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STD Bluetooth Controlled Switch
License: Public Domain
Mode: Editors' pick
EN:
This simple circuit can be used to switch an electrical appliance on/off wirelessly using Bluetooth. The brain of this system is an Arduino Nano and a Bluetooth module (HC-06). The circuit is powered from a 12V power supply, ideally stabilised. P1 is used as the power input, P2 is connected directly to the relay's contacts.
Explanation: Upon receiving data from the Bluetooth module, Arduino checks, whether it's any of the known commands. If so, it turns on/off the NPN transistor T1, which then activates/deactivates the relay. D1 is used as a flyback diode to protect the transistor from the overvoltage created by the relay's coil. R1 and R2 create a voltage divider for the HC-06 module, as it works with 3.3V, instead of Arduino's 5V (this can be omitted, but I STRONGLY RECOMMEND using them). If you have any questions, feel free to ask :-). I will add the software part later.
SK:
Tento jednoduchý obvod umožňuje spínať elektrické spotrebiče bezdrôtovo cez technológiu Bluetooth. Mozgom tohto systému je doska Arduino Nano a Bluetooth modul HC-06. Obvod sa napája zo zdroja 12V, ideálne stabilizovaných.
Princíp činnosti: Po prijatí dát z Bluetooth modulu, Arduino ich spracuje a podľa toho zopne/rozopne NPN tranzistor T1, ktorý zopne/rozopne relé. D1 sa používa ako ochranná dióda - v cievke sa po odpojení napájania indukuje vysoké napätie v opačnej polarite, ktoré by mohlo zničiť tranzistor. R1 a R2 tvoria napäťový delič, ktorý slúži na zníženie napätia pre HC-06, nakoľko pracuje s úrovňou napätia 3.3V, narozdiel od Arduina, ktoré pracuje s napätím 5V. Môžete ho vynechať, ale SILNE ODPORÚČAM ho použiť (vynechávať len v prípade núdze, HC-06 to síce zvládne, ale nie dlho)! Ak máte nejaké otázky, pokojne sa pýtajte :-). Softvér pridám, akonáhle sa bude dať.
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