Hi all
Background - I know a bit of programming but nothing in depth so apologies in advance for any glaring errors.
I have an issue with my code.
I have an UNO which is relaying joystick(potentionmeter) data that I want to send via serial to a ESP8266. This then sends the pot values to another ESP8266 via wifi to control a motor.
The issue is between the UNO and the serial connected ESP8266.
When I connect the serial ports together and do a simple serial.print with no other code(such as the wifi code) I get the values as expected between the UNO and the ESP8266.
However once I introduce the code to send this data to the second ESP8266 I get fragmented values.
For example
256
126
26
56
1
etc
I think I am introducing a serial read without allowing the serial buffer to finish but I don't know how to implement this into my code.
Please help if possible...this has me really stumped. I've tried serial.flush, writing 0 to the output value etc to no avail.
Thanks in advance.
Controller (UNO)
// //Sensor Assignments
int sensorPinY = A0; //Tank Forward,Reverse
int sensorPinX = A1; //Tank Track Left, Right
int sensorValueY = 0;
int sensorValueX = 0;
String xVal;
String yVal;
void setup() {
Serial.begin(9600);
}
void loop() {
// put your main code here, to run repeatedly:
sensorValueY = map(analogRead(sensorPinY),0,700,88,166); //Mapped Acceleration to be 0-10
sensorValueX = map(analogRead(sensorPinX),0,700,222,289); //Mapped Turn to be 11-20
//Serial.print("Y: ");
//yVal = String(sensorValueY);
Serial.println(sensorValueY);
Serial.print('\n');
//Serial.print("X: ");
//xVal = String(sensorValueX);
Serial.println(sensorValueX);
Serial.print('\n');
//delay(); //Update 100MS
}
ESP8266 Recieving Serial Data
#include <ESP8266WiFi.h>
const char *ssid = "tankcontrol";
const char *password = "k1a1tank";
int outputValue = 0;
String teststring = "";
void setup() {
Serial.begin(9600);
delay(10);
// //We start by connecting to a WiFi network
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
// /* Explicitly set the ESP8266 to be a WiFi-client, otherwise, it by default,
// would try to act as both a client and an access-point and could cause
// network-issues with your other WiFi-devices on your WiFi-network. */
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
void loop() {
// read the analog in value:
//teststring = Serial.readStringUntil('\n');
outputValue = Serial.parseInt();
delay(5);
// print the results to the Serial Monitor:
Serial.println(outputValue);
// Serial.println(teststring);
// // Use WiFiClient class to create TCP connections
WiFiClient client;
const char * host = "192.168.4.1";
const int httpPort = 80;
if (!client.connect(host, httpPort)) {
Serial.println("connection failed");
return;
}
// // We now create a URI for the request
// outputValue = teststring.toInt();
String url = "/data/";
url += "?sensor_reading=";
url += outputValue;
Serial.print("Requesting URL: ");
Serial.println(url);
// // // This will send the request to the server
client.print(String("GET ") + url + " HTTP/1.1\r\n" +
"Host: " + host + "\r\n" +
"Connection: close\r\n\r\n");
unsigned long timeout = millis();
while (client.available() == 0) {
if (millis() - timeout > 5000) {
// Serial.println(">>> Client Timeout !");
client.stop();
return;
}
}
Serial.println();
Serial.println("Closing connection");
Serial.println();
Serial.println();
Serial.println();
delay(5);
}