python : mon compilateur ne reconnait pas une fonction

**docEmmettBrown** · 14/05/2015, 19h38

bonjour a tous,

voila mon programme en gros :

Code:

class ADS:
          __init_(var):
                    code[...]

while True:
          __init_(var)

mais mon terminal me renvoie :
NameError: name '__init_' is not defined

je pense que le probleme vient que ma fonction est dans une classe mais comment resoudre le probeme

merci d'avance

invite43901482 · 14/05/2015, 20h47

__init_ n'est pas une fonction, c'est rien d'ailleurs ! En python une fonction commence par le mot clé def ...

Je pense que tu voulais faire quelque chose de ce genre

Code:

class ADS:
    def __init__(self, var):
        # ajout des attributs de la classe ADS

Bref, niveau syntaxique, on n'est pas du tout bon ! Va falloir revoir les tutoriels python

**docEmmettBrown** · 14/05/2015, 21h04

mince !!
oui je précise que dans mon code il y a bien le def, j'ai mal recopié dsl.

as tu une solution du fait que mon compilateur n'accepte pas ma fonction?

invite43901482 · 14/05/2015, 22h18

Eh bien regarde mon code et le tiens et regarde la différence ! et surtout le nombre de tiret du 8 aux extrémités du init

A voir en vidéo sur Futura · Aujourd'hui

**docEmmettBrown** · 14/05/2015, 22h48

ok, j'ai donc mi :

Code:

class ADS:
          def __init__(var):
                    code[...]

while True:
          __init__(var)

mais ca me met tjs " NameError: name '__init_' is not defined "

invite43901482 · 15/05/2015, 08h48

Houlà, dis nous ce que tu souhaites faire, car je ne vois vraiment ce que cette boucle infinie while True fait là !

Aussi ton erreur '__init_' prouve que tu n'as pas mis 2 tirets du huit aux extrémités du __init__, mais deux à sa gauche et un seul à sa droite, il faut être rigoureux !

Il ne faudra pas oublier le self, en paramètre de la méthode __init__, qui représente l'instance de la classe ADS

**docEmmettBrown** · 15/05/2015, 13h58

Ok voila j'ai acheté un convertisseur analogie numérique et pour le faire fonctionner on me propose une bibliotheque deja toute faite, le probleme et que je n'arrive pas a la faire fonctionner

voici le code complet :

Code:

#!/usr/bin/python
import re
import smbus
import Adafruit_I2C
import time
# ===========================================================================
# ADS1x15 Class
#
# Originally written by K. Townsend, Adafruit (https://github.com/adafruit/Adafruit-Raspberry-Pi-Python-Code/tree/master/Adafruit_ADS1x15)
# Updates and new functions implementation by Pedro Villanueva, 03/2013.
# The only error in the original code was in line 57:
#              __ADS1015_REG_CONFIG_DR_920SPS    = 0x0050
# should be 
#              __ADS1015_REG_CONFIG_DR_920SPS    = 0x0060     
#
# NOT IMPLEMENTED: Conversion ready pin, page 15 datasheet.
# ===========================================================================

class ADS1x15:
	i2c = None

  # IC Identifiers
	__IC_ADS1015                      = 0x00
	__IC_ADS1115                      = 0x01

  # Pointer Register
	__ADS1015_REG_POINTER_MASK        = 0x03
	__ADS1015_REG_POINTER_CONVERT     = 0x00
	__ADS1015_REG_POINTER_CONFIG      = 0x01
	__ADS1015_REG_POINTER_LOWTHRESH   = 0x02
	__ADS1015_REG_POINTER_HITHRESH    = 0x03

  # Config Register
	__ADS1015_REG_CONFIG_OS_MASK      = 0x8000
	__ADS1015_REG_CONFIG_OS_SINGLE    = 0x8000  # Write: Set to start a single-conversion
	__ADS1015_REG_CONFIG_OS_BUSY      = 0x0000  # Read: Bit = 0 when conversion is in progress
	__ADS1015_REG_CONFIG_OS_NOTBUSY   = 0x8000  # Read: Bit = 1 when device is not performing a conversion

	__ADS1015_REG_CONFIG_MUX_MASK     = 0x7000
	__ADS1015_REG_CONFIG_MUX_DIFF_0_1 = 0x0000  # Differential P = AIN0, N = AIN1 (default)
	__ADS1015_REG_CONFIG_MUX_DIFF_0_3 = 0x1000  # Differential P = AIN0, N = AIN3
	__ADS1015_REG_CONFIG_MUX_DIFF_1_3 = 0x2000  # Differential P = AIN1, N = AIN3
	__ADS1015_REG_CONFIG_MUX_DIFF_2_3 = 0x3000  # Differential P = AIN2, N = AIN3
	__ADS1015_REG_CONFIG_MUX_SINGLE_0 = 0x4000  # Single-ended AIN0
	__ADS1015_REG_CONFIG_MUX_SINGLE_1 = 0x5000  # Single-ended AIN1
	__ADS1015_REG_CONFIG_MUX_SINGLE_2 = 0x6000  # Single-ended AIN2
	__ADS1015_REG_CONFIG_MUX_SINGLE_3 = 0x7000  # Single-ended AIN3

	__ADS1015_REG_CONFIG_PGA_MASK     = 0x0E00
	__ADS1015_REG_CONFIG_PGA_6_144V   = 0x0000  # +/-6.144V range
	__ADS1015_REG_CONFIG_PGA_4_096V   = 0x0200  # +/-4.096V range
	__ADS1015_REG_CONFIG_PGA_2_048V   = 0x0400  # +/-2.048V range (default)
	__ADS1015_REG_CONFIG_PGA_1_024V   = 0x0600  # +/-1.024V range
	__ADS1015_REG_CONFIG_PGA_0_512V   = 0x0800  # +/-0.512V range
	__ADS1015_REG_CONFIG_PGA_0_256V   = 0x0A00  # +/-0.256V range

	__ADS1015_REG_CONFIG_MODE_MASK    = 0x0100
	__ADS1015_REG_CONFIG_MODE_CONTIN  = 0x0000  # Continuous conversion mode
	__ADS1015_REG_CONFIG_MODE_SINGLE  = 0x0100  # Power-down single-shot mode (default)

	__ADS1015_REG_CONFIG_DR_MASK      = 0x00E0  
	__ADS1015_REG_CONFIG_DR_128SPS    = 0x0000  # 128 samples per second
	__ADS1015_REG_CONFIG_DR_250SPS    = 0x0020  # 250 samples per second
	__ADS1015_REG_CONFIG_DR_490SPS    = 0x0040  # 490 samples per second
	__ADS1015_REG_CONFIG_DR_920SPS    = 0x0060  # 920 samples per second
	__ADS1015_REG_CONFIG_DR_1600SPS   = 0x0080  # 1600 samples per second (default)
	__ADS1015_REG_CONFIG_DR_2400SPS   = 0x00A0  # 2400 samples per second
	__ADS1015_REG_CONFIG_DR_3300SPS   = 0x00C0  # 3300 samples per second (also 0x00E0)

	__ADS1115_REG_CONFIG_DR_8SPS      = 0x0000  # 8 samples per second
	__ADS1115_REG_CONFIG_DR_16SPS     = 0x0020  # 16 samples per second
	__ADS1115_REG_CONFIG_DR_32SPS     = 0x0040  # 32 samples per second
	__ADS1115_REG_CONFIG_DR_64SPS     = 0x0060  # 64 samples per second
	__ADS1115_REG_CONFIG_DR_128SPS    = 0x0080  # 128 samples per second
	__ADS1115_REG_CONFIG_DR_250SPS    = 0x00A0  # 250 samples per second (default)
	__ADS1115_REG_CONFIG_DR_475SPS    = 0x00C0  # 475 samples per second
	__ADS1115_REG_CONFIG_DR_860SPS    = 0x00E0  # 860 samples per second

	__ADS1015_REG_CONFIG_CMODE_MASK   = 0x0010
	__ADS1015_REG_CONFIG_CMODE_TRAD   = 0x0000  # Traditional comparator with hysteresis (default)
	__ADS1015_REG_CONFIG_CMODE_WINDOW = 0x0010  # Window comparator

	__ADS1015_REG_CONFIG_CPOL_MASK    = 0x0008
	__ADS1015_REG_CONFIG_CPOL_ACTVLOW = 0x0000  # ALERT/RDY pin is low when active (default)
	__ADS1015_REG_CONFIG_CPOL_ACTVHI  = 0x0008  # ALERT/RDY pin is high when active

	__ADS1015_REG_CONFIG_CLAT_MASK    = 0x0004  # Determines if ALERT/RDY pin latches once asserted
	__ADS1015_REG_CONFIG_CLAT_NONLAT  = 0x0000  # Non-latching comparator (default)
	__ADS1015_REG_CONFIG_CLAT_LATCH   = 0x0004  # Latching comparator

	__ADS1015_REG_CONFIG_CQUE_MASK    = 0x0003
	__ADS1015_REG_CONFIG_CQUE_1CONV   = 0x0000  # Assert ALERT/RDY after one conversions
	__ADS1015_REG_CONFIG_CQUE_2CONV   = 0x0001  # Assert ALERT/RDY after two conversions
	__ADS1015_REG_CONFIG_CQUE_4CONV   = 0x0002  # Assert ALERT/RDY after four conversions
	__ADS1015_REG_CONFIG_CQUE_NONE    = 0x0003  # Disable the comparator and put ALERT/RDY in high state (default)
  
  
  # Dictionaries with the sampling speed values
  # These simplify and clean the code (avoid the abuse of if/elif/else clauses)
	spsADS1115 = {
	8:__ADS1115_REG_CONFIG_DR_8SPS,
	16:__ADS1115_REG_CONFIG_DR_16SPS,
	32:__ADS1115_REG_CONFIG_DR_32SPS,
	64:__ADS1115_REG_CONFIG_DR_64SPS,
	128:__ADS1115_REG_CONFIG_DR_128SPS,
	250:__ADS1115_REG_CONFIG_DR_250SPS,
	475:__ADS1115_REG_CONFIG_DR_475SPS,
	860:__ADS1115_REG_CONFIG_DR_860SPS
	}    
	spsADS1015 = {
	128:__ADS1015_REG_CONFIG_DR_128SPS,
	250:__ADS1015_REG_CONFIG_DR_250SPS,
	490:__ADS1015_REG_CONFIG_DR_490SPS,
	920:__ADS1015_REG_CONFIG_DR_920SPS,
	1600:__ADS1015_REG_CONFIG_DR_1600SPS,
	2400:__ADS1015_REG_CONFIG_DR_2400SPS,
	3300:__ADS1015_REG_CONFIG_DR_3300SPS
	}
  # Dictionariy with the programable gains
	pgaADS1x15 = {
	6144:__ADS1015_REG_CONFIG_PGA_6_144V,
	4096:__ADS1015_REG_CONFIG_PGA_4_096V,
	2048:__ADS1015_REG_CONFIG_PGA_2_048V,
	1024:__ADS1015_REG_CONFIG_PGA_1_024V,
	512:__ADS1015_REG_CONFIG_PGA_0_512V,
	256:__ADS1015_REG_CONFIG_PGA_0_256V
	}    
  


  # Constructor
	def __init__(self, address=0x48, ic=__IC_ADS1115, debug=False):
    # Depending on if you have an old or a new Raspberry Pi, you
    # may need to change the I2C bus.  Older Pis use SMBus 0,
    # whereas new Pis use SMBus 1.  If you see an error like:
    # 'Error accessing 0x48: Check your I2C address '
    # change the SMBus number in the initializer below!
		self.i2c = Adafruit_I2C(address)
		self.address = address
		self.debug = debug

    # Make sure the IC specified is valid
		if ((ic < self.__IC_ADS1015) | (ic > self.__IC_ADS1115)):
			if (self.debug):
				print "ADS1x15: Invalid IC specfied: %h" % ic
			return -1
		else:
			self.ic = ic
        
    # Set pga value, so that getLastConversionResult() can use it,
    # any function that accepts a pga value must update this.
		self.pga = 6144    
  
    
	def readADCSingleEnded(self, channel=0, pga=6144, sps=250):
		"Gets a single-ended ADC reading from the specified channel in mV. \
		The sample rate for this mode (single-shot) can be used to lower the noise \
		(low sps) or to lower the power consumption (high sps) by duty cycling, \
		see datasheet page 14 for more info. \
		The pga must be given in mV, see page 13 for the supported values."
    
    # With invalid channel return -1
		if (channel > 3):
			if (self.debug):
				print "ADS1x15: Invalid channel specified: %d" % channel
			return -1
    
    # Disable comparator, Non-latching, Alert/Rdy active low
    # traditional comparator, single-shot mode
		config = self.__ADS1015_REG_CONFIG_CQUE_NONE    | \
				self.__ADS1015_REG_CONFIG_CLAT_NONLAT  | \
				self.__ADS1015_REG_CONFIG_CPOL_ACTVLOW | \
				self.__ADS1015_REG_CONFIG_CMODE_TRAD   | \
				self.__ADS1015_REG_CONFIG_MODE_SINGLE    

    # Set sample per seconds, defaults to 250sps
    # If sps is in the dictionary (defined in init) it returns the value of the constant
    # othewise it returns the value for 250sps. This saves a lot of if/elif/else code!
		if (self.ic == self.__IC_ADS1015):
			config |= self.spsADS1015.setdefault(sps, self.__ADS1015_REG_CONFIG_DR_1600SPS)
		else:
			if ( (sps not in self.spsADS1115) & self.debug):
				print "ADS1x15: Invalid pga specified: %d, using 6144mV" % sps     
			config |= self.spsADS1115.setdefault(sps, self.__ADS1115_REG_CONFIG_DR_250SPS)

    # Set PGA/voltage range, defaults to +-6.144V
		if ( (pga not in self.pgaADS1x15) & self.debug):	  
			print "ADS1x15: Invalid pga specified: %d, using 6144mV" % sps     
		config |= self.pgaADS1x15.setdefault(pga, self.__ADS1015_REG_CONFIG_PGA_6_144V)
		self.pga = pga

    # Set the channel to be converted
		if channel == 3:
			config |= self.__ADS1015_REG_CONFIG_MUX_SINGLE_3
		elif channel == 2:
			config |= self.__ADS1015_REG_CONFIG_MUX_SINGLE_2
		elif channel == 1:
			config |= self.__ADS1015_REG_CONFIG_MUX_SINGLE_1
		else:
			config |= self.__ADS1015_REG_CONFIG_MUX_SINGLE_0

		# Set 'start single-conversion' bit
		config |= self.__ADS1015_REG_CONFIG_OS_SINGLE

		# Write config register to the ADC
		bytes = [(config >> 8) & 0xFF, config & 0xFF]
		self.i2c.writeList(self.__ADS1015_REG_POINTER_CONFIG, bytes)

		# Wait for the ADC conversion to complete
		# The minimum delay depends on the sps: delay >= 1/sps
		# We add 0.1ms to be sure
		delay = 1.0/sps+0.0001
		time.sleep(delay)

		# Read the conversion results
		result = self.i2c.readList(self.__ADS1015_REG_POINTER_CONVERT, 2)
		if (self.ic == self.__IC_ADS1015):
			# Shift right 4 bits for the 12-bit ADS1015 and convert to mV
			return ( ((result[0] << 8) | (result[1] & 0xFF)) >> 4 )*pga/2048.0
		else:
		# Return a mV value for the ADS1115
		# (Take signed values into account as well)
			val = (result[0] << 8) | (result[1])
			if val > 0x7FFF:
			  return (val - 0xFFFF)*pga/32768.0
			else:
			  return ( (result[0] << 8) | (result[1]) )*pga/32768.0

while True:
	time.sleep(1)
	__init__(self, address=0x48, ic=__IC_ADS1115, debug=False)

	result = readADCSingleEnded(self, channel=0, pga=6144, sps=250)
	print(result)

le code est assez long mais je pense que tu verras vite le probleme enfin j'espere :s

invite43901482 · 15/05/2015, 15h20

Code:

__init__(self, address=0x48, ic=__IC_ADS1115, debug=False)

Là il y a une erreur, si on veut créer une instance, la ligne serait plutôt quelque chose qui ressemble à

Code:

ads = ADS1x15(address=0x48, ic=__IC_ADS1115, debug=False)

En prenant la remarque du dessus, la ligne

Code:

result = readADCSingleEnded(self, channel=0, pga=6144, sps=250)

sera

Code:

result = ads.readADCSingleEnded(channel=0, pga=6144, sps=250)
print result

**docEmmettBrown** · 15/05/2015, 21h42

ok, j'ai essayé ton code mais ca me met :

NameError: name '__IC_ADS1115' is not defined

**polo974** · 16/05/2015, 11h07

__IC_ADS1115 n'est défini que dans la classe ADS1x15, donc il faut mettre :

self.__IC_ADS1115 dans le def du constructeur...

et accessoirement relire les tutos et autres docs python pour ce qui se trouve après le while True....

genre:

Code:

monADS=ADS1x15(...)
while True:
    monADS.fait quelque_chose_avec()
    time.sleep(1)

**docEmmettBrown** · 18/05/2015, 00h36

donc si j'ai bien compris le nouveau code est :

Code:

#!/usr/bin/python
import re
import smbus
import Adafruit_I2C
import time
# ===========================================================================
# ADS1x15 Class
#
# Originally written by K. Townsend, Adafruit (https://github.com/adafruit/Adafruit-Raspberry-Pi-Python-Code/tree/master/Adafruit_ADS1x15)
# Updates and new functions implementation by Pedro Villanueva, 03/2013.
# The only error in the original code was in line 57:
#              __ADS1015_REG_CONFIG_DR_920SPS    = 0x0050
# should be 
#              __ADS1015_REG_CONFIG_DR_920SPS    = 0x0060     
#
# NOT IMPLEMENTED: Conversion ready pin, page 15 datasheet.
# ===========================================================================

class ADS1x15:
	i2c = None

  # IC Identifiers
	__IC_ADS1015                      = 0x00
	__IC_ADS1115                      = 0x01

  # Pointer Register
	__ADS1015_REG_POINTER_MASK        = 0x03
	__ADS1015_REG_POINTER_CONVERT     = 0x00
	__ADS1015_REG_POINTER_CONFIG      = 0x01
	__ADS1015_REG_POINTER_LOWTHRESH   = 0x02
	__ADS1015_REG_POINTER_HITHRESH    = 0x03

  # Config Register
	__ADS1015_REG_CONFIG_OS_MASK      = 0x8000
	__ADS1015_REG_CONFIG_OS_SINGLE    = 0x8000  # Write: Set to start a single-conversion
	__ADS1015_REG_CONFIG_OS_BUSY      = 0x0000  # Read: Bit = 0 when conversion is in progress
	__ADS1015_REG_CONFIG_OS_NOTBUSY   = 0x8000  # Read: Bit = 1 when device is not performing a conversion

	__ADS1015_REG_CONFIG_MUX_MASK     = 0x7000
	__ADS1015_REG_CONFIG_MUX_DIFF_0_1 = 0x0000  # Differential P = AIN0, N = AIN1 (default)
	__ADS1015_REG_CONFIG_MUX_DIFF_0_3 = 0x1000  # Differential P = AIN0, N = AIN3
	__ADS1015_REG_CONFIG_MUX_DIFF_1_3 = 0x2000  # Differential P = AIN1, N = AIN3
	__ADS1015_REG_CONFIG_MUX_DIFF_2_3 = 0x3000  # Differential P = AIN2, N = AIN3
	__ADS1015_REG_CONFIG_MUX_SINGLE_0 = 0x4000  # Single-ended AIN0
	__ADS1015_REG_CONFIG_MUX_SINGLE_1 = 0x5000  # Single-ended AIN1
	__ADS1015_REG_CONFIG_MUX_SINGLE_2 = 0x6000  # Single-ended AIN2
	__ADS1015_REG_CONFIG_MUX_SINGLE_3 = 0x7000  # Single-ended AIN3

	__ADS1015_REG_CONFIG_PGA_MASK     = 0x0E00
	__ADS1015_REG_CONFIG_PGA_6_144V   = 0x0000  # +/-6.144V range
	__ADS1015_REG_CONFIG_PGA_4_096V   = 0x0200  # +/-4.096V range
	__ADS1015_REG_CONFIG_PGA_2_048V   = 0x0400  # +/-2.048V range (default)
	__ADS1015_REG_CONFIG_PGA_1_024V   = 0x0600  # +/-1.024V range
	__ADS1015_REG_CONFIG_PGA_0_512V   = 0x0800  # +/-0.512V range
	__ADS1015_REG_CONFIG_PGA_0_256V   = 0x0A00  # +/-0.256V range

	__ADS1015_REG_CONFIG_MODE_MASK    = 0x0100
	__ADS1015_REG_CONFIG_MODE_CONTIN  = 0x0000  # Continuous conversion mode
	__ADS1015_REG_CONFIG_MODE_SINGLE  = 0x0100  # Power-down single-shot mode (default)

	__ADS1015_REG_CONFIG_DR_MASK      = 0x00E0  
	__ADS1015_REG_CONFIG_DR_128SPS    = 0x0000  # 128 samples per second
	__ADS1015_REG_CONFIG_DR_250SPS    = 0x0020  # 250 samples per second
	__ADS1015_REG_CONFIG_DR_490SPS    = 0x0040  # 490 samples per second
	__ADS1015_REG_CONFIG_DR_920SPS    = 0x0060  # 920 samples per second
	__ADS1015_REG_CONFIG_DR_1600SPS   = 0x0080  # 1600 samples per second (default)
	__ADS1015_REG_CONFIG_DR_2400SPS   = 0x00A0  # 2400 samples per second
	__ADS1015_REG_CONFIG_DR_3300SPS   = 0x00C0  # 3300 samples per second (also 0x00E0)

	__ADS1115_REG_CONFIG_DR_8SPS      = 0x0000  # 8 samples per second
	__ADS1115_REG_CONFIG_DR_16SPS     = 0x0020  # 16 samples per second
	__ADS1115_REG_CONFIG_DR_32SPS     = 0x0040  # 32 samples per second
	__ADS1115_REG_CONFIG_DR_64SPS     = 0x0060  # 64 samples per second
	__ADS1115_REG_CONFIG_DR_128SPS    = 0x0080  # 128 samples per second
	__ADS1115_REG_CONFIG_DR_250SPS    = 0x00A0  # 250 samples per second (default)
	__ADS1115_REG_CONFIG_DR_475SPS    = 0x00C0  # 475 samples per second
	__ADS1115_REG_CONFIG_DR_860SPS    = 0x00E0  # 860 samples per second

	__ADS1015_REG_CONFIG_CMODE_MASK   = 0x0010
	__ADS1015_REG_CONFIG_CMODE_TRAD   = 0x0000  # Traditional comparator with hysteresis (default)
	__ADS1015_REG_CONFIG_CMODE_WINDOW = 0x0010  # Window comparator

	__ADS1015_REG_CONFIG_CPOL_MASK    = 0x0008
	__ADS1015_REG_CONFIG_CPOL_ACTVLOW = 0x0000  # ALERT/RDY pin is low when active (default)
	__ADS1015_REG_CONFIG_CPOL_ACTVHI  = 0x0008  # ALERT/RDY pin is high when active

	__ADS1015_REG_CONFIG_CLAT_MASK    = 0x0004  # Determines if ALERT/RDY pin latches once asserted
	__ADS1015_REG_CONFIG_CLAT_NONLAT  = 0x0000  # Non-latching comparator (default)
	__ADS1015_REG_CONFIG_CLAT_LATCH   = 0x0004  # Latching comparator

	__ADS1015_REG_CONFIG_CQUE_MASK    = 0x0003
	__ADS1015_REG_CONFIG_CQUE_1CONV   = 0x0000  # Assert ALERT/RDY after one conversions
	__ADS1015_REG_CONFIG_CQUE_2CONV   = 0x0001  # Assert ALERT/RDY after two conversions
	__ADS1015_REG_CONFIG_CQUE_4CONV   = 0x0002  # Assert ALERT/RDY after four conversions
	__ADS1015_REG_CONFIG_CQUE_NONE    = 0x0003  # Disable the comparator and put ALERT/RDY in high state (default)
  
  
  # Dictionaries with the sampling speed values
  # These simplify and clean the code (avoid the abuse of if/elif/else clauses)
	spsADS1115 = {
	8:__ADS1115_REG_CONFIG_DR_8SPS,
	16:__ADS1115_REG_CONFIG_DR_16SPS,
	32:__ADS1115_REG_CONFIG_DR_32SPS,
	64:__ADS1115_REG_CONFIG_DR_64SPS,
	128:__ADS1115_REG_CONFIG_DR_128SPS,
	250:__ADS1115_REG_CONFIG_DR_250SPS,
	475:__ADS1115_REG_CONFIG_DR_475SPS,
	860:__ADS1115_REG_CONFIG_DR_860SPS
	}    
	spsADS1015 = {
	128:__ADS1015_REG_CONFIG_DR_128SPS,
	250:__ADS1015_REG_CONFIG_DR_250SPS,
	490:__ADS1015_REG_CONFIG_DR_490SPS,
	920:__ADS1015_REG_CONFIG_DR_920SPS,
	1600:__ADS1015_REG_CONFIG_DR_1600SPS,
	2400:__ADS1015_REG_CONFIG_DR_2400SPS,
	3300:__ADS1015_REG_CONFIG_DR_3300SPS
	}
  # Dictionariy with the programable gains
	pgaADS1x15 = {
	6144:__ADS1015_REG_CONFIG_PGA_6_144V,
	4096:__ADS1015_REG_CONFIG_PGA_4_096V,
	2048:__ADS1015_REG_CONFIG_PGA_2_048V,
	1024:__ADS1015_REG_CONFIG_PGA_1_024V,
	512:__ADS1015_REG_CONFIG_PGA_0_512V,
	256:__ADS1015_REG_CONFIG_PGA_0_256V
	}    
  


  # Constructor
	def __init__(self, address=0x48, ic=self.__IC_ADS1115, debug=False):
    # Depending on if you have an old or a new Raspberry Pi, you
    # may need to change the I2C bus.  Older Pis use SMBus 0,
    # whereas new Pis use SMBus 1.  If you see an error like:
    # 'Error accessing 0x48: Check your I2C address '
    # change the SMBus number in the initializer below!
		self.i2c = Adafruit_I2C(address)
		self.address = address
		self.debug = debug

    # Make sure the IC specified is valid
		if ((ic < self.__IC_ADS1015) | (ic > self.__IC_ADS1115)):
			if (self.debug):
				print "ADS1x15: Invalid IC specfied: %h" % ic
			return -1
		else:
			self.ic = ic
        
    # Set pga value, so that getLastConversionResult() can use it,
    # any function that accepts a pga value must update this.
		self.pga = 6144    
  
    
	def readADCSingleEnded(self, channel=0, pga=6144, sps=250):
		"Gets a single-ended ADC reading from the specified channel in mV. \
		The sample rate for this mode (single-shot) can be used to lower the noise \
		(low sps) or to lower the power consumption (high sps) by duty cycling, \
		see datasheet page 14 for more info. \
		The pga must be given in mV, see page 13 for the supported values."
    
    # With invalid channel return -1
		if (channel > 3):
			if (self.debug):
				print "ADS1x15: Invalid channel specified: %d" % channel
			return -1
    
    # Disable comparator, Non-latching, Alert/Rdy active low
    # traditional comparator, single-shot mode
		config = self.__ADS1015_REG_CONFIG_CQUE_NONE    | \
				self.__ADS1015_REG_CONFIG_CLAT_NONLAT  | \
				self.__ADS1015_REG_CONFIG_CPOL_ACTVLOW | \
				self.__ADS1015_REG_CONFIG_CMODE_TRAD   | \
				self.__ADS1015_REG_CONFIG_MODE_SINGLE    

    # Set sample per seconds, defaults to 250sps
    # If sps is in the dictionary (defined in init) it returns the value of the constant
    # othewise it returns the value for 250sps. This saves a lot of if/elif/else code!
		if (self.ic == self.__IC_ADS1015):
			config |= self.spsADS1015.setdefault(sps, self.__ADS1015_REG_CONFIG_DR_1600SPS)
		else:
			if ( (sps not in self.spsADS1115) & self.debug):
				print "ADS1x15: Invalid pga specified: %d, using 6144mV" % sps     
			config |= self.spsADS1115.setdefault(sps, self.__ADS1115_REG_CONFIG_DR_250SPS)

    # Set PGA/voltage range, defaults to +-6.144V
		if ( (pga not in self.pgaADS1x15) & self.debug):	  
			print "ADS1x15: Invalid pga specified: %d, using 6144mV" % sps     
		config |= self.pgaADS1x15.setdefault(pga, self.__ADS1015_REG_CONFIG_PGA_6_144V)
		self.pga = pga

    # Set the channel to be converted
		if channel == 3:
			config |= self.__ADS1015_REG_CONFIG_MUX_SINGLE_3
		elif channel == 2:
			config |= self.__ADS1015_REG_CONFIG_MUX_SINGLE_2
		elif channel == 1:
			config |= self.__ADS1015_REG_CONFIG_MUX_SINGLE_1
		else:
			config |= self.__ADS1015_REG_CONFIG_MUX_SINGLE_0

		# Set 'start single-conversion' bit
		config |= self.__ADS1015_REG_CONFIG_OS_SINGLE

		# Write config register to the ADC
		bytes = [(config >> 8) & 0xFF, config & 0xFF]
		self.i2c.writeList(self.__ADS1015_REG_POINTER_CONFIG, bytes)

		# Wait for the ADC conversion to complete
		# The minimum delay depends on the sps: delay >= 1/sps
		# We add 0.1ms to be sure
		delay = 1.0/sps+0.0001
		time.sleep(delay)

		# Read the conversion results
		result = self.i2c.readList(self.__ADS1015_REG_POINTER_CONVERT, 2)
		if (self.ic == self.__IC_ADS1015):
			# Shift right 4 bits for the 12-bit ADS1015 and convert to mV
			return ( ((result[0] << 8) | (result[1] & 0xFF)) >> 4 )*pga/2048.0
		else:
		# Return a mV value for the ADS1115
		# (Take signed values into account as well)
			val = (result[0] << 8) | (result[1])
			if val > 0x7FFF:
			  return (val - 0xFFFF)*pga/32768.0
			else:
			  return ( (result[0] << 8) | (result[1]) )*pga/32768.0

while True:
	time.sleep(1)
        ads = ADS1x15(address=0x48, ic=__IC_ADS1115, debug=False)
	result = ads.readADCSingleEnded(channel=0, pga=6144, sps=250)
        print result

mais ca me met:
line 133 in ADS1x15 def __init__(self, address=0x48, ic=self.__IC_ADS1115, debug=False):
name self is not defined

invite43901482 · 18/05/2015, 09h19

Ben oui dans le paramètre, t'as mis un self, ça n'existe pas en python, ça ! Faut lire un tutoriel de toute urgence...

python : mon compilateur ne reconnait pas une fonction

python : mon compilateur ne reconnait pas une fonction

Re : python : mon compilateur ne reconnait pas une fonction

Re : python : mon compilateur ne reconnait pas une fonction

Re : python : mon compilateur ne reconnait pas une fonction

Re : python : mon compilateur ne reconnait pas une fonction

Re : python : mon compilateur ne reconnait pas une fonction

Re : python : mon compilateur ne reconnait pas une fonction

Re : python : mon compilateur ne reconnait pas une fonction

Re : python : mon compilateur ne reconnait pas une fonction

Re : python : mon compilateur ne reconnait pas une fonction

Re : python : mon compilateur ne reconnait pas une fonction

Re : python : mon compilateur ne reconnait pas une fonction

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