Skip to content

Latest commit

 

History

History
137 lines (103 loc) · 2.82 KB

PINS.md

File metadata and controls

137 lines (103 loc) · 2.82 KB
Raw

Pins

This page talks about the pins on the CYD.

Connector types

Connector Type Note
P1 4P 1.25mm JST Serial
P3 4P 1.25mm JST GPIO
P4 2P 1.25mm JST Speaker
CN1 4P 1.25mm JST GPIO (I2C)

What pins are available on the CYD?

There are 3 easily accessible GPIO pins

Pin Location Note
IO35 P3 JST connector Input only pin, no internal pull-ups available
IO22 P3 and CN1 JST connector
IO27 CN1 JST connector

If you need more than that, you need to start taking them from something else. An SD Card sniffer like mentioned in the Add-ons is probably the next easiest.

After that you're probably de-soldering something!

Broken Out Pins

There are three 4P 1.25mm JST connectors on the board

P3

Pin Use Note
GND
IO35 Input only pin, no internal pull-ups available
IO22 Also on the CN1 connector
IO21 Used for the TFT Backlight, so not really usable

CN1

This is a great candidate for I2C devices

Pin Use Note
GND
IO22 Also on P3 connector
IO27
3.3V

P1

Pin Use Note
VIN
IO1(?) TX Maybe possible to use as a GPIO?
IO3(?) RX Maybe possible to use as a GPIO?
GND

Buttons

The CYD has two buttons, reset and boot.

Pin Use Note
IO0 BOOT Can be used as an input in sketches

Speaker

The speaker connector is a 2P 1.25mm JST connector that is connected to the amplifier, so not usable as GPIO at the speaker connector

Pin Use Note
IO26 Connected to amp i2s_set_dac_mode(I2S_DAC_CHANNEL_LEFT_EN);

RGB LED

If your project requires additional pins to what is available elsewhere, this might be a good candidate to sacrifice.

Note: LEDs are "active low", meaning HIGH == off, LOW == on

Pin Use Note
IO4 Red LED
IO16 Green LED
IO17 Blue LED

SD Card

Uses the VSPI Pin names are predefined in SPI.h

Pin Use Note
IO5 SS
IO18 SCK
IO19 MISO
IO23 MOSI

Touch Screen

Pin Use Note
IO25 XPT2046_CLK
IO32 XPT2046_MOSI
IO33 XPT2046_CS
IO36 XPT2046_IRQ
IO39 XPT2046_MISO

LDR (Light Sensor)

Pin Use Note
IO34

Display

Uses the HSPI

Pin Use Note
IO2 TFT_RS AKA: TFT_DC
IO12 TFT_SDO AKA: TFT_MISO
IO13 TFT_SDI AKA: TFT_MOSI
IO14 TFT_SCK
IO15 TFT_CS
IO21 TFT_BL Also on P3 connector, for some reason

Test points

Pad Use Note
S1 GND near USB-SERIAL
S2 3.3v for ESP32
S3 5v near USB-SERIAL
S4 GND for ESP32
S5 3.3v for TFT
JP0 (pad nearest USB socket) 5v TFT LDO
JP0 3.3v TFT LDO
JP3 (pad nearest USB socket) 5v ESP32 LDO
JP3 3.3v ESP32 LDO