Elektor Team
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Android I/O Board (1)

Based on a Labs project | June 2015 | Find it here
Android I/O Board (1)
Android devices are ideal for controlling all sorts of electronic circuitry: low cost, lots of processing power, touchscreen interface and various wireless communication options. With this 22-channel universal I/O board and a matching app, you can easily switch devices on and off, make measurements, control motors, input or output analog signals and much more, all from your Android device. The hardware is described in this article, the first of a series.
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Download the BOM list
The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
Want to learn more about our BOM list? Read the BOM list article for extra information.
Component list
Component List
R1,R2,R3,R4 = 470? 1%, SMD 0805
R5,R7,R8,R10,R14,R15 = 330? 1%, SMD 0805
R6,R9,R16 = 10k? 1%, SMD 0805
R11 = 10k? NTC, SMD 0805 (e.g. Vishay NTCS0805E3103JHT)
R12,R13 = 2.2k? 1%, SMD 0805

C1,C2 = 100nF 25 V, 10%, SMD 0805
C3 = 4.7µF 25V, 10%, SMD 0805
C4 = 1µF 25V, 10%, SMD 0805

LED1,LED2,LED3,LED4 = low-current LED, green, SMD 0805
IC1 = PIC16F1938-I/SO, SOIC28, programmed, Elektor Store # 150057-41
IC2 = 24FC256-I/SN, SOIC8
IC3 = MCP1702T-3302E/CB, SOT23A

K1 = micro-USB 2.0 connector type B, SMD
K2 = 26-pin (2x13) pinheader, 0.1’’ pitch
K3 = 6-pin (2x3) pinheader, 0.1’’ pitch
K4 = 2-pin pinheader, 0.1’’ pitch
K5 = 6-pin pinheader, 0.1’’ pitch
S2 = toggle switch, 0.1’’ pitch
PCB # 150057-1
PCB with SMD parts preassembled: Elektor Store # 150057-91

Connection Module (fit one only):
Mod1 = HC-06/-05 Bluetooth breakout module
- soldered straight onto board
Mod2 = HC-06/-05 Bluetooth ZigBee-shaped module
Mod2 = RN41XVC Bluetooth module
Mod2 = RN171 WLAN module (with wire antenna)
- mount onto two 10-way pinheader receptacles, 2mm pitch
Mod3 = Android Breakout-Board (Elektor Store # 130516-91)
- mount onto two 10-way pinheader receptacles, 0.1’’ pitch
Mod4 = ESP8266 WiFi module (2x4-pin connection)
- mount onto 2x3-way pinheader receptacles, 0.1’’ pitch
Mod5 = FT232R USB/Serial Bridge BoB (Elektor Store # 110553-91)
- mount onto 3-way pinheader receptacle, 2.5mm pitch (3-pin pinheader on BoB)
Mod6 = HC-06 module (6-pin version)
- mount onto 6-pin pinheader receptacle, 0.1’’ pitch
Mod7 = BL600 E-BoB (Elektor Store # 140270-91)
- mount onto two 8-way pinheader receptacles, 0.1’’ pitch

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