This project creates a low-power security system specifically designed for RVs, motorhomes, and campers. When motion is detected inside or around your vehicle, the system sends an SMS alert to your phone and can trigger an alarm. The system is designed for low power consumption to preserve battery when off-grid.<\/p>\n
Difficulty:<\/strong> Intermediate One or more PIR sensors monitor entry points and interior of the RV. When motion is detected, the ESP32 wakes from deep sleep, sends an SMS via GSM module, sounds a siren (if enabled), and logs the event. The system uses deep sleep to conserve battery when not active, waking only when motion is detected.<\/p>\n \u8868<\/p>\n This RV security system provides peace of mind when camping or storing your vehicle. With SMS alerts, you'll know immediately if someone enters your RV.<\/p>\n","protected":false},"excerpt":{"rendered":" Project Overview This project creates a low-power security system specifically designed for RVs, motorhomes, and campers. When motion is detected inside or around your vehicle, the system sends an SMS alert to your phone and can trigger an alarm. The system is designed for low power consumption to preserve battery when off-grid. Difficulty: Intermediate Estimated […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-3932","post","type-post","status-publish","format-standard","hentry","category-projects"],"blocksy_meta":[],"yoast_head":"\r\n
\nEstimated time:<\/strong> 2-3 hours
\nEstimated cost:<\/strong> $35-50<\/p>\nHow It Works<\/h2>\n
Materials Needed<\/h2>\n
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Circuit Diagram<\/h2>\n
Connection Table<\/h3>\n
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Component<\/th>\n Pin<\/th>\n ESP32 Pin<\/th>\n<\/thead>\n \nInterior PIR<\/th>\n OUT<\/th>\n GPIO 4<\/th>\n Exterior PIR<\/th>\n OUT<\/th>\n GPIO 5<\/th>\n SIM800L<\/th>\n TX<\/th>\n GPIO 16<\/th>\n SIM800L<\/th>\n RX<\/th>\n GPIO 17<\/th>\n Buzzer\/Siren<\/th>\n Positive<\/th>\n GPIO 2<\/th>\n Status LED<\/th>\n Anode<\/th>\n GPIO 15<\/th>\n<\/tbody>\n Arduino Code<\/h2>\n
\/\/ RV Security System with SMS Alerts\n#include <WiFi.h>\n#include <SoftwareSerial.h>\n\n\/\/ Pin definitions\nconst int interiorPirPin = 4;\nconst int exteriorPirPin = 5;\nconst int sirenPin = 2;\nconst int ledPin = 15;\n\n\/\/ GSM module\nSoftwareSerial gsm(16, 17); \/\/ RX, TX\n\n\/\/ Configuration\nconst char* phoneNumber = \"+1234567890\"; \/\/ Emergency contact\nbool armed = true;\nunsigned long lastAlertTime = 0;\nconst unsigned long alertCooldown = 600000; \/\/ 10 minutes between SMS\n\nvoid setup() {\n Serial.begin(115200);\n gsm.begin(9600);\n \n pinMode(interiorPirPin, INPUT);\n pinMode(exteriorPirPin, INPUT);\n pinMode(sirenPin, OUTPUT);\n pinMode(ledPin, OUTPUT);\n \n digitalWrite(sirenPin, LOW);\n digitalWrite(ledPin, LOW);\n \n Serial.println(\"RV Security System Starting...\");\n \n \/\/ Initialize GSM\n sendATCommand(\"AT\", 1000);\n sendATCommand(\"AT+CMGF=1\", 1000);\n sendATCommand(\"AT+CNMI=2,2,0,0,0\", 1000);\n \n Serial.println(\"System Ready\");\n Serial.println(\"Waiting 60 seconds for PIR warm-up...\");\n delay(60000);\n \n \/\/ Send startup notification\n sendSMS(\"RV Security System ONLINE\");\n}\n\nvoid sendATCommand(String cmd, int timeout) {\n gsm.println(cmd);\n delay(timeout);\n while (gsm.available()) {\n Serial.write(gsm.read());\n }\n}\n\nvoid sendSMS(String message) {\n gsm.print(\"AT+CMGS=\\\"\");\n gsm.print(phoneNumber);\n gsm.println(\"\\\"\");\n delay(500);\n gsm.print(message);\n delay(500);\n gsm.write(26);\n delay(3000);\n Serial.println(\"SMS sent\");\n}\n\nvoid activateAlarm(String location) {\n if (millis() - lastAlertTime > alertCooldown) {\n lastAlertTime = millis();\n \n Serial.printf(\"ALARM: Motion detected at %s!\\n\", location.c_str());\n \n \/\/ Send SMS\n String msg = \"ALERT: Motion detected at \" + location + \" in your RV!\";\n sendSMS(msg);\n \n \/\/ Sound siren (if armed)\n if (armed) {\n for (int i = 0; i < 10; i++) {\n digitalWrite(sirenPin, HIGH);\n digitalWrite(ledPin, HIGH);\n delay(200);\n digitalWrite(sirenPin, LOW);\n digitalWrite(ledPin, LOW);\n delay(200);\n }\n }\n }\n}\n\nvoid loop() {\n bool interiorMotion = digitalRead(interiorPirPin) == HIGH;\n bool exteriorMotion = digitalRead(exteriorPirPin) == HIGH;\n \n if (armed) {\n if (interiorMotion) {\n activateAlarm(\"Interior\");\n }\n if (exteriorMotion) {\n activateAlarm(\"Exterior\");\n }\n }\n \n delay(100);\n}\n<\/code><\/pre>\nLow-Power Battery Version with Deep Sleep<\/h2>\n
#include <esp_sleep.h>\n\nRTC_DATA_ATTR bool alarmSent = false;\nRTC_DATA_ATTR unsigned long lastWakeTime = 0;\n\nvoid setup() {\n Serial.begin(115200);\n \n pinMode(interiorPirPin, INPUT);\n pinMode(exteriorPirPin, INPUT);\n pinMode(sirenPin, OUTPUT);\n pinMode(ledPin, OUTPUT);\n \n esp_sleep_enable_ext0_wakeup((gpio_num_t)interiorPirPin, 1);\n esp_sleep_enable_ext1_wakeup((1ULL << exteriorPirPin), ESP_EXT1_WAKEUP_ANY_HIGH);\n \n if (esp_sleep_get_wakeup_cause() != ESP_SLEEP_WAKEUP_UNDEFINED) {\n \/\/ Woken by motion\n bool interior = digitalRead(interiorPirPin) == HIGH;\n bool exterior = digitalRead(exteriorPirPin) == HIGH;\n \n if (!alarmSent) {\n \/\/ Initialize GSM\n gsm.begin(9600);\n sendATCommand(\"AT\", 1000);\n sendATCommand(\"AT+CMGF=1\", 1000);\n \n String location = interior ? \"Interior\" : \"Exterior\";\n sendSMS(\"ALERT: Motion detected at \" + location + \" in RV!\");\n \n alarmSent = true;\n \n \/\/ Flash LED for 5 seconds\n for (int i = 0; i < 10; i++) {\n digitalWrite(ledPin, HIGH);\n delay(250);\n digitalWrite(ledPin, LOW);\n delay(250);\n }\n }\n }\n \n \/\/ Reset alarm flag after 1 hour\n if (millis() - lastWakeTime > 3600000) {\n alarmSent = false;\n }\n lastWakeTime = millis();\n \n esp_deep_sleep_start();\n}\n<\/code><\/pre>\nInstallation Steps<\/h2>\n
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Project Extensions<\/h2>\n
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Troubleshooting<\/h2>\n
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Conclusion<\/h2>\n