Arduino Uno Multiple Modules

Question

I have an Arduino Uno and I want to connect;

• RFID Reader (RC522)
• WiFi Module (ESP8266 ESP-01)
• SD Card Module
• RTC (Real Time Clock - DS1307)

Same time but pinouts are not enough. Is there a way to doing this with Uno or I have to buy an Arduino Mega ? I saw "Expansion Sensor Shield"s but I do not know what is the logic of using this ?

Regards

Answer 1

Let's see which device uses which communication protocol:

1. WiFi Module (ESP8266 ESP-01) uses Serial communication.
2. RTC (Real Time Clock - DS1307) uses I²C communication.
3. RFID Reader (RC522) uses SPI communication.
4. SD Card Module also uses SPI communication.

Now, the Arduino UNO supports One I²C, One SPI and One Serial (by default) communication port.

So, you can easily connect your Wifi and RTC modules.

Now, actual problem is: "How to access multiple SPI interfaces on Arduino" (and that is a solved problem).

Hope it helps and you don't have to buy an Arduino MEGA.