IoT display board combining an ATSAMD51J20 and ESP32 Wi-Fi coprocessor with a color TFT touchscreen, running CircuitPython. Fetches data from web APIs over TLS/SSL Wi-Fi; onboard touchscreen enables interactive UI without a separate computer.
Main processor, ATSAMD51J20 Cortex M4, 120MHz with 3.3V logic/power per Adafruit Learn pinouts page.
ESP32 WiFi co-processor SPI chip-select, documented as board.ESP_CS / Arduino 8.
ESP32 WiFi co-processor ready/busy pin, documented as board.ESP_BUSY / Arduino 5.
ESP32 WiFi co-processor reset pin, documented as board.ESP_RESET / Arduino 7.
UART connection to ESP32 WiFi co-processor, documented as board.ESP_RX.
UART connection to ESP32 WiFi co-processor, documented as board.ESP_TX.
microSD card SPI chip-select, documented as board.SD_CS / Arduino 32.
microSD card detect pin, documented as board.SD_CARD_DETECT / Arduino 33.
DAC0 analogue output feeding the onboard speaker amplifier, documented as board.AUDIO_OUT / Arduino A0.
Speaker amplifier shutdown/enable pin, documented as board.SPEAKER_ENABLE / Arduino 50.
4-pin JST I2C connector for external I2C sensors; Adafruit notes the 5V3 jumper must be set to 3V for SAMD51-safe pullups.
Ambient light sensor analogue input, documented as board.LIGHT / Arduino A2.
Resistive touchscreen YD connection, documented as board.TOUCH_YD / Arduino A4.
Resistive touchscreen XL connection, documented as board.TOUCH_XL / Arduino A5.
Resistive touchscreen YU connection, documented as board.TOUCH_YU / Arduino A6.
Resistive touchscreen XR connection, documented as board.TOUCH_XR / Arduino A7.
TFT reset control, documented as board.TFT_RESET / Arduino 24.
TFT write control, also TFT data/command pin in SPI mode, documented as board.TFT_WR or board.TFT_DC / Arduino 25.
TFT read control, documented as board.TFT_RD / Arduino 9.
TFT register-select control, documented as board.TFT_RS / Arduino 10.
TFT chip-select control, documented as board.TFT_CS / Arduino 11.
TFT tearing-effect signal, documented as board.TFT_TE / Arduino 12.
PWM-controllable TFT backlight transistor connection, documented as board.TFT_BACKLIGHT / Arduino 25.
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| ATSAMD51J20 | mcu | Main processor, ATSAMD51J20 Cortex M4, 120MHz with 3.3V logic/power per Adafruit Learn pinouts page. | 3.3V logic/power | |
| ESP_CS | digital | ESP32 WiFi co-processor SPI chip-select, documented as board.ESP_CS / Arduino 8. | 3.3V logic | |
| ESP_BUSY | digital | ESP32 WiFi co-processor ready/busy pin, documented as board.ESP_BUSY / Arduino 5. | 3.3V logic | |
| ESP_RESET | digital | ESP32 WiFi co-processor reset pin, documented as board.ESP_RESET / Arduino 7. | 3.3V logic | |
| ESP_RX | uart | UART connection to ESP32 WiFi co-processor, documented as board.ESP_RX. | 3.3V logic | |
| ESP_TX | uart | UART connection to ESP32 WiFi co-processor, documented as board.ESP_TX. | 3.3V logic | |
| SD_CS | spi | microSD card SPI chip-select, documented as board.SD_CS / Arduino 32. | 3.3V logic | |
| SD_CARD_DETECT | digital | microSD card detect pin, documented as board.SD_CARD_DETECT / Arduino 33. | 3.3V logic | |
| AUDIO_OUT | analog | DAC0 analogue output feeding the onboard speaker amplifier, documented as board.AUDIO_OUT / Arduino A0. | analogue output from SAMD51 DAC0 | |
| SPEAKER_ENABLE | digital | Speaker amplifier shutdown/enable pin, documented as board.SPEAKER_ENABLE / Arduino 50. | 3.3V logic | |
| STEMMA I2C | i2c | 4-pin JST I2C connector for external I2C sensors; Adafruit notes the 5V3 jumper must be set to 3V for SAMD51-safe pullups. | 3.3V I2C when 5V3 jumper is changed to 3V | |
| LIGHT | analog | Ambient light sensor analogue input, documented as board.LIGHT / Arduino A2. | analogue input | |
| TOUCH_YD | analog | Resistive touchscreen YD connection, documented as board.TOUCH_YD / Arduino A4. | analogue touch input | |
| TOUCH_XL | analog | Resistive touchscreen XL connection, documented as board.TOUCH_XL / Arduino A5. | analogue touch input | |
| TOUCH_YU | analog | Resistive touchscreen YU connection, documented as board.TOUCH_YU / Arduino A6. | analogue touch input | |
| TOUCH_XR | analog | Resistive touchscreen XR connection, documented as board.TOUCH_XR / Arduino A7. | analogue touch input | |
| TFT_RESET | display | TFT reset control, documented as board.TFT_RESET / Arduino 24. | 3.3V logic | |
| TFT_WR / TFT_DC | display | TFT write control, also TFT data/command pin in SPI mode, documented as board.TFT_WR or board.TFT_DC / Arduino 25. | 3.3V logic | |
| TFT_RD | display | TFT read control, documented as board.TFT_RD / Arduino 9. | 3.3V logic | |
| TFT_RS | display | TFT register-select control, documented as board.TFT_RS / Arduino 10. | 3.3V logic | |
| TFT_CS | display | TFT chip-select control, documented as board.TFT_CS / Arduino 11. | 3.3V logic | |
| TFT_TE | display | TFT tearing-effect signal, documented as board.TFT_TE / Arduino 12. | 3.3V logic | |
| TFT_BACKLIGHT | display | PWM-controllable TFT backlight transistor connection, documented as board.TFT_BACKLIGHT / Arduino 25. | backlight control signal |
SPI · I2C · 3.3 V · 3.3 – 5 V · Breakout
Adafruit describes product 398 as a 16x2 RGB backlight LCD using digital pins for LCD control and PWM pins for the backlight; the product…
Module pins: ESP_RX, ESP_TX, SD_CS, AUDIO_OUT, STEMMA I2C, LIGHT, TOUCH_YD, TOUCH_XL. Schematik maps them to your board in the app.
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