The VM212 Earth Listener kit uses a sensor shield VMA212 according to the VM211 assembly instructions.
To add a realtime clock I want to look at the doc for the VMA212. But I cannot find it on velleman.eu.
The VMA212 will be available for purchase soon, together with the documents.
Have a look at this infosheet of the VMA212 for the required information.
Basicly, this shield provides easy access to the analog pins A11, A12, A13, A14, A15 and interrupt pins 18 & 19 who are connected (like the I2C pins 20 SDA and 21 SCL) via the logic convertor.
We do this because the Arduino Mega board’s I2C bus is 5V, but the sensors are 3.3V.
Kind regards,
VEL342
Thank you.
It’s good to have a link to the datasheet.
Bert