Hi Steven. I added I2C support <https://github.com/pharo-iot/PharoThings/releases/tag/v0.2.1> to PharoThings and WiringPi.
Now you can ask the board instance for I2C connection: i2cConnection := board connectToI2CDevice: 4. And then read/write data using wiringpi functions like: i2cConnection readData. i2cConnection read8BitsAt: 16r32 "register". i2cConnection writeData: 16rAB. i2cConnection write8BitsAt: 16r32 "register" data: 16rA5. Also I added I2CDevice as superclass for simple i2c devices. There is example of accelerometer ADXL345. Look for details. Best regards, Denis 2017-12-19 23:20 GMT+01:00 Steven Costiou <steven.cost...@kloum.io>: > 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): > <https://learn.adafruit.com/introducing-trinket/introduction)> > > |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. >> >
