# 5,976 questions

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## Maximum power consumption

Hi, were are looking forward to redesign our PCB. The nRF51822 will communicate via I2C which sinks up to 3 mA and 15 IOs will source the maximum rate of 15mA. Additional to this, the Bluetooth will consume power.

I ... (more)

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## Maximum power consumption

Hi, were are looking forward to redesign our PCB. The nRF51822 will communicate via I2C which sinks up to 3 mA and 15 IOs will source the maximum rate of 15mA. Additional to this, the Bluetooth will consume power.

I ... (more)

19
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## how to write a functions(program) for transmitting and receiving data over uart using nrf 51822?

Hi, there i am using nrf51822 to communicate with quectel ec25 .i want to send AT commands over uart and receive some response from quectel.for eg. i am sending a "AT" command i should get "ok" response in return ... (more)

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## J-Link does not connect to nrf51822

I want to reprogram a nRF51822 xxAC device on a existing product. I have a J-Link (SEGGER) device with latest firmware. I'm running the SEGGER J-Flash V6.20e utility. I have connected the DIO and CLK lines to the ... (more)

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## Is there a mesh gateway project in mesh SDK?

I got the BLE mesh SDK from: http://www.nordicsemi.com/eng/Products/Bluetooth-low-energy/nRF5-SDK-for-Mesh/(language)/eng-GB

I want to develop a mesh gateway to connect the internet. Is there a example gateway project for mesh?

Thanks.

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## Performing DFU with nRF Connect v1.8 Fails to Switch from App to Bootloader - Worked on 1.7.5

Since upgrading to nRF Connect on my IOS device the DFU won't reconnect to the BLE in the boot-loader after initiation from the application.

The device will migrate to the boot-loader and begin advertising but nRF connect doesn't ... (more)

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## nrf52822 iot mqtt implmention??

Hi,

We are able to interface nrf52822 with wiznet5500i.But We need help or how we will process further for mqtt AWS iot stack..

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## How can I get rssi before I make a connection?

Hello ,

case BLE_GAP_EVT_CONNECTED:
APPL_LOG("Connected to target\r\n");
err_code = bsp_indication_set(BSP_INDICATE_CONNECTED);
APP_ERROR_CHECK(err_code);

m_ble_nus_c.conn_handle = p_ble_evt->evt.gap_evt.conn_handle;

// start discovery of services. The NUS Client waits for ...
(more)

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## can not disable Rx or TX

i need to disable RX when data was transmit and enable RX again when data transmit complete. i tried :

NRF_UART0->TASKS_STOPRX = 1;


( i use SDK11 pca10028) but nothing happend,i still ... (more)

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## iot stack compile for nrf52822

Hi,

I get following error when i try to compile nRF5_IoT_SDK_v0.9.x for target nrf52822

compiling x509_csr.c... assembling arm_startup_nrf51.s... <command line>(13): error: A1517E: Unexpected operator equal to or equivalent to < compiling x509_crt.c... compiling system_nrf51.c ... (more)

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## nrf51822: Is it possible to wake up chip from systems off mode using the built in WDT and an extern crystal

I am using an Nrf51822 for a project. I looked in the datasheet and it said that there is a built in WDT for the chip. It also says that clocks can't be used while in systems off mode ... (more)

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## First time with beacons.. need some help ;)

Hello! Just got a few NRF51822's.. looking to just brodcast a few basic URL's.. if someone can point me in the right direction or maybe let me know where I can hire someone to walk me through the ... (more)

39
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1
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## softdevice taking more RAM on SDK 12

Hi,

1) In the newer versions of NRF 5 SDK (sdk10 vs sdk12), does the softdevice takes more RAM? I am using nrf51822 (qfaa) and sdk 12.3. with softdevice s130_2.0.0.1. I want to use 1 peripheral ... (more)

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Hi,

I used command:

nrfutil pkg generate --softdevice s130_nrf51_2.0.1_softdevice.hex --hw-version 51 --key-file private.pem sd130v2.0.1_update.zip


to generate package for only softdevice update (nrfutil version 3.3.2). Next I used nRF Connect to update ... (more)

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## Using Diode With 4.2V LiPo?

I'm using the NRF51822 for a project that will be powered by a lithium battery. I'm wondering if it would be safe to use a diode (such at this one) to drop the 4.2V LiPo maximum down ... (more)

28
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## uart recive byte comming uart RX

i'm new in BLE, now i have project with nrf51822 and sdk 11.0. in chip arm like STM, MPS or PIC, avr. when byte come, we have a flag set 1 to notice that there is one byte ... (more)

37
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## nRF51822 Beacon PCB Stackup (2-Layer) Required

Hi, We are designed our own Beacon PCB based on nRF51822 Beacon Kit...We followed board size,PCB Antenna Trace width and GND Clearance as per Beacon kit...The difference is NRF51 Package we followed QFN instead of BGA...

We ... (more)

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## how to define gpio pins and generate pwm on gpio pins?

Hi There, i am new to nrf51822 and new to program this kind of controller.I searched over the website, I couldn't find a good introductory documentation for programming the nrf51822, specifically the nrf51-dk. i have two problems 1 ... (more)

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## How does writing to SPI1->TXD affect SPIS transaction on nRF51822

I have a strange bug, that I do not have any good answer for.

In the software, I use either SPI1 or SPIS depending on current configuration, I have seen some rare cases where I see unexplained 0 values on ... (more)

40
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## BLE_app_uart issues

main.cble_uart.hex Hello,

I use nRF5_SDK_11.0.0_89a8197 and s130_nrf51_2.0.0_softdevice configuration to test the ble_uart program.

i use nrfgo Studio to load the soft device and application in custom ble hardware.

I use nRF51822_xxAB ble chip ... (more)

18
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## How to turn on Leds only for advertising time?

Hi, i am using SDK v8.0 and in main function, initialization like this err_code = bsp_init(BSP_INIT_LED | BSP_INIT_BUTTONS, APP_TIMER_TICKS(100, APP_TIMER_PRESCALER), button_event_handler);  and

in advertising_start function, calling function is err_code = bsp_indication_set(BSP_INDICATION_ADVERTISING); this is working. but i want like this ... (more)

33
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## how to get data ADXL345 using nRF51822 via arduino IDE and mbed compiler

but that program can't get ADXL345 data, just UART nRF51. I've tried using nrf51822 too ... (more)

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## Where can i find nrf51822 firmware?

Anyone know how to put the nrf51822 firmware again? I made an update and deleted it from the kit. Where can I find it?

Thanks

1k
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Hello , I want to establish a connection between the adxl345 nrf51822. Nrf51822 is working both individually and Adxl345. I would be glad if I can provide you with necessrat.adxl345 to check the bluetooth connection.

55
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## Timed interrupt

Hello everyone,

I am unexperienced in coding that is why I am asking for your help and oppinions on creating timed interrupt. I am using nrf51822, s110. My goal is to send microcontroler to sleep while disabling all peripherals and ... (more)

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## how to interface tcrt1000 optical sensor with nrf51822?

Hi ,there i have tcrt1000 optical sensor wants to interface with nrf51822 so can anybody provide me the tutorial on this things with a code... cheers, Abhijeet

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## Has anyone used nf51 bluetooth with some app mobile?

Has anyone ever used nf51 bluetooth with the app inventor?

I have values ​​coming out of the microcontroller terminal. I want to send them to a mobile application using the app inventor.

But I do not know how to do ... (more)

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Using SD130 v2.0.1 on nRF51822, I would like to be able to change the advertisment interval after first connection.

My app is based on the HRS sample, with a modified avertising_init:

static void advertising_init_interval(uint32_t advertInterval)
{

static bool ...
(more)

77
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## A way to validate the hex file burned into device against the result (hex) of original source code

Engineerings, We are looking around to find a way to prove that the hex file burned into the device is really the result of the original source code. Is there any idea/way to validate?

How Nrfgo verify the program ... (more)

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## What is the bandwidth of nRF51 Series SoC?

Im currently using NRF21l01 (32 byte) however I need more bandwidth any suggestions?

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• Resolved questions: 10659
• Total questions: 26081

## Recent blog posts

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Posted 2017-09-18 11:58:04 by schef

## Recent questions

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• ### Maximum power consumption

Posted 2017-10-17 18:15:05 by Ruediger
• ### Advertising restart after a disconnect event

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