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.
Related
TLDR:
Is there a way to create a hex value between 0x20 and 0x7E with 5 volts? Is there a cheap component on the market or circuit logic that can achieve this?
I'm not sure what the proper terminology for this is, but here's what I'm trying to do:
I have a bluetooth module connected to my pico via UART0 TX and UART0 RX. The use for this is a bit long to explain, but essentially, I want the bluetooth module to work without my pico attached to it. I have a device that outputs a signal, the pico reads the signal, then it tells the bluetooth module to transmit to the receiver. However, since the data to transmit isn't actually important, it makes sense to cut out the pico and simply have the bluetooth module read the signal directly then transmit.
I have the device that outputs exactly when I want, but it outputs the equivalent of 00 in hex. My computer is connected via bluetooth and can read it just fine. However, the pico, reading the input through RX, can't. I've found no way for micropython using UART to read 00 - UART.any() and UART.read() want a character, and 00 only corresponds to NULL.
So essentially, I need some way to transmit a hex value between 0x20 and 0x7E without using the raspberry pi pico. Is there some kind of component that is able to do this? In practice, the bluetooth module will be connected to 5V power with up to 5 amps.
Any idea on how to get the Pico to read 00 in hex through the RX pin is welcomed too. The purpose of this is to not need multiple Picos, since the receiver and the transmitter will be a good distance from each other.
I found the issue. The pico actually can accept 0 through the UART RX pin. The issue was me having a wire misplaced. My computer saw the 0 input which made me think the pico couldn't handle it, but in fact it was never receiving it. Thanks for the help Kotzjan. Would have been interesting to fake a value into the port though!
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.
I bought a HM-15 BLE bluetooth module and successefully connected to Arduino. I am able to sent At commands and I would like to use it for scanning for iBeacons and get their major and minor.
Using AT+DISC? I can see the beacon address but I cannot connect to it and now I am stuck on how to retrieve major and minor
Can you help me? Here is the datasheet of the module:
http://www.elecrow.com/download/bluetooth40_en.pdf
Thanks
Bluetooth beacons do not require a connection and you read the identifiers directly from the advertisement.
Read section 19, Start a discovery scan, and learn how to read and decode the bytes in the discovered peripherals. The exact byte layout varies for different beacon types. For AltBeacon, an open source beacon variant, you can see the byte layout here: https://github.com/AltBeacon/spec
To decode a proprietary beacon format, you will need to learn how that beacon layout differs from the example linked above.
Old question, but just for the record, you can use AT-DISI?
This will scan for beacons, including iBeacons and also AltBeacons. The response from HM-10 will include RSSI for each.
PS: I'm assuming HM-15 and HM-10 operate the same way. Probably not exactly a fully reasonable assumption.
I am bit stuck, how can I make my arduino record into .wav files?
The arduino is connected with a microphone, and am using the Arduino ADC.
Any ideas? Will I be able to play them back using my pc?
many question cross my head
1- Is this possible using an arduino Uno
2- Is this possile using just a microphone connected to the Arduino ADC
3- if yes how can i get the wav format.
The idea gonna be like this
Ardiuno microphone-->Uno ADC -->arduino (library making wav sound)--> Storing data to a an SD card connected via SPI or maybe (connecting a Raspberry as a storage device)
also another question:
4- Do I need an amplifier due to the act that analog output from the microphone is very weak so the ADC couldn't detect the variation
In another log i had seen that i should connect the microphone to a level shifter.And that cause of the analog output is AC so i have to make the negative wave as 0 (for 10 it ADC)
the zero point as 512 and the positive as 1024 (10 bit ADC).(really i'm not sure about this part)
doing some research i got this library "https://github.com/TMRh20/TMRpcm/wiki/Advanced-Features#recording-audio" which is supposed to do the job, I mean making some wav file from the analog input.
So any help would be appreciated
Thx in advance,
Salah Laaroussi
Yes, although a bit complex it is very possible to do this via an uno.
The biggest hurdles to overcome is the limited amount of RAM and the clock speed. You will have to setup twin buffers to handle writing to the SD card. Make sure the card has a high enough write speed or the entire program will come to a screeching halt as you will run out of memory.
apc mag has a great article detailing out the circuit and code.
http://apcmag.com/arduino-projects-digital-audio-recorder.htm/
There are many things you haven't prepared yet:
output of microphone (assuming you know about electronics: still requires a biasing circuit e.g. a resistor + capacitor).
the output of the microphone is still very weak (in the magnitude of mV), which Arduino is incapable of capturing so you need a pre-amplifier
the design of the pre-amplifier will also include DC offset which makes the output of the microphone all above 0VDC which is in the range of the Arduino ADC otherwise the arduino will capture only those above 0VDC.
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.