Road accidents are one of the leading causes of injuries and fatalities, and in many situations the biggest issue is the lack of immediate response after a crash occurs. Victims may be unconscious, unable to contact anyone, or left without help for critical minutes. Advanced crash detection and emergency systems are usually available only in expensive vehicles or premium mobile ecosystems, making such safety features inaccessible for many everyday Android users. Delayed communication, lack of live monitoring, and absence of quick emergency alerts can greatly increase the severity of accident situations.
While building Cradet, we faced several technical and real-world challenges. One of the biggest difficulties was integrating Firebase smoothly between the Android application and the website dashboard for real-time synchronization of alerts, crash data, and monitoring information. Another major challenge was handling smartphone sensor data accurately. The accelerometer and gyroscope sensors were highly sensitive and initially generated false crash alerts even during small movements or sudden phone rotations. Calculating proper G-force values and balancing the sensor sensitivity to differentiate between normal motion and actual accidents required continuous testing and optimization.
To solve these problems, we developed Cradet as a smart multi-sensor crash detection and emergency response ecosystem that combines an Android application with a live website dashboard connected through Firebase. Instead of relying on a single trigger, the system uses GPS speed tracking, accelerometer readings, gyroscope motion analysis, Bluetooth wearable connectivity, and RSSI proximity signals to improve crash detection accuracy and reduce false alerts. We optimized the sensor thresholds and implemented G-force based calculations to better identify real accident scenarios while filtering normal movements and device rotations.
When a possible accident is detected, Cradet immediately activates a 20-second emergency countdown that allows the user to cancel false alarms. If there is no response, the app automatically sends an SOS SMS along with the user’s live location to saved emergency contacts for faster assistance. Even after the alert has been sent, the user can still confirm that they are safe, which triggers a follow-up message such as “I am safe” to reduce panic and prevent unnecessary emergency responses. The connected Firebase-powered website dashboard provides real-time monitoring, live alert updates, wearable connection status, crash analytics, and crash heat map visualization to identify accident-prone areas and improve road safety awareness. Our goal with Cradet is to create an affordable, accessible, and intelligent safety system that brings advanced crash detection technology to everyday Android users using devices they already own.
APK FILE LINK: https://drive.google.com/file/d/1WxBQcUBpnTLieFXJaOqR21aptZxVjj9w/view?usp=sharing WEBSITE/DASHBOARD LINK: https://cradetv3.onrender.com/ DEMO VIDEO LINK: https://youtu.be/Gph9slBnYnU