I want to output voltage from each one from one script. I want to edit MCP4725.py which is Adafruit_MCP4725 folder. When I edit this file this error showed up [errno 13] permission denied.
This file I want to edit. Can it be edited. have a look at Default 12c address........
Code: Select all
import logging
# Register values:
WRITEDAC = 0x40
WRITEDACEEPROM = 0x60
# Default I2C address:
DEFAULT_ADDRESS = 0x62 [color=#0040BF]### I can write 0x63 also with it like. DEFAULT_ADDRESS =[0x62,0x63][/color]
logger = logging.getLogger(__name__)
class MCP4725(object):
"""Base functionality for MCP4725 digital to analog converter."""
def __init__(self, address=DEFAULT_ADDRESS, i2c=None, **kwargs):
"""Create an instance of the MCP4725 DAC."""
if i2c is None:
import Adafruit_GPIO.I2C as I2C
i2c = I2C
self._device = i2c.get_i2c_device(address, **kwargs)
def set_voltage(self, value, persist=False):
"""Set the output voltage to specified value. Value is a 12-bit number
(0-4095) that is used to calculate the output voltage from:
Vout = (VDD*value)/4096
I.e. the output voltage is the VDD reference scaled by value/4096.
If persist is true it will save the voltage value in EEPROM so it
continues after reset (default is false, no persistence).
"""
# Clamp value to an unsigned 12-bit value.
if value > 4095:
value = 4095
if value < 0:
value = 0
logging.debug('Setting value to {0:04}'.format(value))
# Generate the register bytes and send them.
# See datasheet figure 6-2:
# https://www.adafruit.com/datasheets/mcp4725.pdf
reg_data = [(value >> 4) & 0xFF, (value << 4) & 0xFF]
if persist:
self._device.writeList(WRITEDACEEPROM, reg_data)
else:
self._device.writeList(WRITEDAC, reg_data)