I am trying to communicate my raspberry pi 3 model b with a GPS / GPRS SIM 808 module (808 EVB-V3.2 SIM). I want to use for this I2C ports, which are already enabled on my raspberry. However, raspberry does not detect the SIM808 when I connect the SDA, SCL and GND pins when I run the sudo i2cdetect-y 1 command (it does not display anything).
The connection I made is as follows:
Raspberry ____ SIM808
SDA (pin 3) ----> SDA (pin 38)
SCL (pin 5) ----> SCL (pin 39)
GND ----> GND
So, should I enable these pins on the SIM808 before connecting it to my raspberry? I have not found information about it, nor AT commands to configure the I2C pins, then I do not know why my raspberry does not recognize it.
Or should I connect another additional pin to establish the connection?
Any information about it will be very helpful.
Raspberry model: http://pi4j.com/pins/model-3b-rev1.html
SIM 808 model: https://cdn-shop.adafruit.com/datasheet ... _V1.00.pdf