ugnen

commit dbe5dbe194df431b177e75778c8ed7289ce4f0af
parent 5483c3dd7d64858ec426d645b7eaee7f6b9a4ec1
Author: rbckman <rob@tarina.org>
Date:   Thu,  8 Sep 2022 10:51:35 +0100

Merge branch 'master' of https://git.tarina.org/ugnen

Diffstat:
A
max6675.py
 | 
60
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A
temp_read_1_sensor.py
 | 
39
+++++++++++++++++++++++++++++++++++++++
M
ugnen.py
 | 
21
+++++++++++++++------

3 files changed, 114 insertions(+), 6 deletions(-)
diff --git a/max6675.py b/max6675.py
@@ -0,0 +1,60 @@
+import RPi.GPIO as GPIO
+import time
+GPIO.setmode(GPIO.BOARD)
+GPIO.setwarnings(False)
+
+# set pin number for communicate with MAX6675
+def set_pin (CS, SCK, SO, UNIT):
+    global sck
+    sck= SCK
+    global so
+    so = SO
+    global unit
+    unit = UNIT
+    
+    GPIO.setup(CS, GPIO.OUT, initial = GPIO.HIGH)
+    GPIO.setup(SCK, GPIO.OUT, initial = GPIO.LOW)
+    GPIO.setup(SO, GPIO.IN)
+
+def read_temp(cs_no):
+    
+    GPIO.output(cs_no, GPIO.LOW)
+    time.sleep(0.002)
+    GPIO.output(cs_no, GPIO.HIGH)
+    time.sleep(0.22)
+
+    GPIO.output(cs_no, GPIO.LOW)
+    GPIO.output(sck, GPIO.HIGH)
+    time.sleep(0.001)
+    GPIO.output(sck, GPIO.LOW)
+    Value = 0
+    for i in range(11, -1, -1):
+        GPIO.output(sck, GPIO.HIGH)
+        Value = Value + (GPIO.input(so) * (2 ** i))
+        GPIO.output(sck, GPIO.LOW)
+
+    GPIO.output(sck, GPIO.HIGH)
+    error_tc = GPIO.input(so)
+    GPIO.output(sck, GPIO.LOW)
+
+    for i in range(2):
+        GPIO.output(sck, GPIO.HIGH)
+        time.sleep(0.001)
+        GPIO.output(sck, GPIO.LOW)
+
+    GPIO.output(cs_no, GPIO.HIGH)
+
+    if unit == 0:
+        temp = Value
+    if unit == 1:
+        temp = Value * 0.25
+    if unit == 2:
+        temp = Value * 0.25 * 9.0 / 5.0 + 32.0
+
+    if error_tc != 0:
+        return -cs_no
+    else:
+        return temp
+
+GPIO.cleanup()
+
diff --git a/temp_read_1_sensor.py b/temp_read_1_sensor.py
@@ -0,0 +1,39 @@
+# before import the max6675, you must save the max6675.py file at "/usr/lib/python2.7/dist-packages"
+
+# wiring
+# Raspberry         MAX6675
+#       GND   ------   GND
+#        5V     ------   VCC
+#   pin 18     ------   SCK
+#   pin 22     ------   CS
+#   pin 16     ------   SO
+
+# import max6675 module.
+import max6675
+
+# set the pin for communicate with MAX6675
+cs = 22
+sck = 18
+so = 16
+
+# max6675.set_pin(CS, SCK, SO, unit)   [unit : 0 - raw, 1 - Celsius, 2 - Fahrenheit]
+max6675.set_pin(cs, sck, so, 1)
+
+try:
+    while 1:
+        # read temperature connected at CS 22
+        a = max6675.read_temp(cs)
+
+        # print temperature
+        print a
+
+        # when there are some errors with sensor, it return "-" sign and CS pin number
+        # in this case it returns "-22" 
+        
+        max6675.time.sleep(2)
+        
+except KeyboardInterrupt:
+    pass
+
+
+
diff --git a/ugnen.py b/ugnen.py
@@ -5,8 +5,16 @@ import requests
 import socket
 import os
 import pickle
-import serial
+#import serial
 import blessed
+import max6675
+
+# set the pin for communicate with MAX6675
+cs = 20
+sck = 26
+so = 16
+# max6675.set_pin(CS, SCK, SO, unit)   [unit : 0 - raw, 1 - Celsius, 2 - Fahrenheit]
+max6675.set_pin(cs, sck, so, 1)
 
 term = blessed.Terminal()
 
@@ -40,14 +48,15 @@ GPIO.setup(relaypin, GPIO.OUT) #RELAY
 GPIO.output(relaypin, GPIO.LOW)
 
 
-try:
-    arduino = serial.Serial(port='/dev/ttyUSB0', baudrate=9600, timeout=.1)
-except:
-    arduino = ''
+#try:
+#    arduino = serial.Serial(port='/dev/ttyUSB0', baudrate=9600, timeout=.1)
+#except:
+#    arduino = ''
 
 def read_temp():
     try:
-        temp = arduino.readline().decode('utf-8').rstrip()
+        temp = max6675.read_temp(cs)
+        #temp = arduino.readline().decode('utf-8').rstrip()
     except:
         return 0
     return temp