# 24,458 questions

47k
views
294
3

## How to minimize current consumption for BLE application on nRF51822 [closed]

How to minimize current consumption for BLE application on nRF51822

2k
views
60
23

## Tutorials[Meta]

Hi,

We're working on making some more tutorials, we have some thoughts on what we want to do, but we would really like your input. After all it's you, the user, who will benefit from this material.

What ... (more)

29k
views
52
2

## What is a client and server in BLE?

When working with BLE, one sees a lot of different names for roles, which is confusing. What is actually the difference between them all, master, slave, central, peripheral, client, server and so on?

37k
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51
7

## How do I calculate throughput for a BLE link?

How can I calculate the maximum throughput for an application running on the nRF51822 and the S110, when connecting to different kind of Central devices?

4k
views
49
1

## On SDK 12.0.0, SDK 12.1.0 and SDK 12.2.0 only

Please Do not judge the quality of SDK based on number of entries here. This thread should be considered as part of Nordic effort to ... (more)

4k
views
48
2

## CC2541 versus nRF51822

Gentlemen,

I apologize if this is not the correct place to post this question.

I have a potential project to start a BLE project but their requirement would be start a new design with the CC2541.

However, I would like ... (more)

43k
views
47
2

## What is connection parameters?

What are the connection parameters for a Bluetooth low energy link, and how do they affect performance?

17k
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44
2

## What low-frequency clock sources can I use?

When initializing the S110 softdevice, I can choose between the different clock sources as defined by the nrf_clock_lfclksrc_t enum:

/**@brief Possible lfclk oscillator sources. */
enum NRF_CLOCK_LFCLKSRCS
{
NRF_CLOCK_LFCLKSRC_SYNTH_250_PPM,                       /**< LFCLK Synthesized from HFCLK.                    */
NRF_CLOCK_LFCLKSRC_XTAL_500_PPM,                        /**< LFCLK crystal oscillator 500 PPM accuracy.       */
NRF_CLOCK_LFCLKSRC_XTAL_250_PPM,                        /**< LFCLK ...
(more)

3k
views
40
2

## what are SDK 11.0.0 known issues

On SDK 11.0.0 only (NOT the alpha release)

• Do not judge the quality of SDK based on number of entries here. This thread should be considered part of Nordic effort to main the quality of the release.

GENERAL ... (more)

8k
views
39
6

## How to measure Lithium battery voltage [closed]

How to measure Lithium battery voltage with the nRF51 ADC

11k
views
38
9

## nRF51822 over the air bootloader with gcc

For my current project, I need to compile the »over the air bootloader« with gcc (because our buildserver runs on linux, developers using Mac … no Windows and no Keil so far).

But unfortunaly, the bootloader example from the sdk (5 ... (more)

21k
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36
9

## dealing large data packet's through ble [closed]

Hi, I need to send(using BLE) large amount of data's, which are collected by the accelerometer sensor for 1 hour. I have an external NOR flash where the accelerometer data's are stored and from there data's ... (more)

15k
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35
6

## What is the power and clock model of peripheral in NRF51? [closed]

Hello,

I was puzzled by RM.

I notice POWER control register in peripheral(UART,SPI,TWI) module.

1. Will UART be powered when system power ...
(more)

22k
views
32
11

## License for KEIL MDK is EXPENSIVE. Any way around??

I am starting my development work with Nordic Semiconductor nRF51822 Device and already purchased the Development kit. What i wanted to ask is do i need to purchase KEIL MDK 500 License to write my code/application? Because the Low ... (more)

287
views
32
2

## Can i play audio from storage wirelessly on speaker using nrf51422 and on nrf52840?

I want to play songs wirelessly on speaker ,suppose speaker is connected to one soc and and another soc is connected to storage which contains songs how do transfer that from storage to speaker and play wirelessly and please tell ... (more)

14k
views
29
4

## How do I create my own service on the BLE stack? [closed]

I've sifted through the examples given to me, and none of them seem to explain how to create your own service and add it to the stack. All of the services that are registered in the ble examples (nRF51 ... (more)

5k
views
27
1

## My device is freezing and restarting

My device is either freezing or restarting, and i do not know why.

6k
views
26
2

## Best way to implement system clock on nRF51

Hi everybody,

a while ago I used the approach proposed here https://devzone.nordicsemi.com/questi... to keep the date and time on a NRF51822 device while using Softdevice S110 and the Timeslot advertiser-scanner (https://github.com/NordicSemiconducto...).

In practice ... (more)

200
views
26
1

## nRF51: IoT-MQTT Publisher Example problems

Hi, I just read IoT-MQTT example and have almost exactly the same problem but with the Publisher. I am running a PI with Raspberian 4.4.34-v7+. I have installed mosquitto on the PI and have radvd installed. I turned ... (more)

48k
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25
1

What can I do about it?

14k
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25
2

## What does CCCD mean?

Dear Nordic Developer Zone,

I have a silly question. After searching in the Nordic and Bluetooth documentation, I didn't find what CCCD and SCCD mean. Theses metadata are parts of the characteristics.

Can you explain me what these acronyms ... (more)

9k
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24
1

## nRFgo Studio cannot load JLinkARM.dll, re-installing does not help. What went wrong?

After installing nRFgo Studio v1.17.1 on Windows 7 64 Bit (using the administrator account), I get an error message in the Log section just when I start the program:

5k
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23
13

Hello. I want to make flashing of devices for production faster. So I want to write application together with bootloader via J-Link simultaneously and not via OTA DFU. I'm using S110 v6 and dual bank BLE DFU from SDK ... (more)

8k
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22
10

## BLE Sniffer recommendation [closed]

Hello, I use nRF51822 for my project and I would like to purchase some BLE packet sniffer. Does anyone recommend any sniffer? My purpose for that is debugging and check transaction, so it will be good that it has a ... (more)

12k
views
22
3

## How to get 6 byte mac address at nrf51822

When I scan BLE device at nRF UARTv2.0 App in Android4.4, it is appar device name(Ex:Nordic_UART) and 6 byte device address(MAC address?). I want to include mac address in device name. How to get 6 ... (more)

9k
views
21
5

## How do you put the nrf51822 chip to sleep? [closed]

I am wondering how you put the nrf51822 chip to sleep. I've determined that the way to do this with the soft device is sd_app_event_wait() in the while loop. What about non-softdevice?

I am wanting to have it sleep ... (more)

8k
views
21
1

Hi,

and what is the difference?

Code :

1k
views
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6

## PWM Duty Cycle update best practices

Because of the limitation in the GPIOTE hardware that only one channel can be connected per GPIO, care must be taken when changing a PWM duty cycle. If for instance the compare events that each trigger a GPIOTE toggle happen ... (more)

6k
views
21
2

## Update connection parameter programmatically [closed]

Hi

I want to update the connection parameter and send this request from nrf51822 to a smartphone app. I see there is a function ble_conn_params_change_conn_params() for this. However, every time I call this function, nrf51822 disconnects the current connection and ... (more)

2k
views
21
1

## nRF51822/nRF51422 getting started and documentation overview

What is the best place to get started with nRF51 and BLE development?

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