29 votes
Accepted

DS18B20 not listed in /sys/bus/w1/devices

Found it! sudo nano /boot/config.txt add : dtoverlay=w1-gpio this has to do with kernel update, find more info in this link
  • 306
21 votes
Accepted

How much temperature is normal temperature for Raspberry Pi 4

What temperature range is normal or... how hot is too hot? My Pi 4B's with a decent heat management system (I've used several varieties) will typically run in the mid to upper 30°C's to the low-mid 40°...
19 votes

What is the maximum / minimum operational temperature?

It'll go way down to < -70°C according to the article: Raspberry Pi proven to be stable when submerged in liquid nitrogen. UPDATE 29JUN2020: The above link is nolonger working. A similar article ...
  • 465
16 votes
Accepted

Do I need to use a heat sink?

No a heatsink is not required, The Pi3 has been reported to generate more heat than previous models, but the heatsink is not required. You can install it for some extra thermal protection, but the Pi ...
16 votes
Accepted

How to remove thermometer in Raspbian 8 jessie PIXEL

I don't think that should be happening. There is an explanation of the thermometer icon here updated last month, and it says it comes on halfway at 80°C, when the CPU should begin throttling due to ...
  • 56.9k
15 votes

What is the maximum / minimum operational temperature?

My experience with Raspberry Pi 3: The SoC will start to throttle down at approximately 80 degrees Celsius, and will, in my experience, never allow itself to be warmer than 85 degrees Celsius. This is ...
  • 316
15 votes

How to directly get CPU temp in Python?

For those coming here from Google. You can get Raspberry CPU temp in Python using gpiozero package. pip install gpiozero Create your temp.py from gpiozero import CPUTemperature cpu = ...
  • 275
11 votes

Do I need to use a heat sink?

As the answers state, no heatsinks are required. However, following on from Snowman's comment to Maxthon Chan's answer, and taking some examples from the Raspberry Pi site1, should you want to check/...
  • 2,480
11 votes

Is this idle temperature normal for the RPi 3?

I have eight pi3s in a room which is 22-24°C. They range in temperature between ~45°C and ~50°C when idle, with each pi being fairly consistent in temperature +-2°C (sorry, not terribly accurate ...
  • 606
10 votes
Accepted

What are the cooling requirements for Raspberry Pi 3?

More information on this will be available as and when the units start arriving with purchasers and we get a clearer picture of overclocking capabilities and such. To the best of my knowledge the ...
  • 10.6k
9 votes

How do I monitor the temperature ever 3 seconds without entering new commands?

I think using watch command is much easier, for example: watch {your command} In your case, it will be: watch vcgencmd measure_temp That will refresh by 2 seconds, if you want to define the ...
9 votes

What is the maximum / minimum operational temperature?

I see the OP's question has been answered authoritatively, but here are my 2 cents worth of experience: With the basic clear plastic no-fan enclosure and heat sinks the ARM AP runs at about 50C (122F)...
  • 2,228
8 votes

How to directly get CPU temp in Python?

It has already been answered and accepted but I see that no one has brought up this alternative that doesn't depend on running a command but rather on reading from a file: /sys/class/thermal/...
  • 700
7 votes

Does a cool Raspberry Pi 3 run more efficiently?

As discussed here What's the maximum / minimum running temperature? and taken right from the official FAQ: What is the usable temperature range? The Raspberry Pi is built from commercial ...
  • 15.6k
6 votes
Accepted

DS18B20 temperature sensor not registered - debugging?

See related: Firmware 3.18.x breaks I²C, SPI, audio, lirc, 1-wire (e.g. /dev/i2c-1, No such file or directory) Basically, the latest firmware for the Raspberry Pi enables Device Tree, and also ...
  • 1,516
6 votes

Where to put heat sinks on Raspberry Pi?

You put the heatsinks directly on top of the CPU and the Ethernet/USB micro controller. Like this: RPi Heatsinks Usually, 99 times out of 100, you won't need heatsinks.
  • 6,275
6 votes
Accepted

Difference between .../thermal_zone0/temp and .../thermal_zone0/subsystem/thermal_zone0/temp?

lrwxrwxrwx 1 root root 0 2016-02-19 22:24 thermal_zone0 -> ../../devices/virtual/thermal/thermal_zone0 lrwxrwxrwx 1 root root 0 2016-02-25 17:31 /sys/class/thermal/thermal_zone0/subsystem/...
  • 55.5k
6 votes
Accepted

Connecting DS18B20 temperature sensor with RJ45 connector?

Connecting the DS18B20 to the Ethernet port would either not work or the effort to make it work (even if it was possible) would be excessive for someone starting out with a Raspberry Pi. As you state,...
  • 1,836
6 votes

Is this idle temperature normal for the RPi 3?

I have a RPI3 with a mini heatsink, like the following image: Both heat sinks (14x14x11 mm and 9x9x12 mm) are made of aluminium and the fan is a SEPA MF15B-05 (15x15x5mm, 5V-0.06A) that is soldered ...
6 votes
Accepted

What is the maximum temperature a Raspberry Pi 3 can be exposed to?

As noted in the Raspberry Pi FAQ: The Raspberry Pi is built from commercial chips which are qualified to different temperature ranges; the LAN9514 (LAN9512 on older models with 2 USB ports) is ...
  • 6,228
5 votes
Accepted

Monitor temperature in fahrenheit

The default desktop environment (DE) on raspbian is LXDE. If you search online (e.g.) with regard to this issue, you'll find a chorus of crickets -- meaning no one cares that much. If this is very ...
  • 56.9k
5 votes
Accepted

How do I read the GPU temperature in C?

/opt/vc/bin/vcgencmd measure_temp This returns the same thing as reading /sys/class/thermal, i.e., the core temp. Reading the /sys file is preferable programmatically because it is just a sequence ...
  • 56.9k
5 votes

Sensor Question

The DS18B20 is a digital sensor using the Dallas 1-wire protocol. If you just want to get figures to play with you could, as you say, connect an ADC and twiddle a pot. However a simpler, and perhaps ...
  • 68.3k
5 votes
Accepted

How does a Raspberry Pi deal with high temperature?

Yes, as the temperature rises the CPU frequency is lowered to prevent damage. The throttling begins around 82 degree Celsius. You can check the CPU Frequency with the following command: cat /sys/...
5 votes

why jumper wire are small length?

The simple answer is it won't hurt to try anything. Signal loss is a product of resistance, and all conductors have some inherent resistance, which decreases with the wire thickness (gauge) and ...
  • 56.9k
5 votes

How to approximate room temperature in a better way

That's the main problem with the Enviro pHAT, and the SenseHAT for that matter - proximity to the Pi affecting results. You're better off getting a Dallas 1-wire temperature sensor, preferably one ...
  • 4,479
5 votes

Any way to kill an application on high temperature?

The following shell script uses the videocore utility vcgencmd measure_temp to get a line like temp=37.4'C. It then does some string magic to isolate the 37 from that string, which is then compared to ...
  • 1,663
5 votes

Raspberry pi for extreme outside using

I've run several Raspberry Pi's outdoors in my CA garden, which reached 100F on some days. Your project is definitely feasible, but it will take a surprising amount of supporting infrastructure. ...
  • 1,119
5 votes

Does the DS18B20 1-wire temperature sensor ID change with different Raspberry Pi's?

No, the device id does not change, it is hardwired into the DS18B20.
  • 68.3k
5 votes
Accepted

Does the DS18B20 1-wire temperature sensor ID change with different Raspberry Pi's?

Each individual DS18B20 has its own unique ID # assigned at the factory. That device will have the same ID for its entire life and will never change. So if you unplug it from one host computer and ...
  • 479

Only top scored, non community-wiki answers of a minimum length are eligible