NTC Contorl Test

AD_NTC.py

+import time
+import pigpio
+import Adafruit_GPIO.SPI as SPI
+import Adafruit_MCP3008
+import math
+
+SPI_PORT   = 0
+SPI_DEVICE = 0
+ 
+SIGNAL_CHANNEL = 0
+PWM_LED_PIN = 18
+PWM_FREQ = 800
+ 
+mcp = Adafruit_MCP3008.MCP3008(spi=SPI.SpiDev(SPI_PORT, SPI_DEVICE))
+pi = pigpio.pi()
+
+def GetTemperature(data):
+	Rp=10000
+	T2=273.15+25
+	Bx=3950;
+	Ka=273.15
+	#vol = data * (3.3/4096)
+	vol = (data * 3.3) / float(1023)
+	Rt=(3.3-vol) * 1000/vol
+	print(Rt)
+	if((Rt/Rp)<0):
+		return -1
+	else:
+		return 1/(1/T2+math.log(Rt/Rp)/Bx)-Ka+0.5
+
+while True:
+	data = mcp.read_adc(SIGNAL_CHANNEL)
+	#print(data)
+	if(data!=0 and data!= 1023):
+		volts = (data * 3.3) / float(1023)
+		temp = GetTemperature(data)
+		#temp = 0
+		print(data,volts,temp)
+		time.sleep(0.1)

NTC.py

+import spidev
+import time
+import os
+import math
+
+# open(bus, device) : open(X,Y) will open /dev/spidev-X.Y
+spi = spidev.SpiDev()
+spi.open(0,1)
+
+# Read SPI data from MCP3008, Channel must be an integer 0-7
+def ReadADC(ch):
+    if ((ch > 7) or (ch < 0)):
+       return -1
+    adc = spi.xfer2([1,(8+ch)<<4,0])
+    print(adc)
+    #data = ((adc[1]&3)<<8) + adc[2]
+    data = ((adc[1]+3)<<8) + adc[2]
+    return data
+# Convert data to voltage level
+def ReadVolts(data,deci):
+    volts = (data * 3.3) / float(1023)
+    volts = round(volts,deci)
+    return volts
+def GetTemperature(data):
+	Rp=10000
+	T2=273.15+25
+	Bx=3950;
+	Ka=273.15
+	vol = data * (3.3/4096)
+	Rt=(3.3-vol) * 10000/vol
+	if((Rt/Rp)<0):
+		return -1
+	else:
+		return 1/(1/T2+math.log(Rt/Rp)/Bx)-Ka+0.5
+		
+	
+count = 0
+while(count < 10):
+	data = ReadADC(0)
+	vol = ReadVolts(data,2)
+	#temp = GetTemperature(64)
+	#temp = 0
+	print(data,vol)
+	count+=1
+	time.sleep(0.5)

Relay_AD_NTC.py

+import time
+import Adafruit_GPIO.SPI as SPI
+import Adafruit_MCP3008
+import math
+import RPi.GPIO as GPIO
+
+SPI_PORT   = 0
+SPI_DEVICE = 0
+ 
+SIGNAL_CHANNEL = 0
+PWM_LED_PIN = 18
+PWM_FREQ = 800
+ 
+mcp = Adafruit_MCP3008.MCP3008(spi=SPI.SpiDev(SPI_PORT, SPI_DEVICE))
+GPIO.setmode(GPIO.BCM)
+relay_port = 21
+relay = GPIO.setup(relay_port,GPIO.LOW)
+
+
+def GetTemperature(data):
+	Rp=10000
+	T2=273.15+25
+	Bx=3950;
+	Ka=273.15
+	#vol = data * (3.3/4096)
+	vol = (data * 3.3) / float(1023)
+	Rt=(3.3-vol) * 1000/vol
+	print(Rt)
+	if((Rt/Rp)<0):
+		return -1
+	else:
+		return 1/(1/T2+math.log(Rt/Rp)/Bx)-Ka+0.5
+
+while True:
+	data = mcp.read_adc(SIGNAL_CHANNEL)
+	#print(data)
+	if(data!=0 and data!= 1023):
+		volts = (data * 3.3) / float(1023)
+		temp = GetTemperature(data)
+		if(round(temp,2) >40.0):
+			GPIO.output(relay_port,GPIO.LOW)
+		elif(round(temp,2) < 39.9):
+			GPIO.output(relay_port,GPIO.HIGH)
+		#temp = 0
+		print(data,volts,temp)
+		time.sleep(0.1)