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Last activity 2017-12-07 12:21:49 +0200 by Martin Børs-Lind flag of Norway

How to trigger ADC from a timer interrupt, while generating PWM with the same timer and while using BLE on nRF51822?

Hi. I am a newbie in Nordic chips, quite knowledgeable in Atmel AVR, though. I'm working with an nRF51822 on a board like this https://www.waveshare.com/wiki/BLE400. I use the Mbed environment.

What I'm trying ... (more)

73
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2
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2
answers
Last activity 2017-12-06 02:20:30 +0200 by mantap

how to convert 2's complement ADXL345 data to nRF51 UART? needed help

finally I have done to implement that ADXL345 can throw data over BLE using nRF UART app service with this code. now my problem is how to change 2's complement ADXL345 data to array of string/character.

here it ... (more)

85
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1
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1
answer
Last activity 2017-12-03 14:12:05 +0200 by mantap

How Receive ble_uartservice using pc serial console, but can't loopback ADXL345 data using nRF51 UART.needed help

This is my coding implementation using mbed online compiler mbed code and this is serial pc result

image description

and this is the result over BLE using nRF UART app image description

how this program using serial pc console not synchronize with ADXL345 i2c ... (more)

83
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1
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1
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Last activity 2017-11-25 14:28:47 +0200 by mantap

how to use nRF51822 SDK for building connection between nRF51822 & ADXL345

I wanna build project nRF51822 using ADXL345 for accelerometer sensor that program using eclipse or keil. can you teach me how to build using nRF51822 SDK version 6 or higher... please teach me from beginning. I am newbie for this ... (more)

48
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1
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Last activity 2017-11-23 14:20:13 +0200 by Martin Børs-Lind flag of Norway

NRF52840 battery life estimation mathematical formula

Hi,

I want to know about mathematical formula to find / estimate the battery life of Bluetooth beacon containing NRF8240. If chip is transmitting at +8 dBm and have 1000 ms of broadcast interval.

296
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1
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Last activity 2017-11-21 15:03:51 +0200 by Bjørn Kvaale

Best practice for monitoring coin cell battery voltage given ESR

I'm using an NRF51 w/ S130 operated directly from a coin cell battery. I use the ADC with a voltage divider to successfully measure analog voltages. One of the challenges of the coin cell is that its ESR is ... (more)

39
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1
answer
Last activity 2017-11-14 10:36:18 +0100 by fares elec

Undefined symbol nrf_drv_adc_sample_convert

I am getting following errors when compiling source code in Keil-5. Any one suggest me what i am missing to define symbol?

linking... ._build\nrf51422_xxac.axf: Error: L6218E: Undefined symbol nrf_drv_adc_sample_convert (referred from main.o). Not enough information to list image symbols.

107
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Last activity 2017-11-13 22:09:35 +0200 by bryanhsieh

SD Write Problem

Hi Everyone,

I am trying to record data from ADC to a SD card every 500ms using nrf52832. I am following the fatfs example. Before I had a problem whereby every approximately 10s I would lose a few samples from ... (more)

65
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1
answer
Last activity 2017-11-06 17:27:44 +0100 by AmbystomaLabs flag of United States

NRF52832 physical pin analogRead

Hello,

I'm trying to read an ADC value from a sensor(for POC I'll be using a pot wired to 3.3V VDD and GND) but all the examples I found only demonstrated reading the internal VDD with ... (more)

126
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1
answer
Last activity 2017-11-06 11:18:06 +0200 by Jørgen Holmefjord flag of Norway

nrf52832 sensor ADC read example questions.

Hi,

I'm quite a beginner to this whole nrf52832 world and I'm trying to read some data from a flex sensor wired in series with another resistor connected to VCC now I understand the whole ADC init thing ... (more)

75
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1
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1
answer
Last activity 2017-11-06 08:09:57 +0200 by Bjørn Kvaale

Sample Time vs Accuracy on the SAADC (nRF52832)

Does increasing the sample time on the SAADC increase the accuracy of a single shot measurement on the SAADC? I couldn't find anything in the datasheet regarding accuracy vs sample time. I did see the information regarding the sample ... (more)

46
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Last activity 2017-10-30 19:09:15 +0200 by B

Why is the function "gpiote_init()" conflicting with the bluetooth code?

Hello, I tried to add the code of the bluetooth tutorial called "Bluetooth low energy Characteristics, a beginner's tutorial", with a code that measures the delay of two forms of waves, but when debuging them together there is a ... (more)

42
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2
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1
answer
Last activity 2017-10-21 17:10:55 +0200 by John Silver flag of Belarus

How can I change the SoftDevice version? [closed]

The "Bluetooth Low Energy Characteristics" tutorial, a beginner's tutorial, https://devzone.nordicsemi.com/tutori..., uses a version 11 of SoftDevice. But I need a it in version 12.3, how can I do this?

B.

135
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1
answer
Last activity 2017-10-16 17:03:10 +0200 by Jørgen Holmefjord flag of Norway

Low Power SAADC

Hi everyone,

I am having problems in getting the low power mode in SAADC to work. If I enable it in the config file then the ADC doesn't run anymore.( Blank in the RTT viewer) I have four channels ... (more)

108
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no
votes
1
answer
Last activity 2017-10-12 10:44:12 +0200 by Sigurd flag of Norway

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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-1
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1
answer
Last activity 2017-10-10 11:04:56 +0200 by Jørn flag of Norway

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

1k
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1
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Last activity 2017-09-28 08:53:54 +0200 by Jørgen Holmefjord flag of Norway

which pins of nRF52832 can support PWM and how many pins can support.

i need to connect 8 DC motors to it,using PWM channel.It is possible to connect with it

275
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2
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2
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Last activity 2017-09-27 16:59:21 +0200 by endnode

what are the documents require to start programming with nRF52

examples are given but how can we apply them as per our requirement

56
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Last activity 2017-09-26 20:52:47 +0200 by Vishb

How i use battery service level measurement?

Hello,

I am using NRF52832 boars s132 and sdk is 13.1. I have developed my application is read analog accelerometer valie and send to mobile apps. Now i want to also battery indicator in my android apps. So how ... (more)

51
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no
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1
answer
Last activity 2017-09-26 01:34:25 +0100 by Nguyen Hoan Hoang flag of Canada

Large amounts of data over UART

I'm trying to sample the 4 of the analog inputs on the nrf51822 at upwards of 10kHz and get the data out some how. Currently I'm using printf statements but that starts to break down around 500Hz.

Does ... (more)

56
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1
vote
1
answer
Last activity 2017-09-19 02:37:41 +0200 by RK flag of Singapore

New to NRF51422

I am developing a product where I need to read a signal from an SPI ADC and send remotely to a receiver. This will be powered of a coin cell. I see that the NRF51422 is low power, but I ... (more)

57
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1
vote
1
answer
Last activity 2017-09-08 11:36:26 +0100 by Jørgen Holmefjord flag of Norway

When does the event NRF_DRV_ADC_EVT_SAMPLE occur

Hi there, I was trying out the ADC example which is sampling 10 times the ADC and then generating the event NRF_DRV_ADC_EVT_DONE to process the data. I extended the handler function to also react to event NRF_DRV_ADC_EVT_SAMPLE. But this does ... (more)

144
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1
answer
Last activity 2017-09-06 16:05:48 +0200 by Petter Myhre flag of Norway

Concurrent connection on NRF52840

How many concurrent connections can be made with NRF52840 at one time? How many broadcast connection or message it can receives at one time ?

281
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1
answer
Last activity 2017-09-06 13:49:43 +0200 by Joakim Jakobsen flag of Norway

PWM channel

What is PWM channel and what does it indicates?

What is advantage to have more PWM channels ?

35
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Last activity 2017-09-05 18:21:40 +0200 by harlek

NRF51822 got odd behavior when calling app_timer_start before mainloop

Hi,

  • I am using SDK 12.02 with softdevice 130 and having a odd issue here.

  • In my application, I want to advertise ADC value via beacon and to report the ADC value via serial. In this design, I intend ...

(more)

104
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no
votes
1
answer
Last activity 2017-09-05 15:06:44 +0200 by Joakim Jakobsen flag of Norway

PCB reference design for NRF52840

I need PCB reference designs for NRF52840. Please could you guide me about it ?

444
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no
votes
1
answer
Last activity 2017-09-05 12:49:36 +0200 by Joakim Jakobsen flag of Norway

NRF52832, NRF52840 and NRF52810 comparison

Please check the file attached in the attachment section. I am trying to compare NRF52 series chip. Please correct me if I am wrong and please add the missing values of NRF52810 chip.

This table will be good help for ... (more)

182
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1
vote
1
answer
Last activity 2017-09-05 09:22:52 +0200 by Jørgen Holmefjord flag of Norway

Using ADC with Sleep Mode

I'm relatively new to development on the nRF52832 and I'm trying to find information on how to use the sleep mode with the SAADC.

Goal: The micro should be in sleep mode until an event is triggered - this ... (more)

202
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no
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1
answer
Last activity 2017-09-04 16:52:30 +0200 by AmbystomaLabs flag of United States

Antenna for NRF52

Hi,

I want to know what kind of antenna nordic recommend to use with NRF52 chips.

Please could you guide us about it. We are interested in some sort of table where we can check and compare the antenna sensitivity ... (more)

39
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1
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1
answer
Last activity 2017-08-31 18:19:25 +0200 by endnode

NRF51 Beacon kit data packet

Hi,

what is the maximum length of broadcast data that NRF51 beacon kit supports?

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