Cubecell and DS18B20

willhelmx · April 21, 2020, 12:33pm

Hi Harria

Well we had problems with the VEXT output giving a very low voltage after reset, this seems to be a general issue if you browse the community, however somewhat neccesary unless you use some other io´s and set them low or high to turn on the DS18B20, be shure to insert a wait state and after this a reset for the device before reading so it can stabilize itself

Ie:

Power on 3.3v/5v
Wait state at least 500msek
//Init
sensors.begin();
//Read
float xxxx = (sensors.getTempCByIndex(0));

Use the TTN decoder at https://github.com/willhelmx/LMSYSTEMS/tree/master/Cube_Cell_650_lorawan_DS18Bxx
This is just a markup / Copy of Aarons decoder that will work with a single DS18xxx

BR
/A

harria · April 22, 2020, 12:55pm

Hello willhelmx,

No, still cant get it to work on the devboard… I’m also kind of running out of time, I would need in couple of weeks a working 2* DS18B20 temp sensor with preferable cubecell devboard and data to TTN.

Are anyone willing to help to develop that? I’m willing to buy a working solution, if it is affordable price I know that at least @wasn has a shop and has made tests with 18b20 sensor, can you sell a devboard + working code for this project? Of course I don’t mind to buy it from you willhelmx also, but need to get a receipt of the order, because it will be paid by my employer…

/Harri

wasn · April 22, 2020, 1:36pm

hi @harria

our ModularNode is working good with those DS18B20 sensors, but we are currently out of stock.
You can find the Firmware for these nodes in the Heltec repository under the name LoRaWAN-Multisensor.

willhelmx · April 22, 2020, 5:25pm

Wasn

Surely we should be able to help harria with this…

Harria, whats your setup today? devboard, i know + 2 DS18B20? gateway? transmission ABP or OTAA?

BR

/A

willhelmx · April 22, 2020, 5:37pm

Hi Harria

As a reply we are a company dealing in invironmental sensorsystems… But it seems unessesary to send you something when we surely would be able to help you here…

What seems to be the nr:1 problem?

Will the code compile without errors?
Can you read the sensor at all?
If so, do you get message in serial monitor = Joined?

BR

/A

wasn · April 22, 2020, 8:35pm

yes we can help that is why i directed him to a working source code.

if you post your source code and the serial output of the dev board.
we can have a look and try to get it working.

harria · April 23, 2020, 6:17pm

Hello willhelmx,

Here are the main problems:

with the devboard I cannot get any of the example codes to read the ds18b20 sensor and also the code you had working did not find the sensors (tried with 3 different sensors)
have tried both with 3.3V and 5V to sensors, and also all GPIOs on the board…
With the Capsulo I got the examples (Multiple, Onewire search and single) to find the sensors (tried with 2) and it seems to work.
But again with Capsulo I cannot get your example to work, it reads the temp as -127C and also does not join the lora network… but it is possible that it does not join because I did not add the keys to the comissioning.h file, but did it afterwards with the configurator, I also got some command not supported error when it tries to join…

With the precompiled software uploaded with cubecell configurator it joins network, so at least my Capsulo is working, but unfortunately it does not support the 18b20 sensors, I only get the bus error message…

Actually I don’t mind to use the capsulo for my project, if you can help me to get that working with two onewire sensors, I would be happy.

I’ll try to compile the code again and then if I don’t get it working, I’ll post it here so you can check what I’m possible doing wrong.

Thanks wilhelmx and wasn that you are willing to help

harria · April 28, 2020, 7:43am

Hello @willhelmx

I tried now a couple of things and the capsulo reads temperature from the sensor okay, so that is working.
After that I have tried your example code, but cant get that to work… I does not compile, I edited the comissioning.h to add there my Lora keys and then changed this:

/*LoraWan Class*/
DeviceClass_t  CLASS=A;
/*OTAA or ABP*/
bool OVER_THE_AIR_ACTIVATION = true;
/*ADR enable*/
bool LORAWAN_ADR_ON = true;
/* set LORAWAN_Net_Reserve ON, the node could save the network info to flash, when node reset not need to join again */
bool KeepNet = true;
/*LoraWan REGION*/
LoRaMacRegion_t REGION = ACTIVE_REGION;

First error is the LoraWan class, it does not like my class=A…
if uncomment that, next error is
AppDataSize = 4;//AppDataSize max value is 64

and the error is: ‘AppDataSize’ was not declared in this scope

And here is a longer error log from arduino:
WARNING: library LoRa claims to run on ASR650x-Arduino architecture(s) and may be incompatible with your current board which runs on CubeCell architecture(s).
WARNING: library RGB claims to run on ASR650x-Arduino architecture(s) and may be incompatible with your current board which runs on CubeCell architecture(s).
D:\Cube_Cell_650_lorawan_DS18Bxx\LM_LoraWan_Cube_Cell_DS18Bxx_ttn\LM_LoraWan_Cube_Cell_DS18Bxx_ttn.ino: In function ‘void PrepareTxFrame(uint8_t)’:

LM_LoraWan_Cube_Cell_DS18Bxx_ttn:85:3: error: 'AppDataSize' was not declared in this scope

   AppDataSize = 4;//AppDataSize max value is 64

   ^

LM_LoraWan_Cube_Cell_DS18Bxx_ttn:87:2: error: 'AppData' was not declared in this scope

  AppData[0] = tempout[0]; 

  ^

D:\Cube_Cell_650_lorawan_DS18Bxx\LM_LoraWan_Cube_Cell_DS18Bxx_ttn\LM_LoraWan_Cube_Cell_DS18Bxx_ttn.ino: In function 'void setup()':

LM_LoraWan_Cube_Cell_DS18Bxx_ttn:100:16: error: 'BoardInitMcu' was not declared in this scope

   BoardInitMcu();

                ^

LM_LoraWan_Cube_Cell_DS18Bxx_ttn:118:15: error: 'Enable_AT' was not declared in this scope

     Enable_AT();

               ^

LM_LoraWan_Cube_Cell_DS18Bxx_ttn:120:5: error: 'DeviceState' was not declared in this scope

     DeviceState = DEVICE_STATE_INIT;

     ^

LM_LoraWan_Cube_Cell_DS18Bxx_ttn:121:13: error: 'class LoRaWanClass' has no member named 'Ifskipjoin'

     LoRaWAN.Ifskipjoin();

             ^

D:\Cube_Cell_650_lorawan_DS18Bxx\LM_LoraWan_Cube_Cell_DS18Bxx_ttn\LM_LoraWan_Cube_Cell_DS18Bxx_ttn.ino: In function 'void loop()':

LM_LoraWan_Cube_Cell_DS18Bxx_ttn:126:11: error: 'DeviceState' was not declared in this scope

   switch( DeviceState )

           ^

LM_LoraWan_Cube_Cell_DS18Bxx_ttn:134:49: error: 'CLASS' was not declared in this scope

    Serial.printf("LoRaWan Class%X  start! \r\n",CLASS+10);   

                                                 ^

LM_LoraWan_Cube_Cell_DS18Bxx_ttn:135:12: error: 'class LoRaWanClass' has no member named 'Init'

    LoRaWAN.Init(CLASS,REGION);

            ^

LM_LoraWan_Cube_Cell_DS18Bxx_ttn:141:12: error: 'class LoRaWanClass' has no member named 'Join'

    LoRaWAN.Join();

            ^

LM_LoraWan_Cube_Cell_DS18Bxx_ttn:149:12: error: 'class LoRaWanClass' has no member named 'Send'

    LoRaWAN.Send();

            ^

LM_LoraWan_Cube_Cell_DS18Bxx_ttn:156:4: error: 'TxDutyCycleTime' was not declared in this scope

    TxDutyCycleTime = APP_TX_DUTYCYCLE + randr( 0, APP_TX_DUTYCYCLE_RND );

    ^

LM_LoraWan_Cube_Cell_DS18Bxx_ttn:157:12: error: 'class LoRaWanClass' has no member named 'Cycle'

    LoRaWAN.Cycle(TxDutyCycleTime);

            ^

LM_LoraWan_Cube_Cell_DS18Bxx_ttn:163:12: error: 'class LoRaWanClass' has no member named 'Sleep'

    LoRaWAN.Sleep();

            ^

harria · April 29, 2020, 5:12pm

Edit to my last mesage:
Modified the code so that it is not using comissioning.h anymore (or I believe so), and now got the Lora connection to work and it sends data to TTN.
But now i does not anymore read the DS18B20 sensors… not even with the example code that worked earlier… I just get -127 as reading from the sensor…

ernst.schulz · April 29, 2020, 5:58pm

Can you try it with an other sensor?

harria · April 30, 2020, 11:38am

Well, now it is working again, I think I just had some bad connection…
But still have the problem to get the data on to TTN, or actually it does only read -127C, and when I try to add a function to read the sensors before sending data, it gets stuck after it has joined the network.
Here is the code if someone can help (I deleted lora keys and other things that are working and does not affect the reading of sensor)
/Harri

#include "LoRaWan_APP.h"
#include "Arduino.h"
#include <OneWire.h>
#include <DallasTemperature.h>

// Data wire is plugged into GPIO1 on the CubeCell
#define ONE_WIRE_BUS GPIO1
#define TEMPERATURE_PRECISION 9

// Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs)
OneWire oneWire(ONE_WIRE_BUS);

// Pass our oneWire reference to Dallas Temperature.
DallasTemperature sensors(&oneWire);


/* Application port */
uint8_t appPort = 2;

uint8_t confirmedNbTrials = 8;

/* Prepares the payload of the frame */

static void prepareTxFrame( uint8_t port )
{

    // Read temperatures from DS18xxx
  sensors.begin();
  float temp = (sensors.getTempCByIndex(0));
  Serial.print("Content of temp float value from Sensor: = ");
  Serial.print(temp);
  Serial.println (" Degrees Celsius");
  Serial.println ("Preparing to send data via Semtex Radio ");
  Serial.println();
  delay(500); // Wait for a while before proceeding
 
  unsigned char *tempout;
  tempout = (unsigned char *)(&temp);
	uint16_t batteryVoltage = getBatteryVoltage();

  appDataSize = 6;
	appData[0] = tempout[0];
	appData[1] = tempout[1];
	appData[2] = tempout[2];
	appData[3] = tempout[3];

	appData[4] = (uint8_t)(batteryVoltage>>8);
	appData[5] = (uint8_t)batteryVoltage;
	
	Serial.print("BatteryVoltage:");
	Serial.println(batteryVoltage);
}

void setup() {
  pinMode(Vext, OUTPUT);
  digitalWrite(Vext, LOW);
  delay(10);
  boardInitMcu();
  sensors.begin();
	Serial.begin(115200);
  Serial.println("LORAWAN (LM) Dallas Temperature IC Control single sensor demo");
 
  Serial.print("Requesting temperatures...");
  sensors.requestTemperatures(); // Send the command to get temperatures
  delay(2000);
  Serial.println("DONE");
  delay(2000);
  Serial.print("Temperature for the device 1 (index 0) is: ");
  Serial.print(sensors.getTempCByIndex(0)); 
  Serial.println (" Celsius");
  delay(2000);
  
#if(AT_SUPPORT)
	enableAt();
#endif
	deviceState = DEVICE_STATE_INIT;
	LoRaWAN.ifskipjoin();
}

void loop()
{
	switch( deviceState )
	{
		case DEVICE_STATE_INIT:
		{
#if(AT_SUPPORT)
			getDevParam();
#endif
			printDevParam();
			LoRaWAN.init(loraWanClass,loraWanRegion);
			deviceState = DEVICE_STATE_JOIN;
			break;
		}
		case DEVICE_STATE_JOIN:
		{
			LoRaWAN.join();
			break;
		}
		case DEVICE_STATE_SEND:
		{
    sensors.requestTemperatures(); // Send the command to get temperatures again to refresh at every transmission
    delay(750);
			prepareTxFrame( appPort );
			LoRaWAN.send();
			deviceState = DEVICE_STATE_CYCLE;
			break;
		}
		case DEVICE_STATE_CYCLE:
		{
			// Schedule next packet transmission
			txDutyCycleTime = appTxDutyCycle + randr( 0, APP_TX_DUTYCYCLE_RND );
			LoRaWAN.cycle(txDutyCycleTime);
			deviceState = DEVICE_STATE_SLEEP;
			break;
		}
		case DEVICE_STATE_SLEEP:
		{
			LoRaWAN.sleep();
			break;
		}
		default:
		{
			deviceState = DEVICE_STATE_INIT;
			break;
		}
	}
}

wasn · April 30, 2020, 12:39pm

is the serial console of the cubecell outputting -127C for the sensor value or TTN?
please post your decoder as well.

harria · April 30, 2020, 1:09pm

Both the serial monitor and TTN are showing -127
But I wonder if these rows in the code has something to do with that:

case DEVICE_STATE_SEND: { sensors.requestTemperatures(); // Send the command to get temperatures again to refresh at every transmission delay(750);

If I have them in my code it will join the network, but after Joined message nothing happens, so it does not send any data. If I take that away from the code, it sends data.
Here example from the console:

30.04.20 13.42.25: Content of temp float value from Sensor: = -127.00 Degrees Celsius

30.04.20 13.42.25: Preparing to send data via Semtex Radio 

30.04.20 13.42.25: 

30.04.20 13.42.26: BatteryVoltage:4180

30.04.20 13.42.26: confirmed uplink sending ...

30.04.20 13.42.27: receive data: rssi = -95, snr = -2, datarate = 5

And here are my decoder (I know that battery voltage is missing):

function Decoder(bytes, port) {
    var decoded = {};


  return decoded;
}function tofloat32(a1,a2,a3,a4){
                                var s=(a1&0xff)>>7;
                                var E=(a1<<1&0xff)|a2>>7;
                                var M0=(a2&0x7f)<<16|a3<<8|a4;
                                var M=1;
                                for(var i=0;i<23;i++)
                                {
                                  if(M0>>i&0x01==1)
                                    {
                                      M=M+Math.pow(2,i-23);
                                    }
                                }
                                var result=Math.pow(-1,s)*M*Math.pow(2,E-127);
                                return result;
                                }

function Decoder(bytes, Port)
{
                      var temperature = tofloat32(bytes[3],bytes[2],bytes[1],bytes[0]);
                      
                      var result={
                                    " ":{
                                               "Temperature Celsius":temperature,
                                      		
                                             }
                                  }
                         return  result;
                      }

wasn · April 30, 2020, 1:26pm

Please add a vext down at the end of setup.
And enable vext atcthe start of txprepare and disable it at the end.
Vext wont stay on when the devices sleeps

harria · April 30, 2020, 2:57pm

It’s working Thanks a lot Wasn
now I still need to get a second sensor on same board to send data…
and troubleshoot why I can’t get it to work on the dev kit… only on the capsulo

/Harri

wasn · April 30, 2020, 3:59pm

you can try to use a different gpio on the dev board.
gpio1 should normally work but perhabs this pin has a failure on your board.
be shure to use 3.3V for powering the sensor, cause 5v could harm the gpio

helianto · October 15, 2020, 9:39pm

I have another error… when compiling default example:

“C:\Users\javier\OneDrive - mail.ccsf.edu\Documentos\Arduino\libraries\DallasTemperature/DallasTemperature.cpp:446: undefined reference to `yield()’
collect2.exe: error: ld returned 1 exit status
exit status 1
Error compilando para la tarjeta CubeCell-Board（HTCC-AB01）”

Druilhe · October 20, 2020, 7:19am

Hello,
Using an oscilloscope , it is possible to read the content of the scratchpad area and write commands to the DS18B20 to retrieve the value of the tempertaure. I write below the link for one solution among several to read temperature from DS18B20 without the OneWire library and perhaps the functions in this example will meet your needs.

Best regards.

Luis_Striker · October 30, 2020, 12:05am

Hello, greetings from Mexico.
Here I bring you what worked for me and where the error seems to be because the DS18B20 sensor does not work initially.
If you have previously worked with the DS18B20 sensor, it is obvious that you must already have the onewire.h library installed. This is where the error occurs. When you install everything related to the CubeCell, there are some libraries edited to work with it, and one of them is onewire.h. If I remember correctly, this is here:
C:\Users\Luis\AppData\Local\Arduino15\packages\CubeCell\hardware\CubeCell\1.1.0\libraries

The Arduino IDE is calling by default the one you had previously installed and it does not work with the Cube Cell. Therefore what you have to do is remove it from your libraries. The one you have to remove is here:
C:\Users\Luis\Documents\Arduino\libraries

I hope this will help you, it took me two days doing tests and reading to make my sensor work, lol =).

Greetings

Digy · January 26, 2021, 3:08pm

Hi Luis
I had the same problem (display -127).
I have now used the onewire.h from Heltec and everything works. Thank you for your tip