// display
HD44780 16x2 LCD (I²C)
Classic 2-line character LCD with PCF8574 backpack
€3.00
avg eur
no image
I2C
Pins
4
Specs
4
Libraries
2
Protocols
1
// wiring → esp32 devkit v1
3V3
EN
GPIO36
VP
GPIO39
VN
GPIO34
GPIO35
GPIO32
GPIO33
GPIO25
GPIO26
GPIO27
GPIO14
GPIO12
GND
GND
GPIO13
ESP32
WROOM-32
devkit v1
USB
VIN
5V
VCC
GND
GPIO23
GPIO22
SCL
SCL
GPIO1
TX0
GPIO3
RX0
GPIO21
SDA
SDA
GPIO19
MISO
GPIO18
SCK
GPIO5
SS
GPIO17
TX2
GPIO16
RX2
GPIO4
GPIO2
GPIO15
sensor pin (left)
sensor pin (right)
unused
// pinout → esp32
| Sensor Pin | ESP32 Connection |
|---|---|
| VCC | 5V (VIN) |
| GND | GND |
| SCL | GPIO 22 |
| SDA | GPIO 21 |
// technical specs
Characters
16x2 (also 20x4)
Backlight
blue/green w/ pot
I2C addr
0x27 / 0x3F
Voltage
5V
// github libraries
// notes & warnings
The PCF8574 backpack converts the 6-wire HD44780 interface to I²C. Display itself is 5V — ESP32's 3.3V SDA/SCL still works because PCF8574 is 5V tolerant.
// related sensors · display