I2C Sensor + UniPi analog output

baue

Hello,

we connected an Sensirion sensor to the I2C RJ-11 on the UniPi (I2C Port)
with python:

https://pypi.python.org/pypi/sht-sensor/15.01.5

Test Python driver tool sht-sensor-16.1.0

cd /home/pi/Arbeitspapiere/Nebelsensor/GPIO

sudo python sht-sensor-test_01.py

from sht_sensor import Sht
sht = Sht(3, 2)
print 'Temperature', sht.read_t()
print 'Relative Humidity', sht.read_rh()

It works fine!
Also the evok API with JsonRPC works good

Python using JsonRPC

control the UniPi usint Python library jsonrpclib

JSON = Java Script Object Notation

RPC = Remote Procedure Call

from jsonrpclib import Server

UniPi server

s=Server("http://10.10.10.41/rpc")

s.ao_set_value(1,5) # set analog output 1 of 5 V
s.ai_get(1) # analog input 1 recall voltage
u = s.ai_get(1) # array analog input 1
u[0] # array element 0 -> voltage

but together it is not possible set and recall the ports on UniPi if we make an Sensor recall before.
Is there any solution?

Thank you!
With best regards
Ulf B.

baue

Hello,

we connected an Sensirion sensor to the I2C RJ-11 on the UniPi (I2C Port)
with python:

https://pypi.python.org/pypi/sht-sensor/15.01.5

Test Python driver tool sht-sensor-16.1.0

cd /home/pi/Arbeitspapiere/Nebelsensor/GPIO

sudo python sht-sensor-test_01.py

from sht_sensor import Sht
sht = Sht(3, 2)
print 'Temperature', sht.read_t()
print 'Relative Humidity', sht.read_rh()

It works fine!
Also the evok API with JsonRPC works good

Python using JsonRPC

control the UniPi usint Python library jsonrpclib

JSON = Java Script Object Notation

RPC = Remote Procedure Call

from jsonrpclib import Server

UniPi server

s=Server("http://10.10.10.41/rpc")

s.ao_set_value(1,5) # set analog output 1 of 5 V
s.ai_get(1) # analog input 1 recall voltage
u = s.ai_get(1) # array analog input 1
u[0] # array element 0 -> voltage

but together it is not possible set and recall the ports on UniPi if we make an Sensor recall before.
Is there any solution?

Thank you!
With best regards
Ulf B.

Any progress? Most probably it is cuased because two applications are trying to acess the i2c bus… You should choose only one.

baue

I tested enabling the I2C interface on the raspberryPi

sudo raspi -config
"8 Advanced Option"
"A7I2C"
ok ..
reboot
analog to
http://www.raspberrypi-spy.co.uk/2014/1 ... pberry-pi/

after these steps
UniPi Webserver -UnPi conntrol panel- "http://adress/"
dont show the "Relays" and "Analog"

It is possible that the EEPROM is defect?

The eeprom is now only used to detect version of UniPi, see the output of i2cdetect -y 1 and maks sure that 0x20 and 0x68 are visible

baue

Hallo,
after new installation of evok the 'i2cdetect -y 1' find the 0x20 and 0x68.
After calling the sensor from python library 'sht-sensor 15.01.5'
sudo sht 3 2
the 'i2cdetect -y 1' don't find the 0x20 and 0x68
Is it possible that two library's for the gpio are used
'PIGPIO' and 'GPIO' and is that the problem?

Thanks!

That's what I wrote in my first reply