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Acoustic vertical speed indicator

Whistles from on high

Acoustic vertical speed indicator
The acoustic vertical speed indicator (VSI) described here provides an RC model glider pilot with information about the rate of climb (or descent) of the craft.
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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.

Transmitter
Resistors
(all 0805 SMDs)
R1,R3 = 47kΩ
R2 = 500Ω SMD preset (4 mm)
R4 = 56kΩ
R5 = 1kΩ
R6 = 1kΩ5
R7,R9,R11–R15,R17 = 10kΩ
R8 = 5kΩ6
R10 = 100kΩ
R19 = 100Ω
R16 = 1Ω
R18 = 75Ω
R20 = 1MΩ
Capacitors
C1,C5,C9 = 10µF
C2,C3,C4,C6,C10,C11,12 = 100nF
C7 = 68µF
C8 = 680nF
C13 = 10nF
Semiconductors
D1 = BAT54
T1 = FDV301N
IC1 = 78M05CKTPR
IC2 = MPX5100AP (ABS pressure sensor, 16.68 psi MAX.)
IC3 = ATtiny-15 (Atmel), programmed, order code 060044-41)
IC4 = AD8040ARZ (SMD)
Miscellaneous:
JP1–JP4 = 2-way SIL pinheader
K1 = 2-way PCB terminal block, 5 mm lead pitch
K2 = 3-way SIL pinheader
ANT1 = Splatch SMD aerial (ANT-433-SP-ND from LINX)
BZ1 = 5 V sounder, 12 mm diameter, e.g. PB-12N23P-03Q (Mallory 12 mm)
MOD1 = TXM-433-LC (LINX)
PCB, order code 060044-1 from Elektor SHOP

Receiver
Resistors
R1 = 2Ω7
R2 = 5kΩ9
R3 = 10kΩ
R4 = 200Ω
R5 = 47kΩ
R6 = 12kΩ
R7 = 4kΩ7
P1 = 100kΩ potentiometer
Capacitors
C1,C2,C6,C9, C11 = 100nF
C3 = 100µF
C4 = 6n8F
C5 = 470nF
C7,C10 = 3nF3
C8,C12 = 10µF
C13 = 100nF
Semiconductors
IC1 = µA78M05CKC
IC2 = LM380N-8
IC3 = TL084CN
Miscellaneous
ANT1 = ANT-433-CW-HWR-RPS (LINX)
K1 = 2-way PCB terminal block, 5 mm lead pitch
K2 = 3.5 mm stereo jack socket
K3 = SMA socket, PCB mount, right angled, Digikey # ACX1231-ND
LS1 = miniature loudspeaker (CMS0231KLX)
MOD1 = RXM-433-LC-S
PCB, order code 060044-2 from Elektor SHOP
Software, file # 060044-11.zip
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