Get the communications hardware you need - today
When a build, lab class or installation is delayed by missing modules, time and budget evaporate. Communica keeps a broad range of communications stock locally so you can finish projects on schedule. We stock wireless modules (Wi-Fi, Bluetooth, LoRa), cellular modems, Ethernet PHYs, gateways, antennas and test accessories from maker-friendly brands.
Why local stock matters for South Africa
Local availability reduces lead time, simplifies procurement for campus projects and provides VAT invoices for institutional purchasing. You can collect from our Samrand head office, visit our Pretoria or Cape Town branches, or request account quotes for larger orders. Check branch hours and collection options to plan installs without delay: Branches & Trading Hours.
Common communications categories we stock
- Development boards & single-board computers with onboard networking
- Wi-Fi and Bluetooth modules and breakout boards
- LoRa modules and gateways for long-range sensor networks
- Cellular (3G/4G) modems and antennas for telemetry
- Ethernet modules, PoE injectors and network connectors
Quick spec comparison
| Type | Range | Typical Use |
|---|---|---|
| BLE Module | 10-30 m | Low-power sensor links, wearables |
| Wi-Fi Module | 30-100 m | High-bandwidth telemetry, local LAN access |
| LoRa Module | 1-15 km | Rural telemetry, battery sensors |
| Cellular Modem | Nationwide (carrier dependent) | Remote telemetry, mobile gateways |
Compatibility callouts and practical guidance
Match module IO levels (3.3V vs 5V), UART/USB interfaces and antenna connectors when integrating. For example, many ESP32 Wi-Fi modules use 3.3V logic and require level shifting when interfacing with 5V AVR boards. If you need help comparing parts, use our product index to explore options: All Products.
Accessory bundles and typical bundles
We recommend ordering modules with essential accessories: antennas with SMA/PCB options, regulated power supplies, breakout headers and USB-to-serial adapters. Typical starter bundle for a LoRa node includes a LoRa module, helical antenna, 3.3V regulator and a waterproof enclosure - available via our Collections browse: Collections.
Hands-on wiring example (UART sensor gateway)
Below is a minimal ASCII wiring diagram for a cellular modem connected to a microcontroller over UART with hardware flow control:
MCU Cellular ModemTX --------------> RXRX <-------------- TXRTS --------------> CTSCTS <-------------- RTSGND --------------> GNDVCC (3.8-5V) -----> VCC (check modem voltage)
Always verify the modem's recommended supply range and include decoupling capacitors to handle transmit current spikes. If you need brand guidance, see our shop-by-brand listings for maker-favourite suppliers: Shop by Brand.
