# 5,677 questions

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Hi Nordic and fellow developers, I have been working on upgrading the nRF51822 QFAA s110 and upgrading the soft device to work as s130 for its (simultaneous Central/Peripheral/Broadcaster/Observer) advantages. The client wants the s130 for a project ... (more)

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## How can I send a signal from one pin to another pin?

Hello! I am receiving a signal from a RC charging circuit in an input pin and I would like to output this signal to another pin. So that I can see the delay between the received signal and the original ... (more)

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Hello!

I'm trying to read data off of a commercial blood pressure monitor (Qardio arm) using an nrf51822 with the nrf51 SDK v10.0.0 as the central role (s120). I am able to connect using sd_ble_gap_connect() and run ... (more)

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## Central can't properly encrypt to mode 1 lvl 3, pairing not supported

Hello!

I'm trying to read data off of a commercial blood pressure monitor (Qardio arm) using an nrf51822 with the nrf51 SDK v10.0.0 as the central role (s120). I am able to connect using sd_ble_gap_connect(), and when ... (more)

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## twi, mpu650 + hmc5883l

HI, i m beginner in TWI with nrf52832. i want to write a bit in a registre of hmc5883l but i didnt succeed. what i want to do is :

tgis my own code ... (more)

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## nRF51822 Electrical Specs for SWDCLK and SWDIO/nRESET

What are the electrical specifications for the nRF51822 SWDCLK and SWDIO/nRESET pins? It it the same as the GPIO electrical specifications?

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## BLE SIG Certification, Reference design to be used to obtain EPL

Hi, does anyone know if there is a document in which is explained, by Nordic, how to obtain a bluetooth certification using nRF51822 and S110 Stack ?

I know if a reference design is strictly followed the customer do not need ... (more)

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## Add Buttonless DFU service to my Application Code

Hello,

I need to add firmware update process via air to my NRF 51822 device that runs application code on stack 12.2. How can i achieve this?

1) Do i need to add buttonless DFU library (from Experimental_Buttonless_DFU example ... (more)

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## Maximum number of elements under advertise

Hello,

I want to develop small modules with smart BLE that only sends advertise every 2seconds.

Do you think that the Central module can see all peripherals if the installation is composed by 100 modules sending advertise?

Thanks! Xavier

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I am doing some custom work, and have discovered an odd bug, that I can not seem to figure out.

On the tx radio, I am transmitting a BLE ADV packet with the first 3 bytes 0x4225BB. On the receiving ... (more)

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## timer timeout issues

I'm using an NRF51822 with soft device s110 version 7.1.0 and I'm having timer-related issues.

I create 1 periodic timer and 6 non-periodic (single shot) timers with app_timer_create. The periodic timer handler starts the other timers ... (more)

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## how to connect bluetooth of nrf51822 with my android phone if i am not using nordic master control pannel

i want to connect the bluetooth of device (nrf51822) to my android phones bluetooth without using master control pannel.i want general bluetooth connection. can you please tell me how can i modify my code for changing id or key ... (more)

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## Serial port only works when debugging

Custom app running on a nRF52 devboard. Serial port runs when I use the debugger and continues after I exit the debugger, but does not run from a cold start.

using the Nordic UART FIFO code. NRF_LOG_USES_UART=1 and DEBUG ... (more)

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## MPU6050 Init failed when integrated with PCA 10028 (nrf51822)

Hi..! I am trying to *Receive ACCELEROMETER DATA FROM MPU6050 to PCA10028(NRF51822) AND WANTING TO PRINT IT ONTO UART using KEIL IDE. Code is getting compiled & getting Output on UART as:-

mpu6050 test

mpu6050 init fail

mpu6050 id is ... (more)

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## Advertising with device_name Vs whitelisting

I am confused with whitelisting and advertising/scanning with device name

I have a peripheral and a central device, peripheral device is advertising with device name set as 'PERIPHERAL_DEVICE' and my central device is scanning for the name 'PERIPHERAL_DEVICE' (m_target_periph_name ... (more)

27
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## How to return BLE peripheral's connection status

I'm writing an Android application that connects to various BLE peripherals including the NRF51 and NRF52. I don't know if this question is appropriate for this site, but here it goes.

I noticed that the method onConnectionStateChange() from ... (more)

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## nRF bcast mesh, which softdevice for nRF51822

Hello,

i'm currently trying to implement the bcast mesh into an existing application (sdk v6.x.x + S110 7.1.0). The github readme states that the bcast-mesh is working fine with SDK8.1.0+S110 and SDK12.0 ... (more)

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## NRF51822 to NRF51822 Over the air update (DFU)

Hi

am working on a project and I need to have one NRF51 chip update another NRF51 chip, how can I go about this?

thank you

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## Can I use MDBT40 with ATMEGA328 ?

I have seen exaples using the Raytec MDBT 40 with ATMEGA32U4 infact adafruit has its own board with ATmega32u4 and MDBT 40.

Can I use MDBT 40 with ATMEGA328 ?

537
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## Programmer for NRF51822

Hello,

I just purchased this device: https://www.aliexpress.com/item/J34-F...

but found out that evaluation board is only a debugger and does not actually program the board.

Before I buy, I just wanted to make sure that the ... (more)

37
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1
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## nRF51_SDK_7.1.0

where can I find this?

20
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## Clarify is_conn_params_ok() function

While investigating connection parameter handling, I noticed the following:

The is_conn_params_ok(ble_gap_conn_params_t * p_conn_params) function in ble_comm_params.c only compares the interval, not the slave latency or connection supervisory timeout. This has the effect of the peripheral accepting connection parameters with ... (more)

55
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## use whitelist in Central(SDK12)

I want to use whitelist in Central (nrf51822,SDK12),but I don't know which function to add the MAC address. These three functions：

peer_list_get(pm_peer_id_t * p_peers, uint32_t * p_size);
scan_start_with_whitelist(void);


If there are examples of this, better for me，thanks.

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## Programming OTA for the first time

Hi,

I am working with a nRF51822 board and I want to program in OTA. I know how to program over the air, but the only problem is that when I have a new unused board I need to precharge ... (more)

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## Does the BLE stack resend a packet if response is not received?

Hi, I was wondering If I need to wait for a response from the server that a command was executed before executing another command or if the BLE stack takes care of this under the hood so to speak.

For ... (more)

19
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1
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## Enabling DC/DC mode on the NRF BEACON

Hi Nordic,

I am trying to enable the DC/DC converter on a PCA20006 rev 1.3.0. I am using the softDevice S130.

1. Using the sd_power_dcdc_mode_set(NRF_POWER_DCDC_ENABLE) function.

I tried to activate the DC/DC converter using the ... (more)

40
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## Tutorial Characteristic Master example

Hi, I'm trying to notify the temperature value with Tutorial Characteristic Master example. But log shows me this rows when I try to read the Descriptor Client Characteristic Configuration:

(more)

26
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1
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1

## Is it possible to use pstorage after initializing it with the SD disabled? [closed]

For what I understand of the doc and this question it is possible to turn off the SD, turn it on later and then use the settings as normal.

Is it possible to turn on the SD, initialize pstorage, turn ... (more)

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## one wire library for nrf51822 keil

one wire library for nrf51822 keil for connected ds18b20 . tnx

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## one wire library for nrf51822 keil [closed]

one wire library for nrf51822 keil for connected ds18b20 .

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• Total questions: 23161

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## Recent questions

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