2 layers65.2 × 144.9 mm
LECV2.0 Main Board
MSTRocketDesignTeam/Liquid-Engine-Controller
Evolution of the RDT's Custom Liquid Engine Control Unit!
64 parts2AGPL-3.0
4 layers152.9 × 77.2 mm
Evolution of the RDT's Custom Liquid Engine Control Unit!
- Size
- 152.9 × 77.2 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 71
- Nets
- 65
- Pads
- 288
- Tracks, vias
- 373, 252
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 8 Sep 2024
- Updated
- 27 Oct 2026
Overview
LEC is an open-source printed circuit board by MSTRocketDesignTeam, from the MSTRocketDesignTeam/Liquid-Engine-Controller repository on GitHub, published under the AGPL-3.0 licence. It is a 4-layer board of 152.9 × 77.2 mm with 71 parts on 65 nets, routed with 373 tracks and 252 vias.
It is built around the MAX31855KASA+T, W25Q128JVSIQ and L78L33ACZ, with the L7805 among its other parts. Its parts include 26 capacitors, 16 resistors, 14 connectors, 9 ICs and 1 diode. It belongs with the RP2040 boards of this library.
Main components
4
MAX31855KASA+T
SO-8-40℃~+125℃ 14 1500uA 3V~3.6V Built-in temperature sensor SPI Thermocouple-to-Digital Converter SO-8 ADCs/DACs - Special Purpose ROHSMaxim Integrated (Analog Devices)ADCs/DACs - Special Purpose
W25Q128JVSIQ
SOIC-8-208mil-40℃~+85℃ 100,000 cycles 120ms@(32KB) 128Mbit 133MHz 1uA 2.7V~3.6V 20 Years 3ms Power-on reset、Hardware write protection、Software write protection、Write enable latch、Absolute write protection SPI SOIC-8-208mil NOR FLASH ROHSWinbondNOR FLASH
L78L33ACZ
TO-92-30℃~+125℃@(Tj) 1 100mA 2V 3.3V 30V 40uV 49dB@(120Hz) 6mA Fixed Over Current Protection、Over Temperature Protection、Short Circuit Protection Positive TO-92-3 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSSTMicroelectronicsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
L7805
TO-220ST0℃~+125℃@(Tj) 1 1.2A 20V 2V@(1A) 42uV 500uA 5V 73dB@(120Hz) Fixed Positive Short Circuit Protection TO-220ST Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSOSENVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
README
README.md
*This repo is intended for educational purposes only*
SRAD Engine Controller
A student researched and designed (SRAD) engine controller for the liquid bipropellant rocket.
About
This project is the first iteration of the flight controller for the Rocket Design Team's (RDT) liquid bipropellant rocket. It aims to provide basic engine control functionality, such as opening and closing of the servo ball valves (SBV), as well as to set the hardware baseline for more advanced control functionality like throttling algorithms for flight efficiency. Additionally, the Liquid Engine Controller (LEC) aims to serve as the data acquisition computer for the propulsion system, in order to analyze the performance of the propulsion system.
Documentation
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Development
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File Structure
This repo contains three main sections, hardware, firmware, and software.
Hardware:
The hardware directory will contain all of the files related to the design and assembly of the PCBs. This includes KiCad projects as well as BOMs.
Firmware:
The firmware directory will contain all of the code (C++) necessary to operate the above hardware. Once the boards have been designed and assembled this is where significant effort will be made.
Software:
The software directory will contain the code (Python) for the LEC's computer interface. This program will be responsible for configuring the LEC prior to launch as well as for displaying live propulsion system state data from the launch pad.
Future developments may allow for preflight simulations (FEA / CFD of engine, estimated throttling curve, etc.).
Parts
71| Qty | Value | Footprint | References |
|---|---|---|---|
| 16 | 10K | Resistor_SMD:R_0603_1608Metric | R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, R16 |
| 12 | 54-00278 | M8Connector:TENSILITY_54-00278 | J1, J2, J3, J4, J5, J6, J7, J8, J11, J12, J13, J14 |
| 11 | 100n | Capacitor_SMD:C_1206_3216Metric | C1, C2, C4, C5, C6, C7, C8, C9, C15, C16, C17 |
| 10 | 10u | Capacitor_SMD:C_0805_2012Metric | C12, C13, C14, C18, C19, C20, C21, C22, C24, C25 |
| 3 | 100n | Capacitor_SMD:C_0603_1608Metric | C3, C10, C11 |
| 2 | 10n | Capacitor_SMD:C_0603_1608Metric | C23, C26 |
| 2 | Conn_01x02 | Connector_AMASS:AMASS_XT30UPB-M_1x02_P5.0mm_Vertical | J9, J10 |
| 2 | L78L33ACZ | L78L33ACZ:TO-92-TR_STM | U7, U8 |
| 2 | MAX31855KASA | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U5, U6 |
| 1 | 1N5817 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D1 |
| 1 | L7805 | L7805CV:TO-220_STM | U2 |
| 1 | LOGO | RDTLogo:RDT_Logo | G*** |
| 1 | MC7809CTG | MC7809CTG:TO-220AB_ONS | U3 |
| 1 | MCP3564RT-E/ST | MCP3564R/T:TSSOP20_ST_MCH | U15 |
| 1 | Pico | RPiPico:RPi_Pico_SMD_TH | U1 |
| 1 | W25Q128JVSIQ | W25Q128JVSIQ:SOIC_128JVSIQ_WIN | U4 |
The 67 most common of 71 parts.
Questions
How big is the LEC PCB?
It measures 152.9 × 77.2 mm and has 4 copper layers, 1.6 mm thick.
What parts does the LEC use?
71 parts, built around the MAX31855KASA+T, W25Q128JVSIQ, L78L33ACZ and L7805. 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 LEC KiCad files?
From the MSTRocketDesignTeam/Liquid-Engine-Controller repository on GitHub, at the commit this page was made from: the board is oldRevisions/LECrevA/hardware/LEC/LEC.kicad_pcb and its schematic _archive/hardware-leviathan/DAQ_HAT/DAQ_HAT.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the LEC design in my own project?
Its repository publishes it under the AGPL-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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