Analog input added!

Analog_and_temp.py

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+#!/usr/bin/env python
+import time
+import datetime
+import os
+import RPi.GPIO as GPIO
+
+GPIO.setmode(GPIO.BCM)
+DEBUG = 1
+LOGGER = 1
+
+# read SPI data from MCP3008 chip, 8 possible adc's (0 thru 7)
+def readadc(adcnum, clockpin, mosipin, misopin, cspin):
+        if ((adcnum > 7) or (adcnum < 0)):
+                return -1
+        GPIO.output(cspin, True)
+
+        GPIO.output(clockpin, False)  # start clock low
+        GPIO.output(cspin, False)     # bring CS low
+
+        commandout = adcnum
+        commandout |= 0x18  # start bit + single-ended bit
+        commandout <<= 3    # we only need to send 5 bits here
+        for i in range(5):
+                if (commandout & 0x80):
+                        GPIO.output(mosipin, True)
+                else:   
+                        GPIO.output(mosipin, False)
+                commandout <<= 1
+                GPIO.output(clockpin, True)
+                GPIO.output(clockpin, False)
+
+        adcout = 0
+        # read in one empty bit, one null bit and 10 ADC bits
+        for i in range(12):
+                GPIO.output(clockpin, True)
+                GPIO.output(clockpin, False)
+                adcout <<= 1
+                if (GPIO.input(misopin)):
+                        adcout |= 0x1
+
+        GPIO.output(cspin, True)
+
+        adcout /= 2       # first bit is 'null' so drop it
+        return adcout
+
+# change these as desired - they're the pins connected from the
+# SPI port on the ADC to the Cobbler
+SPICLK = 18
+SPIMISO = 23
+SPIMOSI = 24
+SPICS = 25
+
+# set up the SPI interface pins
+GPIO.setup(SPIMOSI, GPIO.OUT)
+GPIO.setup(SPIMISO, GPIO.IN)
+GPIO.setup(SPICLK, GPIO.OUT)
+GPIO.setup(SPICS, GPIO.OUT)
+
+# temperature sensor connected channel 0 of mcp3008
+adcnum = 0
+
+while True:
+        # read the analog pin (temperature sensor LM35)
+        read_adc0 = readadc(adcnum, SPICLK, SPIMOSI, SPIMISO, SPICS)
+
+        # convert analog reading to millivolts = ADC * ( 3300 / 1024 )
+        millivolts = read_adc0 * ( 3300.0 / 1024.0)
+
+        # 10 mv per degree 
+        temp_C = ((millivolts - 100.0) / 10.0) - 40.0
+
+        # convert celsius to fahrenheit 
+        temp_F = ( temp_C * 9.0 / 5.0 ) + 32
+
+        # remove decimal point from millivolts
+        millivolts = "%d" % millivolts
+
+        # show only one decimal place for temprature and voltage readings
+        temp_C = "%.1f" % temp_C
+        temp_F = "%.1f" % temp_F
+
+	if DEBUG:
+		# Print what we have gathered to the Screen!
+        	print "read_adc0:\t", read_adc0
+        	print "millivolts:\t", millivolts
+        	print "temp_C:\t\t", temp_C
+        	print "temp_F:\t\t", temp_F
+        	print
+
+        if LOGGER:
+		# open a file for writing... append mode
+		logtime = datetime.datetime.now()
+		temphist = open('temp_hist', 'a')
+		temphist.write(logtime.strftime("%Y-%m-%d %H:%M") + '\t' + 'temp_C:\t' + temp_C + '\t' + 'temp_F:' + '\t' + temp_F + '\n')
+
+
+	# Sleep for 5 seconds... 
+        time.sleep(5)
+
+	#If you want to log this data, check out adafruit-cosm-temp.py program

adafruit-cosm-temp.py

@@ -0,0 +1,111 @@
+#!/usr/bin/env python
+import time
+import os
+import RPi.GPIO as GPIO
+import eeml
+
+GPIO.setmode(GPIO.BCM)
+DEBUG = 1
+LOGGER = 0
+
+# read SPI data from MCP3008 chip, 8 possible adc's (0 thru 7)
+def readadc(adcnum, clockpin, mosipin, misopin, cspin):
+        if ((adcnum > 7) or (adcnum < 0)):
+                return -1
+        GPIO.output(cspin, True)
+
+        GPIO.output(clockpin, False)  # start clock low
+        GPIO.output(cspin, False)     # bring CS low
+
+        commandout = adcnum
+        commandout |= 0x18  # start bit + single-ended bit
+        commandout <<= 3    # we only need to send 5 bits here
+        for i in range(5):
+                if (commandout & 0x80):
+                        GPIO.output(mosipin, True)
+                else:   
+                        GPIO.output(mosipin, False)
+                commandout <<= 1
+                GPIO.output(clockpin, True)
+                GPIO.output(clockpin, False)
+
+        adcout = 0
+        # read in one empty bit, one null bit and 10 ADC bits
+        for i in range(12):
+                GPIO.output(clockpin, True)
+                GPIO.output(clockpin, False)
+                adcout <<= 1
+                if (GPIO.input(misopin)):
+                        adcout |= 0x1
+
+        GPIO.output(cspin, True)
+
+        adcout /= 2       # first bit is 'null' so drop it
+        return adcout
+
+# change these as desired - they're the pins connected from the
+# SPI port on the ADC to the Cobbler
+SPICLK = 18
+SPIMISO = 23
+SPIMOSI = 24
+SPICS = 25
+
+# set up the SPI interface pins
+GPIO.setup(SPIMOSI, GPIO.OUT)
+GPIO.setup(SPIMISO, GPIO.IN)
+GPIO.setup(SPICLK, GPIO.OUT)
+GPIO.setup(SPICS, GPIO.OUT)
+
+# COSM variables. The API_KEY and FEED are specific to your COSM account and must be changed 
+#API_KEY = '5RNOO3ShYJxYiq2V2sgSRtz3112SAKxFQjNDQmNXc0RScz0g'
+#FEED = 68872
+API_KEY = 'YOUR_API_KEY'
+FEED = YOUR_FEED_ID
+
+API_URL = '/v2/feeds/{feednum}.xml' .format(feednum = FEED)
+
+# temperature sensor connected channel 0 of mcp3008
+adcnum = 0
+
+while True:
+        # read the analog pin (temperature sensor LM35)
+        read_adc0 = readadc(adcnum, SPICLK, SPIMOSI, SPIMISO, SPICS)
+
+        # convert analog reading to millivolts = ADC * ( 3300 / 1024 )
+        millivolts = read_adc0 * ( 3300.0 / 1024.0)
+
+        # 10 mv per degree 
+        temp_C = ((millivolts - 100.0) / 10.0) - 40.0
+
+        # convert celsius to fahrenheit 
+        temp_F = ( temp_C * 9.0 / 5.0 ) + 32
+
+        # remove decimal point from millivolts
+        millivolts = "%d" % millivolts
+
+        # show only one decimal place for temprature and voltage readings
+        temp_C = "%.1f" % temp_C
+        temp_F = "%.1f" % temp_F
+
+        if DEBUG:
+                print "read_adc0:\t", read_adc0
+                print "millivolts:\t", millivolts
+                print "temp_C:\t\t", temp_C
+                print "temp_F:\t\t", temp_F
+                print
+
+        if LOGGER:
+                # open up your cosm feed
+                pac = eeml.Pachube(API_URL, API_KEY)
+
+                #send celsius data
+                pac.update([eeml.Data(0, temp_C, unit=eeml.Celsius())])
+
+                #send fahrenheit data
+                pac.update([eeml.Data(1, temp_F, unit=eeml.Fahrenheit())])
+
+                # send data to cosm
+                pac.put()
+
+        # hang out and do nothing for 10 seconds, avoid flooding cosm
+        time.sleep(30)