The main processor chip is the Espressif ESP32-S3 with 3.3v logic/power. It has 16MB of Flash and 8MB of RAM.
The ESP32-S3 comes with WiFi and Bluetooth LE baked right in, though CircuitPython only supports WiFi at this time, not BLE on the S3 chip
There is a 40-pin display connector to connect your display. Displays should be connected with the metal pins of the cable facing towards the board. Pin 1 should be furthest from the JST connector.
The Qualia S3 includes a PCA9554 IO Expander. The IO Expander is connected via the I2C bus. The main purpose of the expander is to add additional pins to communicate with the display.
The default address of the IO expander is 0x3F, but it can be changed by soldering jumpers on the reverse side in case it interferes with another I2C device.
There is a 4-pin Stemma QT connector on the left. The I2C has pullups to 3.3V power.
In CircuitPython, you can use the STEMMA connector with board.SCL and board.SDA, or board.STEMMA_I2C().
Reset is the Reset pin. Tie to ground to manually reset the ESP32-S3.
Tying Boot0 to ground while resetting will place the ESP32-S3 in ROM bootloader mode.
If you'd like to do lower level debugging, we have the ESP32-S3's TXD0 debug pin exposed as TX0 to view messages.
To read, you would connect a Serial UART cable Receive connection here and the cable ground connection to the GND pin.
The SPI pins of the ESP32-S3 are exposed for communication with other SPI hardware.
Each of these pins can alternatively be used for digital I/O:
- SCK is connected to
board.SCKor Arduino5. - MISO is connected to
board.MISOor Arduino6. - MOSI is connected to
board.MOSIor Arduino7. - CS is connected to
board.CSor Arduino15and includes a 10K Pull-up resistor.
On the bottom side towards the right, there is a connector labeled A0. This is a 3-pin JST analog connector for sensors, NeoPixels, or analog output or input.
For the JST connected, there is a jumper above that can be cut and soldered to use 3V instead of 5V.
Along the bottom there are also pins labeled A0 and A1.
Each of these pins can be used for analog inputs or digital I/O.
There are three buttons along the left side of the Qualia S3.
The Reset button is located in the top position. Click it once to re-start your firmware. Click it again after about a half second to enter bootloader mode.
The UP button is located in the middle and is connected to the IO expander
The DN button, or Down button, is located on the bottom and is connected to the IO expander.
The expander implements a light pullup for each of the buttons and pressing either of them pulls the input low.
The Boot0 button is located between the up button and the Microcontroller. Hold it while pressing reset to enter ROM Bootloader mode.
Soldering the bottom PWM jumper allows using Pin A1 to control the backlight of the display.
By default, 25mA is provided to the backlight, but additional amperage can be set by soldering the top jumpers to provide up to 200mA if needed.
On the reverse, are a couple of solderable jumpers to change the I2C address of the IO Expander. By default, both jumpers are set to high, providing a default address of 0x3F. However, it can be set between 0x3B-0x3F.
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