(very simple) Example for UniPi direct via PIGPIO

it5l

Hi all,

I am experimenting with the UniPi and I have to say, it is indeed very easy with the evok-api.
Within minutes was the board installed, the evok-api build and the webinterface running!

One small comment about the install script:
use with the "sudo apt-get" and the "sudo pip" the -E option of sudo. This way the script also
will work in a network with a proxy. (if the proxy env is set of course)

But I need a little help with my next experiment:
I want to "skip" the evok-api and try to use python and the PIGPIO lib to read the input
and switch the relay direct. I keep using the PIGPIO Deamon which came wit the install.
And also I import the pigpio.py which came with the evok-api.

My bigest problem is that I do not fuly understand the I2C Bus principals with the UniPi
And that the evok-api is compleetly open, is fantastic! But I could not extract the complete
code for a very simple proof of concept.

So can somebody help me and post a minimal block of code for reading a Digital Input
and switch one of the relays ?

import pigpio
import time

def main():
   i2cbus = 1
   address = 0x20

   pi = pigpio.pi()
   handle = pi.i2c_open(i2cbus, address, 0)

   > and here I get stock <

   pi.i2c_close(handle)
   pi.stop()

if __name__ == '__main__':
    main()

it5l

Hi all,

I am experimenting with the UniPi and I have to say, it is indeed very easy with the evok-api.
Within minutes was the board installed, the evok-api build and the webinterface running!

One small comment about the install script:
use with the "sudo apt-get" and the "sudo pip" the -E option of sudo. This way the script also
will work in a network with a proxy. (if the proxy env is set of course)

But I need a little help with my next experiment:
I want to "skip" the evok-api and try to use python and the PIGPIO lib to read the input
and switch the relay direct. I keep using the PIGPIO Deamon which came wit the install.
And also I import the pigpio.py which came with the evok-api.

My bigest problem is that I do not fuly understand the I2C Bus principals with the UniPi
And that the evok-api is compleetly open, is fantastic! But I could not extract the complete
code for a very simple proof of concept.

So can somebody help me and post a minimal block of code for reading a Digital Input
and switch one of the relays ?

import pigpio
import time

def main():
   i2cbus = 1
   address = 0x20

   pi = pigpio.pi()
   handle = pi.i2c_open(i2cbus, address, 0)

   > and here I get stock <

   pi.i2c_close(handle)
   pi.stop()

if __name__ == '__main__':
    main()

it5l

A new day, a big cup of coffee and a smart collega (mh)…
...and we solved one part of the question:

import pigpio
import time

def main():
    i2cbus = 1
    address = 0x20

    pi = pigpio.pi()
    handle = pi.i2c_open(i2cbus, address, 0)
    print('status: ' + str(pi.i2c_read_byte_data(handle, 9)))

    pi.i2c_write_byte_data(handle, 9, 0)
    print('status: ' + str(pi.i2c_read_byte_data(handle, 9)))
    time.sleep(2)

    pi.i2c_write_byte_data(handle, 9, 15)
    print('status: ' + str(pi.i2c_read_byte_data(handle, 9)))
    time.sleep(2)

    pi.i2c_write_byte_data(handle, 9, 255)
    print('status: ' + str(pi.i2c_read_byte_data(handle, 9)))
    time.sleep(2)

    pi.i2c_write_byte_data(handle, 9, 0)
    print('status: ' + str(pi.i2c_read_byte_data(handle, 9)))

    pi.i2c_close(handle)
    pi.stop()

if __name__ == '__main__':
    main()

Any comments ?
Please reply!

Hello,

nice job.

The digital input is not difficult once you have this done. Just do not forget to set the PULL-UP resistor on each GPIO - the list of the GPIOs can be found in the documentation.

See unipig.py file line 646

Keep me updated with your progress