Hi everyone, post #1 here (obviously).
I am seeking help for a problem which is likely very simple but I keep missing it for some reason.
I have spent most of my career in IT on the network and infrastructure side of things, and just recently got into Home Automation, IoT, SBCs, etc. which takes me here on my journey.
I have an ambitious (for me) project of automating Aquarium maintenance based on the output of several sensors (pH, temperature, TDS, water level, etc.)
I have to start somewhere so trying to set up the Water temperature sensor.
My HW:
- Arduino MKR WiFi 1010 Board
- DS18B20 Waterproof 1wire temperature probe
- 4.7kOhm resistor
- Breadboard and jumper wires
SW enviroment
- Arduino IDE 2.3.4 on Win11
- Latest Onewire library
- Latest DallasTemperature library
- Board firmware upgraded to 2.0
I have everything wired up as per examples and recommendations, yet, no dice.
I am powering up the probe with 3.3V from the board, GND is connected, DataPin also connected to the board, 4.7kOhm pull-up resistor between 3.3V and Data (DQ) pin.
Using a multimeter, I can measure up 3.3V between power and GND pins on the probe, and between DQ and GND. I can measure the 4.7kOhm resistance between DQ and PWR pins as well.
The board does not seem to detect the probe and the reading is a consistent -127C. Also querying the wire for the number of connected probes returns 0.
I have tried switching wires for Data pin (and update the code appropriately), changing physical probes, solidifying connections and contacts, yet it just won't work.
I've been at it to make it work for some time now and thought I`d seek help before giving up and just crawling into a hole.
Here is the code I am using. (DQ connected to pin 5 and VCC on pin 8)
#include <OneWire.h>
#include <DallasTemperature.h>
int numberOfDevices = 1;
// Broche DQ du capteur = 5, DC 3V3 = 8
#define ONE_WIRE_BUS 5
const int BrocheVCC = 8;
// Créer un objet OneWire
OneWire oneWire(ONE_WIRE_BUS);
// Passer l'objet OneWire à Dallas Temperature.
DallasTemperature sonde(&oneWire);
void setup() {
// Initialiser la communication série
Serial.begin(9600);
// Démarrer la librairie de température
sonde.begin();
// Alimenter la sonde
pinMode(BrocheVCC, OUTPUT);
digitalWrite(BrocheVCC, HIGH);
}
void loop() {
// Demander aux capteurs de mesurer la température
sonde.requestTemperatures();
// Afficher la température en degrés Celsius
Serial.print("Temperature : ");
Serial.print(sonde.getTempCByIndex(0));
Serial.println(" °C");
// Grab a count of devices on the wire
numberOfDevices = sonde.getDeviceCount();
Serial.print(numberOfDevices);
Serial.println(" devices found");
delay(1000);
}
I appreciate any help anyone can provide.
Thanks,
Hugo
