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Glyph ESP32-C3 Pinouts

PCBCUPID_GLYPHC3-Pinout-whiteBG_result

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The Glyph-C3 has many pins, ports, and features. This page takes you on a tour on each of the pin on the board!

Power Pins and Connections​

  • GND: This is the common ground for all power and logic.
  • BAT: This is the positive voltage to/from the Battery(+) Positive terminal (This pin is usual at voltage between 2.7v-4.2v)
  • USB: This is the positive voltage to/from the USB C jack, if USB is connected (This is usual at voltage 5v)
  • EN: This is the enable pin of esp32, you can pull down this using a external button or other controller to reset the board.
  • 3.3V: These pins are the output from the 3.3V regulator, they can supply 600mA peak current.
PCBCUPID_c3_power_pins_result
  • Lipo Battery PADS: 2 Pads behind the board to solder Lipo or li-ion batteries to power the Glyph board.
  • MSR PADS: Short this MSR pad to measure battery capacity using IO0 (Marked as A0 on board).
PCBCUPID_c3_rear_bat_pins_result

Communication Pins​

I2C, SPI, and UART on ESP32-C3​

The ESP32-C3 is capable of handling I2C, SPI, and UART on many pins. However, to simplify things we have assigned few of the IO pins to make things simpler for users.

I2C Pins​

  • I2C SCL: SCL, IO5
  • I2C SDA: SDA, IO4
PCBCUPID_c3_i2c_result

SPI Pins​

  • SPI SCK : SCK, IO10
  • SPI MOSI: MO , IO6
  • SPI MISO: MI , IO7
  • SPI CS : ANY IO That's available
PCBCUPID_c3_spi_pins_result

UART Pins​

  • UART TX: TX, IO21
  • UART RX: RX, IO22
PCBCUPID_c3_uart_pins_result

Addtional Ports / Pins​

This is a QWIIC / STEMMA compatible connector which makes it easy for users to connect to 100's of sensors and modules made by Adafruit & Sparkfun.

PCBCUPID_c3_glink_result

USB PINS​

This is used for power and data transfer. Connect to your computer via a USB C cable to update firmware and at the USB pin you would receive 5v

PCBCUPID_c3_all_ub_pins_result

PWM PINS​

The ESP32-C3 supports PWM on all pins. However, it is not capable of PWM on all pins at the same time. There are multiple PWM channels, each with configurable frequency and duty cycle. The important thing to know is that you cannot use the same channel on different pins at the same time. Please refer to ESP32C3 DATASHEET

Analog Pins​

The ESP32-C3 has four ADC channels. These pins are the only pins capable of handling analog (12-bit), and they can also do digital.

  • A0/IO0: ADC1 channel 0
  • A1/IO1: ADC1 channel 1
  • A2/IO2: ADC1 channel 2
  • A3/IO3: ADC1 channel 3
  • SDA/IO4: ADC1 channel 4
  • SCL/IO5: ADC2 channel 0
PCBCUPID_c3_analog_pinouts_result

Digital Pins​

These are the digital I/O pins. They all have multiple capabilities but can be used only one at a time.

  • D0/GPIO0: Digital I/O pin 0( GPIO0, ADC1_CH0, XTAL_32K_P).
  • D1/GPIO1: Digital I/O pin 1(GPIO1, ADC1_CH1, XTAL_32K_N).
  • D2/GPIO2: Digital I/O pin 2(GPIO2, ADC1_CH2, FSPIQ).
  • D3/GPIO3: Digital I/O pin 3(GPIO3, ADC1_CH3).
  • SDA/GPIO4: The main I2C1 data pin(GPIO4, ADC1_CH4, FSPIHD, MTMS).
  • SCL/GPIO5: The main I2C1 clock pin(GPIO5, ADC2_CH0, FSPIWP, MTDI).
  • D8/GPIO8: Digital I/O pin 8(GPIO8).
  • D9/GPIO9: Digital I/O pin 9(GPIO9).
  • A0/GPIO0: Analog I/O pin 0(GPIO0, ADC1_CH0, XTAL_32K_P).
  • A1/GPIO1: Analog I/O pin 1(GPIO1, ADC1_CH1, XTAL_32K_N).
  • A2/GPIO2: Analog I/O pin 2(GPIO2, ADC1_CH2, FSPIQ).
  • A3/GPIO3: Analog I/O pin 3(GPIO3, ADC1_CH3).
  • D-/GPIO18: Digital I/O pin 18(GPIO18, USB_D).
  • D+/GPIO19: Digital I/O pin 19(GPIO19, USB_D+).
  • SCK/GPIO10: The main SPI0 SCK(GPIO10, FSPICS0).
  • MO/GPIO6: The main SPI0 MOSI(GPIO6, FSPICLK, MTCK).
  • MI/GPIO7: The main SPI0 MISO(GPIO7, FSPID, MTDO).
  • RX/GPIO20: The main UART0 RX pin(GPIO20, U0RXD).
  • TX/GPIO21: The main UART0 TX pin(GPIO21, U0TXD).
PCBCUPID_c3_digital_pinout_pins_result

Schematic Diagram For Glyph-C3​

PCBCUPID_C3_schematic

For better view you can download the schematic diagram from here