The 1.8 inch board

What it is for

128 × 160 pixels is 20,480 of them: 40,960 bytes a frame, which at the library's 20 MHz clock is at least 16.4 ms on the wire. Controller in the library's table: ST7735. The panel's own sheet names none, so that is the library's word and not the vendor's.

It is a handheld size: four or five lines of text, or one small chart. At about 0.22 mm a pixel it has the coarsest pixels of the six.

Outline and holes

The board is 35.0 mm across the header edge and 56.7 mm tall, 1.6 mm thick, with four 4.8 mm holes 24.0 mm apart across and 48.0 mm apart down, 5.5 mm in from the sides. The eight header holes are 2.54 mm apart, 17.78 mm across, with pin 1 (GND) the square one at the left.

The glass module is 33.88 × 43.42 mm and sits on the back, a little over half a millimetre in from either side of the board. The panel's tail comes through a slot 8 mm wide and 6 mm tall.

The socket the panel plugs into

The ribbon goes into U7, a 12-way, 0.5 mm socket (FPC-0.5AS-12PWCR-H20). Its pin 1 is at the right-hand end with the header at the top; the silkscreen numbers it 12 to 1 from the left. What the board wires to each pin:

That table is what the board does. The vendor's sheet for the glass is a separate document with a 14-contact tail in it, and the two do not agree on how many contacts there are, so this page does not print the sheet's table and does not use it. If you are matching a bare panel to this socket, look at the panel's tail and at the socket's twelve contacts, not at either document.

The backlight

Q2, a BSS138 N-channel transistor, sits on the low side of the lamp: its gate is the BL pad with R2 (10 kΩ) from gate to GND, its drain goes through R6 (2.2 Ω) to socket pin 1, and the lamp's high side is on 3V3. BL HIGH is lit, and a BL pad nothing drives is dark, because R2 holds the gate down.

Its two jumpers

Both are open as shipped.

• CS, silkscreen CS GND, on the right, level with the socket's lower end: bridged, CS is tied to GND and the display is always selected. Do not then drive the CS pad.
• SB3, silkscreen 3V3 BL, just below it: bridged, BL is tied to 3V3, the lamp is lit whenever there is power and the BL pad is a supply. Leave it unconnected; a pin driving it LOW shorts 3V3 to GND.

Both are covered in the two solder jumpers.

Wiring and the constant

// 3V3 -> 3V3        GND -> GND
// SCL -> GPIO 12    MOSI -> GPIO 11      (classic ESP32: 18, 23)
// DC  -> GPIO 2     RST  -> GPIO 42      (classic ESP32: 2, 4)
// CS  -> GPIO 10    BL   -> GPIO 41      (classic ESP32: 15, 32)
LB_Display display(LB_TFT_18);

#include <LonelyBinaryDisplay.h>
LB_Display display(LB_TFT_18);    // the only line that changes per panel

from lb_display import LBDisplay
from lb_panels import TFT_18       # the only line that changes per panel
d = LBDisplay(TFT_18)

3.3 V only. Wiring for your board has the pins for other chips.

What is different about this one

It is the one whose name is rounded. The part is a 1.77 inch glass, 28.03 × 35.04 mm of picture, and the box and the library both call it 1.8.

And it carries two kinds of fact that the other boards keep apart: the board's own socket, which this page prints, and a sheet for the glass with a different connector in it, which it does not. When they disagree, the board is the one you are holding. Next, first light runs the self-test.