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Android Switch Interface

Using an Android smartphone as a remote control or user interface for your microcontroller projects

A low-cost Android phone forms an excellent basis for a high-end user interface or remote control for a microcontroller circuit. In this article we tell you how to implement various wireless sensing and switching functions using an Arduino board with a Bluetooth shield. We also describe how you can program your own Android app for this purpose and what (free) PC software you need for this.

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Materials

120075-PCB.pdf

120075-11.zip

Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

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PCB

Download Gerber file: 120075-1-V10

Component list

Resistors
R1,R2,R3 = 560Ohm
R4 = 100Ohm
R5,R6 = 4.7Ohm
R7 = 10kOhm
R8,R9 = 1kOhm

Semiconductors
D1,D2 = 1N4148
LED1,LED2,LED3 = LED, red, 5mm
T1,T2= BC547
T3 = BS170

Miscellaneous
K1,K2 = 6-pin pinheader
K3,K4 = 8-pin pinheader
K5,K6 = 6-way pinheader socket
K7,K8 = 8-way pinheader socket
K9 = 10-polige header receptacle
RE1,RE2 = 5V miniature relay (e.g. TE Connectivity type MT2-C93401 or OMRON type G5V-2-H1)
S1 = pushbutton with make contact (e.g. B3F-1000)
PCB # 120075-1