C-grandy/MATEFloatA PCB & Code for the VHS 2024 MATE Float
MATE ROV Float is an open-source printed circuit board by C-grandy, from the C-grandy/MATEFloat repository on GitHub. It is a 2-layer board of 60 × 48.3 mm with 54 parts on 69 nets, routed with 317 tracks and 140 vias.
It is built around the ATMEGA328P-MU, HC-05 and BSS138. Its parts include 14 capacitors, 13 resistors, 6 connectors, 5 ICs and 5 diodes. It belongs with the AVR (ATmega, ATtiny) boards of this library.
A PCB and code for a Ranger class MATE 2024 float NOTE: This design should not be recreated, for reference only as it has errors
The PCB is based around a Atmel Atmega328p MCU interfacing with a HC-5 Bluetooth module, brushed motor driver IC, and a pressure sensor. The PCB's main purpose is to take commands over bluetooth and then dive to the bottom of a pool, find the depth, and then return to the surface and transmit the data from the pressure sensor. All electrical aspects of this system worked well, but unfortunately due to mechanical design errors the system was never tested in full capacity.
The PCB features independent 3.3V and 5V linear regulators to step down a supply from two 9V batteries in parallel. The motor driver, a TI DRV8220DRLR, is powered straight from the 9V supply. The motor driver is interfaced with the MCU using two control pins, each getting proportional control via PWM.
The system is based around a Atmel Atmega328p as it allowed for both backup software written in Arduino C++ and bare metal C for most use cases. The MCU is interfaced with a HC05 bluetooth module for communication as it was both affordable and easy to communicate to over serial UART. The float also incorporates a analog input for a pressure sensor for depth determination. A simple logic level shifter consisting of two signal MOSFETs were also included as the MCU and bluetooth module operate at different voltage levels.
The system is programmed in AVR bare metal C, incorporating a custom made UART hardware abstraction layer (HAL) for easier to understand code. The code at its current state doesn't fully incorporate sensor readings or transmitting, but simple bluetooth communication is established. NOTE: The code is not at a finished state, some features work but there is limited documentation, for reference only.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 22uf | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C9, C10, C11, C12, C13, C14, C15 |
| 5 | 10K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1, R2, R3, R4, R7 |
| 5 | 1K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R5, R8, R9, R10, R11 |
| 3 | .1uf | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C1, C2, C3 |
| 2 | 1uf | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C4, C6 |
| 2 | 330 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R12, R13 |
| 2 | 8pf | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C7, C8 |
| 2 | BLED | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D1, D2 |
| 2 | BSS138 | Package_TO_SOT_SMD:SOT-23 | Q1, Q2 |
| 2 | Conn_01x03 | Connector_JST:JST_XH_B3B-XH-A_1x03_P2.50mm_Vertical | J2, J4 |
| 2 | Conn_02x02_Counter_Clockwise | Connector_PinHeader_2.54mm:PinHeader_2x02_P2.54mm_Vertical | J1, J6 |
| 2 | SolderJumper_2_Open | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1, JP2 |
| 1 | 16MHz | Crystal:Crystal_SMD_EuroQuartz_MT-4Pin_3.2x2.5mm | Y1 |
| 1 | 2K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R6 |
| 1 | ATmega328P-M | Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.1x3.1mm | U1 |
| 1 | AVR-ISP-6 | Connector_IDC:IDC-Header_2x03_P2.54mm_Vertical | J5 |
| 1 | AZ1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U3 |
| 1 | AZ1117-5.0 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U2 |
| 1 | Conn_01x02 | Connector_JST:JST_XH_B2B-XH-A_1x02_P2.50mm_Vertical | J3 |
| 1 | DRV8220DRLR | Package_TO_SOT_SMD:SOT-563 | U4 |
| 1 | HC-05 | RF_Module:XCVR_HC-05 | U5 |
| 1 | LED_B | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D5 |
| 1 | LED_G | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D4 |
| 1 | LED_R | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D3 |
| 1 | Motor_DC | Connector_JST:JST_XH_B2B-XH-A_1x02_P2.50mm_Vertical | M1 |
| 1 | SW_Push | Button_Switch_SMD:PTS526 | SW1 |
The 50 most common of 54 parts.
It measures 60 × 48.3 mm and has 2 copper layers, 1.6 mm thick.
54 parts, built around the ATMEGA328P-MU, HC-05 and BSS138. 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 C-grandy/MATEFloat repository on GitHub, at the commit this page was made from: the board is PCB/MATE ROV Float.kicad_pcb and its schematic PCB/Driver.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask C-grandy before reusing the design.
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