A low-power short-range wireless protocol.

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15 views

Avoiding heavy controller boards in a MEMS sensor circuit

I am very new to the circuit designing and the "Internet of things" world. I am trying to put together, for simulation purposes, a system that can pull information from a mems accelerometer sensor and ...
0
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0answers
50 views

HC-05 Bluetooth AT+INQ command not working

I have followed the directions from the site below for bluetooth comm between an Arduino board using the HC-05 and an smartphone. It works fine. The problem is that I need to measure the RSSI from my ...
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1answer
67 views

PCB chip/trace antenna located away from board edge?

I'm looking to design a system that will require a 2.4GHz antenna. The only problem is, every single reference design I find has the antenna situated on at least one board edge. Unfortunately due to ...
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2answers
49 views

Is BLE 4.1 backwards compatible to BLE 4.0 ? Can a phone with bluetooth 4.0 talk with a mote with BLE4.1?

BLE 4.1 is out and it could be considered the biggest news for internet of thing developers. I want to know if my mote with BLE 4.1 can interact with iPhone 6 which has Bluetooth 4.0.
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1answer
21 views

RFID reader and bluetooth connectivity

Can an RFID reader detect bluetooth device? I downloaded an application called RFID explorer on my phone. The application helps to get read by RFID readers. I switched on the bluetooth on my phone and ...
2
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1answer
57 views

Can Bluetooth beacon be detected while it's in motion?

I'm curious to know if smartphones can actually detect Bluetooth beacon which is in motion, say while driving. Can car A detects the beacon in car B if they pass each other? If yes, what is the speed ...
0
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1answer
28 views

Could a HM-10 be powered by a LiPo with LDO?

The HM-10 BLE module has a VDD range of 2V-3.7V. A fully charged 18650 could be 4.2V (even 4.4V?). Could a HM-10 be powered straight off a 18650? Are modules typically designed to run directly off a ...
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1answer
28 views

Security for Bluetooth 4.0

I know that bluetooth 4.0 is using layer level AES 128bit for security . There is something ,which basically is not clear to me. We are sending data to some BLE ...
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0answers
16 views

Calculating Bluetooth connection conflicts

I am trying to design a system that gets the maximum possible number of Bluetooth connections at one time. If I put 4 Bluetooth cards in one system How can I calculate the degree to which they will ...
0
votes
1answer
71 views

RN4020 data communication without MLDP

I want to transfer data from my Smartphone to the RN4020 Bluetooth module. The easiest way is to use MLDP service. But I don't want to use it as CMD/MLDP pin is connected to +3.3V. And the only way to ...
2
votes
1answer
269 views

2.4GHz antenna feed routed through pcb via?

I'm working on designing a BLE device, and have settled on using a chip antenna. It seems, however, that my BLE SoC is going to have to be on the underside of the board, which might be significantly ...
0
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0answers
23 views

Interfacing two BLE devices with no UI

I'm wondering what the best way to connect/pair two BLE devices which have no screen. Most applications with BLE use a smartphone, tablet, or computer as the central device, and in these cases it is ...
0
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1answer
54 views

Building a bluetooth buzzer

I'm hoping to build a simple bluetooth buzzer using a Serial Port BLE module: HM-10. When a slave connected to it, if the slave sends a certain predefined message, the buzzer sounds for one minute. ...
0
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1answer
57 views

Does Bluetooth 4 or 802.11b/g/n penetrate through walls better?

I'm thinking of building a signal beacon designed to be used indoors. The transfer speed isn't critical but range and penetrative ability are. Does anyone know if Bluetooth 4 or 802.11b/g/n might be ...
0
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0answers
37 views

Sending data from Atmega8 to Android through HC-06

I am building up a communication between Atmega8 and Android device through HC-06. The uC can read the comfortably. But when it sends data the received data is garbage. The baudrate of working UART is ...
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0answers
16 views

Not able to receive signal from bluetooth module on PC, works on mobile [migrated]

I am using an IR receiver with a baud rate 9600, which sends signal to a bluetooth module. I am able to see the data which is sent on a mobile device with a simple BT terminal application. However, ...
0
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0answers
28 views

Bluetooth serial to bluetooth audio module

I was looking to work with a bluetooth audio module but many of the available options are either very costly, unavailable in my region(India) or generally lack some features. What is commonly and ...
2
votes
1answer
68 views

How to make arduino GPIO to operate at 3.3v instead of default 5v

I am working on a project, I use arduino mega 2560 with system operating voltage of 5v, at the same time I have a Bluetooth module which operates at 3.3v is there any way to reduce my arduino output ...
0
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1answer
43 views

Two 2.4GHz radio modules (XBee+Bluetooth) on same PCB. How to minimize interference?

I'm designing a PCB with XBee radio module and a bluetooth module (RFDuino SMD with XBee 2mW Radio). Since both of these modules are using 2.4GHz, are there any special consideration about how to ...
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0answers
21 views

Bluetooth alternative to feed sensor data to mobile device

I want to create a small device which would contain a sensor and send the data from it to a mobile device (assuming Android platform here, but this does not have to be the case). I'm interested in ...
0
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1answer
40 views

What is the speed of a baud rate? - RN42

After wondering/researching about this for days, I finally ask this question: What is the speed (bits per second) of a bluetooth SPP RN-42 device? Is 1 baud = 1 bit (thus 9600 baud = 9600 bits per ...
0
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1answer
72 views

How do I get a chinese nRF51822 development kit running examples with an ST-link, Keil uVision?

I've been working at this for days with not much information out there to assist me in fixing my issues, so I figured I'd make a post here. I'm using a cheap chinese nRF51822 module and ...
0
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1answer
24 views

Can I tell if the HC-06 bluetooth is connected?

I seem to see that the HC-06 device behaves like a serial device with TX/RX. I also understand that this needs to be "connected" to a blue tooth master to send/receive data. Is there a way that I ...
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0answers
40 views

Bluetooth HC-05 to RN-42

In a project I have the original bluetooth module was an HC-05; however, their was an issue and I had to purchase a replacement. Sadly my local microcenter only had the Parallax RN-42 available. ...
0
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1answer
93 views

UART to Bluetooth

I seem to find only partial explanations regarding this question, I've used Bluetooth in previous projects but I plan to use it on an FPGA project. Currently The FPGA is connecting using a UART ...
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3answers
71 views

Is there a way to change baud rate of a Bluetooth module wireless?

Or is there any other trick to do it? I need to change a baud rate of my Bluetooth module, I have tried it via Windows Bluetooth settings of the particular Bluetooth device, but that doesn't work. ...
7
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1answer
142 views

Should the unused areas on the top layer of my RF PCB have ground pours?

I realize there are some questions that are related to this topic but I didn't see any that are really RF specific. I am working on a 2-layer Bluetooth module and I have some unused spaces on the top ...
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0answers
54 views

Strange problem HC-06 Bluetooth module not responding after 2 minutes or less

I'm trying to send data over bluetooth from my android application to my pic16f877 via hc 06 bluetooth module . I'm able to connect to my hc 06 module and turn led on & off (by sending 2 string ...
0
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1answer
23 views

SPBT2632C2A Operating Voltage Related

It the SPBT2632C2A compatible with a 3.3v Logic System? I was thinking of using it with a BeagleBoneBlack, Absolute maximum rating is rated for 5.5v, So i can feed the module power from a LM1117-3.3 ...
0
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1answer
62 views

Can HC-06 be used as a Bluetooth server to which multiple devices can connect?

Title sums it up. I want to use my AVR to be a bluetooth server for multiple Android devices. Is it possible? If iy is not what other method can be used to achieve this?
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1answer
38 views

Can bluetooth be used in an application of notifying people when their friends are near them, assuming both have bluetooth enabled devices [closed]

I have a project. I want to make people aware that their friends are near them without using any internet. Is bluetooth a better option? Or is there anything better than this?
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1answer
68 views

After research, how should I go about creating a bluetooth peripheral?

My goal is to create a very simple (1 input, 1 output, both high / low states) bluetooth peripheral to be worn on the wrist to connect to an android phone running Lollipop. I have the following ...
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160 views

Serial AT commands with Bluetooth CSR8645 module

I bought a Csr8645 (bleutooth audio module). The module connect to my phone out of the box... It should support some AT commands. So I have tried some but I don't get anything in response. The only I ...
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46 views

Connecting a USB device as a Bluetooth slave

I'm trying to connect my Android phone to a USB gamepad via Bluetooth. I'd need a Bluetooth slave with a USB female port. I've done some searching and some asking, but I can't find any devices that do ...
0
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0answers
37 views

Should the output of a USB-UART module linked to a bluetooth module the same than just the USB-UART module just wired?

I have a device controled by a UART protocol just conected to my PC. I wanted to make it wireless, so I tried to create this conexion scheme PC -> USB-UART -> Bluetooth module -> Bluetooth module ...
-4
votes
1answer
34 views

Battery Cell Properties [closed]

I have a pair of Bluetooth headphones with a 3.7v, 180mA battery cell. I am wondering if it would be possible to increase the battery cell by replacing it with maybe a 5v or 9v. However I don't want ...
0
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0answers
36 views

BLE mini read not working

I recently brought a ble mini and configured it correctly updated my firmware. I am using asus zenfone 5 and android version 4.4.2. I am trying to use the simple chat program. I am able to send data ...
-1
votes
1answer
202 views

Can a Bluetooth wireless connection bridge a USB Host and USB device?

Now that Bluetooth modules are dirt cheap, I'm wondering if I could make a pair of wirelessly connected objects that would act as a "virtual USB cable". One would have a pig tail with a USB Male plug ...
0
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1answer
40 views

Use of RFID or suitable alternative to remotely communicate change in system state

I have a physical system which is dispersed over about 20-30 metres cubed and at random points within this space there are electronic nodes which have single binary outputs. I want to monitor every ...
-3
votes
2answers
128 views

Connecting to Wifi over Bluetooth for embedded systems

I know that these two (Wifi and Bluetooth) are in the same range of frequency (2.4 ghz. At least mine ones are this way). I do not think wifi modules for embedded systems (I use AVR) are cost ...
0
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0answers
21 views

multiple bluetooth on same board

I am designing a board with 2 bluetooth modules. Will this raise issues for EMI certifications and such. Since, there are 2 bluetooth chips on the same board. Will there be a collision and such with 2 ...
0
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1answer
70 views

Arduino mini bluetooth module communicating with an Android device without using an app?

Is there a way to communicate between arduino device and the android device through the bluetooth? I know it is and for that is used some pfodApp, but what if I ...
1
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1answer
37 views

Adding bluetooth input to old stereo

I am adding a bluetooth receiver to an old suitcase style record player / am radio. I have a bluetooth receiver which runs of 5v (usb normally). I have connected this to the volume pot, through the ...
1
vote
1answer
68 views

Is CE marking on module necessary?

Suppose a RF module has passed CE EMC tests. Must the CE marking be printed on the module itself in order for the approval to be valid if it is to be used in an end product?
0
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1answer
146 views

Quectel m66 bluetooth usage?

I've been working on m66 and got it connected to PC via usb to serial converter, and got it up and running. AT command replies with ...
0
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0answers
23 views

How is proximity unlocking by BlueTooth actually done?

Examples for proximity unlocking (i.e., no buttons need to be pressed) are: Kevo Tesla Keyfob How is this actually done, talking BlueTooth details? My research so far suggests the following: ...
3
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1answer
82 views

How to ensure a RF module is indeed FCC compliant as advertised?

Suppose a buyer buys RF modules from China and wants to ascertain that they're indeed FCC compliant as advertised. I'm guessing that this should be a fairly common issue since Chinese ...
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1answer
65 views

Which is the better way to send a broadcast signal to a great number of smarthphones in the same place? [closed]

I wonder which could be the better way to send a broadcast signal to a great number of smartphones in the same place at the same time? I'm thinking about 10.000 to 50.000 smartphones in an area of ...
0
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0answers
67 views

What happens if a FCC certified module isn't what it claims to be?

Suppose a radio module is already certified by the FCC but the manufacturer decides to ship inferior versions of it without acknowledging that fact, making users oblivious to the change. Do commercial ...
3
votes
1answer
178 views

Must FCC-certified modules be labelled with the correct FCC ID?

The manufacturer of this radio module I bought claims that it's FCC certified, but there's no FCC ID on it (though there is the FCC logo). If the final product is to be FCC tested, would it then be ...