Embedded Files
Funktionsweise:
Bei Node Red wird im Intervall das Programm Node_8591.py aufgerufen. Darin wird zum einen ein übergebenes Argument als Dimmwert auf den digitalen Ausgang gegeben, sowie die Werte der 4 Analogen Eingänge rausgefiltert. Das Ergebnis wird ausgegeben und mittels Switch, Split und Exchange so verarbeitet, dass ich die Werte jeweils bekomme. Diese werden dann auf der Seite "Sensoren" angezeigtBeim Intervall werden alle Werte für den Funktionsaufruf gleich mit übergeben.Angeschlossen ist ein PCF8591 mit VCC=3,3V, GND, SCL und SDA. Er besitzt bei mir die Adresse 0x48 (Dezimal = 72)Funktionsweise:
Das Python Programm:
#!/usr/bin/python3#Mit diesem Programm wird ein über den I2C Bus angeschlossener Expander ausgelesen und angesteuert#Zusammenspiel mit Node Red#Es handelt sich um den Portexpander 8591 mit 4 AI und 1 AODas Python Programm:
import smbus, timeimport sys
Arg = sys.argv #Liste erstellen mit allen SystemargumentenArg.pop(0) #Namen der Datei rauslöschenprint(Arg) #Erhaltene Systemargumente ausgeben
bus = smbus.SMBus(1)Portexpander = 0x48 #Adresse des Portexpanders
def get(register): read = bus.read_byte_data(Portexpander, 0x40+register) time.sleep(0.01) read = bus.read_byte_data(Portexpander, 0x40+register) return read
def set(register, daten): write = bus.write_byte_data(Portexpander, 0x40+register, daten) #0x40 steht dabei als Grundvoraussetzung, dass AnalogOut aktiviert ist. return
Wiedergabe = False #Hilfsvariableset(3, int(Arg[0])) #Analogen Ausgang setzen mit Argument 0 aus Liste
print("Ain0:",get(0))print("Ain1:",get(1))print("Ain2:",get(2))print("Ain3:",get(3))print(Arg[1]) #Argumente 1 aus Liste ausgeben#while True:
#AIn0 = LDR#AIn1 = Unbelegt#AIn2 = Temperaturfühler#AIn3 = Potentiometer#AOut = LED
Und für Node Red:
[{"id":"a6b42358.b2774","type":"debug","z":"39d977c4.586c9","name":"Neu","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","x":1490,"y":220,"wires":[]},{"id":"d9878f13.3de0b","type":"exec","z":"39d977c4.586c9","command":"","addpay":true,"append":"","useSpawn":"false","timer":"","oldrc":false,"name":"","x":510,"y":220,"wires":[["512de695.19de08"],["b01b51a7.ca2b7"],[]]},{"id":"eaf05993.da13f","type":"inject","z":"39d977c4.586c9","name":"","topic":"","payload":"sudo /usr/bin/python3 /home/pi/Python/Einstieg/I2C/Node_8591.py 190 0","payloadType":"str","repeat":"2","crontab":"","once":false,"onceDelay":0.1,"x":330,"y":220,"wires":[["d9878f13.3de0b"]]},{"id":"b01b51a7.ca2b7","type":"debug","z":"39d977c4.586c9","name":"ERR","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","x":670,"y":240,"wires":[]},{"id":"220f22a8.e8b49e","type":"switch","z":"39d977c4.586c9","name":"","property":"payload","propertyType":"msg","rules":[{"t":"cont","v":"Neu","vt":"str"},{"t":"cont","v":"Ain0","vt":"str"},{"t":"cont","v":"Ain1","vt":"str"},{"t":"cont","v":"Ain2","vt":"str"},{"t":"cont","v":"Ain3","vt":"str"},{"t":"empty"}],"checkall":"true","repair":false,"outputs":6,"x":830,"y":320,"wires":[["a6b42358.b2774"],["5fd86b52.f63884"],["1d6e1449.7a50e4"],["1977ada1.7cb34a"],["1d488750.9193c9"],["81a7f0b3.a0c228"]]},{"id":"512de695.19de08","type":"split","z":"39d977c4.586c9","name":"","splt":"\\n","spltType":"str","arraySplt":1,"arraySpltType":"len","stream":false,"addname":"","x":760,"y":200,"wires":[["220f22a8.e8b49e"]]},{"id":"81a7f0b3.a0c228","type":"debug","z":"39d977c4.586c9","name":"Sonstiges","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","x":1500,"y":440,"wires":[]},{"id":"5fd86b52.f63884","type":"change","z":"39d977c4.586c9","name":"","rules":[{"t":"change","p":"payload","pt":"msg","from":"Ain0: ","fromt":"str","to":"","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":1120,"y":260,"wires":[["f5c1c8eb.23df68"]]},{"id":"1d6e1449.7a50e4","type":"change","z":"39d977c4.586c9","name":"","rules":[{"t":"change","p":"payload","pt":"msg","from":"Ain1: ","fromt":"str","to":"","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":1120,"y":320,"wires":[["ccf1cca6.40099"]]},{"id":"1977ada1.7cb34a","type":"change","z":"39d977c4.586c9","name":"","rules":[{"t":"change","p":"payload","pt":"msg","from":"Ain2: ","fromt":"str","to":"","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":1120,"y":360,"wires":[["91372d17.09d748"]]},{"id":"1d488750.9193c9","type":"change","z":"39d977c4.586c9","name":"","rules":[{"t":"change","p":"payload","pt":"msg","from":"Ain3: ","fromt":"str","to":"","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":1120,"y":400,"wires":[["96b9a0d.85c536"]]},{"id":"f5c1c8eb.23df68","type":"ui_text","z":"39d977c4.586c9","group":"a1d5e8a8.a9943","order":1,"width":0,"height":0,"name":"","label":"Lichtsensor","format":"{{msg.payload}}","layout":"row-spread","x":1510,"y":260,"wires":[]},{"id":"ccf1cca6.40099","type":"ui_text","z":"39d977c4.586c9","group":"a1d5e8a8.a9943","order":2,"width":0,"height":0,"name":"","label":"Ain1","format":"{{msg.payload}}","layout":"row-spread","x":1490,"y":300,"wires":[]},{"id":"91372d17.09d748","type":"ui_text","z":"39d977c4.586c9","group":"a1d5e8a8.a9943","order":3,"width":0,"height":0,"name":"","label":"Temperatur","format":"{{msg.payload}}","layout":"row-spread","x":1510,"y":340,"wires":[]},{"id":"96b9a0d.85c536","type":"ui_text","z":"39d977c4.586c9","group":"a1d5e8a8.a9943","order":4,"width":0,"height":0,"name":"","label":"Potentiometer","format":"{{msg.payload}}","layout":"row-spread","x":1520,"y":380,"wires":[]},{"id":"a1d5e8a8.a9943","type":"ui_group","z":"","name":"PCF8591","tab":"fe961090.159ee8","order":2,"disp":true,"width":"6","collapse":false},{"id":"fe961090.159ee8","type":"ui_tab","z":"","name":"Sensoren","icon":"dashboard","order":1,"disabled":false,"hidden":false}] Und für Node Red:
Mit I2C OutNode
Mit I2C OutNode
Wichtig ist hier, dass die Werte als Dezimalzahl eingetragen werden müssen.
Adresse = HEX 0x48 = DEC 72
Command (Befehl) = HEX 0x44 = DEC 68
Die Funktionen der Befehle könnt ihr dem Datenblatt entnehmen.
[{"id":"e8019983.b7b658","type":"i2c out","z":"39d977c4.586c9","name":"","address":"72","command":"68","payload":"180","payloadType":"num","count":"1","x":740,"y":520,"wires":[]},{"id":"1b8a4736.c6b2a1","type":"inject","z":"39d977c4.586c9","name":"","topic":"","payload":"","payloadType":"str","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":540,"y":520,"wires":[["e8019983.b7b658"]]}]
I2C Out Node und Slider
I2C Out Node und Slider
Der Slider ist so eingestellt, dass er nur von 120 - 255 sendet. Die Onboard LED leuchtet erst ab etwa 130.
[{"id":"74d2fa06.3fff4c","type":"ui_slider","z":"39d977c4.586c9","name":"","label":"LED","tooltip":"","group":"9b3048f1.4f8cc","order":0,"width":0,"height":0,"passthru":true,"outs":"all","topic":"","min":"120","max":"255","step":1,"x":240,"y":520,"wires":[["924c0822.9bfb9"]]},{"id":"924c0822.9bfb9","type":"i2c out","z":"39d977c4.586c9","name":"","address":"72","command":"68","payload":"payload","payloadType":"msg","count":"1","x":480,"y":520,"wires":[]},{"id":"9b3048f1.4f8cc","type":"ui_group","z":"","name":"Ultraschall","tab":"fe961090.159ee8","order":1,"disp":true,"width":"6","collapse":false},{"id":"fe961090.159ee8","type":"ui_tab","z":"","name":"Sensoren","icon":"dashboard","order":1,"disabled":false,"hidden":false}]
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