Hi,
I plugged an I2C sensor to my Arduino pro mini but I can't detect it.
It is the TCN75A, it is well powered (4.7V) and the pin are also well wired according to this image.
I'm using I2cScanner to detect any device without success.
What can be the cause of that and how can I troubleshoot it?
I don't have any other I2C sensor to test but this one is completely new, out of the box.
Thanks
Your pictures don't show what pins are connected where on the I2C module and the ones on the pro mini look suspect as I think RAW is an input, there is no GND connection and your maybe powering the module using 3.3V and this can maybe damage the module if it's powered with 3.3V and the SDA/SCL pins are using 5V.
Perhaps your Pro Mini is a clone and they have forgotten to connect A4 or A5 to the chip.
Do you have a multimeter ?
I'm with Riva, you might have forgotten the GND. Can you make a photo of your wiring ?
There is no a schematic for that module ? I don't know of those resistors are pullup resistors for the SDA and SCL.
Koepel:
I don't know of those resistors are pullup resistors for the SDA and SCL.
There appears to be no pullups on the SCL/SDA. The resistors look like pulldowns for the address lines.
Ok thank you for your guidance.
In order to take a picture to share with you, I removed all my other sensor to clean it up a little bit. After that I tested again my setup with only the arduino and my I2C sensor and now the I2C scanner detect my sensor at the address 0x48 !
