2 layers167.9 × 105.9 mm
2 layers92.2 × 64.5 mm
Control
cuspaceflight/OkGo3Rocket motor ignition and valve control from far, far away
- Size
- 92.2 × 64.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 80
- Nets
- 64
- Pads
- 277
- Tracks, vias
- 1,171, 97
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 25 Nov 2012
- Updated
- 31 Aug 2017
Overview
Control is an open-source printed circuit board by cuspaceflight, from the cuspaceflight/OkGo repository on GitHub. It is a 2-layer board of 92.2 × 64.5 mm with 80 parts on 64 nets, routed with 1,171 tracks and 97 vias.
It is built around the STM32F071CBT6, RFM95W and BSS138BK. Its parts include 25 resistors, 14 capacitors, 10 connectors, 9 diodes and 6 ICs. It belongs with the STM32 boards of this library.
Main components
3
STM32F071CBT6
LQFP-48(7x7)-40℃~+85℃ 1.65V~3.6V 128KB 12bit 12bit 16KB 32 Bit 37 48MHz ARM Cortex-M0 Built-in FLASH LQFP-48(7x7) Microcontrollers (MCU/MPU/SOC) ROHSSTMicroelectronicsMicrocontrollers (MCU/MPU/SOC)RFM95W
SMD-16PUncategorisedHopeRF Micro-electronics
BSS138BK
SOT-23-55℃~+150℃ 1 N-channel 1.6V 1.6Ω@10V 350mW 360mA 56pF 60V 700pC@4.5V N-Channel SOT-23 MOSFETs ROHSNexperiaMOSFETs
README
README.mdOkGo
OkGo is Cambridge University Space Flight's rocket firing controller.
OkGo was designed for testing the Quasar hybrid rocket motor. It allowed remote (over 100m of wire) control of the nitrous oxide valve and firing of the ignition e-match. It was constructed using an ad-hoc point-to-point layout. An entirely passive design, it simply uses mechanical switches to trigger relays. It was later upgraded to control two valves, one of which passed a low flow of nitrous oxide to help start the motor.
OkGo 2 was a full redesign for the launch of Martlet 2. Due to the increased safety radius (on the order of 500m) radio control is to be used. It will have 4 general purpose (valve or e-match) channels with independent continuity checking and firing, and separate firing boxes containing current limiting resistors.
OkGo 3 is another full redesign for the launch of Martlet 3. It will continuity check and ignite a single channel with a constant-current drive. Ignition and control will be small and light for portability.
Parts
80| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 10k | Resistors_SMD:R_0805 | R101, R106, R107, R108, R109, R110, R205, R206, R211, R212 |
| 5 | 100n | Capacitors_SMD:C_0805 | C101, C102, C104, C108, C112 |
| 5 | TVS_small | Resistors_SMD:R_0603 | D101, D103, D104, D105, D106 |
| 4 | 100k | Resistors_SMD:R_0805 | R203, R204, R209, R210 |
| 4 | 180R | Resistors_SMD:R_0805 | R201, R202, R207, R208 |
| 4 | BSS138BK | Housings_SOT-23_SOT-143_TSOT-6:SOT-23 | Q201, Q202, Q203, Q204 |
| 4 | VAL** | common:M3_MOUNT | M3_MOUNT, M3_MOUNT, M3_MOUNT, M3_MOUNT |
| 3 | R | Resistors_SMD:R_0805 | R111, R112, R113 |
| 2 | 15p | Capacitors_SMD:C_0805 | C109, C110 |
| 2 | 2u2 | Capacitors_SMD:C_0805 | C113, C114 |
| 2 | 4u7 | Capacitors_SMD:C_0805 | C103, C105 |
| 2 | RED | LEDs:LED-0805 | D107, D110 |
| 1 | 100R | Resistors_SMD:R_0805 | R102 |
| 1 | 100u | Capacitors_SMD:C_1206 | C111 |
| 1 | 10n | Capacitors_SMD:C_0805 | C106 |
| 1 | 1u | Capacitors_SMD:C_0805 | C107 |
| 1 | 20k LIN | control:bourns3386G | RV101 |
| 1 | 3k3 | Resistors_SMD:R_0805 | R105 |
| 1 | 3v3 | common:TESTPOINT | TP102 |
| 1 | 75R | Resistors_SMD:R_0805 | R103 |
| 1 | 8MHz | common:XTAL50x32 | Y101 |
| 1 | ADP3335 | control:MSOP-8_3x3mm_Pitch0.65mm | U107 |
| 1 | ARM_LED | common:JST-PA-2 | P106 |
| 1 | BATT | common:JST-PA-2 | P105 |
| 1 | CH1 | common:JST-PA-4 | P201 |
| 1 | CH2 | common:JST-PA-4 | P202 |
| 1 | CH3 | common:JST-PA-4 | P205 |
| 1 | CH4 | common:JST-PA-4 | P206 |
| 1 | GREEN | LEDs:LED-0805 | D108 |
| 1 | KEYSW | common:JST-PA-2 | P102 |
| 1 | LCD_HD44780 | control:LCD_MC42004A6W_bare | U106 |
| 1 | LOGO | common:cusf_logo | G*** |
| 1 | LOGO | control:wile-e-plunger | G*** |
| 1 | LOGO | common:cusf_logo_full | G*** |
| 1 | POWER_SW | common:JST-PA-2 | P110 |
| 1 | PTC | control:polyfuse0805 | F101 |
| 1 | RFM95W | common:RFM95W | U105 |
| 1 | R_Small | Resistors_SMD:R_0805 | R104 |
| 1 | SERIAL | common:JST-PA-4 | P111 |
| 1 | SMA | common:SMA-142-0701-801 | P108 |
| 1 | STM32F071CBT6 | common:LQFP48_ST | U102 |
| 1 | SWD | common:FTSH-105-01-F-D-K | U101 |
| 1 | YELLOW | LEDs:LED-0805 | D109 |
| 1 | nRST | common:TESTPOINT | TP101 |
| 1 | pololu_S7V7F5 | control:polulo_S7V7F5 | U103 |
Questions
How big is the Control PCB?
It measures 92.2 × 64.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Control use?
80 parts, built around the STM32F071CBT6, RFM95W and BSS138BK. 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 Control KiCad files?
From the cuspaceflight/OkGo repository on GitHub, at the commit this page was made from: the board is OkGo 2/control/control.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Control design in my own project?
Its repository states no licence, so its author keeps all rights: ask cuspaceflight before reusing the design.
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