~/workshop $ cat ./inventory/1602-lcd-i2c-qapass-inland/README.md

16x2 Character LCD with I2C Backpack (QAPASS panel / "inland" backpack)

category: Display
qty: 1
status: owned / untested
maker: LCD glass: `QAPASS` (per silkscreen — a generic LCD panel maker widely rebranded, similar to the `1602IIC`-marked panel already in this library). I2C backpack: `inland` (Micro Center house brand)

Overview

A second, physically distinct 16x2 character LCD + I2C backpack unit from the 1602IIC/HLF8574T display already in this library — same functional design (HD44780-compatible glass + PCF8574-family I2C backpack), different brand pairing (QAPASS-branded LCD glass, Micro Center’s own “inland” I2C backpack board). Functionally near-identical to the other 1602 entry; kept as a separate component record since it’s a physically different unit with different brand markings and an unconfirmed I2C address.

Key specs

Display: 16 characters × 2 lines, HD44780-compatible, same class as the existing 1602IIC entry
I2C backpack: inland-branded, 4-pin (GND, VCC, SDA, SCL), onboard contrast potentiometer
Backpack IC: marking not legible in the supplied photo (likely a PCF8574-family clone, consistent with the near-universal design for this backpack style, but not confirmed for this specific unit)
Default I2C address: not confirmed — the A0/A1/A2 solder-jumper pad state wasn’t clearly visible in the supplied photo; run an I2C scanner rather than assuming 0x27 (the default for the other 1602 entry) applies here too

Pinout

Same 4-pin I2C backpack interface as the existing 1602IIC entry:

Pin	Function
GND	Ground
VCC	+5V power
SDA	I2C data
SCL	I2C clock

Wiring / typical usage

Identical wiring pattern to the other 1602 LCD in this library: four wires to the host’s I2C bus, adjust the onboard potentiometer for contrast. Since the I2C address isn’t confirmed for this unit, run an I2C scanner before assuming an address if both this display and the existing 1602IIC unit ever end up on the same bus — assuming they share the same address (0x27) without checking risks a silent conflict.

Code / libraries

Same as the other 1602 entry: Arduino LiquidCrystal_I2C library, constructed with whatever address the I2C scanner reports for this specific unit.

Source material

LCD panel brand (QAPASS) and backpack brand (inland) read directly from the supplied photo.
General 16x2 + PCF8574-family backpack design conventions cross-referenced from the existing 1602IIC entry in this library, which documents the same backpack style in more detail (that unit’s backpack chip was legible; this one’s was not).
Product photo: /inventory/1602-lcd-i2c-qapass-inland/product-photo.jpg — the actual owned unit, board brands legible.

Verification

LCD and backpack brand markings read directly from the supplied photo — high confidence on identity. I2C address and backpack IC identity are NOT confirmed — the backpack chip marking and A0/A1/A2 jumper state weren't legible in the supplied photo. Run an I2C scanner on first use rather than assuming 0x27 (the other 1602 entry's confirmed address) applies to this unit as well.

Notes / gotchas

Don’t assume this shares an I2C address with the 1602IIC/HLF8574T unit — confirm independently with a scanner, especially if both are ever wired to the same bus.
Otherwise functionally interchangeable with the other 1602 entry for basic character-display use once the address is known.