write /dev/i2c-1: connection timed out

[TuringZhu]

Hello, I a beginner gobot & raspberry pi.

Now I use examples/raspi_grove_pi_ultrasonic.go to check with Raspberry Pi Model B and ultrasonic model with HC-SR04.

I have some problems can not be solved.

HC-SR04 has 4 Pin with VCC,GND,Trig_RX-SCL_I/O, ECHO_DX_SDA but the code just defined ultrasonicPin = "4", so how can I connect
my raspberry pi with HC-SR04

and no matter what pin i connect the code always output write /dev/i2c-1: connection timed out. I want to know why.

in addition, I hope to have a website or other chat groups can get other developer's help quickly. I would be extremely grateful.

[gen2thomas]

Hello @TuringZhu ,

do you have really an I2C ultrasonic Model with the name HC-SR04? Normally this is an analog one. Please try to use this example instead:
https://github.com/hybridgroup/gobot/blob/release/examples/raspi_hcsr04.go

Good luck, Thomas