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USB Tilt Sensor

(Summer Circuits 2010 article)

USB Tilt Sensor
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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Materials

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

Component list

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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