leeeeeeeeeeeeee2/arctracka model rocket flight computer
Arctrack is an open-source printed circuit board by leeeeeeeeeeeeee2, from the leeeeeeeeeeeeee2/arctrack repository on GitHub, published under the GPL-3.0 licence. It is a 4-layer board of 40 × 60.5 mm with 55 parts on 60 nets, routed with 1,075 tracks and 121 vias.
It is built around the ESP32-C3FH4, BMP280 and MPU-6050, with the TP4056-42-ESOP8 among its other parts. Its parts include 23 capacitors, 14 resistors, 6 ICs, 5 connectors and 2 inductors. It belongs with the ESP32 and RISC-V boards of this library.
ArcTrack is a compact flight computer for model rockets. It logs altitude and motion to a microSD card, reads GPS, and lets you live-track the rocket over WiFi from your phone. v1.3 adds a power LED, buzzer, and servo header for nose-cone parachute deploy at apogee.
Designed for a BT-70 body tube with a 3D-printed nose avionics bay.
Hardware: bare ESP32-C3FH4 (QFN-32, 4MB flash) + 2.4 GHz chip antenna, USB-C, LiPo charger, 3.3 V regulator, BMP280, MPU-6050, microSD, GPS header, servo + 5 V boost.
RF note: chip-antenna matching may need tuning. See
hardware/DESIGN.md.
| Path | What |
|---|---|
hardware/DESIGN.md | Electrical design, pinout, power, layout |
hardware/BOM.md | Bill of materials |
hardware/WIRING.md | Pin-by-pin wiring |
hardware/kicad/ | PCB project (schematic + board) |
hardware/gerbers/ | Fabrication outputs (when exported) |
firmware/ | PlatformIO firmware for ESP32-C3 |
hardware/DESIGN.md and hardware/WIRING.mdhardware/kicad/hardware/gerbers/ when present.cd firmware
pio run # build
pio run -t upload # flash over USB-C
pio device monitor # serial logsPhone: join WiFi ArcTrack / password launch123, open http://192.168.4.1
| Function | GPIO |
|---|---|
| I2C SDA / SCL | 4 / 5 |
| SD SCK / MOSI / MISO / CS | 6 / 7 / 3 / 10 |
| GPS RX / TX | 20 / 21 |
| Buzzer | 0 |
| Servo PWM | 1 |
| Power LED | hardwired to 3.3 V (not a GPIO) |
Leighton — UK maker / rocketry + electronics builds.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 100n | Capacitor_SMD:C_0402_1005Metric | C1, C2, C4, C5, C7, C8, C9, C10 |
| 6 | 10k | Resistor_SMD:R_0402_1005Metric | R1, R2, R3, R4, R10, R11 |
| 3 | 10u | Capacitor_SMD:C_0805_2012Metric | C16, C17, C18 |
| 2 | 10p | Capacitor_SMD:C_0402_1005Metric | C13, C14 |
| 2 | 10uF | Capacitor_SMD:C_0805_2012Metric | C21, C22 |
| 2 | 1p | Capacitor_SMD:C_0402_1005Metric | C19, C20 |
| 2 | 1u | Capacitor_SMD:C_0402_1005Metric | C11, C12 |
| 2 | 4.7k | Resistor_SMD:R_0402_1005Metric | R8, R9 |
| 2 | 5.1k | Resistor_SMD:R_0402_1005Metric | R5, R6 |
| 1 | 100k | Resistor_SMD:R_0402_1005Metric | R14 |
| 1 | 100uF | Capacitor_SMD:C_0805_2012Metric | C23 |
| 1 | 10n | Capacitor_SMD:C_0402_1005Metric | C3 |
| 1 | 12k | Resistor_SMD:R_0402_1005Metric | R7 |
| 1 | 2.2n | Capacitor_SMD:C_0402_1005Metric | C6 |
| 1 | 2.2uH | Inductor_SMD:L_0402_1005Metric | L2 |
| 1 | 2.7nH | Inductor_SMD:L_0402_1005Metric | L1 |
| 1 | 22u | Capacitor_SMD:C_0805_2012Metric | C15 |
| 1 | 330Ω | Resistor_SMD:R_0402_1005Metric | R12 |
| 1 | 40MHz | Crystal:Crystal_SMD_2012-2Pin_2.0x1.2mm | Y1 |
| 1 | 510k | Resistor_SMD:R_0402_1005Metric | R13 |
| 1 | AMS REG | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U3 |
| 1 | Antenna | RF_Antenna:Johanson_2450AT43F0100 | AE1 |
| 1 | BMP280 | Package_LGA:Bosch_LGA-8_2x2.5mm_P0.65mm_ClockwisePinNumbering | U2 |
| 1 | Buzzer | Buzzer_Beeper:Buzzer_Mallory_AST1109MLTRQ | BZ1 |
| 1 | ESP32-C3FH4 | Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.7x3.7mm | U4 |
| 1 | GPS HEADERS | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J4 |
| 1 | JST BATTERY CONNECTOR | Connector_JST:JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical | J2 |
| 1 | LED | LED_SMD:LED_0402_1005Metric | D1 |
| 1 | MPU-6050 | Sensor_Motion:InvenSense_QFN-24_4x4mm_P0.5mm | U1 |
| 1 | Micro_SD_Card | Connector_Card:microSD_HC_Hirose_DM3AT-SF-PEJM5 | J3 |
| 1 | POWER SWITCH | Button_Switch_SMD:SW_SPDT_PCM12 | SW1 |
| 1 | SERVO | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J5 |
| 1 | SERVO 5V BOOST | Package_TO_SOT_SMD:SOT-23-6 | U6 |
| 1 | TP4056-42-ESOP8 | Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm_ThermalVias | U5 |
| 1 | USBC CHARGE PORT | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J1 |
It measures 40 × 60.5 mm and has 4 copper layers, 1.6 mm thick.
55 parts, built around the ESP32-C3FH4, BMP280, MPU-6050 and TP4056-42-ESOP8. 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.
From the leeeeeeeeeeeeee2/arctrack repository on GitHub, at the commit this page was made from: the board is hardware/kicad/arctrack.kicad_pcb and its schematic hardware/kicad/arctrack.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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