I am working with HM10 BLE chip with Arduino. I am able to establish serial communication between the two. In the manufacturer manual from jnhuamao.cn, it says that for AT+DISC? , "...Before V535 max results is 6, Since V535 not limit"
AT+DISC? is the AT command for scanning nearby BLE devices. The firmware for my chips are V539 and V540.
However, I am only able only received maximum 6 devices as scan result in the serial monitor. And they are different everytime. (I have 8 chips powered up nearby). Has anyone ran into the same problem? What could be the problem? What might be the solutions?
THANKS A LOT
the number of discoverable devices for hm-10 is 6 devices in one go.
its in their datasheet.
Even im facing a similar issue.
Im looking for something that will give me upto 20 devices in the scann results.
Related
I'm making a project with Esp32 whroom, so I bought the yj-16009 iBeacon DataSheet and I'm trying to get it to work as wireless Bluetooth proximity sensor like in this Video
I used the this code from the video and the esp32 is monitoring and showing BLT scanning results like this the results shown are after I turned off any BLT device around so first I don't understand what it is reading, and second after I turn on the iBeacon the results remain with the same range of numbers no matter if I get the iBeacon closer or farther, therefor I came to the conclusion that it doesn't recognize the iBeacon sensor for some reason.
I also download an app named LightBlue which does recognize the iBeacon sensor.
My question is if anyone knows how to make the esp32 recognize the iBeacon sensor. Another thing I tried to find any information about this sensor and there is no info about it anywhere. I have read on other questions here that it might need to be programmed somehow which I don't know how to do because there is no info online. So if anyone is familiar with this kind of sensor and can help me figure how to make the ibeacon to work like the video above as a Bluetooth Proximity device it would be a blessing.
The code you reference is just scanning for any BLE advertisements (iBeacon or otherwise) and printing out the RSSI signal strength of each detection. The reason you do not see the RSSI change when you move the beacon is because the ESP32 is probably picking up non-iBeacon adverts from your phone, laptop and other Bluetooth enabled devices in the vicinity which are not moving (there are more around you than you think!)
In order to make the device detect iBeacon only (and not all the other devices) you need to change the C code to do a few more things:
Access the bytes of the advertisement payload and use them as follows:
Compare the beginning of these bytes to see if they include the iBeacon byte sequence FF 4C 00 02 15
If the above byte sequence is not in the advertising data, ignore that detection — it is not an iBeacon advert
If it does include that byte sequence, decode the next 16 bytes as the iBeacon uuid, the next two bytes as the major and the next two bytes as the minor. See my answer here: What is the iBeacon Bluetooth Profile
Print out the identifiers along with the RSSI that the code already prints.
Hello Good People of the Internet!
First time asking...
I have a modern PC running Fedora 24 with a real-time patch (CCRMA audio tools) with an ASUS Essence STX II sterio sound card installed on PCIe. With it we run a playback/capture application. Also, we need to integrate CAN and BLE into the system and have a PCIe-card for each of these functions. The CAN PCIe card is from PEAK and the BLE card is an Intel 8260 M2 card that HP have put on a PCIe card (AFAIK).
With only the audio card installed it works fine (using ALSA as API). When the CAN and BLE is installed the following is observed:
Playback works as before.
One capture channel only returns zero (0) or minus one (-1) in all samples.
The other capture channel returns values in the range -2..2 and when applying our application signal processing low quality, but detectable, expected results are presented.
The ALSA API report no problems in setup and configuration.
CAN and BLE functions as expected.
Without any deeper PCIe experience I suspect that CAN and/or BLE PCIe cards jumble the mapping of the sound card functions.
Can someone:
- Tell me if my hunch is in the ballpark?
- Inform me on where I might go for information on how to rectify the problem?
- ...or, share a solution?
Thanks!
I am new to Arduino and I have 2 issues when I tried the BluetoothShieldDemo.
I can only send data from bluetooth module(through serial monitor) to phone but I cannot send from phone to bluetooth module(to display it in serial monitor). I used oscilloscope to check there is signal in the Arduino board RX pin but no data display in the serial monitor. I suspect it is an IO issue so I changed the IO from digital pin 6 and 7 to digital pin 2 and 3, then digital pin 4 and 5. But it is still not working. Then I change the code to use hardware serial (Serial1) and it is working now. I just wonder why it is not working with the SoftwareSerial.
Although I can send and receive data, I cannot change the bluetooth name. The bluetooth module has no response when the below commands are sent. Is it the bluetooth module is in some kind of locked mode? Or the command is different from manufacturer? The bluetooth module that I got has a single CSR 31A2 chip on it. But the other shield that I saw on the web has 2 chips and it is with CSR BC417.
Codes:
blueToothSerial.print("\r\n+STWMOD=0\r\n");
blueToothSerial.print("\r\n+STNA=BluetoothSlave\r\n");
blueToothSerial.print("\r\n+STOAUT=1\r\n");
blueToothSerial.print("\r\n+STAUTO=0\r\n");
delay(2000);
blueToothSerial.print("\r\n+INQ=1\r\n");
Thanks in advance!
1- When using SoftwareSerial, how are you declaring the pins (Input/Output)?, Are you pulling serial data right (giving it enough time between data transmission, but reading at the right time)?
2- Find the datasheet of your module and see what commands does it support.
I develop an Android application running on Motorola RAZR XT910 with OS version 4.0.4.
This application uses the Motorola_ICS_R2_sdkaddon_100 BluetoothGattService.jar and BluetoothGatt.jar libraries and communicates with Bluetooth
Low Energy Sensor Tags (TI CC2540,TI CC2541,Blue Radios Sensor Tags).
On Discovery procedure I always read the rssi value equal to 0 . I use the following code
to read the rssi value on receiving the Intent BluetoothDevice.ACTION_FOUND:
short rssi = intent.getShortExtra(BluetoothDevice.EXTRA_RSSI,(short) 0);
Also for non Bluetooth low energy devices,the rssi value i read is ok (not equal to 0).
Can anyone help me??
thanks
I found a similar issue on the TI discussion site for using the Vender Specific query for RSSI. It seems that it works for Classic BT but returns an error code of 2 for BLE.
http://e2e.ti.com/support/low_power_rf/f/660/t/289391.aspx
It might be a fundamental limit that you can't get the value. In your case, the getShortExtra might not return the error code (2) and just return a 0 as RSSI.
I am trying to figure out how the FORA d15b blood pressure monitoring system communicates via Bluetooth. I want to be able to eventually write an Android app that can receive blood pressure data from the device.
More specifically, I want to know the exact data to send to the device in order to request blood pressure information. I also want to know the data that the device sends out. However, I don't even know the format of the data being sent/received.
I know that FORA has a PC app that can communicate with the d15b device via Bluetooth but I don't know what information its sending/receiving over Bluetooth, and that's what I want to know.
Here is Bluetooth information I know about the d15b device:
Bluetooth Carrier Frequency: 2400MHz to 2483.5MHz
Bluetooth Modulation Method: GFSK, 1Mbps, 0.5BT Gaussian
Transmission Power: +3dBm to –20dBm; Power control 4 stage
Receiving Signal Range: -88dBm to -20 dBm
Receiver IF Frequency: 1.5MHz center frequency
Maximum Data Rate: Asynchronous:723.2kbps/57.6kbps;
Synchronous: 433.9kbps/433.9kbps
I'm struggling to even find a starting point. Any help is appreciated! Thanks in advance.
I am familiar with C, Java, and Arduino if that helps at all...
NOTE:
Unfortunately, I am new to Bluetooth. After doing some research, I am still pretty clueless on how to solve this problem. In the title, I say unknown Bluetooth device because I just want to be able to read what I/O of an unknown Bluetooth device, which in my case happens to be the d15b that I know nothing about. Sorry if the question has been addressed already or if this is an inappropriate place to post this question. I wasn't sure.
Bluetooth data is encrypted. So it's not possible to hack it easily.
Forget it.