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Questions tagged [bluetooth-low-energy]

Bluetooth Low Energy ("BLE") is a new radio standard, introduced in 2006. Bluetooth Low Energy is a subset of Bluetooth v4.0.

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1answer
244 views

Nordic Bluetooth 5.0 Breakout board

I am highly interested in developing a project involving bluetooth 5.0 on a nordic device, namely the NRF52840. However the package of this device is beyond my capabilities/kit for soldering. I have ...
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1answer
83 views

How add a chip antenna for the Bluetooth of the module BCM4339?

I have the following concern in a design that I am carrying out. I am working on the development of an electronic prototype that uses as a CPU the module: PICO-IMX6-SD. This module has wifi and ...
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2answers
78 views

Bluetooth programmer

Someone know if there is a way to program uC via bluetooth? I'm referring to a device that receives an hex/elf file from another BT device (smartphone or PC) and sends it to a uC (xmega in this case) ...
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4answers
142 views

Sensing a tag passes through a virtual “fence”

We have two cats who like to hide in our house. It would be great to know where they are in the house. At first I thought about setting up an indoor localization system (iBeacon, etc.) in place, but ...
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1answer
40 views

Is it possible to read/pair ESC (2.4Gz?) signal [closed]

I'm new to ESC, sorry if this is a noob question, is it possible to somehow pair or read the battery level from an ESC? What I'm looking for is to read the battery level from an ESC electric ...
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0answers
86 views

Bluetooth LE (BLE) pairing behavior

I played with a BLE device recently (VSN V.BTTN) and was able to get interesting functionality with the button and a Raspberry Pi. However, I still have a few questions regarding the device pairing ...
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1answer
426 views

RN4020 BLE module authentication without I/O Capabilities and mysterious datasheet

I'm trying to activate authentication for my RN4020 Bluetooth module in a way I dont have to enter PIN or Passcode during this process because my RN4020 wont have any displays or keyboards where to ...
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1answer
35 views

Hooking up a battery to a BLE beacon

I am looking to add a battery to this BLE beacon with as few parts as possible. In their product's datasheet they include a section on an example schematic for adding a battery (included below). My ...
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1answer
83 views

Best communication scheme for a battery-powered Bluetooth LE display?

I have a battery-powered design that I am working on using a Nordic NRF52832. The device is intended to connect to a smart phone and upon receiving a particular message from the phone, flash some LEDs ...
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0answers
39 views

Maximum Bluetooth LE devices near each other

I am planning to put 100+ Ruuvitag beacons(Bluetooth LE tranmistters) in a ~120m2 area. There will be approximately 1 meter distance between devices. I need to get their advertisements at once(each ...
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1answer
235 views

Bluetooth LE losing connection

I'm developing a device that operates with Bluetooth Low Energy (BLE). It has a connection loss problem, where it connects and stays on for a while, but most of the time it connects and then ...
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3answers
271 views

Improving battery life: BLE device with a 100uF capacitor

I have a BLE beacon and I was wondering if adding a capacitor in parallel with the coin cell battery would help with the battery life by smoothing out the peaks. The scenario shown in the chart is the ...
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1answer
502 views

Beacon testing Microchip RN4871

I got a Microchip RN4871 BLE Module and want it to act as beacon. So, I connected over UART and executed the following commands: SS,20 SC,2 NB,09,656667 Whether ...
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1answer
45 views

If two iBeacons are too close to eachother, could their signals get confused for one another?

I have a simple question that I can't find the answer to. I am testing an app with some iBeacons, and I observe that one of my iBeacons never begins to range...the region is monitored, its just not ...
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0answers
100 views

nRF51822 bricked after faulty boot loader

I have a custom board (a chinese game pad) which uses a chip named n51802, which according to nordic is a “custom” nrf51822 - completely compatible with it though. I “accidentally” (fiddling around) ...
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1answer
1k views

Flashing nordic n51802

I have a Chinese rip-off game pad, which has an n51802 which is by nordic. I want to flash my own firmware but i’m unable to find any information about it. I can put it in DFU mode, so it is flashable,...
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1answer
1k views

Passive Bluetooth Beacons [closed]

I read a white paper earlier on that implied that Passive Beacons were on the horizon (which I will accept could mean 10 years away). My head's spinning thinking about the applications of mixing ...
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1answer
801 views

Using BLE module to detect beacons nearby

I'm trying to design a BLE reader which scans and detects nearby beacons. However in many tutorials I have seen projects which uses Rasberry Pi and some BLE module it requires complex libraries. I ...
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0answers
397 views

Designing a BLE reader to detect nearby bluetooth beacons

I am new to this Bluetooth beacons and I'm trying to create a project where multiple BLE beacon readers are installed in a yard which detect the beacon modules and helps to locate the location of each ...
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1answer
79 views

Antenna effiency in bluetooth module

So i read alot of data sheets regarding bluetooth modules and when i come acorss antenna section i find that term called effeciency. What is it for ? For example If class 1 bluetooth with 100m range ...
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1answer
153 views

Primary battery dies after 5 months instead of 25

We have designed a PCB with ultra low power Bluetooth module with the objective to run it on batteries for about 2 years. We have measured the power consumption, it is 400uA on average with 20ms peaks ...
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1answer
951 views

nrf52 and Chip antenna Layout Questions

I am designing a four layer stack up PCB having nrf52832 SoC with chip antenna (2450AT18B100 Johanson Technology).It is BLE ...
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0answers
358 views

Tuning Chip Antenna

I am designing a BLE board with nrf52832. This is the first time I am designing a board having a RF part. After considering MIFA ...
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0answers
241 views

How is BLE data converted to UUID (and how can i convert it back?)

I am developing a BLE Android application that can receive small messages from a beacon. As a test I am letting the beacon increment a counter and send this as a string (service_data=str(counter)). I ...
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1answer
187 views

Can Bluetooth Low Energy Beacons act as receivers?

I am working on a project which involves sending data from many BLE beacons to many other BLE beacons. To be more specific, I have two groups of beacons: The first group consists of senders (or ...
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2answers
209 views

Indoor positioning system using bluetooth low energy

Does using wireless MCU is better or using a stand alone MCU connected with BLE module is better in terms of power transmitted by the Bluetooth? Second question is there a way to make rssi value ...
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3answers
436 views

Going ultra low power with a reflective optical sensor

I'm using an nrf52 and an OPR5005 reflective optical sensor which takes roughly 20mA. In the design I have only 30mmx30mm space, so only suitable battery is cr2032 or cr2477 so far. The question is ...
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1answer
122 views

BLE registration

A question more on the legal side of electrical engineering: We have designed and implemented an embedded sytem with a micro controller controlling a bluetooth module. The BT module has its own ...
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2answers
1k views

Use HM-10 (Bluetooth LE) or ESP8266 for telemetry [closed]

I am in the process of building a quadcopter, and I would like to send the telemetry from the device to my laptop wirelessly (wires are very inconvenient for debugging!). I have several HM-10 BLE ...
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3answers
103 views

How can I measure low power energy usage of bluetooth device?

I need to measure the energy usage of a small bluetooth device which is normally operated by a coin cell 3v battery. Background: Using an oscilloscope I was able to get fairly good pictures of the ...
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2answers
188 views

Identify object that pass through a hole?

We have small bags in 2 different colors that pass through a hole of about 40cm. The bags can be dropped and so they pass very fast. We have to know which kind passed through the hole. I was looking ...
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2answers
3k views

Send custom GATT characteristics using HM-10 (actually a CC2541)

Short question - how do I send data as GATT characteristics from a peripheral BLE device (Android UNO + HM-10) to a central device (i.e. an android smartphone?) I'm working on a BLE peripheral as a ...
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2answers
270 views

Can I solder any module onto a PCB? [closed]

I was wondering if I'd be able to solder complete modules onto a PCB... E.g. BLE module, GPS module, Accelero/Baro modules, etc. If not, what components can I use to get these features?
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1answer
188 views

BLE beacons Flag

I have some BLE beacon modules and I want to make an indoor positioning system with them. There is a problem with my beacons that they are not always discoverable (when scanning with an Android app) ...
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0answers
417 views

nRF52832, using a chip antenna for short range purposes

In the past I have used nRF51822 to make small low powered devices for projects. I have used allready made modules from china (WT51822-S2) and programmed them using mBed. It was really easy but not ...
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2answers
158 views

BTLE synchronize advertising beacons with phone scanning

In a BTLE master/slave connection, the master and slave devices synchronize their frequency hopping. Along with the connection parameters (like interval, slave latency, supervision timeout) this ...
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3answers
1k views

Reduce BT power consumption by dis- and reconnecting

This is a question which comes from a programmers perspective (so might be SO, please migrate then) but with an EE background. I am trying to programmatically reduce the bluetooth power consumption ...
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2answers
129 views

How to use a reference design in datasheet?

I'm trying to gain a better understanding on what this is and how to use it. I know this is a datasheet for SAMB11 SoC, more specifically the reference design on page 50 is what I'm inquiring about. ...
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1answer
145 views

How to understand data from Bluetooth LE accelerometer with X,Y,Z as single value? [closed]

I'm using a cheap BLE accelerometer MPU 6050 that notifies X, Y, Z values as a single attribute. It seems that this type of value hasn't been standardized and I don't know how to read data correctly. ...
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3answers
269 views

Use BLE instead of RFID for race timing system

I've never studied electrical engineering, although lately I'm been increasingly curious about race timing systems. According to the research done so far, usually they use RFID systems to monitor when ...
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1answer
3k views

Is it possible to calculate the Time of Flight between two Bluetooth devices?

I want to calculate the distance between 2 Bluetooth tags (still need to be developed so no restrictions in components). The tags will not be time synced so we would like to calculate time of flight ...
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2answers
298 views

Why does increasing the modulation index of GFSK reduces peak power, increases the range & robustness of a bluetooth connection?

I was going through a Bluetooth LE tutorial in which it was mentioned that by increasing the modulation index of GFSK scheme, the peak power was reduced & range & robustness was enhanced over ...
2
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1answer
608 views

Power Consumption for BLE advertisements

I have a set of voltage readings that are read at a high rate and they have produced voltage data for power consumption while: advertising events, for connection events, and for no activity. I've ...
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1answer
586 views

Why does Bluetooth Low Energy use 3 advertising channels?

Why are there three advertising channels (rather than two or four, etc)?
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1answer
53 views

What thing should be consider while choosing BLE uC [closed]

I'm newbie in BLE segment need micro-controller with bluetooth (SOC). Please help me what thing should be consider while choosing SOC.
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1answer
76 views

How to read the Bluetooth Tracker to fetch the data about its coordinates? [closed]

I am working on App Concept which is similar to any Bluetooth device which works as Tracking. I need to use the Bluetooth and collect its location coordinates on every 5 mins. How to read the ...
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1answer
425 views

Calculate battery consumption in IoT Device, Parameters and Considerations Regarding Bluetooth

I've designed a basic IoT architecture to measure biosignals. I am not an expert in the field so I have doubts in basic battery consumption calculation and considerations. The proposed system ...
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1answer
348 views

Teensy 3.2 receives garbage values from HM-11 BLE module

Recently purchased an Hm-11 BLE module, and connected it to a Teensy 3.2. I can see the BLE module (AnyFlite) on my phone using the MSMBle app. The following code was used to initialize it: ...
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1answer
605 views

Can BLE transactions be encrypted without pairing?

The way I understand BLE specs is that the only way the communication between 2 BLE device to be encrypted is that they need to be paired. Is that right?
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1answer
2k views

Difference between RFCOMM and L2CAP Protocol in Bluetooth Communication

I just started learning the essentials of Bluetooth Programming since it is heavily used in my project. I have an nRF52 Development Board and a Raspberry Pi 3 - Model B (with built-in bluetooth). I ...