RSS
Sort by » date activity ▼ answers views votes

267 questions

Tagged
  • x
15
views
no
votes
no
answers
Last activity 2017-06-15 10:40:31 +0200 by bryanhsieh

Nordic NFR52832 Two Masters with FTDI SPI-USB Bridge [closed]

Hi all,

I am making a device which involves using nfr52832(PCA10040) to communicate with a NAND flash through spi to store data acquired from the ADC. After all the data has been stored, the device is then plugged into ... (more)

55
views
no
votes
1
answer
Last activity 2017-06-14 13:20:17 +0200 by Kristin flag of Norway

Why does UART require CRC

In this app by Nordic

https://github.com/adafruit/Bluefruit...

a cyclic redundancy check (CRC) is added to the payload byte array before writing it to the UART receiving characteristic.

Is the CRC necessary? Doesn't the BLE stack add ... (more)

53
views
1
vote
1
answer
Last activity 2017-06-12 12:47:12 +0200 by Jørgen Holmefjord flag of Norway

Sensing 12V battery voltage [closed]

Hello,

I am using nrf51822 SDK11 S130. I am using my custom design board which is powered by 12V. The nrf51822 is provided with 3.3V. I used 27k and 9.53K resistors in potential divider configuration and the node ... (more)

79
views
1
vote
1
answer
Last activity 2017-06-12 10:41:35 +0200 by Jørgen Holmefjord flag of Norway

adc Calculation

AD value and voltage conversion between the calculation formula

adc_config.resolution = NRF_ADC_CONFIG_RES_10BIT;
adc_config.scaling    = NRF_ADC_CONFIG_SCALING_INPUT_ONE_THIRD;
adc_config.reference  = NRF_ADC_CONFIG_REF_VBG;

nrf_adc_configure(&adc_config);

40
views
no
votes
1
answer
Last activity 2017-06-06 14:47:30 +0200 by Kristin flag of Norway

Beacon disconnects and stops transmitting after a period of time

Good Afternoon,

I hope someone can point me in the right direction.

We've customised an NRF51822 beacon and made it into a sensor but there seems to be an strange error, I'm a bit lost as to where ... (more)

78
views
1
vote
1
answer
Last activity 2017-06-01 16:30:37 +0200 by yulya

Measuring Vbat (2xAAA cell) with nRF52

Hello, I tryed to find in Q&A something that can help me understand how it is possible to measure battery voltage with nRF52, but i am not sure i found the exact explanations. I am using primary 2xAAA cell ... (more)

47
views
no
votes
1
answer
Last activity 2017-05-30 21:30:13 +0200 by endnode

nrf51 Smart Beacon consuming too much battery

Hello,

I developed an application for the nrf51822 Smart Beacon, SDK11 s130, that basically advertises the battery lvl of the beacon, the staus of button_1 and the number of times that button_1 was released. For handling the button events I ... (more)

44
views
1
vote
1
answer
Last activity 2017-05-26 23:51:12 +0200 by Carsten Wulff

SAADC Limit Monitoring

Hello,

I'm writing an application that uses the SAADC and would like to set up a high limit to trigger on.

If I use the following code, I'm able to trigger 1 ADC sample successfully:

errCode = nrf_drv_saadc_buffer_convert( &adcValue ...
(more)

86
views
1
vote
1
answer
Last activity 2017-05-24 13:57:52 +0200 by Jørn flag of Norway

Capacitance reading circuit for nRF51

Currently, we are trying to have the nRF51 chip working with a type of capacitive pressure sensor. We did quite a lot of work on searching proper circuits of reading the capacitance of the sensor, including capacitance voltage divider, charging ... (more)

38
views
no
votes
no
answers
Last activity 2017-05-19 14:40:12 +0200 by MVR

Proximity Profile (Battery Measurement) not updating when SAADC LP mode Enabled

I am using SDK 12.2.0 with soft device s132 3.0.0 using NRF52 Development Board(PCA10040).

I want to update Battery level to central device/APP.As i want to use code for my custom Board i ... (more)

44
views
no
votes
1
answer
Last activity 2017-05-18 14:43:40 +0200 by Jørgen Holmefjord flag of Norway

nrf51822 ADC enable means what?

Is enable required before configuration? Does toggling NRF_ADC->ENABLE reset the configuration (like it does for the radio?) Is the power to the ADC automatic, so that even if enabled, it might be quiescent current?

The product spec, register description ... (more)

37
views
no
votes
1
answer
Last activity 2017-05-15 23:34:22 +0200 by sid

Bluetooth stops working after integrating ble_nus service

Hello developers, I am trying to integrate ADC, TWI based MPU6050 for accelrometer with ble_nus service for data transmission. The ADC and MPU6050 works perfect but once I integrate ble_nus the code compiles but my NRF51 DK does not advertise ... (more)

57
views
no
votes
1
answer
Last activity 2017-05-15 15:20:47 +0200 by Jørn flag of Norway

nRF52832 SAADC circuit R_INPUT value

Hi there,

I am getting some error in my SAADC measurements and I believe it's due to the R_INPUT forming a parallel resistance with my voltage divider at the input (the voltage divider is meant to scale down the ... (more)

48
views
no
votes
no
answers
Last activity 2017-05-15 11:53:18 +0200 by pavanvulichi

find out adc sampling time

hello,i am using nrf52 DK.I was testing ADC example code .I am giving acq time is 3microsec .I want to find the total time is taken to sample adc for one sec.In data sheet if acq time ... (more)

169
views
1
vote
3
answers
Last activity 2017-05-11 10:02:50 +0200 by Jørn flag of Norway

I2S does not work as expected on nRF52832

Hello,

some time ago I was struggling with interfacing an I2S microphone with the nRF52832. That remained unsuccessful. My conclusion back then was that the selected I2S microphone and the nRF52832 were incompatible (the mic wanted 32-bit word size, which ... (more)

44
views
no
votes
no
answers
Last activity 2017-05-09 13:50:17 +0200 by tomkawal flag of United Kingdom

Low power ESB Tx nRF52832 nrf_pwr_mgmt_run

Using existing examples in SDK13, I prepared ADC sampling app which works fine in ESB TX mode. Works well sending frames at 10ksps, and I can also put it to 'standby mode' by remote command from RX, when it wakes ... (more)

94
views
no
votes
2
answers
Last activity 2017-05-04 14:23:35 +0200 by Jørn flag of Norway

ADC input maximum voltage

I have a sensor which has output in the range of 0-5V. I want to connect it to an nrf51822 GPIO pin and to be able to read the value via it's 10 bit ADC. Is there any guide ... (more)

81
views
no
votes
no
answers
Last activity 2017-05-04 13:29:12 +0200 by Usman

NRF52 power consuption when receiving data

Is there any data about power consumption of NRF52 when it is receving data from other device ?

85
views
no
votes
1
answer
Last activity 2017-04-26 12:27:10 +0200 by Jørgen Holmefjord flag of Norway

How to change the data type from integer to floating point so i can read floating ponit voltages on copper coap?

I have an iot/coap environment setup and i want to read input voltage connected to p0.01.I can read the input in terms of resolution(0-1023).I can convert this values to voltage(0-3).I want to read ... (more)

101
views
2
votes
no
answers
Last activity 2017-04-25 12:54:55 +0200 by stefano.luna

Problem with SAADC examples for audio sampling [closed]

I am using nRF52 pca10400 and I would sample some audio signal for short periods of time, but I found a lot of difficulties with the SAADC example from sdk 13, since if I put a value greater than 126 ... (more)

54
views
no
votes
1
answer
Last activity 2017-04-24 13:12:59 +0200 by Jørgen Holmefjord flag of Norway

nRF5 with input-multiplexer on ADC pin, optimization required

Hey, I am trying to sample from 10 analog sensors and stream the results via bluetooth. Since the nRF5 is on a board that only lets me access 5 Pins, I am using a 16:1 multiplexer connected to a ... (more)

100
views
no
votes
1
answer
Last activity 2017-04-21 13:32:50 +0200 by Usman

Tx power Beacon and NRF52

Hi,

I want to know Tx power and duty cycle information of Beacon and NRF52 for the following cases:

In our case NRF52 will be our receiver and Beacon will be transmitter.

Consider NRF52 as an master and beacon as ... (more)

164
views
1
vote
1
answer
Last activity 2017-04-19 14:18:59 +0200 by Jørgen Holmefjord flag of Norway

ADC Sampling with Softdevice

Hi Everyone,

I am working on a hobby project with nRF51822 which needs me sample upto 4 signals reliably at 500Hz each at 10bit resolution. I have read through few posts in the forum([1],[2],[3]) and found that ... (more)

145
views
1
vote
no
answers
Last activity 2017-04-18 15:56:40 +0200 by stefano.luna

How can I sample audio and send data via ble on nRF52?

Hi, my setup is:

  • nRF52 DK PCA1040 v1.0.1;
  • Adafruit MAX9814 electret microphone amplifier;

My project concerns about:

  1. Sampling audio from the board with SAADC. A starting point could be, for example, 1s audio record every 15 seconds with ...
(more)

65
views
1
vote
1
answer
Last activity 2017-04-18 15:28:34 +0200 by Stian flag of Norway

Why is 270 mV offset added to voltage read by ADC?

In this example code:

nRF5_SDK_13.0.0_04a0bfd/examples/ble_peripheral/ble_app_proximity/main.c

Where the ADC is configured to read the battery voltage:

nrf_saadc_channel_config_t config =
    NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_VDD);

Why is this 270 mV offset added to the voltage read by the ADC ... (more)

136
views
no
votes
1
answer
Last activity 2017-04-12 09:34:16 +0200 by Jørgen Holmefjord flag of Norway

How to install NRFGO studio along with its other tools?

I am working on a BLE project, n i have bought nrf51822 BLE nano chip. but honestly speaking i got stuck in installation itself. i have tried the blinky, HRM examples given by MBED and they work fine. But while ... (more)

49
views
1
vote
1
answer
Last activity 2017-04-11 16:22:26 +0200 by jcormier

nrf52832 SDK12.2 NRF_LOG stops working after arm_rfft_q15

Have project setup to read values from ADC and then run fft_process. Then print them out over uart using NRF_LOG_* statements. However after we call the arm fft functions, the NRF_LOG functions stop printing. The debugger confirms that the program ... (more)

79
views
no
votes
1
answer
Last activity 2017-04-10 15:57:04 +0200 by Hung Bui

Question about continuous mode ADC NRF24LE1

In the product specification page 165, I see than the continuos mode is 2 to 16kbps. In the page 167 this mode is 2 to 16ksps.

Which unit is correct, kbps or ksps?

If that were 16ksps at 12 bits = 192kbps?

20
views
no
votes
1
answer
Last activity 2017-03-30 13:56:38 +0200 by Torbjørn Øvrebekk

nRF51422 ADC input resistance and current consumption

Hi. I have a custom board, which I power up via AAA battery through a buck-boost converter. I wan't to measure battery level using on-chip ADC only on requests from master device. What should be the expected current consumption ... (more)

156
views
2
votes
1
answer
Last activity 2017-03-30 08:56:04 +0200 by Jørgen Holmefjord flag of Norway

Difference Between "nrf_drv_adc_buffer_convert" & "nrf_drv_adc_sample_convert" [closed]

Hi,

I am newbie to Nordic and I am building a program that samples adc value. I just wanna know about the difference between two functions "nrf_drv_adc_buffer_convert"and "nrf_drv_adc_sample_convert".

How is the usage different?

(I'm using SDK11)

Thanks!

Statistics

  • Total users: 22278
  • Latest user: Camilla Samons
  • Resolved questions: 9667
  • Unanswered questions: 2797
  • Total questions: 23073