Hello, You mean to connect the ground of the external power supply (8-12 V DC) which power the Radar module, to one of the Pi GPIO Ground pin (for exemple GPIO pin #9) ? This will put the both system (external power supply ground and GPIO ground) to the same level ? there is no problem ? Best regard...

Hello, I want to interface small "Radar motion detector" with Raspberry Pi GPIO input. The hardware interface is : Pin / Colour / Description / Function 1 / Black / GND / Ground, Reference potential 2 / Brown / OUT / Open Collector output 4 / Red / VCC / Operating voltage 8 ... 15V Documentation wri...

The solution was:
To have simultaneously the following settings:
In /boot/config.txt:
dtparam=i2c1=on
dtparam=i2c_arm=on

Hello,
Yes I have already done it. Thanks.

Hello,
I developp in c++ with netbeans on Windows 7 pro as cross tool chain to the Raspberry.
My program is compiled and linked. I succeed to execute it on Raspberry terminal. But from Netbeans and gdb, only a "program stop cause sigkill" occurs. Some ideas ?
Best regards

Hello, I'am trying to drive servo motor through Adafruit 16-Channel 12-bit PWM/Servo Driver - I2C interface - PCA9685 board. The power added on this board is 4 electric battery 1,5 v. But full voltage is around 4.9 v. I can't access I2C device when i run "ls /dev/i2c*" : i2c is activated, blacklist ...