🏔️ Altimeter -- Firmware & Custom PCB Design

A portable altitude measurement device with Bluetooth Low Energy and USB Serial connectivity, featuring a custom-designed PCB with STM32/NRF52840 microcontroller, Winbond flash memory, and multiple firmware variants for different communication modes.

See also: Desktop App (Bluetooth) | Desktop App (USB Serial)

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📷 Custom PCB Design

Board -- 3D Render (Altium Designer)

Compact PCB featuring microcontroller, Winbond flash memory, LiPo battery connector, MODE/RESET buttons, and SWD debug header (3V3, GND, RST, DIO, CLK).

Board -- Component Layout

SWD Breakout Board -- Programming & Debug Interface

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🔧 Features

• Barometric Altitude Measurement -- Pressure-based altitude calculation with high accuracy
• Dual Connectivity -- Bluetooth Low Energy (BLE) and USB Serial communication modes
• Multi-Platform Firmware -- Separate firmware builds for ESP32, NRF52840, and USB Serial
• Custom PCB -- Designed in Altium Designer with production-ready Gerber outputs
• Winbond Flash Memory -- On-board data logging capability
• SWD Debug Header -- 3V3, GND, RST, DIO, CLK pins for programming and debugging
• MODE/RESET Buttons -- Physical controls for operation mode switching
• LiPo Battery Powered -- Portable operation with JST battery connector
• Companion Desktop Apps -- Real-time altitude visualization via BLE or USB

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📁 Project Structure

Altimeter-Firmware-and-Design/
|-- Altimeter_Bluetooth_Firmware/    # BLE-based firmware (ESP32)
|-- Altimeter_Firmware_Serial_USB/   # USB Serial firmware variant
|-- Altimeter_NRF52840/              # NRF52840-specific BLE firmware
|-- Board Design/                    # Altium Designer PCB project
|   |-- Schematics
|   |-- PCB Layout
|   +-- Gerber outputs
|-- Documents/                       # 3D renders, pinout diagrams
|   |-- 1.png                        # Board 3D render (front)
|   |-- 2.png                        # Board component layout
|   +-- Breakout_Board_Pinout.png    # SWD debug breakout
+-- Final Delivery Altimeter/        # Production-ready package

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🛠️ Tech Stack

Component	Technology
MCUs	ESP32, NRF52840
Language	C/C++
Communication	BLE (Bluetooth Low Energy), USB Serial
Sensor	Barometric pressure sensor (altitude)
Flash	Winbond SPI flash memory
PCB Design	Altium Designer
Desktop Apps	BLE App, USB App
Power	LiPo battery
Debug	SWD interface (J-Link / ST-Link compatible)

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👤 Author

Muhammad Zaeem Sarfraz -- Electronics & IoT Hardware Engineer

• 🔗 LinkedIn
• 📧 Zaeem.7744@gmail.com
• 🌍 Vaasa, Finland