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Last activity 2017-04-27 10:48:27 +0200 by newtom

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)

66
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)

30
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no
votes
no
answers
Last activity 2017-04-25 12:54:55 +0200 by stefano.luna

Problem with SAADC examples for audio sampling

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)

31
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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)

69
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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)

63
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)

86
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no
votes
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)

49
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)

91
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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)

28
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)

69
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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?

17
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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)

75
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!

330
views
1
vote
1
answer
Last activity 2017-03-29 13:31:18 +0200 by endnode

Beacon scenario

Hi,

I wanted to know that if I have e.g. 10 beacons placed in the super market. Let say I am in the meat section and there are three beacons among which I am close to one and little ... (more)

46
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no
votes
no
answers
Last activity 2017-03-29 10:55:50 +0200 by Usman

Connecting Old nokia 3310 to NRF52

Hi,

I want to connect old nokia 3310 to NRF52 DK.

Please let me know if any one has information about it?

Based on my research old nokia phone uses M bus and F bus communication protocol so then how ... (more)

93
views
no
votes
1
answer
Last activity 2017-03-29 09:22:35 +0200 by PrithviRaj Narendra flag of India

What is the voltage range for ADC in nrf52832?

I went through a similar post for nrf51 which explains the numbers pretty well (https://devzone.nordicsemi.com/questi...). I wanted to know what the values are for nrf52. The internal reference seems to have changed from 1.2V (nrf51 ... (more)

44
views
no
votes
1
answer
Last activity 2017-03-22 14:41:08 +0200 by MC

Battery service with 12v Lithium ion battery

Hello,

I am new to nrf51822 BLE. I am using MDBT40 (nrf51822 series). Complete project is powered by 12V, 2500 Mah lithium ion Battery pack. I want to monitor battery level using battery service provided in nordic examples. Please let ... (more)

73
views
no
votes
no
answers
Last activity 2017-03-21 14:54:33 +0200 by Usman

Keil + nrfjprog = true ( PCA10040) problems

I have done erase all thing.

But in the second step, I am getting following error.

nrfjprog --program s132_nrf52_3.0.0_softdevice.hex ERROR: The --family option given with the command (or the default from ERROR: nrfjprog.ini) does not match ... (more)

55
views
no
votes
1
answer
Last activity 2017-03-21 06:37:11 +0200 by copperface

ADC does not work when I disable UART

Here is my question.

I always disable uart after I send data.

NRF_UART0->TASKS_STOPTX = 1;
NRF_UART0->ENABLE = UART_ENABLE_ENABLE_Disabled;

this was write in the function of:

uart_event_handler

and in the case of APP_UART_TX_EMPTY evt->type.

Before I send data, I always ... (more)

56
views
3
votes
1
answer
Last activity 2017-03-14 15:20:42 +0200 by endnode

Power supply NRF52

Hi,

I want to know that what should be the supply voltage to NRF52 IC. Another thing is that we want to connect our product with NRF52. Our product has TTL wires which has TX, RX, GND, RTS, CTS and ... (more)

104
views
no
votes
1
answer
Last activity 2017-03-14 14:33:40 +0200 by Jørn flag of Norway

NRF51822 ADC

Dear,all

SDK:8.1.0 s110

  1. VDD use 2.6--3.6V,use VDD bandgap: (ADC_CONFIG_REFSEL_SupplyOneThirdPrescaling << ADC_CONFIG_REFSEL_Pos)
    ADC_CONFIG_INPSEL_AnalogInputOneThirdPrescaling << ADC_CONFIG_INPSEL_Pos , when adc measurement the voltage of 1.8V, the NRF_ADC->RESULT is 510;

  2. VDD use 1.7-2.5V,use VDD bandgap ...

(more)

36
views
no
votes
1
answer
Last activity 2017-03-10 13:03:28 +0200 by Sigurd flag of Norway

TTL and RS232

Hi,

I want to know that what is the different between RS232 and TTL.

I want to know that can we two RS232 to TTL converters back to back in the wire ??

76
views
no
votes
1
answer
Last activity 2017-03-09 09:08:04 +0200 by endnode

Bluetooth headphone chip

Thank you for the support so far.

I want to ask that if for example in your system or product we want to add bluetooth headphone feature which support Bluetooth 4.0 headphones then what one should do in that ... (more)

33
views
no
votes
no
answers
Last activity 2017-03-09 08:29:56 +0200 by Liverpool007

How do i read the adc data on coap? [closed]

i set up an coap/iot environment and but i was getting error while compiling code for adc i followed steps from this post https://devzone.nordicsemi.com/questi... here is the problemcoap1234.png

54
views
no
votes
1
answer
Last activity 2017-03-07 12:58:27 +0200 by Kristin flag of Norway

How to send Nordic data to computer wirelessly (Not by UART).

Hello,

We have connected Nordic+ MPU 9250 and able to read sensor values through UART display, but we wanted to do some excercises and read values, but it's not possible with wired connection, Can we get values to PC ... (more)

38
views
no
votes
1
answer
Last activity 2017-03-07 09:32:29 +0200 by Jørgen Holmefjord flag of Norway

NRF_DRV_ADC_DEFAULT_CHANNEL compiling error

Hi, When compiling my program on SEGGER embedded studio I get the error:

  Compiling ‘main.c’
    main.c
    expected expression before '{' token
    in expansion of macro 'NRF_DRV_ADC_DEFAULT_CHANNEL'

In the code:

    #define ADC_RIGHT   ADC_CONFIG_PSEL_AnalogInput2
    #define ADC_DOWN    ADC_CONFIG_PSEL_AnalogInput3
    #define ADC_LEFT    ADC_CONFIG_PSEL_AnalogInput4
    #define ...
(more)

87
views
1
vote
1
answer
Last activity 2017-03-05 00:22:44 +0200 by Robert Massaioli

ADC + PPI + Timer on the nRF51822 polling too fast

I have the following ADC code: https://bitbucket.org/snippets/robert...

I have been trying for the past few days to get this code to just perform a single ADC scan, on five channels, once every 100ms.

It seems like ... (more)

114
views
1
vote
1
answer
Last activity 2017-02-27 15:40:59 +0200 by Jørgen Holmefjord flag of Norway

v12.2.0 SDK ADC bug: Size should be uint16_t and not uint8_t

Setting up an example of the problem

As I promised in this thread, I have been testing out the ADC on the nRF51822 and trying to see how quickly I can sample per minute vs how many interrupts I trigger ... (more)

56
views
no
votes
1
answer
Last activity 2017-02-24 09:39:42 +0200 by Jørgen Holmefjord flag of Norway

nRF52 ADC voltage divider calculations

I am interested in optimising inputs for ADC measurement on an nRF52. I have seen quite a bit about nRF51 but am unsure if this remains relevant for nRF52?

35
views
no
votes
1
answer
Last activity 2017-02-23 11:22:48 +0200 by Petter Myhre flag of Norway

how to migrate sdk10 s110 to sdk12.2

how to migrate sdk10 to sdk12.2

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