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waveshareteam / e-Paper

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2.7 inch HAT rev2.1 on arduino, nothing happen #143

Closed MonsterPoney closed 3 years ago

MonsterPoney commented 3 years ago

Hi, I followed the connections on the wiki and the resources section led me here, but after several tried with all epd2in7* projects with an arduino mega2560 and also with an ATMEGA328p, I can't get the screen to work, not even a flicker, nothing happen. With the epd2in7b_V2 project, the monitor wrote init and clear, show array and sleep but no reaction from the screen.

There is nothing to see if the screen work, not even a single blink from an led so I don't even know if the screen was not delivered dead.

MonsterPoney commented 3 years ago

Yeah so, sometimes take a step back and wait for the next day is a wise choice. The wiki say CS pin to D10 on an arduino uno which after consulting the pinout is the SPI/SS pin. However on a MEGA2560, the SPI/SS is on pin 53. Same for the DIN pin, 11 on uno, 51 on mega and CLK pin, 13 on uno, 52 on mega.

So the solution is to change the connection of theses pins and edit the epdif.h file to modify the definition of CS_PIN from 10 to 53.