@nca78 yeah I noticed that, what is the downside of the NRF52810?

@neverdie well, July 2017 they were €4,15. So they went up around 1 euro in a year. FYI the last one I bought was about 5 months ago since then they went up from version 1,1 to 1,3.
Also, the item number changed a bit (but the datasheet checks out).
It went from E73-2G4M04S to E73-2G4M04S1B, and the introduced a nrf52810 E73-2G4M04S1A with the same footprint and pinout.

Not sure if it is allowed, else I remove this post, but the nrf52832's at ebyte are for sale (50% off)the coming 2 days.cdebyte AliExpress I sure grab myself some (max 2 at a time, but last time I ordered multiple times :)) only €2,62 a piece

https://forum.mysensors.org/topic/6961/nrf5-action/1659

That fixed it.

Hey,

I got an issue with getting my custom board with SI7021 under 450uA.

• Ebyte 52832

I use the Sparkfun library to read data from it

I did some deductions.

• When I insert sensor.begin(); it starts using quite an amount of power when sleeping.

• When I remove this line it shoots down to around the 10ua.

• I tried 2 board, that are identical, with exactly the same results

This happens also when I use this code on a board that doesn't have a SI7021 soldered onto it. So I don't think it is the SI7021.
SDA/SCL are both connected with a 10K pull-up.

My guess is that is has something to do with it being a thing with the NRF.

the readings from the SI7021 seem legit, so it works, but the sleep current wrecks my battery life.

Is there someone that can help me with this?

The same old story, when you finally go looking for help, you find your answer.
It indeed looks like it has something to do with the NRF52.
as mentioned: https://github.com/sandeepmistry/arduino-nRF5/issues/291#issuecomment-407492282

A workaround for the symptoms is known and described at:
http://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.nrf52832.Rev1.errata%2Fanomaly_832_89.html&cp=2_2_1_0_1_26

Solution:

you need to add the following lines to shutdown the i2c:

NRF_TWI1->ENABLE=TWI_ENABLE_ENABLE_Disabled << TWI_ENABLE_ENABLE_Pos;
*(volatile uint32_t *)0x40004FFC = 0;
*(volatile uint32_t *)0x40004FFC;
*(volatile uint32_t *)0x40004FFC = 1;

And when you need some readings, just call "sensor.begin(); " to go on your way.

I measure 00.01 mA now, (multimeter doesnt go into the uA ranges )

Maybe @d00616, or someone else can work this into a standard routine (this is way out of my league, i can dump it into my sketch, but dont have a clue what it is doing)

dots123 created this issue in sandeepmistry/arduino-nRF5

closed I2C AND attachInterrupt current consumption in sleep mode #291

Hey,

I got a question, I've built a PCB with a PIR-motion detector and a SI7021 temp/Hum sensor.

It all works great except for the power usage when the sensor is asleep.

Two scenarios happen, that I can't quite explain, but hopefully someone here can.

1. The power consumption is under the 0.01 when I only use the PIR sensor.
2. When I include sensor.begin(); the sleeping current jumps to 0.46 mA.

When I comment the "sensor.begin();" out it returns to 0.01mA.

schematic etc: https://www.openhardware.io/view/617/NRF52-Wall-Node-3-AAA

-- Might it be that is has something to do with it using a NRF52?

#define MY_DEBUG

#define MY_RADIO_NRF5_ESB
#define MY_NODE_ID 214

#include <MySensors.h>

#define SKETCH_NAME "PIR TESTING"
#define SKETCH_VERSION "v0.1"

int PIRLED = 29;
int ActLED = 6;
int PIR_pin = 2;

int a;
int b;

#include <Wire.h>
#include <SI7021.h>

SI7021 sensor;


void setup() {
  Serial.begin(115200);
  sensor.begin();

  pinMode(PIRLED, OUTPUT);
  pinMode(ActLED, OUTPUT);      
  pinMode(PIR_pin, INPUT);        
}

void loop() {
sleep(5000);
a = digitalRead(PIR_pin);
Serial.println(a);
delay(500);
  
}```

For anyone interested, and to correct my mistakes, I just put up an NRF52 node that is powered by an off the shelf ac/dc converter to be used as a repeater node.. feel free to comment

https://www.openhardware.io/view/613/NRF52-Wall-Node-ACDC

This topic did most of the research for me, so thank you

Is it possible, or will it be possible to build a combination between wired and wireless nodes?

@Nca78
Getting rid of the ground plains around the entire module hugely improved the range. Had to stap back to AAA batteries to fit on the board. But I'm happy with the way it's going (AA is still possible but not soldered on it just doesn't fit enough in the wall socket)

@alowhum

Hey, sorry, I'm not familiar with your error messages.

Can you please sum everything up what you did so far and what your setup looks like (pic)

• Drivers
• Libraries
• what software you use
• Number of modules you tested
• etc

just to retrace your steps ( It might be useful to post it in a separate topic to keep this one cleaner ) => https://forum.mysensors.org/category/5/troubleshooting