Super Servo Tester

Test Up to Four Servos Stand-Alone or In-System

Labs Project

Based on a Labs project | January 2022 | Find it here

I developed the Super Servo Tester presented here because the drone I am working on sometimes produces an unpleasant smell of burned electronics and scorched copper varnish during test flights. I needed a tool to diagnose the problem and to help me understand the cause of the issues.

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Materials

Joop Brokking’s drone website

OLED_I2C library

Project downloads at Elektor Labs

Component list

Component List

[Illustration 220069-032-94]

[Illustration 220069-031-94]

Resistors (THT, 0.25 W, 5%)
R1, R3 = 1 kΩ
R2, R4, R5, R6, R7, R9, R10 = 10 kΩ
R8 = 22 Ω
P1, P2, P3, P4 = 10 kΩ, linear, vertical

Capacitors (THT)
C1 = 100 µF, 35 V, 8 mm diam., 3.5 mm pitch
C2 = 10 µF, 16 V, 5 mm diam., 2 mm pitch
C3, C4, C7 = 100 nF, 2.5 mm or 5 mm pitch
C5, C6 = 22 pF, 2.5 mm pitch

Semiconductors (THT)
D1 = 1N5817
D2 = LM385Z-2.5, TO-92
D3 = BZX79-C5V1
IC1 = 7805, TO220
IC2 = ATmega328-P
LED1 = LED, 3 mm, red
T1 = 2N7000, TO-92

Miscellaneous (THT)
BUZ1 = Piezo buzzer with oscillator, 12 mm diam., 6.5 mm or 7.6 mm pitch
K1, K2 = 2-row, 12-way pinheader, 2.54 mm pitch, 90°
K5 = Barrel jack
K4* = 4-way pin socket, 2.54 mm pitch (mount A or B depending on display)
K3 = 2-row 6-way boxed pinheader, 2.54 mm pitch
S1 = Slide switch DPDT, 90° (e.g. MFS201N-16-Z)
S2 = Slide switch SPDT, 90° (e.g. OS102011MA1)
X1 = Crystal, 16 MHz, HC-49S (low-profile)

OLED display, 0.96", 128 x 32 pixels, 4-pin I²C (e.g. www.elektor.com/18747)
Elektor PCB 220069-1

Suggested enclosure: Hammond 1593N

* = see text