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Last activity 2017-08-05 12:50:07 +0200 by endnode

How to send large data through BLE notification using nrf52832

Hi everyone,

I am writing a program in Keil whereby I have to send a large amount of data through BLE notification in real time. The program works by having two timers, one timer is used for the ADC to ... (more)

19
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answers
Last activity 2017-08-02 16:15:15 +0200 by fran

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)

44
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Last activity 2017-07-18 05:29:15 +0200 by Nikhil

Reading the Analog input on NRF51

https://github.com/NordicSemiconducto... I have flashed the above program in the link on to my nrf51822 DK. I can see the values of the samples but i do not understand what the output is. The analog pin that is ... (more)

80
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answers
Last activity 2017-07-13 21:47:41 +0200 by Otavio Borges

SAADC low power SDKv13.0.0 and S132

Hello,

I'm currently developing an application on nrf52832 that'll use SAADC low power to fetch battery voltage level and report that value on BLE advertising data. I've adapt github example nFRF52-ADC-examples to the following:

#define REFERENCE_TO_MV     0 ...
(more)

50
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no
votes
1
answer
Last activity 2017-07-11 21:07:07 +0200 by JTL

not getting NRF_SPI_EVENT_READY event

Hi - In my app, I'm using Bluetooth, the ADC, the TWI, and the SPI. The general idea is to measure lots of things, store the data in SPI NOR FLASH, and occasionally flush some data through BLE. All is ... (more)

27
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1
vote
1
answer
Last activity 2017-07-06 23:26:13 +0200 by RK flag of Singapore

High Frequency Pin for Clocking External ADC [closed]

Hello,

I'm starting to work with a new ADC that I need to drive with an external 4MHz clock that I will need to drive with my MCU. Is there a way to set up a pin to passively ... (more)

53
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no
votes
2
answers
Last activity 2017-07-03 16:32:24 +0200 by Jørn flag of Norway

ADC with internal pull up

This is for the nRF51822.

I have done some tests where I configure a pin as input with pull up enabled and then reconfigure the pin for an adc measurement with 1/3 prescaler with band gap reference.

It looks ... (more)

1k
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2
votes
2
answers
Last activity 2017-07-03 13:40:04 +0200 by chehab

Reading ADC values from multiple pins

Hello, I'm using nRF51822-mKIT for a research.

I recently posted a question related to "reading ADC value from analog input", having issues with reading proper ADC value from input pin. However, after narrowing down, I have found out that ... (more)

85
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no
votes
1
answer
Last activity 2017-06-29 11:56:21 +0200 by Luk3

SAADC very high noise.

Hardware: nrf52 DK Software: SDK v13

I want to use SAADC to sample some analog data (main function of my device), but It seems to be noisy. In attachment spreadsheet with chart and recorded data.

Reference = VDD/4, input = VDD ... (more)

31
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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)

75
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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)

76
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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)

109
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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);

75
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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)

119
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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)

58
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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)

61
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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)

107
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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)

59
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no
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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)

61
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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)

39
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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)

85
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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)

68
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no
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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)

294
views
2
votes
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)

92
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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)

130
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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)

89
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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 ?

88
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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)

134
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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)

66
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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)

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