DS18B20 PRO MINI

Using Arduino Programming Questions
1

I've problem with connection DS18B20 to PRO MINI ...

I've test sensor at on DUE board and its work at D4 port with no problem ... but i cant find any port to make it work with PRO MINI (ATMEGA328 3.3V 5MHZ) .... with same scatch ... can you help me

DS18B20 (water proved version) got 3 wires VCC GND and DATA WIRE

800×800 44.9 KB

2

Please post the code that you are trying to use with the Pro Mini and a link to the sensor that you are using.

3

//
// FILE: TwoPin_DS18B20.ino
// AUTHOR: Rob Tillaart
// VERSION: 0.1.00
// PURPOSE: two pins for two sensors demo
// DATE: 2014-06-13
// URL: Enumerating DS18B20s on a bus - #22 by robtillaart - Sensors - Arduino Forum
//
// Released to the public domain
//

#include <OneWire.h>
#include <DallasTemperature.h>

#define ONE_WIRE_BUS_1 4
#define ONE_WIRE_BUS_2 10

OneWire oneWire_in(ONE_WIRE_BUS_1);
OneWire oneWire_out(ONE_WIRE_BUS_2);

DallasTemperature sensor_inhouse(&oneWire_in);
DallasTemperature sensor_outhouse(&oneWire_out);

void setup(void)
{
Serial.begin(9600);
Serial.println("Dallas Temperature Control Library Demo - TwoPin_DS18B20");

sensor_inhouse.begin();
sensor_outhouse.begin();
}

void loop(void)
{
Serial.print("Requesting temperatures...");
sensor_inhouse.requestTemperatures();
sensor_outhouse.requestTemperatures();
Serial.println(" done");

Serial.print("Inhouse: ");
Serial.println(sensor_inhouse.getTempCByIndex(0));

Serial.print("Outhouse: ");
Serial.println(sensor_outhouse.getTempCByIndex(0));
}

code from example with dallas library

its now connected to DUE to port D4 and its works

4

At due it works at single port D4 (tested 1-10) ... whats a difference in it...

5

PRO MINI (ATMEGA328 3.3V 5MHZ)

5 MHz?
Try a 750 mS delay after each

requestTemperatures();
6

Did you remember the pull-up resistor?

7

I didnt use resistor at due board and its works well but at just one port D4 ...
I have to use it ?

8

The One-Wire standard requires a pullup resistor. You may get it to "work" without one. But, you're then trying to operate the device contrary to the standard and the manufacture's recommendations. That essentially makes you an unpaid test pilot.

Also, are you trying to use parasite mode? Don't. At least not until you get things straightened out.