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Update ADC.py and Datasheet
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a838557765 2020-02-27 10:58:39 +08:00
parent dad7d3d8de
commit ee8fca1e23
2 changed files with 79 additions and 36 deletions
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115
Code/Server/ADC.py
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@ -1,48 +1,93 @@
#!/usr/bin/env python3
#############################################################################
# Filename : ADC.py
# Description : ADC and DAC
# Author : freenove
# modification: 2018/09/15
########################################################################
import smbus
import time
class Adc:
def __init__(self):
self.address = 0x48 #default address of PCF8591
self.bus=smbus.SMBus(1)
self.cmd=0x40 #command
def analogRead(self,chn):#read ADC value,chn:0,1,2,3
# Get I2C bus
self.bus = smbus.SMBus(1)
# I2C address of the device
self.ADDRESS = 0x48
# PCF8591 Command
self.PCF8591_CMD =0x40 #Command
# ADS7830 Command Set
self.ADS7830_CMD_SD_SINGLE = 0x84 # Single-Ended Inputs
self.ADS7830_CMD_SNGL_CHANNEL_0 = 0x00 # +IN = CH0, -IN = GND
self.ADS7830_CMD_SNGL_CHANNEL_1 = 0x40 # +IN = CH1, -IN = GND
self.ADS7830_CMD_SNGL_CHANNEL_2 = 0x10 # +IN = CH2, -IN = GND
self.ADS7830_CMD_SNGL_CHANNEL_3 = 0x50 # +IN = CH3, -IN = GND
self.ADS7830_CMD_SNGL_CHANNEL_4 = 0x20 # +IN = CH4, -IN = GND
self.ADS7830_CMD_SNGL_CHANNEL_5 = 0x60 # +IN = CH5, -IN = GND
self.ADS7830_CMD_SNGL_CHANNEL_6 = 0x30 # +IN = CH6, -IN = GND
self.ADS7830_CMD_SNGL_CHANNEL_7 = 0x70 # +IN = CH7, -IN = GND
self.ADS7830_CMD_PD_POWER_DOWN = 0x00 # Power Down Between A/D Converter Conversions
self.ADS7830_CMD_PD_REF_OFF = 0x04 # Internal Reference OFF and A/D Converter ON
self.ADS7830_CMD_PD_REF_ON = 0x08 # Internal Reference ON and A/D Converter OFF
self.ADS7830_CMD_PD_REF_ON_AD_ON = 0x0C # Internal Reference ON and A/D Converter ON
for i in range(3):
aa=self.bus.read_byte_data(self.ADDRESS,0xf4)
if aa < 150:
self.Index="PCF8591"
else:
self.Index="ADS7830"
def analogReadPCF8591(self,chn):#PCF8591 read ADC value,chn:0,1,2,3
value=[0,0,0,0,0,0,0,0,0]
for i in range(9):
value[i] = self.bus.read_byte_data(self.address,self.cmd+chn)
value[i] = self.bus.read_byte_data(self.ADDRESS,self.PCF8591_CMD+chn)
value=sorted(value)
return value[4]
def analogWrite(self,value):#write DAC value
self.bus.write_byte_data(address,cmd,value)
def loop(self):
while True:
self.value = self.analogRead(2) #read the ADC value of channel 0,1,2,3
#analogWrite(value) #write the DAC value
self.voltage = self.value / 256.0 * 3.3 #calculate the voltage value
print ('ADC Value : %d, Voltage : %.2f'%(self.value,self.voltage))
time.sleep(0.01)
def recvADC(self,channel):
return value[4]
def analogWritePCF8591(self,value):#PCF8591 write DAC value
self.bus.write_byte_data(self.ADDRESS,cmd,value)
def recvPCF8591(self,channel):#PCF8591 write DAC value
while(1):
self.value = self.analogRead(channel) #read the ADC value of channel 0,1,2,
self.value1 = self.analogRead(channel)
if self.value==self.value1:
value1 = self.analogReadPCF8591(channel) #read the ADC value of channel 0,1,2,
value2 = self.analogReadPCF8591(channel)
if value1==value2:
break;
self.voltage = self.value / 256.0 * 3.3 #calculate the voltage value
self.voltage = round(self.voltage,2)
return self.voltage
def destroy():
voltage = value1 / 256.0 * 3.3 #calculate the voltage value
voltage = round(voltage,2)
return voltage
def recvADS7830(self,channel):
"""Select the Command data from the given provided value above"""
if channel == 0:
COMMAND_SET = (self.ADS7830_CMD_SD_SINGLE | self.ADS7830_CMD_SNGL_CHANNEL_0)
elif channel == 1:
COMMAND_SET = (self.ADS7830_CMD_SD_SINGLE | self.ADS7830_CMD_SNGL_CHANNEL_1)
elif channel == 2:
COMMAND_SET = (self.ADS7830_CMD_SD_SINGLE | self.ADS7830_CMD_SNGL_CHANNEL_2)
elif channel == 3:
COMMAND_SET = (self.ADS7830_CMD_SD_SINGLE | self.ADS7830_CMD_SNGL_CHANNEL_3)
elif channel == 4:
COMMAND_SET = (self.ADS7830_CMD_SD_SINGLE | self.ADS7830_CMD_SNGL_CHANNEL_4)
elif channel == 5:
COMMAND_SET = (self.ADS7830_CMD_SD_SINGLE | self.ADS7830_CMD_SNGL_CHANNEL_5)
elif channel == 6:
COMMAND_SET = (self.ADS7830_CMD_SD_SINGLE | self.ADS7830_CMD_SNGL_CHANNEL_6)
elif channel == 7:
COMMAND_SET = (self.ADS7830_CMD_SD_SINGLE | self.ADS7830_CMD_SNGL_CHANNEL_7)
self.bus.write_byte(self.ADDRESS, COMMAND_SET)
while(1):
value1 = self.bus.read_byte(self.ADDRESS)
value2 = self.bus.read_byte(self.ADDRESS)
if value1==value2:
break;
voltage = value1 / 256.0 * 3.3 #calculate the voltage value
voltage = round(voltage,2)
return voltage
def recvADC(self,channel):
if self.Index=="PCF8591":
data=self.recvPCF8591(channel)
elif self.Index=="ADS7830":
data=self.recvADS7830(channel)
return data
def i2cClose(self):
self.bus.close()
def loop():
adc=Adc()
while True:
adc=Adc()
Left_IDR=adc.recvADC(0)
print (Left_IDR)
Right_IDR=adc.recvADC(1)
@ -50,15 +95,13 @@ def loop():
Power=adc.recvADC(2)*3
print (Power)
time.sleep(1)
#print '----'
print ('----')
def destroy():
pass
# Main program logic follows:
if __name__ == '__main__':
print ('Program is starting ... ')
try:
loop()
except KeyboardInterrupt: # When 'Ctrl+C' is pressed, the child program destroy() will be executed.
destroy()
destroy()

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Datasheet/ADS7830.pdf Normal file
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