On 18.2.18 20:07, Gordon Henderson wrote:
> In article ,
>    wrote:
>> I have tried different tutorials and forums where people had same/similar
issues with i2c but still, I can't
>> solve this problem.
>>
>> I tried two different BMP180 Digital Barometric Pressure Sensor modules and
even IIC/12C/TWI 1602 Serial LCD module
>>
>> None of them showed up on the i2c detect -y 1
>>
>> I have Raspberry PI 3 B and the following versions and Raspbian GNU/Linux 9
(stretch)
>>
>> https://forums.adafruit.com/download/file.php?id=55367
>
> Check power on the sensor board itself with your multimeter. Then
> (assuming that's all OK at 3.3v) check the SCL and SDA wires - swap
> them over - it won't hurt anything, but it's easy to get these the wrong
> way round.
>
> Try one device at a time too.
>
> Gordon
>

It may also be that the necessary pull-up resistors are
missing from SDA, SCL or both.

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-TV

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