• on Test & Measurement
  • Published in issue 7/2010 on page 62
About the article

USB Tilt Sensor

(Summer Circuits 2010 article)

USB Tilt Sensor

A tilt sensor is a very versatile device: for example, it can be used as a (game) controller or as an alarm sensor to protect valuables. The circuit described here uses the same sensor as we used in our two-axis accelerometer project: Freescale MMA7260Q

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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.

Resistors
R1,R2,R3 = 1kOhm (0805)
R4 = 47Ohm (0805)
P1 = 5kOhm trimpot (SMT)

Capacitors
C1 = 1µF 50V (0405)
C2–C5,C7,C8,C9 = 100nF (0805)
C6 = 10nF (0805)

Inducotors
L1,K2,L3 = 10µH (ferrite bead 330Ohm, 0805)

Semiconductors
IC1 = FT232RL (SSOP-28)
IC2 = ATmega8-16AU (TQFP-32), programmed, order code 070829-41
MMA7260QT on carrier board, order code 090645-91

Miscellaneous
LCD1 = Displaytech 162A
8-way SIL socket strip for LCD1, lead pitch 0.1 inch (2.54mm)
K1 = 2 pcs 4-pin pinheader, lead pitch 0.1 inch (2.54mm)
K2 = Mini-USB socket, type B
K3 = 6-pin (2x3) pinheader, lead pitch 0.1 inch (2.54mm)
S1–S4 = pushbutton (through-hole)
X1 = 4MHz ceramic resonator with integrated capacitors (SIL-3)
PCB, order code 070829-1
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