Why use this shield when you can customize with wires Exactly, because of the last word in the point made above. WIRES make your project or instrument look very old fashioned and ugly. This is the reason why people prefer PCBs over a breadboard. This shield takes care of that and ensures you have a smaller number of wires (Coming only from the sensors) in your project.

Connection guide The relays operate through a phototransistor of a Toshiba optocoupler, connected to the digital pins of the Arduino board. The optocoupler isolates from any short circuit happening on the output load, which is to be connected. The Bluetooth is a standard HC-05 Bluetooth module. The overall design of the board is user friendly in the sense that users can change the Bluetooth modules if it goes bad by any chance. Bluetooth communication is a serial communication and can be programmed via Arduino IDE, available for download. There are various platforms for free app developments such as MIT app inventor, which is the easiest I have tested. Users have to develop their own apps and Arduino programs for their specific requirements. The relays on the board are rated for 7A, and the track width is also suitable for handling this much current. (Most relay only boards available in the market have a track width suitable only for a current up to 4A.) The relays are connected as follows---

• Relay 1 - digital pin 11
• Relay 2 - digital pin 10
• Relay 3 - digital pin 9
• Relay 4 - digital pin 8

All the connections and the board are tested after soldering to ensure there are no manufacturing defects left. The pins, other than relay pins (Digital pins 2 to 7), Analog in pins as well as PWR section of Arduino are kept open with female headers, in case users have to connect the sensors and operate relays accordingly.
The price of the board is kept very low, because the idea behind making this is not to make profit but to facilitate the DIYers and hobbyists.

Just plug this shield on your Arduino board and there you go

Features of the relay Bluetooth shield—

• 1. Low cost meant for prototyping.
• 1. No clumsy wires in the project.
• 1. Isolated from microcontroller
• 1. Based on open source hardware and software.
• 1. Relays can handle current of 7A (Rated for 10A).
• 1. Embedded Bluetooth support and removable Bluetooth module.
• 1. Proudly made in India.
• 1. Relays are placed carefully so theat they won't short circuit with USB or ICSP headers...

This is sold just as shield without an Arduino board. Users have to buy the Arduino board separately

Please request shipping rate info for your respective country (Except India)