variable
//int sensorVal = digitalRead(3);
//print out the value of the pushbutton
//client.println(sensorVal);
// get distance in centimeters
//centimeters = ultrasonic.MeasureInCentimeters();
do{
for(int i=0;i<4;i++)
{
data[i]=Serial1.read();
client.println(data[i]);
}
}while(Serial1.read()==0xff);
Serial1.flush();
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)
{
client.print("distance=");
client.print(distance/10);
client.println("cm");
}else
{
client.println("Below the lower limit");
}
}else client.println("ERROR");
}
// client.print("Distance is: ");
// client.print(distance);//0~400cm
// client.println(" cm");
// client.println("</html>");
break;
}
if (c == '\n') {
// you're starting a new line
currentLineIsBlank = true;
} else if (c != '\r') {
// you've gotten a character on the current line
currentLineIsBlank = false;
}
}
}
// give the web browser time to receive the data
delay(1000);
// close the connection:
client.stop();
Serial.println("client disconnected");
}
}
void printWifiStatus() {
// print the SSID of the network you're attached to:
Serial.print("SSID: ");
Serial.println(WiFi.SSID());
// print your board's IP address:
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");
Serial.println(ip);
// print the received signal strength:
long rssi = WiFi.RSSI();
Serial.print("signal strength (RSSI):");
Serial.print(rssi);
Serial.println(" dBm");
}
interesting to know that checksum computes. Maybe then the rest of the code doesn’t proceed correct, when it reads the values, becuase when 1st byte is 0xFF it double prints output. However when it has two times the 0xFF it outputs the ERROR. The output is on browser whn I hit the IP, so maybe serial doesnt matter.
Utrasonic.h is there because I have also tried other ultrasonic sensor with similar code tha works (but it doesnt need UART but only pin 3)
you reading bytes at 9600 baud and printing textual information at 19200baud
you are probably overrunning the Serial1 input buffers and loosing information
try
Thanx for help so far. I ll try to concentrate to the read code, no need to remove the other code, it works with other sensor brand. I think the loop is wrong. in order to test the while loop needs to read till 0xFF, so it adds one more read.
I am not sure what serial1.flush does there, since it seems to work as an OUT statement, I don’t get it.
I think I ll just scan for 0xFF, then read next 3 bytes and just go for evaluation. I am not a programmer but I manage in the end It was great help you saw that actually checksum adds, somehow I thought it way off (without calculating… )
HI it works now. One problem I have is that changes in distance are really really slow… It takes upto 2 minutes for the change to be shown in the program… It would be nice to know any ideas on this but I could possibly use it that way, I want to measure my oil tank. I double checked and read of the serial1 happens every on second.
EDIT: I think I need somehow to clear the UART buffer before reading. Any ideas?
It was great help you saw that actually checksum adds, somehow I thought it way off (without calculating… )