Create PCB for mechanical mounting of 2 key switches. Add simple hard-wired circuit for safety buzzer.

Requirements:
-Work with aerostructres to determine dimensions
-Hard wired circuit for safety buzzer.
-Key switch part number: Z5840-ND

DC Motor and servo control circuit development for future years:
Max power: 12V 2A (24W)

Requirements:
-Multiple H Bridges
-Forward/Reverse, speed control
-Position/location feedback
-Opto-isolated signals, fuses from main power rail.
-Possible 3 phase support

Implement nosecone board with barometer.

Requirements:
-Consult with Aerostructures to choose appropriate barometer
-Consult with Aerostructures to choose PCB dimensions
-Implement the RS485 circuit previously designed
-Implement a basic battery system (Linear regulator will work)
-Find PCB connectors

Parachute Deployment PCB

The purpose of the Parachute Deployment PCB is to ignite the e-matches when the signal is sent by the MCU. Since the e-matches are external to the avionics bay they must be isolated from ESD events using a coupler. A high side PMOSFET is used.

Power =12V
GPIO voltage = 3.3V

Specs:

1. GPIO 22 when high ignites Ematch 1
2. GPIO 23 when high ignites Ematch 2
3. PMOS are TSM085P03CS_A1703
4. Opto couplers are AQY280EH (4 dip variant)
5. Resistors are to be 0805 imperial
6. Capacitors are to be 0805 imperial
7. Power trace widths: 2.2 mm
8. Digital trace widths: 0.254 mm (10 mil)

Steps:
0. Download REVB of Deployment board form work in progress folder.

1. Create footprints for PMOS and optocoupler:
   Lots of yourube tutorials on this.
   Symbols already created :)
   

See data sheets:
Optocoupler:

PMOSFET:

2. Add the newly created parts to the schematic (placeholder parts shown in diagram)
   Also calculate require resistor values
   

3. Layout PCB
   

• Re-route & clean up traces on PCB from completed schematic.

• Move GPS from SEN REVA to this schematic.
• Change edge mount SMA connectors to 90deg connectors
• Re-route all digital and power pins to new header mapping

Create PCB with pi-match, sma connector, and footprint for 0433AT62A0020E 433MHz antenna.

BOM:
712-1568-2-ND
A97594-ND
0805 Pi match, values to be tuned later.

Create different connector footprints for:

https://www.digikey.ca/product-detail/en/M80-5100642/952-1008-5-ND/2263997/?itemSeq=340546195
https://www.digikey.ca/product-detail/en/M80-5102042/952-1011-5-ND/2264000/?itemSeq=340546193
https://www.digikey.ca/product-detail/en/LD15S24A4GV00LF/609-5195-ND/4997304/?itemSeq=340546191

Implement mechanical fasteners in place of crimp terminals for the top battery board.

October 2020

• Re-map digital and power pins on sensor board to different spots on header.
• Remove GPS

Implement RS485 circuit to communicate with nosecone:

Requirements

• Pick RS485 controller that can be controlled via UART I2C, or SPI (consult with Sam Dewan)
• RS485 line should be opto-isolated
• Create RS485 driver for the SAMD21 (software)
• Circuit will be implemented on nosecone board, and Connector board in main avionics bay. Circuit can be drawn as a design block in EAGLE

We need to build two PCBs that go in our battery sandwich. They will have a mixture of spring contacts and flat contacts so that each of the ten batteries in the stack are held between on of each type of contact. The traces on the boards will need to be designed such that all of the batteries are connected in series.

We also have to decide how exactly we will connect the battery sandwich to the rest of the rocket. We will either need to find a suitable connecter or use something like crimp terminals to connect the battery wires directly to the sandwich.

Battery Sandwich Schematic
Battery Sandwich Battery Locations
Battery Contacts

The ground station board needs to be revised to fit into the new launch console case. We will also be re-evaluating the design of last year's design due to packet loss that was noted during testing of the old board. Please create a project titled GND_REVB in 2022-2023 PCBs Work In Progress. You will need to create one or more schematic files. When you have finished with the schematic , you will then need to import your changes to a copy of the GEN2 PCB file in your project and create the PCB layout.

Mechanical Requirements:
The PCB shall be designed to be connected to a 3D Printed enclosure that will bolt into the new launch console.
The coaxial SMA male connector shall be affixed to the board in such a way that a cable can be affixed to the board and connected at the other end to an antenna.
The PCB shall be no greater than 100mm x 100mm.

Electrical Requirements:
The circuitry of the old ground station worked well in theory. In practice, significant packet loss was noted. I would advise you evaluate the design of last year's ground station, checking datasheets and consulting resources on the design of transmission lines where appropriate. Areas of interest would be transmission lines and decoupling capacitors. You should also consult REVD of the radio board to see how a RN2483-A transceiver can be successfully implemented.
There are two main components to this board:

1. UART to USB interface IC
2. RN2483-A Transceiver chip (controlled by the UART to USB IC)