Hello,
I cannot get the DS18B20 onewire sensor to work on cubecell devboard and I just can’t understand what I’m doing wrong… I tried all of the onewire examples available in arduino, but cannot get it working…
I get error: No more addresses.
or : then it just gives -127 as reading for the sensor, depending on the example I use.
Can anyone help? would be really happy for any ideas 
/Harri
have you tried the examples in the CubeCell repository?
Yes, have tried also that example and only get:
“Temperature for the device 1 (index 0) is: -127.00”
So I really don’t have ideas what could be wrong… measured voltage on the sensor and that is okay, also tried with 3 different sensors (one of them has been working before with another board).
/Harri
are you using parasite oder external power for the sensor?
have you the resistor in place?
Here is a picture of how it is connected, I believe it should be right connected, powered from Vext from the dev board, 4,7kohm resistor between Vdd and data.
Edit:
Tried it on capsulo, same problem…
Did you solve it? otherwize try and connect to the 3.3 or 5v and see if it works
BR
/A
Hello @willhelmx
Now finally I got the sensors to work, but on the capsulo, not on dev board… could it be faulty dev board?
But still having some problems to get it to work with TTN… will try some more later today
/Harri
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
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
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.
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
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?
BR
/A
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.
Hello willhelmx,
Here are the main problems:
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
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();
^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…
Can you try it with an other sensor?
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;
}
}
}is the serial console of the cubecell outputting -127C for the sensor value or TTN?
please post your decoder as well.
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;
}