LCD 20×4 Character Display (HD44780)
by Generic
SKU: PSA-CMP-LCD20X4
No reviews yetTypical India street price
₹180–₹350
Bigger cousin of 16×2 — dashboards with four lines.
Interface: Parallel 4-bit / I2C backpack
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Concept
Same HD44780 protocol, 20 columns × 4 rows.
A little theory
Line addresses are not linear (0x00, 0x40, 0x14, 0x54). In the classroom, treat LCD 20×4 Character Display (HD44780) as a beginner part using Parallel 4-bit / I2C backpack. Typical India street price is about ₹180–₹350. Always verify voltage and pin labels on your exact module — silk screens vary across clones. Start with a datasheet or trusted learn guide, power the part correctly, share GND with the MCU, and test with a simple blink/read sketch before building the full project. Measure voltages with a multimeter when something fails, and keep actuator current off the MCU regulator.
How it works in a project
LiquidCrystal_I2C (0x27 or 0x3F) lcd.setCursor(col,row).
Classroom & project use
- Weather dashboard
- Quiz scoreboard
- Displays classroom demo
Buying in India
Precautions
- Check 3.3 V MCU compatibility before connecting signal pins
- Share a common GND with the microcontroller
Specifications
| Size | 20x4 |
| IC | HD44780 |
| Category | Displays |
| Difficulty | Beginner |
| Voltage | 5V |
| Interface | Parallel 4-bit / I2C backpack |
Pinout
VCC | GND | SCL | SDA (confirm address with I2C scanner)
