About the article

ATM18 AVR Board

Small but perfectly formed

ATM18 AVR Board
This new series of articles presents a tiny processor module based on an ATmega88 microcontroller, ideal for use at the heart of any number of different projects. We begin with a reaction time tester and quickly move on to more advanced projects such as a precision weather station and a 3D magnetometer. Each application example provides an easy-to-understand demonstration of how to work with AVR microcontrollers.
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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.

Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Component list

ATM18 controller module
Resistors (SMD 805)
R1 = 10 Ohm

R2 = 10k
Capacitors (SMD 805)
C1,C2,C3 = 4µF7 6.3 V (Farnell # 922-7857)
C4,C5 = 22pF
IC1 = ATmega88 (TQFP32 case), Atmel)
Q1 = 16MHz quartz crystal, SMD (7mm x 5mm)
3x 8-way pinheader, 2mm lead pitch
1x 5-way pinheader, 2mm lead pitch
PCB, ref. 071035-1 (track layouts free download from www.elektor.com)
PCB, ready populated with SMDs, tested, including pinheaders, Elektor-Shop # 071035-91

ATM18 test board
Resistors (SMD 805)
R1 = 10 Ohm

R2,R4,R6,R8,R10…R13 = 330 Ohm

R3,R5,R7,R9 = 10k

C1,C2,C3 = 47µF 16V (SMD7343-43, Farnell # 498-762)
C4,C5,C6 = 4µF7 6.3 V (SMD 805, Farnell # 922-7857)

L1 = 100µH (SMD2220, Epcos # B82442A1104K)
D1,D2 = MBRS130 (BYS10), DO214-AC (Farnell # 995587)
LED1 = SMD0603-LED, green (Farnell # 852-9833)
LED2-LED8 = SMD0603 LED, red (Farnell # 852-9868)
IC1 = LM2594-5.0, SO8 (National Semiconductor)
IC2 = ULN2003AD, SO16
K1 = mains adapter socket, PCB mount, Lumberg NEB21R (Farnell # 1217037)
K2 = SIL pinheader, 6-way, angled pins
K3 = SIL socket pinstrip, 7-way
K4 = SIL socket pinstrip, 8-way
K5 = SIL socket pinstrip, 9-way
K6 = SIL socket pinstrip, 5-way
K7 = double-row pinheader, 6-way,
K8 = double -row pinheader, 16-way
K9 = SIL pinheader, 5-way
K10 = SIL socket pinstrip, 7-way
K11 = SIL pinheader, 7-way
K12 = socket pinstrip, 3-way
JP1, JP2 = pinheader, 2-way
JP6 = pinheader, 3-way
SW1-SW4 = pushbutton, SPNO-B3S series, Omron (Farnell # 118-1016)
PCB, ref. 071035-2, track layouts free download from www.elektor.com
SMD-populated board and all parts, # 071035-92 from the Elektor Shop
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