Comments on: How to use the DS18S20 and DS18B20 temperature sensors with Arduino http://stuff.nekhbet.ro/2009/08/23/how-to-use-the-ds18s20-and-ds18b20-temperature-sensors-with-arduino.html A website containing DIY projects and programming tips & tricks. Mon, 26 Jul 2010 21:06:49 +0000 hourly 1 http://wordpress.org/?v=abc By: using a DS18B20 temp probe http://stuff.nekhbet.ro/2009/08/23/how-to-use-the-ds18s20-and-ds18b20-temperature-sensors-with-arduino.html/comment-page-1#comment-198108 using a DS18B20 temp probe Fri, 21 May 2010 23:03:50 +0000 http://stuff.nekhbet.ro/?p=254#comment-198108 [...] to this guy How to use the DS18S20 and DS18B20 temperature sensors with Arduino – Dedication to DIY and pr... you only need one resistor per ??? devices. Reply With Quote [...] [...] to this guy How to use the DS18S20 and DS18B20 temperature sensors with Arduino – Dedication to DIY and pr… you only need one resistor per ??? devices. Reply With Quote [...]

]]> By: SimonL http://stuff.nekhbet.ro/2009/08/23/how-to-use-the-ds18s20-and-ds18b20-temperature-sensors-with-arduino.html/comment-page-1#comment-196196 SimonL Tue, 09 Mar 2010 23:28:45 +0000 http://stuff.nekhbet.ro/?p=254#comment-196196 Hi Sorin, Hope the exams went well. Did you get a chance to try it? I confirmed it's not a grounding issue - almost certain it's coding. Regards, Simon. Hi Sorin, Hope the exams went well. Did you get a chance to try it? I confirmed it’s not a grounding issue – almost certain it’s coding.
Regards,
Simon.

]]> By: Ivan http://stuff.nekhbet.ro/2009/08/23/how-to-use-the-ds18s20-and-ds18b20-temperature-sensors-with-arduino.html/comment-page-1#comment-194891 Ivan Sat, 30 Jan 2010 16:22:54 +0000 http://stuff.nekhbet.ro/?p=254#comment-194891 Thanks for this, very helpful in getting up and running with these sensors! Thanks for this, very helpful in getting up and running with these sensors!

]]> By: Trimbitas Sorin http://stuff.nekhbet.ro/2009/08/23/how-to-use-the-ds18s20-and-ds18b20-temperature-sensors-with-arduino.html/comment-page-1#comment-194629 Trimbitas Sorin Wed, 20 Jan 2010 12:45:23 +0000 http://stuff.nekhbet.ro/?p=254#comment-194629 Hi Simon, Try to ground pin 3 as tinux suggested. I'll run some more tests tomorrow because I'm off work :) and will get back and modify the post if it is the case. Best wishes Sorin Hi Simon,

Try to ground pin 3 as tinux suggested. I’ll run some more tests tomorrow because I’m off work :) and will get back and modify the post if it is the case.

Best wishes

Sorin

]]> By: SimonL http://stuff.nekhbet.ro/2009/08/23/how-to-use-the-ds18s20-and-ds18b20-temperature-sensors-with-arduino.html/comment-page-1#comment-194628 SimonL Wed, 20 Jan 2010 12:38:35 +0000 http://stuff.nekhbet.ro/?p=254#comment-194628 Thansk for that - it's great & works a treat. I did however come across an issue - below freezing it doesn't go below -1.25 C. As soon as it hit that, the next reading is -0.31 C. I tried it in the freezer and it kept jumping back up, but less & less frequently as time goes by as it tends towards its final temperature. It's almost as though the integer part of the temperature is wrong. I'm afraid I'm not smart enough to fix it. I graphed it in excel so I can show you what's happening, but can't paste it in here I guess, but can email or whatever to anyone. Thanks, Simon. Thansk for that – it’s great & works a treat.
I did however come across an issue – below freezing it doesn’t go below -1.25 C. As soon as it hit that, the next reading is -0.31 C. I tried it in the freezer and it kept jumping back up, but less & less frequently as time goes by as it tends towards its final temperature. It’s almost as though the integer part of the temperature is wrong. I’m afraid I’m not smart enough to fix it. I graphed it in excel so I can show you what’s happening, but can’t paste it in here I guess, but can email or whatever to anyone.
Thanks, Simon.

]]> By: tinux http://stuff.nekhbet.ro/2009/08/23/how-to-use-the-ds18s20-and-ds18b20-temperature-sensors-with-arduino.html/comment-page-1#comment-194334 tinux Tue, 29 Dec 2009 18:58:41 +0000 http://stuff.nekhbet.ro/?p=254#comment-194334 @ Franklin: Ground pin 3! see http://milesburton.com/index.php?title=Dallas_Temperature_Control_Library#Installation @ Franklin: Ground pin 3! see http://milesburton.com/index.php?title=Dallas_Temperature_Control_Library#Installation

]]> By: Trimbitas Sorin http://stuff.nekhbet.ro/2009/08/23/how-to-use-the-ds18s20-and-ds18b20-temperature-sensors-with-arduino.html/comment-page-1#comment-194315 Trimbitas Sorin Mon, 28 Dec 2009 08:37:30 +0000 http://stuff.nekhbet.ro/?p=254#comment-194315 Hi Andy, Now it should be ok. I'll move the code back into the blog in few days. Sorin Hi Andy,

Now it should be ok. I’ll move the code back into the blog in few days.

Sorin

]]> By: Andrew Davison http://stuff.nekhbet.ro/2009/08/23/how-to-use-the-ds18s20-and-ds18b20-temperature-sensors-with-arduino.html/comment-page-1#comment-194314 Andrew Davison Mon, 28 Dec 2009 08:14:25 +0000 http://stuff.nekhbet.ro/?p=254#comment-194314 Hi Sorin, The tutorial appears to have meen mangled... is there any chance you could put it back up? Thanks heaps for a great resource! Andy Hi Sorin,

The tutorial appears to have meen mangled… is there any chance you could put it back up?

Thanks heaps for a great resource!

Andy

]]> By: Franklin http://stuff.nekhbet.ro/2009/08/23/how-to-use-the-ds18s20-and-ds18b20-temperature-sensors-with-arduino.html/comment-page-1#comment-194200 Franklin Sun, 20 Dec 2009 01:18:41 +0000 http://stuff.nekhbet.ro/?p=254#comment-194200 Hello dear friends. Mi problem is that I can't read temperatures over 52 °C and I put the sensor (ds18b20) very near of a welder!!. The CRC is good. When I energize the circuit the first data is 85°C (LSB=50h, MSB=05h, TH=75, TL=70, CF=127, Reser1=255, Reser2= (change any times from 2 to 16, but many times is only 12), Reser3=16, and CRC= change). And with ice the lowest temperature is 20°C arghhh :-( Is the ds18b20 not working? any idea? Heellpppp!! Franklin Hello dear friends.

Mi problem is that I can’t read temperatures over 52 °C and I put the sensor (ds18b20) very near of a welder!!.
The CRC is good.
When I energize the circuit the first data is 85°C (LSB=50h, MSB=05h, TH=75, TL=70, CF=127, Reser1=255, Reser2= (change any times from 2 to 16, but many times is only 12), Reser3=16, and CRC= change).
And with ice the lowest temperature is 20°C arghhh :-(

Is the ds18b20 not working? any idea?

Heellpppp!!
Franklin

]]> By: Eric http://stuff.nekhbet.ro/2009/08/23/how-to-use-the-ds18s20-and-ds18b20-temperature-sensors-with-arduino.html/comment-page-1#comment-193965 Eric Wed, 09 Dec 2009 16:54:44 +0000 http://stuff.nekhbet.ro/?p=254#comment-193965 Thank you for the example. I was not getting realistic results however and traced it to the getTemperature routine. I do not know why for sure I was getting wildly high temps from your code as is, but this is how I changed it: float getTemperature(byte* address){ int tr; byte data[12]; float temp; writeTimeToScratchpad(address); readTimeFromScratchpad(address,data); //put in temp all the 8 bits of MSB tr = data[1]; //check for negative temperature if (data[1] > 0x80){ tr = !tr + 1; //two's complement adjustment tr = tr * -1; //flip value negative. } temp = tr * 256 + data[0]; //MSB + LSB temp = temp / 16.0; // think this was cpc, but not sure about reading reserved byte return temp; } Thank you for the example. I was not getting realistic results however and traced it to the getTemperature routine. I do not know why for sure I was getting wildly high temps from your code as is, but this is how I changed it:

float getTemperature(byte* address){
int tr;
byte data[12];
float temp;

writeTimeToScratchpad(address);

readTimeFromScratchpad(address,data);

//put in temp all the 8 bits of MSB
tr = data[1];

//check for negative temperature
if (data[1] > 0×80){
tr = !tr + 1; //two’s complement adjustment
tr = tr * -1; //flip value negative.
}

temp = tr * 256 + data[0]; //MSB + LSB
temp = temp / 16.0; // think this was cpc, but not sure about reading reserved byte

return temp;
}

]]> By: Chris http://stuff.nekhbet.ro/2009/08/23/how-to-use-the-ds18s20-and-ds18b20-temperature-sensors-with-arduino.html/comment-page-1#comment-193033 Chris Sun, 15 Nov 2009 05:42:31 +0000 http://stuff.nekhbet.ro/?p=254#comment-193033 Thanks!!! Thanks!!!

]]> By: Trimbitas Sorin http://stuff.nekhbet.ro/2009/08/23/how-to-use-the-ds18s20-and-ds18b20-temperature-sensors-with-arduino.html/comment-page-1#comment-193019 Trimbitas Sorin Sat, 14 Nov 2009 21:08:44 +0000 http://stuff.nekhbet.ro/?p=254#comment-193019 Hi Chris, I fixed the link. It works now :) Thanks Sorin Hi Chris,

I fixed the link. It works now :)

Thanks

Sorin

]]> By: Chris http://stuff.nekhbet.ro/2009/08/23/how-to-use-the-ds18s20-and-ds18b20-temperature-sensors-with-arduino.html/comment-page-1#comment-193018 Chris Sat, 14 Nov 2009 19:09:10 +0000 http://stuff.nekhbet.ro/?p=254#comment-193018 The link on tutorialpedia doesn't appear to work. Is this code posted some place else? Thanks! The link on tutorialpedia doesn’t appear to work. Is this code posted some place else? Thanks!

]]> By: Mach http://stuff.nekhbet.ro/2009/08/23/how-to-use-the-ds18s20-and-ds18b20-temperature-sensors-with-arduino.html/comment-page-1#comment-190772 Mach Tue, 08 Sep 2009 18:39:50 +0000 http://stuff.nekhbet.ro/?p=254#comment-190772 Thank you, this is exactly what needed! Thank you, this is exactly what needed!

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