hi,
i've tried i2c and added ffi calls in WiringPiLibrary.
WIRINGPII2CSETUP: DEVID
^self ffiCall: #(int wiringPiI2CSetup (int devId) )
READI2C: FD
^self ffiCall: #(int wiringPiI2CRead (int fd))
Then the following script is able to read a byte from a connected device
(i tried with a trinket
https://learn.adafruit.com/introducing-trinket/introduction): [1]
|lib addr val|
lib := WiringPiLibrary uniqueInstance.
addr := self wiringPiSetupI2C: 4. _"Setup the i2c to the 0x04 address"_
val := self readI2C: addr. _"Read a byte from the i2c address"_
val inspect
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
but it uses more pins on the board.
Steven.
Le 2017-12-17 19:48, Denis Kudriashov a écrit :
> Hi Steven
>
> 2017-12-17 12:40 GMT+01:00 Steven Costiou <steven.cost...@kloum.io>:
>
>> Hi,
>>
>> For what i know, raspberry pi boards cannot read analog sensors (which are
>> the most interesting imo), except by connecting to some kind of bridges or
>> to Arduino boards.
>>
>> In the PharoTHings code i see that there are Arduino classes, and also it is
>> based on wiringpi and wiringpi provides support for i2c which is needed to
>> connect to an Arduino and perform analog reads.
>>
>> I'm exploring the wiringpi doc to see if there is an example for that, but
>> in the meantime, would someone already have an example of analog reads with
>> PharoThings, with working code (even simple) ?
>
> It is in my todo. I need to build example with temperature sensor. I will
> continue work on it next year.
> Now feel free to contribute to the project.
>
> About Arduino: it is not finished. Problem that I use Mac but serial port is
> not working there (it is required for Firmata)
>
>> Steven.
Links:
------
[1] https://learn.adafruit.com/introducing-trinket/introduction)
