Overview
The use of iBeacon beacons for student attendance and employee check-in and clock-in applications is becoming more and more popular. The principle is based on the scanning of the host (mobile phone Bluetooth) and the broadcast of the slave (iBeacon base station). There is no need to establish a Bluetooth connection to achieve one-way communication. data transmission. The APP installed on the mobile phone of employees or students scans the broadcast signal of the fixedly deployed iBeacon Bluetooth beacon device to implement the check-in and clock-in function. Mobile phones that are not within the Bluetooth signal coverage of the iBeacon beacon cannot clock in, which also ensures the true effectiveness of the clock in.
The Bluetooth beacon is a hardware device based on the low-power Bluetooth BLE (Bluetooth 4.0 or above) broadcast protocol. As a BLE device, it is usually installed at a specific location indoors. As a reference point for the indoor location, it continuously broadcasts to the surroundings. It does not need to be connected to any host device. It only needs to be scanned and analyzed by the host device. The Bluetooth beacon of HoneyComm IoT has the following characteristics:
– Low power consumption, long standby time, no external power supply required;
– Easy to install. Just use 3M glue to install;
– Lower costs, reducing project budget;
– It has high compatibility and adaptability and can be used with most models on the market;
The relationship between Bluetooth beacon distance and signal strength RSSI:
d=10^((ABS(RSSI)-A)/(10*n)) ————- (1)
Where d is the distance, the unit is m.
RSSI is the signal strength of the Bluetooth beacon received by the mobile phone, which is a negative number.
A is the absolute value of the RSSI value received when the mobile phone is 1m away from the Bluetooth beacon.
n is the environmental attenuation factor, which needs to be tested and corrected.
The following figure is a graph based on A=63, n=1.56:
As can be seen from the above figure, the relationship between RSSI and distance is non-linear. When the distance exceeds 8 meters, RSSI is insensitive to changes in distance.
Check-in and attendance based on Bluetooth beacon:
When we use mobile APP to check in and clock in, due to differences in received signal strength of different mobile phones, signal obstruction, signal reflection, etc., we cannot simply reduce the signal strength transmitted by the Bluetooth beacon or use a single measured signal strength (RSSI ), our recommendations are as follows:
- Through actual testing, according to the punch-in distance required by the project and the signal strength value corresponding to the actual test, signal strength filtering is performed in the mobile APP.
- Carry out multiple signal measurements and take the one with the strongest signal strength as the basis for operation (because occlusion and other reasons will only cause the signal to become weaker, not stronger, so the credibility of a strong signal is higher).
Bluetooth Beacon Tag HCBB07 are mostly liked by many customers for projects.
Application Scenario examples:
HoneyComm Bluetooth tags HCBB07, HCBB16 are widely used in the following application scenarios:
- Use Bluetooth tag HCBB07 or HCBB16 and Bluetooth gateway HCBG01 for attendance management and monitoring management.
- Use Bluetooth beacon and Bluetooth + NB-IOT work card to automatically clock in. When the Bluetooth work crd scans the signal of the Bluetooth beacon, it is sent to the background server through NB-IOT for clocking in.
- Use a Bluetooth beacon combined with a mobile phone APP to check in. The Bluetooth beacon triggers the law enforcement instrument. When the law enforcement instrument reaches the vicinity of the Bluetooth beacon, the camera function is automatically turned on.
- The Bluetooth beacon triggers other applications (museums). When entering a certain distance near the Bluetooth beacon, it automatically triggers a specific operation (such as broadcasting an introduction to cultural relics, etc.)
Sometimes, some applications need the bluetooth gateway.
