How to use Python.

Running Hubo hardware using Python

Hubo hardware can not only be controlled by C++ but other languages too. Python is one of them. Please find below a few examples on how to go on with Python.

MCP23017 - Reading from and writing to Hubo's digital IO.

This demo illustrates how to read from and write to the digital IO.

#!/usr/bin/python

import smbus
import time

# Hubo MCP23017 Demo - simple reading and writing of the MCP23017 digital IO.

IODIRA = 0x00
IODIRB = 0x01
GPPUB  = 0x0D
GPIOA  = 0x12
GPIOB  = 0x13

global g_ioaddress
g_ioaddress = 0x20  # I2C address - Hubo master modules use 0x20

def Initialize_MCP23017 ():
    i2cbus = smbus.SMBus(1)                            # Use 1 for the model B variants, use 0 for Banana Pi.
    i2cbus.write_byte_data (g_ioaddress, IODIRA, 0x00) # Configure port A as output
    i2cbus.write_byte_data (g_ioaddress, IODIRB, 0xFF) # Configure port B as input
    i2cbus.write_byte_data (g_ioaddress, GPPUB,  0xFF) # Activate  port B's internal pull up resistors
    return i2cbus
    
def Get_DI_Channels (i2cbus):
    return i2cbus.read_byte_data(g_ioaddress, GPIOB)

def Set_DI_Channels (i2cbus, value):
    return i2cbus.write_byte_data(g_ioaddress, GPIOA, value)
    
    
# Read values from the digital input port and output the value on the digital output port.
i2cbus = Initialize_MCP23017()
while True:
    value = Get_DI_Channels (i2cbus)
    Set_DI_Channels(i2cbus, value)
    print value
    time.sleep(0.1)

MCP3208 - Reading analog input from Hubo hardware.

The following code reads analog values from the MCP3208's channel 0.

#!/usr/bin/python

import spidev
import time

# Hubo MCP3208 Demo - simple reading of the MCP3208 analog input.

def Open_SPI_ADC ():
    spiADC = spidev.SpiDev()
    spiADC.open(0, 0)
    spiADC.max_speed_hz = (50000)
    return spiADC
    
def Get_AI_Channel (spiADC, channel):
    if ((channel > 7) or (channel < 0)):
        print 'Illegal channel number (0 through 7)'
        return 0.0
    result = spiADC.xfer2([6 + (channel >> 2), channel << 6, 0])
    count = ((result[1] & 0x0F) << 8) + (result[2])
    # Use a reference voltage of 2.53V.
    voltage = (2.53 * count) / 4096
    return voltage
    
# Read 10 values from analog input 0.
spiADC = Open_SPI_ADC()
for i in range(0, 9):
    print Get_AI_Channel (spiADC, 0)
    time.sleep(1)
spiADC.close();