🔧 ArPI Board v2.0 – DIY Raspberry Pi Security System Adapter

Take your old wired alarm system and give it superpowers with the ArPI Board v2.0 — a community-built Raspberry Pi adapter that transforms your traditional sensors into a modern, web-accessible security system. Open-source, cloud-free, and completely under your control.

🚀 Key Features

• 15 wired zones – Compatible with NC/NO sensors like PIRs and door contacts
• Siren outputs + 4 programmable open-collector outputs
• 2 relay outputs for door strikes, strobes, etc.
• Wiegand keypad support for local arming/disarming
• SIM800/900 GSM module connector for fallback alerts
• Real-Time Clock (DS3231) onboard
• Raspberry Pi GPIO / I²C / UART interface
• Built-in UPS input for optional battery backup
• Web-based control interface via Angular + Python backend
• Offline & cloud-free – no 3rd-party account needed
• MQTT support – integrates with Home Assistant

🧰 What You’ll Need

🛠️ Hardware

• Raspberry Pi (Zero W, 2 W, 3, or 4)
• MicroSD card (≥16 GB, Class 10)
• Power supply (5V, 2A or more)
• Wired sensors (e.g., PIRs, magnetic contacts)
• 12 V siren (compatible with GO+/- or relay outputs)
• Wiegand keypad (optional)
• SIM800L / SIM900 GSM module (optional)
• Tools – screwdriver, terminal cables, basic wiring tools

💾 Software & Setup

• Raspberry Pi OS Lite (Bullseye or Bookworm)
• Terminal/SSH access for setup
• Basic Linux knowledge
• ArPI open-source software stack:
• arpi-management
• arpi-gui
• arpi-installer

🧪 What It’s Good For

• Retrofitting old alarm systems
• Learning about security electronics and Raspberry Pi GPIOs
• Creating a fully offline home alarm system
• Integrating legacy sensors into your smart home setup

⚠️ Product Limitations & Development Status

This is a DIY / hacker-friendly board, not a commercial-grade product.

• You must wire and configure it manually
• Some features still evolving (e.g., keypad layout, GUI design)
• No official support or warranty — community-supported only
• Hardware quirks: Wi-Fi range may be limited in enclosures; terminal spacing may be tight

> ⚡ The ArPI Board has been running in real homes for over a year, but it's best suited for tinkerers, not critical environments.

✅ Ideal For

• Home automation enthusiasts
• DIYers with Raspberry Pi experience
• Privacy-conscious users avoiding cloud-based systems

❌ Not Ideal For

• Users looking for plug-and-play convenience
• Enterprise or mission-critical installations
• Beginners without electronics or Linux knowledge

📚 Learn More

• 🌐 arpi-security.info
• 📖 Documentation
• 🧠 GitHub Repos
• 🛠️ Build Walkthroughs

Bottom line: The ArPI Board v2.0 gives you full control over your home security setup. If you're up for some wiring and Linux, it’s a rewarding open-source platform — just don’t expect commercial polish.