MiWi Protocol
MiWi is a low-power wireless communication protocol developed by Microchip Technology. It is based on IEEE 802.15.4 and used for short-range, low data-rate wireless networks.
Key Features
- Based on IEEE 802.15.4 standard
- Low power consumption
- Short range (10–100 meters)
- Simple and low-cost implementation
- Supports small IoT networks
- Frequency bands: 2.4 GHz, 915 MHz, 868 MHz
Network Topologies
1. Star Topology
- One central PAN coordinator
- All devices communicate through it
- Simple and fast communication
2. Mesh Topology
- Devices can forward data
- Increases network range
- More flexible than star
Working Steps of MiWi
1. Network Creation
- PAN coordinator creates network
- Assigns PAN ID
2. Device Joining
- Device scans available networks
- Sends join request
- Coordinator assigns address
3. Channel Selection
- Selects free channel automatically
- Works in 2.4 GHz or sub-GHz bands
4. Data Transmission
- Uses CSMA/CA for channel access
- Checks channel before sending data
- Uses random backoff if busy
5. Acknowledgement
- Receiver sends ACK if data received
- Retransmission if ACK not received
6. Power Saving
- Devices enter sleep mode when idle
- Wakes up for communication
7. Mesh Routing (Optional)
- Data can pass through multiple nodes
- Extends communication range
Comparison Table
| Feature | MiWi | Zigbee |
|---|---|---|
| Complexity | Low | High |
| Network Size | Small | Large |
| Setup | Easy | Complex |
| Power Usage | Very Low | Low |
Applications
- Home automation
- Industrial monitoring
- Wireless sensor networks
- Remote control systems
- IoT devices