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Heltec E-ink Modules

Wiring: ESP32

✅ ESP32 uses 3.3V logic. It can connect directly to the display.

Display ESP32
VCC 3.3V
GND GND
D/C GPIO 2
SDI GPIO 23 (VSPI MOSI)
CS GPIO 4
CLK GPIO 18 (VSPI SCK)
BUSY GPIO 5

All pins can be changed, using an extended constructor:

DISPLAY_CLASS(DC_PIN, CS_PIN, BUSY_PIN, SDI_PIN, CLK_PIN);

(Optional) Suggested additional wiring, for power saving

void setup() {
    // GPIO 15, PNP transistor
    display.useCustomPowerSwitch(15, PNP);

    //Later, when required:
    display.customPowerOff();
    display.customPowerOn();
}

schematic of display connected to ESP32, using PNP transistor as a switch

(Optional) Additional wiring: MicroSD card module

✅ ESP32 uses 3.3V logic. It can connect directly to microSD module.

void setup() {
    // Set MicroSD CS pin
    display.useSD(22);
}
Micro SD Module ESP32
VCC 3.3V
CS GPIO 22
MOSI GPIO 23 (VSPI MOSI)
SCK GPIO 18 (VSPI SCK)
MISO GPIO 19 (VSPI MISO)
GND GND

Some pins are shared with the display.

MOSI and SCK pins can be changed in the display constructor (see above).

CS pin (card) must be set with useSD(cs). Any suitable GPIO pin may be used. Optionally, MISO may also be set, with useSD(cs, miso)