2 layers51.7 × 75 mm
Relay board
waterloo-rocketry/rlcsv3
Arduino code and electrical schematics for Waterloo Rocketry Remote Launch Control System V3
45 parts5MIT
2 layers45 × 75 mm
Relay board
waterloo-rocketry/rlcsv35Arduino code and electrical schematics for Waterloo Rocketry Remote Launch Control System V3
- Size
- 45 × 75 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 51
- Nets
- 35
- Pads
- 145
- Tracks, vias
- 502, 34
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 17 Nov 2017
- Updated
- 4 Nov 2026
Overview
Relay board is an open-source printed circuit board by waterloo-rocketry, from the waterloo-rocketry/rlcsv3 repository on GitHub, published under the MIT licence. It is a 2-layer board of 45 × 75 mm with 51 parts on 35 nets, routed with 502 tracks and 34 vias.
It is built around the MMBF170. Its parts include 16 resistors, 7 ICs, 7 diodes, 4 capacitors and 4 connectors. It belongs with the home automation and IoT boards and the PIC boards of this library.
Main components
1README
README.mdRemote Launch Control System
RLCS stands for Remote Launch Control System. It's purpose is to fill our rocket with ethanol and nitrous oxide, then ignite the ignition puck inside the rocket, all from a distance of 3000' away at launch control. To do so, it has control over multiple valves at the rocket, a linear actuator to disconnect the fill arm from the rocket, and 2 ignition coils inside the ignition puck.
Repository Layout
All Arduino firmware code is in /src
All electrical schematics and PCB layouts are in /schematics
Parts
51| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | D | Diode_SMD:D_SMB_Handsoldering | D1, D2, D3, D4, D6, D7 |
| 5 | 10K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R8, R10, R11, R12, R13 |
| 4 | 10k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2, R3, R4 |
| 4 | MountingHole_3.2mm_M3_Pad | MountingHole:MountingHole_3.2mm_M3_Pad | , , , |
| 4 | TEST_1P | custom:Socket_Strip_Straight_1x01_Pitch2.54mm | TP0, TP1, TP2, TP3 |
| 3 | 0.1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C2, C3, C4 |
| 2 | 0.01 | Resistor_SMD:R_2512_6332Metric_Pad1.40x3.35mm_HandSolder | R14, R15 |
| 2 | 150 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R5, R6 |
| 2 | 20K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R7, R9 |
| 2 | ACT_PWR | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | P1, P2 |
| 2 | CONN_01x05 | Connector_JST:JST_XH_S5B-XH-A-1_1x05_P2.50mm_Horizontal | U5, U7 |
| 2 | INA180A1 | Package_TO_SOT_SMD:SOT-23-5_HandSoldering | U4, U6 |
| 2 | MMBF170 | Package_TO_SOT_SMD:SOT-23_Handsoldering | Q1, Q2 |
| 1 | 180 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R16 |
| 1 | 22uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1 |
| 1 | ACTUATOR | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-6_1x06_P5.00mm_Horizontal | P3 |
| 1 | BLUE 3.2V 10mA | LED_SMD:LED_1206_3216Metric_Pad1.42x1.75mm_HandSolder | D5 |
| 1 | FUSE | custom:littlefuse_01000020Z | F1 |
| 1 | LOGO | rlcs:rocketry_logo_small | G*** |
| 1 | PIC16F1826-ISO | custom:PIC16F1826-ISO | U2 |
| 1 | Programming Header | custom:PinHeader_5x2.54_SMD_90deg_952-3198-1-ND | J1 |
| 1 | SPST_POWER_RELAY | custom:Relay_SPST_G5LE-1A | U1 |
| 1 | SW_DIP_x04 | custom:DIP_SWITCH_4X2 | SW1 |
| 1 | dpdt_relay | custom:Relay_DPDT_RT424012F | U3 |
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Questions
How big is the Relay board PCB?
It measures 45 × 75 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Relay board use?
51 parts, built around the MMBF170. 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 Relay board KiCad files?
From the waterloo-rocketry/rlcsv3 repository on GitHub, at the commit this page was made from: the board is schematics/relay_board_schematics/relay_board.kicad_pcb and its schematic schematics/can_support_schematics/Hardwired CAN support.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Relay board design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).