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Wireless Gateways

From serial to radio, and back again

Wireless Gateways
Tiny low power radio (LPR) modules operating at UHF ISM frequencies like 433 MHz and 868 MHz are available on the market that are ideal for remote measurement and control applications. They are usually controlled over an SPI interface. Poring over datasheets and writing a driver is, however, not everyone’s delight, and we have therefore designed a small board that carries an LPR module along with an ATmega328 microcontroller and a serial interface. Pre-programmed firmware allows the board to be used as a simple gateway for strings of characters between the serial interface and the ether.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor 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. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Components
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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.
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COMPONENT LIST
Resistors
R1,R4 = 1kOhm (0805)
R2 = 10kOhm (0805)
R3 = 2kOhm (0805)
R5,R7,R9,R11,R13,R15,R17,R19 = 1.8kOhm (0603)
R6,R8,R10,R12,R14,R16,R18,R20 = 3.3kOhm (1%, 0603)
Capacitors
C1,C2 = 22pF (0805)
C3..C7 = 100nF (0805)
C8 = 4.7µF (0805)
C9 = 10µF, 25V (1206)
C10,C11 = 1µF (0603)
Semiconductors
D1 = LED yellow (0805)
D2 = LED green (0805)
D3 = PMEG2010AEH Schottky diode (SOD-123F)
IC1 = ATmega328P-AU, programmed (TQFP-32)
IC2 = LDO NCP5501DT50G (DPAK-3)
IC3 = XC6206P332MR (SOT-23-3)
Miscellaneous
K1 = 10-pin (2x5) pinheader, 0.1’’ pitch
K2 = 6-pin (2x3) pinheader, 0.1’’ pitch
K3 = 2-pin pinheader, 0.1’’ pitch
JP1 = 3-pin pinheader, 0.1’’ pitch with jumper
S1 = pushbutton
X1 = 16MHz quartz crystal, 50ppm, 18pF
MOD1 = RFM12B-433-S1 radio module (HopeRF)
14-pin pinheader, 2mm lead pitch
14-way receptacle. 2mm pitch
PCB # 130023-1

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