From eaac4532d14ade749bd79b1e5b786e1e5906e213 Mon Sep 17 00:00:00 2001
From: "Omar2.Zayed@live.uwe.ac.uk" <omar2.zayed@live.uwe.ac.uk>
Date: Wed, 16 Apr 2025 17:15:16 +0000
Subject: [PATCH] the final code for every question
---
final code for task 3 | 86 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 86 insertions(+)
create mode 100644 final code for task 3
diff --git a/final code for task 3 b/final code for task 3
new file mode 100644
index 0000000..653ba3d
--- /dev/null
+++ b/final code for task 3
@@ -0,0 +1,86 @@
+#include "mbed.h"
+#include "arm_book_lib.h"
+
+DigitalIn key2(D2);
+DigitalIn key3(D3);
+DigitalIn gasSensor(D4);
+DigitalIn tempSensor(D5);
+
+DigitalOut alarmLed(LED1);
+UnbufferedSerial uart(USBTX, USBRX);
+
+bool debounce(DigitalIn& button);
+void sendStatus();
+void checkWarnings();
+
+bool alarmState = false;
+bool previousGas = false;
+bool previousTemp = false;
+
+int main()
+{
+ key2.mode(PullDown);
+ key3.mode(PullDown);
+ gasSensor.mode(PullDown);
+ tempSensor.mode(PullDown);
+
+ uart.baud(115200);
+ uart.format(8, SerialBase::None, 1);
+
+ while (true) {
+ if (debounce(key2)) {
+ const char* msg = gasSensor ? "\r\nGas detected.\r\n" : "\r\nGas not detected.\r\n";
+ uart.write(msg, strlen(msg));
+ }
+
+ if (debounce(key3)) {
+ const char* msg = tempSensor ? "\r\nHigh temperature detected.\r\n" : "\r\nTemperature normal.\r\n";
+ uart.write(msg, strlen(msg));
+ }
+
+ alarmState = gasSensor || tempSensor;
+ alarmLed = alarmState;
+
+ sendStatus();
+ checkWarnings();
+
+ ThisThread::sleep_for(1s);
+ }
+}
+
+bool debounce(DigitalIn& button)
+{
+ if (button.read()) {
+ ThisThread::sleep_for(150ms);
+ return button.read();
+ }
+ return false;
+}
+
+void sendStatus()
+{
+ const char* alarmMsg = alarmState ? "ON" : "OFF";
+ const char* gasMsg = gasSensor ? "DETECTED" : "CLEAR";
+ const char* tempMsg = tempSensor ? "HIGH" : "NORMAL";
+
+ char buffer[80];
+ sprintf(buffer, "\r\n[STATUS] Alarm: %s | Gas: %s | Temp: %s\r\n", alarmMsg, gasMsg, tempMsg);
+ uart.write(buffer, strlen(buffer));
+}
+
+void checkWarnings()
+{
+ bool currentGas = gasSensor.read();
+ bool currentTemp = tempSensor.read();
+
+ if (currentGas && !previousGas) {
+ uart.write("\r\n[WARNING] Gas level exceeds safe limit!\r\n", 42);
+ }
+
+ if (currentTemp && !previousTemp) {
+ uart.write("\r\n[WARNING] Temperature exceeds safe limit!\r\n", 47);
+ }
+
+ previousGas = currentGas;
+ previousTemp = currentTemp;
+}
--
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