Raspberry PI 2 Model B Not Detecting ds18b20 Sensor (Tested with Multiple Sensors)

Question

I just wanted to ask some advices. I have tried everything I could find, including :

• /boot/config.txt add Line dtoverlay=w1-gpio,gpiopin=4
• Update and Upgrade
• Updating firmware
• Buying new Sensors.
• Tried Testing GPIO4 (Pin 7)
• sudo modprobe w1-gpio && sudo modprobe w1_therm (always present)

I just cannot seem to get these sensors to pic up at all

I have rechecked my wiring and all seems Fine. was following this (Guide)

I tried testing GPIO4 with an LED and Python.. but I cannot seem to get it to switch state to .HIGH (Possibly Faulty GPIO pin?)/(Locked by Kernel?)

Any Assistance would be appreciated.

Images of Connections

1. Connection to Raspberry Pi GPIOs

   

2. Breadboard Connections and layout

3. Different Angle as to see the Resistors Placement

1. gpiotest Results

Answer 1

This happened to me today, after few hours I found the answer. :)

Add this line to /boot/config.txt:

device_tree=

Then restart the Pi. Hope this will fix for you too.