Diff: main.cpp

Revision:

0:b9712fa89244

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Feb 14 00:31:34 2020 +0000
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+/**********************************************************************
+ ESP-01 BOARD RELAY CONTROL
+ ==========================
+AT+RST Reset ESP-01
+AT+CWMODE Set ESP-01 mode (here it is set to Station mode)
+AT+CWJAP Set Wi-Fi ssid name and password
+AT+CPIMUX Set connection mode (here it is set to multiple connection)
+AT+CIFSR Returns the IP address (not used here)
+AT+CIPSTART Set TCP or UDP connection mode, destination IP address, and port number (here, UDP is used
+with port number set to 5000. Destination IP address is set to “0.0.0.0” so that any device can
+connect and send data over Port 5000).
+
+
+Testing the Program
+The program can easily be tested with a mobile phone. You should install this app in the Play Store 
+UDPSender by hastarin 
+
+The steps to test the program are as follows:
+• Construct the circuit.
+• Compile and download the program to your development board.
+• Start the UDP Server apps on your mobile phone and set the Port number to 5000 and the
+destination IP address (ESP-01 IP address, which was 192.168.1.160 in this project). 
+
+Enter command ON1 followed by the Enter key (required for the scanf function) on the mobile
+phone. Click Send to send the command to the development board. Relay 1 should now
+become active and the red LED corresponding to this relay will turn ON
+
+**********************************************************************/
+#include "mbed.h"
+//
+// Define the expansion board to development board UART connections
+//
+#define TX PB_6//PA_9 // UART TX
+#define RX PB_7//PA_10 // UART RX
+//Serial esp(TX, RX); // UART TX,RX
+Serial esp(PA_2,PA_3);
+//Serial esp(PB_6,PB_7); // tx, rx
+//
+// Configure all relays as outputs and de-activate all relays
+//
+DigitalOut Relay1(PC_0, 1);
+DigitalOut Relay2(PC_1, 1);
+DigitalOut Relay3(PC_2, 1);
+DigitalOut Relay4(PC_3, 1);
+//
+// This function connects to the Wi-Fi
+//
+void ConnectToWiFi()
+{
+    esp.printf("AT+RST\r\n");
+    wait(2);
+
+    esp.printf("AT+CWMODE=1\r\n");
+    wait(3);
+
+    esp.printf("AT+CWJAP=\"BTHomeSpot-XNH\",\"49346abaeb\"\r\n");
+    wait(10);
+
+    esp.printf("AT+CPIMUX=1\r\n");
+    wait(3);
+
+    esp.printf("AT+CIFSR\r\n");
+    wait(3);
+
+    esp.printf("AT+CIPSTART=\"UDP\",\"192.168.1.178\",0,5000,2\r\n");
+    wait(3);
+}
+int main()
+{
+    char Buffer[80]; // Buffer to store data
+    esp.baud(115200); // Set baud rate to 115200
+    ConnectToWiFi(); // Connect to Wi-Fi
+// Receive data packets over UDP and activate/de-activate the
+// required relay. Function strstr(a,"b") returns a value greater than
+// 0 if string a contains sub-string "b". The command sent by the
+// mobile devuce must be terminated with an Enter key (required for
+// the scanf function). Buffer is cleared at the beginning of the loop
+//
+    while(1) {
+        for(int k = 0; k < 5; k++)Buffer[k] = 0;
+
+        esp.scanf("%s",&Buffer);
+        if(strstr(Buffer, "ON1") > 0) Relay1 = 0;
+        else if(strstr(Buffer,"ON2") > 0) Relay2 = 0;
+        else if(strstr(Buffer, "ON3")> 0) Relay3 = 0;
+        else if(strstr(Buffer, "ON4") > 0) Relay4 = 0;
+        else if(strstr(Buffer, "OFF1") > 0)Relay1 = 1;
+        else if(strstr(Buffer, "OFF2") > 0)Relay2 = 1;
+        else if(strstr(Buffer, "OFF3") > 0)Relay3 = 1;
+        else if(strstr(Buffer, "OFF4") > 0)Relay4 = 1;
+    }
+}
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