Inkplate 6COLOR – Free GPIO pins
Inkplate 6COLOR's onboard ESP32-WROVER has some pins reserved for internal use (for example, the connection to the e-paper display) and cannot be used for end-user applications. This page contains a list of the available GPIO pins that can be used for external applications.
If you don't need pin details and are just interested in the pins, here are the Inkplate 6COLOR pins that are not connected to any external component:
ESP32: IO2, IO4, IO5, IO25, IO26, GPIO EXPANDER: P0-0 to P0-7, P1-0, P1-3 to P1-7
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Because the e-paper panel is driven over SPI rather than a parallel bus, almost all of the IO expander is free on Inkplate 6COLOR. Only two pins are taken: P1-1 enables the battery voltage divider and P1-2 switches microSD card power. Both are on jumpers, so you can reclaim them if you need to.
Inkplate 6COLOR free pins
See the table below for pin functions and what each pin is connected to:
Free pin table
| PIN | CONNECTED TO | FUNCTION |
|---|---|---|
| TXD | CH340 | UART transmit pin |
| RXD | CH340 | UART receive pin |
| IO12 | microSD (MISO) | ADC2_CH5, TOUCH5, RTC_GPIO15, MTDI, HSPIQ, HS2_DATA2, SD_DATA2, EMAC_TXD3 |
| IO13 | microSD (MOSI) | ADC2_CH4, TOUCH4, RTC_GPIO14, MTCK, HSPID, HS2_DATA3, SD_DATA3, EMAC_RX_ER |
| IO14 | microSD (SCK) | ADC2_CH6, TOUCH6, RTC_GPIO16, MTMS, HSPICLK, HS2_CLK, SD_CLK, EMAC_TXD2 |
| IO15 | JP6 Check jumper details | ADC2_CH3, TOUCH3, MTDO, HSPICS0, RTC_GPIO13, HS2_CMD, SD_CMD, EMAC_RXD3 |
| IO34 | JP1 Check jumper details | ADC1_CH6, RTC_GPIO4 |
| IO35 | V_BAT | ADC1_CH7, RTC_GPIO5 |
| IO36 | WAKEUP BUTTON | ADC1_CH0, RTC_GPIO0 |
| IO39 | JP5 Check jumper details | ADC1_CH3, RTC_GPIO3 |
| IO2 | FREE | ADC2_CH2, TOUCH2, RTC_GPIO12, HSPIWP, HS2_DATA0, SD_DATA0 |
| IO4 | FREE | ADC2_CH0, TOUCH0, RTC_GPIO10, HSPIHD, HS2_DATA1, SD_DATA1, EMAC_TX_ER |
| IO5 | FREE | VSPICS0, HS1_DATA6, EMAC_RX_CLK |
| IO25 | FREE | DAC_1, ADC2_CH8, RTC_GPIO6, EMAC_RXD0 |
| IO26 | FREE | DAC_2, ADC2_CH9, RTC_GPIO7, EMAC_RXD1 |
| P0-0 to P0-7, P1-0, P1-3 to P1-7 | FREE | I/O on the PCAL6416A expander, broken out to pads |
| P1-1 | JP3 Check jumper details | Enables the battery voltage divider |
| P1-2 | JP2 Check jumper details | Switches microSD card power |