Long-Range-Arduino-Doorbell

The goal of this project was to create a cheap, very reliable and efficient long-range wireless doorbell.

• Price: < $10
• Range: Up to 1000 meters
• Power consumption (Idle): < 1µA @ 3V (at 3.27V I measured 193nA)

Features

• The reliability is ensured by two-way communication between the transmitter and receiver. (If the receiver fails to receive a signal due to interference, the transmitter sends another signal until it verifies that it has arrived at the receiver.)
• The transmitter (which runs on two AAA batteries) reports its remaining battery capacity back to the receiver which can then warn you once it gets too low.
• The receiver uses a simple module that plays MP3 files from a micro SD card, so you can make the doorbell sound any way you want.

Required parts

• 1x Arduino Pro Mini (3.3v 8Mhz edition)
• 1x Another Arduino (doesn't matter which one)
• 2x Button
• 2x D-SUN CC1101 module
• 1x DF-Player module
• 1x micro SD card (any size)
• 2x AAA battery (alkaline)
• 1x speaker (I will update this once I've settled on a specific one)
• 1x amplifier (should match power and impedence of speaker)

How does it work

[Battery]--[Arduino]--[CC1101]-)))))))))))   (((((((((((-[CC1101]--[Arduino]--[5v power]
               |                                                       |
            [Button]                                               [speaker]

• You press the button
• First Arduino wakes up out of power-saving (sleep) mode
• Signal is sent to the second Arduino
• Second Arduino plays a doorbell sound
• Second Arduino sends a response to the first Arduino
• First Arduino receives the response and goes back to deep sleep
• (If no response is received the first Arduino tries again...)

Schematics

Coming soon...

How assemble

(It is highly recommended to desolder the LED and voltage regulator from the Arduino Pro Mini for minimal power consumption <1µA.)

Connection between D-SUN CC1101 modules and Arduinos:

GDO0 -> 6
MISO -> 12
MOSI -> 11
GND -> GND
CSN -> 10
SCK -> 13
VCC -> 3v

Connection between DF-Player and Arduino Uno (or whatever you decided on using):

VCC -> VCC
GND -> GND
TX -> 9
RX -> 8

Connection between button and Arduino Pro Mini:

Pin A -> 2
Pin B -> GND

Credits

Big thanks to LSatan for his CC1101 library and for implementing two-way communication and CRC checksum verification on request and even proving complete examples. This project is very much based on the work of LSatan. So leave a star on his repository and consider donating to him.