A low-power short-range wireless protocol.

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1answer
23 views

help on making a bluetooth proximity device [on hold]

i want to make a small bluetooth proximity sensor. simply a small button like device that only serves as a bluetooth connection to my phone, and when my phone gets out of range of said device it will ...
0
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1answer
23 views

How to connect both a bluetooth receiver and a amplifier to the same power input?

Dear users of this forum, I am new to this so I apologize in advance for any rookie mistakes. I am building a portable speaker of which I connected the speakers and the amp already. I am looking for ...
0
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1answer
31 views

Which hardware to send on-off switch signal over bluetooth? [on hold]

I am looking to use a piece of hardware to get the signal from a switch or button and send the on/off signal (once the button is pressed or the switch activated) via bluetooth. The Bluetooth ...
0
votes
1answer
12 views

When an HC-05 Bluetooth module receives data via wireless does it write it to receive(rx) pin or transmit(tx) pin?

I'm using an HC-05 and I have it successfully wired up to my ATMega328P so that the HC-05 Tx is tied to the ATMega328 Rx and HC-05 Rx is tied to the ATMega328P Tx. So I'm assuming that the data ...
0
votes
1answer
25 views

FCC certification for multiple transmitters

Need help in understanding FCC certification for a IoT device with a Bluetooth module and a WiFi module. The Bluetooth has its own FCC ID, so does WiFi. Both are certified to be modular FCC ...
-1
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0answers
34 views

how to remote control LED matrix within nearby sealed environment

I want to display text on an LED matrix that is located within a sealed environment. I want to change the text by remote control, by using my iPhone. Power is available in the environment for ...
0
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0answers
43 views

Improve the time of BLE beacon scan

I have 3 Atmel MCU based BLE scanners, each uses TI CC2540 based BLE module (PDF User Manual) chip to scan for the advertise packets (bluetooth Beacons) around. There are approx. 10 Beacons at a time ...
0
votes
1answer
43 views

Switching 1 BT Module between 4 Arduino devices

I have a design for an electronics workbench that has 2 Arduino's (a Mega and an Uno), and several component testers that have Atmega328 MCU's at their core, and I was wondering if there is a way to ...
2
votes
0answers
39 views

How to select a 2.4GHz chip antenna for a space-constrained environment?

I need to use the DA14580 BLE chip for my project. The problem is for the antenna. The reference design provided for the antenna is only PCB trace that's is too big for my project: I don't know how ...
0
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0answers
25 views

How to configure CC2540 as Bluetooth HID

If anybody is familiar with the Texas Instruments BLE SOC CC2540, I'd like to know more about how to use it. Specifically, I have two options, either program the Intel 8051 MCU onboard, or an external ...
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0answers
49 views

Device to help find my buried well [migrated]

So, I am in need of something that will help me find my buried well cap. Basically I want to attach something small to the end of a steel line and then track with the phone through the ground. I've ...
1
vote
1answer
41 views

Designing a Bluetooth Keypad/Gamepad with MCU/SOC. (32 GPIO, 14/chord)

I have a Blackberry Keypad, and a custom Gamepad. I am trying to make them into bluetooth HID(s). They will be part of a single physical unit/board. I need help to get those inputs into a bluetooth ...
0
votes
2answers
71 views

HC05 Bluetooth module: gpio pins usage

I've recently bought a HC05 Bluetooth module, of which I hoped to use the general purpose input-output pins. The HC05 has loads of them, but I haven't found anywhere a single description on how to use ...
1
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0answers
48 views

HC05 Bluetooth Module - Certification - Commercial Usage

I'm interested to find out if this bluetooth module can be used in commercial products in Canada? Some of you will say "you can use whatever you want" but I'm not sure, because there's regulations ...
0
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0answers
29 views

Bluetooth Socket connection with HM-10 [migrated]

I'm using HM-10 4.0 Bluetooth module. I have written an android app. Upon starting the app it will discover nearby bluetooth devices. If it finds my HM-10 Bluetooth module then it pairs with HM-10 ...
0
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0answers
16 views

Low cost, low energy BT receiver that can be triggered by smartphone ? (no serial com req.) [closed]

Hi I am looking for a simple BT receiver device that can provide a simple digital output signal when a BT connection is made to it, and it should be low cost and low energy use if possible. Does ...
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votes
1answer
23 views

BLE-serial module barebone (just need TX/RX and AT interrupt)

I want to add to my project, a BLE module; althought I am totally confused about which one should I get. I did check most of the common chip available; and I do not get exactly if I can just use the ...
1
vote
1answer
91 views

Trying to use MUCs to sample data from IMUs over bluetooth at a specific sampling frequency

I am designing a data collecting system and I want to be able to collect the data from both sensors at a rate of 500Hz. I was wondering if anyone could help me calculate/prove this mathematically ...
0
votes
1answer
77 views

DIY 2.4 ghz antenna for Bluetooth Speaker too cut or not to cut

I just built a Bluetooth speaker using a Sure Electronics AA-AB41136 Bluetooth 4.0 Audio Receiver Board. The reception was not great since it is a PCB antenna contained in my speaker box which is made ...
0
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0answers
14 views

XBee vs Bluetooth vs CC1120 in RSSI variation measurement

I am trying to design a system using a transmitter and a receiver (both of the same protocol/physical layer of course) to detect a breach when a person passes between them. I want to achieve this ...
0
votes
1answer
86 views

Sending resistance values over bluetooth [closed]

I am diving into the deep here, as I am only familiar with audio electronics (guitar related). I thought of an educational project for myself to learn. It should be a miniature solution for the ...
0
votes
1answer
40 views

Matching speaker specifications with bluetooth audio board specifications

As the title states, I am having trouble interpreting the specifications for a Bluetooth audio board I have to determine what kinds of speakers I need, or if I need an amplifier circuit between my ...
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votes
2answers
49 views

Wireless 2.4GHz to Bluetooth? [closed]

I've been wondering about this for a while; I have a Wireless 2.4GHz keyboard that requires a USB reciever to catch the signal. How great would it be though if I could use it on my phone, for ...
0
votes
1answer
59 views

Arduino Nano + HC-05 AT not working

I have arduino nano + HC-05 bluetooth module. I have used following pins D9, D10, D11 for HC-05 KEY, TX, RX and this works for data communication without any problems. D9 pin is set to output pin ...
1
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4answers
102 views

DC motor causing noise on the power line

I've been building a circuit where I'm controlling a motor using a bluetooth module + phone. I've been having some problems, which mostly are fixed (see topic: previous topic). The main problem I'm ...
0
votes
3answers
76 views

Mosfet motor problems with bluetooth module

I'm playing around with a bluetooth module and want to control a motor using the module and a phone. I manage to control a small motor (±30 mA), but as soon as I'm connecting a bigger motor I'm ...
0
votes
1answer
47 views

Bluetooth pairing on Mac and Windows causes one to dismiss the other

My company is developing a Bluetooth-enabled robotics kit. We have found the following to be true: Pair device to computer A (a Mac) Pair device to computer B (a Windows PC) Computer A is now unable ...
0
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0answers
24 views

How to determine the limit to the number of bluetooth masters in a given area?

I am working on concept development for a sensor network and considering scale-up issues. I have found plenty of info on the number of devices a bluetooth master can connect to and I have found a few ...
0
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0answers
21 views

cc2640 OAD configuration

I'm working in my application with the CC2640. I have read that I need the CC2540 dongle usb for OAD. I have available two CC2640, is it possible to do the OAD for the CC2640 from another CC2640? or ...
0
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0answers
125 views

Difference between Raytac mdbt40 and vanilla Nordic nRF51822

Since I can get easily the nRF51822, but not the mdbt40, can someone give me a brief idea of what is the latter doing more than the former? I want to hook this chip to an arduino, to replace an HC-08 ...
3
votes
1answer
59 views

Step-up Voltage for Bluetooth Dongle to Increase Range?

Here's a bit of background to my enquiry: Recently I've had a project that involved me upgrading my laptop as much as possible, to get it to a standard where I'd have to buy a new machine if I wanted ...
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0answers
41 views
0
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1answer
65 views

Small bluetooth device (not off the shelf) which sends a single button input to a phone [closed]

What I need is some bluetooth device, that would accept a single button input and send it via blutooth to my android phone. Example commands might be - to stop playing music, forward to next track or ...
0
votes
0answers
36 views

Bluetooth Class 1 vs 2 and version 4.X

I know that bluetooth class 1 has a range of 100m vs class 2 with a range of 10m. For signal strength within 10m, is there a data-transfer or latency difference between class 1 and class 2 due to the ...
0
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0answers
41 views

simultaneously communicate with multiple bluetooth modules using arduino Uno and HC-05

I want to make a project that in which my master HC-05 module can simultaneously communicate with its entire piconet(7 slave devices all HC-05). The problem is that i cant communicate with more then ...
1
vote
1answer
56 views

More energy efficient: writing in a SD card or transmitting by BLE for long period?

I need to store about 1 adc sample per second on a wireless project for about 10 hours. The problem is the energy. What is more efficient a constant transmission on BLE or writting each second on a SD ...
1
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2answers
120 views

Missing low frequency tones from bluetooth audio output

Currently I'm working on a project which uses a bluetooth module (Bluegiga WT32i) to get audiostreams from my iphone to a 3.5mm stereo jack input for a car AUX input. The problem now is that I have ...
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votes
1answer
68 views

Is there a programmable remote vibration motor? [closed]

I am a developer and loves to develop all kind of things for me to simplify my life. Now I'm looking for the possibility to wear a tiny device that receives signals from an app of mine to vibrate when ...
0
votes
0answers
69 views

nrf51822 uart example

I've buy a nrf51822 module with a motherboard. i struggling to programming an uart over bluetooth example but i think something missing. With nrfgo studio i have erased the device and program again ...
0
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0answers
36 views

BeagleBone Black wirelessly control a Relay Board

I'm a beginner in the field of Electronics. I'm trying to make a project where Beaglebone is used to control relays to operate a lamp, based on the output from a proximity sensor. The circuit works ...
0
votes
1answer
32 views

How come nRF51822 evaluation kit isn't recommended?

Looking at the nRF51822 Evaluation Kit's page, it explicitly states that it's not recommended and is replaced by nRF51 DK. Does anyone know in what ways the nRF51 DK is an improvement over the ...
0
votes
1answer
42 views

Bluetooth device spurious emissions test

I'm reading an outline of spurious emission test for Bluetooth devices which states that The Equipment Under Test (EUT), a Bluetooth module is switched to a test nullmode in which it ...
1
vote
1answer
53 views

Microcontroller Bluetooth Multiple Connection Support

What exactly is the bottleneck that might prevent a bluetooth device from being able to pair to more than one peripheral device at a time? Is it the connection, antenna, protocol, etc? I'm planning ...
3
votes
1answer
100 views

HCI UART ? what's the difference with simple UART?

For now, I'm sending bytes from FPGA (verilog) to serial at 115200 bps. I would like to send at higher speed and connect to a bluetooth module (RN42). UART (SPP or HCI) and USB (HCI only) data ...
1
vote
1answer
67 views

Audio amplifier car board

I have a old autoradio (cassette and not AUX input ) in my car. But i don't want change because it pretty. I just want to add bluetooth. I leave fm receiver side for the true audio / radio. I want to ...
0
votes
0answers
46 views

PC Cannot Access HC-06 Bluetooth COM Port

I have an HC-06 Bluetooth module connected to an Arduino UNO board to allow for the data received by the Ultrasonic sensor to be transferred to my PC via bluetooth and serial communication. I am using ...
0
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1answer
89 views

Beacon: dBm power decrease over distance

I have beacons which advertise their configured data periodically through Bluetooth. The vendor specifies 8 different power options 0 to 7: https://support.kontakt.io/hc/en-gb/articles/201621521-...
0
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1answer
43 views

HC-06 bluetooth module working as slave device

When we say that the HC-06 is a slave bluetooth device it means that this device is connected to a Master bluetooth device. But i am a little confused regarding to the data transfer between Master and ...
1
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0answers
58 views

Bluetooth connection time

I am using a bluetooth module called HC-05 to connect to a bluetooth accelerometer (a China module called JY-901). For energy saving purposes I have to shut JY-901 down for thirty minutes and then ...
0
votes
1answer
90 views

How does bluetooth sniff mode work?

I wanted to know exactly how does bluetooth sniff mode work. Is this special mode going to affect data rates? Is it used in active transmissions or in idle mode? I am a bit confused.