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pm:prj2021:abasoc:smarthome [2021/04/25 23:54] tudor.niculescu0610 created |
pm:prj2021:abasoc:smarthome [2021/06/03 11:58] (current) tudor.niculescu0610 |
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| - | TODO | + | ======SmartHome cu Arduino prin RS485====== |
| + | |||
| + | Autor: [[tudor.h.niculescu@gmail.com | Tudor Horia Niculescu]] | ||
| + | |||
| + | |||
| + | ====== Introducere ====== | ||
| + | Scopul proiectului este sa folosesc un arduino pentru a interfata cateva tipuri diferite de senzori cu RS485 - Modbus, pentru a putea fi folositi intr-un proiect de tipul SmartHome. | ||
| + | |||
| + | ====== Schema Bloc ====== | ||
| + | {{ :pm:prj2021:abasoc:thniculescu_smarthome.jpg?600 |}} | ||
| + | |||
| + | ====== Hardware Design ====== | ||
| + | Lista de piese: | ||
| + | * Arduino UNO | ||
| + | * Breadboard | ||
| + | * Senzor optic CNY70 | ||
| + | * UART TTL to RS485 converter | ||
| + | * USB to serial RS485 | ||
| + | |||
| + | {{ :pm:prj2021:abasoc:smarthomers485-schema-electrica.png?600 |}} | ||
| + | |||
| + | ====== Software Design ====== | ||
| + | Proiectul e format din 2 parti: | ||
| + | * slave - Arduino | ||
| + | * master - Python | ||
| + | |||
| + | Codul de slave citeste regulat senzorul si raspunde la requesturi(citiri) modbus. Foloseste biblioteca ArduinoModbus. | ||
| + | |||
| + | Codul de master ruleaza pe calculator, si citeste date de la sclavii conectati la busul RS485. Foloseste biblioteca de python minimalmodbus. | ||
| + | |||
| + | ====== Rezultate Obținute ====== | ||
| + | Am reusit sa citesc senzorul pe arduino si sa afisez la seriala. | ||
| + | Calculatorul si Arduinoul comunica prin RS485-Modbus dar checksumul raspunsurilor de la Arduino este prost. Nu am reusit sa fac debugging intrucat folosesc seriala pentru comunicare prin RS485. | ||
| + | |||
| + | Eroare checksum: | ||
| + | Traceback (most recent call last): | ||
| + | File "./master-rs485.py", line 13, in <module> | ||
| + | val = instrument.read_register(0, 0, 3) | ||
| + | File "/usr/local/lib/python2.7/dist-packages/minimalmodbus.py", line 258, in read_register | ||
| + | return self._genericCommand(functioncode, registeraddress, numberOfDecimals=numberOfDecimals, signed=signed) | ||
| + | File "/usr/local/lib/python2.7/dist-packages/minimalmodbus.py", line 697, in _genericCommand | ||
| + | payloadFromSlave = self._performCommand(functioncode, payloadToSlave) | ||
| + | File "/usr/local/lib/python2.7/dist-packages/minimalmodbus.py", line 798, in _performCommand | ||
| + | payloadFromSlave = _extractPayload(response, self.address, self.mode, functioncode) | ||
| + | File "/usr/local/lib/python2.7/dist-packages/minimalmodbus.py", line 1075, in _extractPayload | ||
| + | raise ValueError(text) | ||
| + | ValueError: Checksum error in rtu mode: '\x01\x83' instead of '\x00\x00' . The response is: '\x01\x83\x02\xc0\xf1\x01\x83' (plain response: | ||
| + | '\x01\x83\x02\xc0\xf1\x01\x83') | ||
| + | |||
| + | {{:pm:prj2021:abasoc:smarthomers485-poza.jpeg?400}} | ||
| + | |||
| + | https://youtu.be/BwLi745r3rU | ||
| + | |||
| + | ====== Download ====== | ||
| + | {{:pm:prj2021:abasoc:smarthomers485.zip | Source code }} | ||
| + | |||
| + | ====== Bibliografie/Resurse ====== | ||
| + | [[https://ocw.cs.pub.ro/courses/pm/prj2021/abasoc/smarthome?do=export_pdf | PDF]] \\ | ||
| + | https://www.arduino.cc/en/ArduinoModbus/ArduinoModbus \\ | ||
| + | https://minimalmodbus.readthedocs.io/en/stable/apiminimalmodbus.html \\ | ||
