This page talks about the pins on the CYD.
There are three 4P 1.25mm JST connectors on the board, here are the broken out pins.
| Pin |
Use |
Note |
| GND |
|
|
| IO35 |
|
Input only pin, no internal pullups available |
| IO22 |
|
Also on the CN1 connector |
| IO21 |
|
Used for the TFT Backlight, so not really usuable |
This is a great candidate for I2C devices
| Pin |
Use |
Note |
| GND |
|
|
| IO22 |
|
Also on P3 connector |
| IO27 |
|
|
| 3.3V |
|
|
| Pin |
Use |
Note |
| VIN |
|
|
| IO1(?) |
TX |
Maybe possible to use as a GPIO? |
| IO3(?) |
RX |
Maybe possible to use as a GPIO? |
| GND |
|
|
The CYD has two buttons, reset and boot.
| Pin |
Use |
Note |
| IO0 |
BOOT |
Can be used as an input in sketches |
The speaker connector is a 2P 1.25mm JST connector that is connected to the amplifier, so not usuable as GPIO at the speaker connector
| Pin |
Use |
Note |
| IO26 |
Connected to amp |
i2s_set_dac_mode(I2S_DAC_CHANNEL_LEFT_EN); |
If your project requires addtional 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 |
|
| Pin |
Use |
Note |
| IO5 |
SD_CS |
|
| IO18 |
SD_SCK |
|
| IO19 |
SD_MISO |
|
| IO23 |
SD_MOSI |
|
| Pin |
Use |
Note |
| IO25 |
XPT2046_CLK |
|
| IO32 |
XPT2046_MOSI |
|
| IO33 |
XPT2046_CS |
|
| IO36 |
XPT2046_IRQ |
|
| IO39 |
XPT2046_MISO |
|
| 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 |
| 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 |