DS18B20 does not have a unique adress in /sys/bus/w1/devices

Question

The problem:

I am trying to use a RW1820 (DS18B20), to display the temperature. yet it does not show up in devices. Only w1_bus_master 1 appears.

Setup:

Raspberry Pi 4
1-Wire Temperature Sensor Module – RW1820 (DS18B20)

Wiresetup:

Ground to pin 9 (pin 6 is in use due to a cooling fan)
Data to Gpio4 (pin 7)
VCC to pin 2

Steps I took:

I found this question by someone who had the same issue but the solution I had already configured correctly. (DS18B20 not listed in /sys/bus/w1/devices)

Things I tried:

Connected the DS18b20 to my Arduino, sensor worked.
Used the same cables I used with the arduino for connecting to the Rpi, cables are okay.
Tried using the sensor on 3.3v, no effect
Inside the config.txt, I cut and pasted dtoverlay=w1-gpio on multiple lines (made sure only one was uncommented), no effect.

Photos:

Config content:

# For more options and information see
# http://rpf.io/configtxt
# Some settings may impact device functionality. See link above for details
uncomment if you get no picture on HDMI for a default "safe" mode
#hdmi_safe=1
uncomment this if your display has a black border of unused pixels visible
and your display can output without overscan
#disable_overscan=1
uncomment the following to adjust overscan. Use positive numbers if console
goes off screen, and negative if there is too much border
#overscan_left=16
#overscan_right=16
#overscan_top=16
#overscan_bottom=16
uncomment to force a console size. By default it will be display's size minus
overscan.
#framebuffer_width=1280
#framebuffer_height=720
uncomment if hdmi display is not detected and composite is being output
#hdmi_force_hotplug=1
uncomment to force a specific HDMI mode (this will force VGA)
#hdmi_group=1
#hdmi_mode=1
uncomment to force a HDMI mode rather than DVI. This can make audio work in
DMT (computer monitor) modes
#hdmi_drive=2
uncomment to increase signal to HDMI, if you have interference, blanking, or
no display
#config_hdmi_boost=4
uncomment for composite PAL
#sdtv_mode=2
#uncomment to overclock the arm. 700 MHz is the default.
#arm_freq=800
Uncomment some or all of these to enable the optional hardware interfaces
#dtparam=i2c_arm=on
#dtparam=i2s=on
#dtparam=spi=on
Uncomment this to enable infrared communication.
#dtoverlay=gpio-ir,gpio_pin=17
#dtoverlay=gpio-ir-tx,gpio_pin=18
Additional overlays and parameters are documented /boot/overlays/README
Enable audio (loads snd_bcm2835)
dtparam=audio=on
[pi4]
Enable DRM VC4 V3D driver on top of the dispmanx display stack
dtoverlay=vc4-fkms-v3d
max_framebuffers=2
[all]
#dtoverlay=vc4-fkms-v3d
dtoverlay=w1-gpio

Who has any idea what is going wrong? Could one of my GPIO pins be broken?

We need a clear photo showing the connections between the sensor and the Pi. We also need to see the contents of /boot/config.txt. — joan, Aug 11 '20 at 14:21
This might help: https://raspberrypi.stackexchange.com/questions/100203/ds18b20-temperature-sensor-rpi-3-4-driver-wiring-detection-and-python-progr. — tlfong01, Aug 11 '20 at 14:45
I presume G (brown) is ground, R (red) is data, and Y (orange) is +ve. Is that what you have? — joan, Aug 11 '20 at 15:40
Afaik you need to add a proper pull-up resistor for the data line or alternatively connect the sensor for parasitic power. — onion, Aug 24 '20 at 11:39
Could you elaborate a bit? I have seen schematics with a 4.7 kOmh resistor but this board already has its built in Resistor and works without an additional resistor on my arduinos — Anton van der Wel, Aug 24 '20 at 11:45

DS18B20 does not have a unique adress in /sys/bus/w1/devices

uncomment if you get no picture on HDMI for a default "safe" mode

uncomment this if your display has a black border of unused pixels visible

and your display can output without overscan

uncomment the following to adjust overscan. Use positive numbers if console

goes off screen, and negative if there is too much border

uncomment to force a console size. By default it will be display's size minus

overscan.

uncomment if hdmi display is not detected and composite is being output

uncomment to force a specific HDMI mode (this will force VGA)

uncomment to force a HDMI mode rather than DVI. This can make audio work in

DMT (computer monitor) modes

uncomment to increase signal to HDMI, if you have interference, blanking, or

no display

uncomment for composite PAL

Uncomment some or all of these to enable the optional hardware interfaces

Uncomment this to enable infrared communication.

Additional overlays and parameters are documented /boot/overlays/README

Enable audio (loads snd_bcm2835)

Enable DRM VC4 V3D driver on top of the dispmanx display stack

0 Answers0