O Level Exam : Practical Question
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⚡ Java Script
// C++ code // int moisture = 0; void setup() { pinMode(A0, OUTPUT); pinMode(A1, INPUT); Serial.begin(9600); pinMode(8, OUTPUT); pinMode(9, OUTPUT); pinMode(10, OUTPUT); pinMode(11, OUTPUT); pinMode(12, OUTPUT); } void loop() { // Apply power to the soil moisture sensor digitalWrite(A0, HIGH); delay(10); // Wait for 10 millisecond(s) moisture = analogRead(A1); // Turn off the sensor to reduce metal corrosion // over time digitalWrite(A0, LOW); Serial.println(moisture); digitalWrite(8, LOW); digitalWrite(9, LOW); digitalWrite(10, LOW); digitalWrite(11, LOW); digitalWrite(12, LOW); if (moisture < 200) { digitalWrite(12, HIGH); } else if (moisture < 400) { digitalWrite(11, HIGH); } else if (moisture < 600) { digitalWrite(10, HIGH); } else if (moisture < 800) { digitalWrite(9, HIGH); } else { digitalWrite(8, HIGH); } delay(100); // Wait for 100 millisecond(s) }
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