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Educational board for simple experiments witn Arduino
The board includes a text LCD 16 * 2, two buttons, a squeaker, a thermistor and a photoresistor.
January, 2025. I2C FLASH memory Atmel AT24C512 (64 KB) was added
The display is connected using a 4-bit scheme, as in the examples of the Arduino IDE.
(Examples of the LiquidCrystal library).
Text LCD 16*2 pins
| Pin | Designation | Description |
| 1 | GND | Ground |
| 2 | Vcc | Power Supply (3,3—5 V) |
| 3 | Vo | Contrast |
| 4 | RS | Register Select |
| 5 | R/W | Read/Write mode |
| 6 | E | Enable (data strobe) |
| 7 | DB0 | Data Bus (8-bit mode)(the least significant bit in 8-bit mode) |
| 8 | DB1 | Data Bus (8-bit mode) |
| 9 | DB2 | Data Bus (8-bit mode) |
| 10 | DB3 | Data Bus (8-bit mode) |
| 11 | DB4 | Data Bus (8 and 4-bit mode)(the least significant bit in 4-bit mode) |
| 12 | DB5 | Data Bus (8 and 4-bit mode) |
| 13 | DB6 | Data Bus (8 and 4-bit mode) |
| 14 | DB7 | Data Bus (8 and 4-bit mode) |
| 15 | +LED | + LED |
| 16 | –LED | – LED |
LCD connection to Arduino UNO
| LCD pin | Designation | Arduino Uno pin |
| 1 | GND | GND |
| 2 | Vcc | 5V |
| 3 | Vo | GND |
| 4 | RS | 12 |
| 5 | R/W | GND |
| 6 | E | 11 |
| 7 | DB0 | — |
| 8 | DB1 | — |
| 9 | DB2 | — |
| 10 | DB3 | — |
| 11 | DB4 | 5 |
| 12 | DB5 | 4 |
| 13 | DB6 | 3 |
| 14 | DB7 | 2 |
| 15 | Vcc | 5V |
| 16 | GND | GND |
LCD wiring diagram
Additional buttons and sensors
| Designation | Arduino Uno pin |
| Button 1 | 6 |
| Button 2 | 7 |
| Piezo-buzzer | 8 |
| Thermistor | A0 (and pull-up 10 kOhm resistor to +5V) |
| Photoresistor | A1 (and pull-up 10 kOhm resistor to +5V) |
Wiring diagram for buttons and sensors
Additional I2C FLASH memory Atmel AT24C512 (64 KB)
| Pin | Designation | Arduino Uno pin |
| 4 | GND | GND |
| 5 | SDA | A4 * |
| 6 | SCL | A5 * |
| 8 | Vcc | 5V |
* - if the device does not work, install 2 pull-up resistors to +5V with a rating of 4.7 kOhm to 10 kOhm
Atmel AT24C512 (64 KB) pins
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