Basic ESP8266 RFID reader that prints results on a Nokia 5110 display
| RFID-RF522 | ESP8266 | Description |
|---|---|---|
| SDA (SS) | D4 | (Slave Select) - the pin on each device that the master can use to enable and disable specific devices. |
| SCK | D5 | (Serial Clock) - The clock pulses which synchronize data transmission generated by the master |
| MOSI | D7 | (Master Out Slave In) - The Master line for sending data to the peripherals |
| MISO | D6 | (Master In Slave Out) - The Slave line for sending data to the master |
| IRQ | - | |
| GND | G | |
| RST | D3 | |
| 3.3V (VCC) | 3V3 |
| LCD 5110 | ESP8266 | Description |
|---|---|---|
| RST | D0 | This pin resets the module. It an active low pin (resets when 0V is provided) |
| CE (CS/SS) | D8 | This pin is made low (0V) to select this particular display when more than one SPI peripherals are used |
| DC | D2 | This pin is used to switch between Data mode (high) and Command mode (low) |
| DIN (MOSI) | D7 | This is the input pin (MOSI) through which serial instructions are sent |
| CLK | D5 | All SPI modules require a common clock, this clock source is supplied to this pin |
| VCC | 3V3 | This pin is used to power the display the supply voltage is from 2.7V to 3.3V |
| BL | 3V3 or - | This pin powers the backlight of the display (3.3V maximum) |
| GND | G | Connects to the ground of the circuit |