Update

Update ADC.py and Datasheet

Author: ZhiJGuo

Code/Server/ADC.py

@@ -1,64 +1,107 @@
-#!/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):
+            value1 = self.analogReadPCF8591(channel)   #read the ADC value of channel 0,1,2,
+            value2 = self.analogReadPCF8591(channel)
+            if value1==value2:
+                break;
+        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):
-            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.bus.read_byte(self.ADDRESS)
+            value2 = self.bus.read_byte(self.ADDRESS)
+            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 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)
         print (Right_IDR)
         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()