Other Modules
Other modules — keypads, RFID reader, SD and micro SD card modules, joystick, W5500 Ethernet, optocoupler isolation, SPI flash memory and a 16-channel multiplexer. Modules that add input, storage and networking to a project.
Other Modules — buying guide
What is in this category
17 products: KY-004 Switch Module (Push Button), W25Q32 External Memory Module (Flash Memory), SD Card Module (Reader and Writer), PC817 2 Channel Optocoupler Isolation Module, 4×5 Keypad Module (Membrane), KY-023 PS2 Joystick Module (XY), 5 pieces/set Large Button Module, 4×4 Keypad Module (16 keys) and more.
How to choose
- Keypad 4x4 / 4x5 / 1x4 — code locks, calculators, menus; the membrane version is thin and self-adhesive.
- MFRC522 RFID — 13.56 MHz, card and fob included; access control, attendance.
- SD / micro SD module — SPI, FAT32; sensor logs, audio files, stored web pages.
- W5500 Ethernet — wired internet, more stable than WiFi; module and Uno shield versions.
- PC817 optocoupler — galvanically isolates 220V or industrial signals from the Arduino.
- CD74HC4067 — 16 sensors on one analog pin.
Compatibility
SPI modules (SD, RFID, W5500) share pins 11/12/13 on the Uno; all work at 3.3V with ESP32.
Ordering and delivery
All products are in stock in Baku — price and availability are shown live on each product page. Order on the website or in the mobile app; our operator will contact you to confirm payment and delivery within Baku. Wiring diagrams and code examples are in the edu.embedded.az lessons.
