IoT example wiring 1.54inch e-Paper to Wemos D1 Mini:
BUSY->D6(MISO), RST->D4, DC->D3, CS->D8(SS), CLK->D5(SCK), DIN->D7(MOSI), GND->GNG, 3.3V->3.3V
SHT_SCL->D1, SHT_SDA->D2, 5V->300k->A0, D0->0.1k->RST(deep sleep wakeup)
BUSY wired to MISO to free D2 for 2-wire SHT31
2.9inch example:
BUSY->D2, RST->D4, DC->D3, CS->D8(SS), CLK->D5(SCK), DIN->D7(MOSI), GND->GND, 3.3V->3.3V