I use a feasy beacon device , with an iOS application , but I face an issue with the RSSI signal ,
if the device is beside the iPhone I receive the signal , but if there is a space between the iPhone and the beacon (from 20 cm to 100 cm) I didn't receive the signal .
my beacon setting is :
interval : 100 ms
TxPower : -19.5
Key (ms) : 100-35000
TLM is On
RSSI at 1m : -3
any recombination to modify the setting to receive the signal on 1 meter distance .
A transmitter power of -19 dBm is very low and won't be detected for more than a few centimeters. Try a stronger setting. A typical iBeacon has txPower set to +2 dBm.
When the detected RSSI of an iBeacon signal on an iPhone drops below -90 dB, it gets reported as an RSSI of 0. The reason you see this level is because it is barely being detected.
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I my case I am trying to act my device as beacon and tried to set the txpower I want my beacon to get disappear from Locate App whenever I am out of its range so I tried setting the txpower distance for 1 meter but even after I go out of range of my beacon let's say 3-4 meter I still see my beacon on Locate App even though I have set it for 1 meter because it has rssi power which always varies which actually does the signal transmission part, I tried setting hardcode rssi power but still after seeing the beacon on Locate App it varies and when I am at distance of 3-4 meter I am able to see my beacon on Locate App.
Below is my code where I am trying to set my beacon.
Beacon beacon = new Beacon.Builder()
.setId1("2f234454-cf6d-4a0f-adf2-f4911ba9ffa6")
.setId2(String.valueOf(major))
.setId3(String.valueOf(minor))
.setManufacturer(0x004C)
.setTxPower(-84)
.setRssi(-49)
.setDataFields(Arrays.asList(new Long[]{0l}))
.build();
BeaconParser beaconParser = new BeaconParser()
.setBeaconLayout("m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24");//
beaconTransmitter = new BeaconTransmitter(this, beaconParser);
beaconTransmitter.startAdvertising(beacon, new AdvertiseCallback() {
#Override
public void onStartFailure(int errorCode) {
Log.e("Class", "Advertisement start failed with code: " + errorCode);
}
#Override
public void onStartSuccess(AdvertiseSettings settingsInEffect) {
Log.i("class", "Advertisement start succeeded."+settingsInEffect.getTxPowerLevel());
Log.i("class", "Advertisement start succeeded."+settingsInEffect);
}
});
You need to calibrate your transmission power such that the BLE signal does not transmit further than a metre (or whatever your limit is). Different devices have different hardware with different behaviour so there is no exact transmission power which will transmit in a 1 m range if it was set for any BLE device. Also, the RSSI is a measured value which must vary as the distance between the transmitter and receiver is varied. The RSSI value that is set is a value used by other devices that sense the beacon, to calibrate the calculations those devices do which involve the beacon. For example, you could set the RSSI to a value which is the approximate measured RSSI when the beacon is 1 m away from the receiver. This could assist with the calculation of distance from the beacon when sensing the beacon with different receivers.
My HM-10 BLE connects to Samsungs and Iphones. But when I want to see the real distance from the phone to the Beacon, then only Iphone apps (e.g Locate Beacon) show the actual distance. Samsung apps always show 0.08 or 0.09 meters to the Beacon. Any help? Thanks.
Picture from Locate Beacon app:
enter image description here
This sounds like a problem with your Samsung phone. The RSSI should become increasingly negative as you get further away. It should not say -47 or -49 at 5 meters away or more... There is no way the signal is that strong at such a distance. Once you get to 20 or more meters away the RSSI should drop closer to -90 and then reach about -100 before no longer detecting the beacon. If it does not do this, then the phone has a faulty RSSI sensor of firmware that decodes its value.
My bluetooth chip (SOC) has tx power of -6 to +8dbm and receive sensitivity of -93dbm. But my chipset manufacturer is saying max range possible is 40-50 meters only. Why is this the case? I thought BLE devices were capable of up to 100 meters. What else can I improve in the circuit to increase the range? Appreciate your help.
I've got an Arduino with an ATmega328 processor. It can be operated at 3.3V which nets a clock signal frequency of about 12 MHz respectively 16 Mhz at 5V.
I connected an IMU to the Arduino which runs an AHRS algorithm turning accelerometer, gyroscope and magnetometer data into orientation data.
What does the higher frequency of 16 MHz actually mean in this context?
Will the AHRS be calculated faster so I get a lower latency? Can I poll the sensors more often? I want a deeper understanding of what I'm doing here.
Higher frequency means more clock cycles per second which means more operations are done during the same duration of time. This means AHRS runs faster and you will achieve a lower latency and if you are repeatedly reading values from the IMU, you will be able to poll more often.
I understand that Bluetooth Low energy(BLE) client scan for BLE peripherals. I want to know, how far,in meters, a BLE client can scan/discover a BLE peripheral.
An iPhone 5 will detect a RadBeacon USB (BLE Beacon) set at maximum transmit power about 40 meters away. At greater distances of up to 50 meters, it might be intermittently detected, but detections are not reliable. Outdoors with clear line of sight, it can sometimes be detected at even greater distances of up to 100 meters, but again this is not reliable.
This is typical, but just an example. The specifics depend on the transmitting device, the receiving device, any physical obstructions, and how much radio noise is in the area.