I finally bought 2 of those chips, and it works very well.

A simple file read from Pharo and i get my analog values (although i don't understand them, but that has nothing to do with the reading). It is very, very fast.

Thanks again :)

Steven.

Le 2017-12-20 05:20, K K Subbu a écrit :

On Wednesday 20 December 2017 03:50 AM, Steven Costiou wrote:

So connecting an Arduino-like device to the raspberry that is
configured as an i2c slave, Pharo can ask for analog values. I will
try tomorrow with analog sensors, I will share if i manage to build
nice examples.

Seems to be even easier using a special chip: https://learn.adafruit.com/reading-a-analog-in-and-controlling-audio-volume-with-the-raspberry-pi?view=all

An Arduino would be an overkill. Also, there is no need for bitbanging. MCP3008 is are directly supported by the IIO subsystem and its channel data is demuxed in /sys/bus/iio/devices/iio:device<n>

http://www.jumpnowtek.com/rpi/Using-mcp3008-ADCs-with-Raspberry-Pis.html

HTH .. Subbu