2 layers17.1 × 22.1 mm
VarioSmooth v1
samp38/varioSmooth
Energy self-sufficient helmet embedded variometer for free flight
28 parts1
4 layers18.5 × 25.3 mm
VarioSmooth v2
samp38/varioSmooth1Energy self-sufficient helmet embedded variometer for free flight
- Size
- 18.5 × 25.3 mm
- Copper layers
- 4
- Thickness
- 0.79 mm
- Parts
- 30
- Nets
- 65
- Pads
- 128
- Tracks, vias
- 214, 52
- Pours
- 8
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 6 Sep 2017
- Updated
- 4 Nov 2026
Overview
VarioSmooth v2 is an open-source printed circuit board by samp38, from the samp38/varioSmooth repository on GitHub. It is a 4-layer board of 18.5 × 25.3 mm with 30 parts on 65 nets, routed with 214 tracks and 52 vias.
It is built around the MDBT50Q-P1MV2, MS5611-01BA03 and BAT54WS. Its parts include 6 capacitors, 5 resistors, 3 ICs, 2 diodes and 1 switch. It belongs with the nRF52 and nRF5x boards of this library.
Main components
3
MDBT50Q-P1MV2
SMD-61PEncryption function、Mesh networking SMD-61P Bluetooth Modules ROHSRAYTACBluetooth Modules
MS5611-01BA03
QFN-8(3x5)QFN-8(3x5) Pressure Sensors ROHSMEASPressure Sensors
BAT54WS
SOD-3231 Independent 100mA 1V@100mA 2uA@25V 30V 600mA SOD-323 Schottky Diodes ROHSDiodes IncorporatedSchottky Diodes
README
README.mdVarioSmooth
Lightweight, solar powered, helmet embedded audio variometer for free flight.
- v1 (2017): PIC24F16KA101 + MS5611, LTC4071 solar charger, 22 × 17 mm PCB. Firmware (MPLAB X / XC16), PCB (Eagle, ported to KiCad 10), docs and open issues.
- v2 (in progress): nRF52840 (Raytac MDBT50Q) with Bluetooth LE, sends barometric altitude and vario to XCTrack / LK8000. Firmware with PlatformIO, flex PCB.
Parts
30| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 10u | Capacitor_SMD:C_0603_1608Metric | C1, C2, C3 |
| 2 | 12p | Capacitor_SMD:C_0603_1608Metric | C5, C6 |
| 2 | 4.7k | Resistor_SMD:R_0603_1608Metric | R5, R6 |
| 2 | BAT54WS | Diode_SMD:D_SOD-323 | D1, D2 |
| 1 | 100n | Capacitor_SMD:C_0603_1608Metric | C7 |
| 1 | 10u | Inductor_SMD:L_0603_1608Metric | L1 |
| 1 | 1k | Resistor_SMD:R_0603_1608Metric | R7 |
| 1 | 200 | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | 220 | Resistor_SMD:R_0603_1608Metric | R8 |
| 1 | 32.768kHz | Crystal:Crystal_SMD_3215-2Pin_3.2x1.5mm | Y1 |
| 1 | 3V3 | TestPoint:TestPoint_Pad_D1.5mm | TP4 |
| 1 | Battery_Cell | varioSmooth_v2:WirePad_1x02_SMD_P2.54mm | BT1 |
| 1 | G | TestPoint:TestPoint_Pad_D1.0mm | TP7 |
| 1 | GND | TestPoint:TestPoint_Pad_D1.5mm | TP5 |
| 1 | KPEG006 | varioSmooth_v2:WirePad_1x02_SMD_P2.54mm | BZ1 |
| 1 | LTC4071xMS8E | Package_SO:MSOP-8-1EP_3x3mm_P0.65mm_EP1.68x1.88mm | U2 |
| 1 | MDBT50Q-P1MV2 | RF_Module:Raytac_MDBT50Q | U3 |
| 1 | MS5611-01BA | Package_LGA:LGA-8_3x5mm_P1.25mm | U4 |
| 1 | RESET | TestPoint:TestPoint_Pad_D1.5mm | TP3 |
| 1 | RST | TestPoint:TestPoint_Pad_D1.0mm | TP6 |
| 1 | SWDCLK | TestPoint:TestPoint_Pad_D1.5mm | TP2 |
| 1 | SWDIO | TestPoint:TestPoint_Pad_D1.5mm | TP1 |
| 1 | SW_Push | varioSmooth_v2:WirePad_1x02_SMD_P2.54mm | SW1 |
| 1 | Solar_Cells | varioSmooth_v2:WirePad_1x02_SMD_P2.54mm | SC1 |
| 1 | VIN | TestPoint:TestPoint_Pad_D1.5mm | TP8 |
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Questions
How big is the VarioSmooth v2 PCB?
It measures 18.5 × 25.3 mm and has 4 copper layers, 0.79 mm thick.
What parts does the VarioSmooth v2 use?
30 parts, built around the MDBT50Q-P1MV2, MS5611-01BA03 and BAT54WS. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the VarioSmooth v2 KiCad files?
From the samp38/varioSmooth repository on GitHub, at the commit this page was made from: the board is v2/pcb/kicad/varioSmooth_v2/varioSmooth_v2.kicad_pcb and its schematic v1/pcb/kicad/varioSmooth_v1/Vario_0.1_Ultra_Mini_2.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the VarioSmooth v2 design in my own project?
Its repository states no licence, so its author keeps all rights: ask samp38 before reusing the design.