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asknik2022
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Joined: 26/03/2022
Location: United Kingdom
Posts: 92

Posted: 07:25pm 29 May 2024

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I am trying to configure an ZJY_M242 2.42" OLED via SPI but have no idea if this is set as an SPI or IIC Mode

two unjumpered connections R3 and R5 (?IIC)
one jumpered connection R4 (?SPI)

Also there is no SSD1309 display listed in the manual so can i use SSD1306SPI

The pinouts are labeled
GND
VCC
SCL
SDA
RES
DC
CS

So which pins are SCK and SDI for SPI Setup
Do i need to use pull up/down resistors?

lizby
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Joined: 17/05/2016
Location: United States
Posts: 3150

Posted: 11:01pm 29 May 2024

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Interesting module, if pricy. I would say that SCL is SCK, and SDA is SDI.

But why not try it as I2C and use only 2 pins?

I've long wondered why there wasn't an I2C OLED with the same resolution as the .96-inch ones, but just with bigger pixels.

If this cost half as much, I'd buy some.

PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed

matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 9110

Posted: 08:47am 30 May 2024

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It is unlikely that this display will work with the SSD1306 driver and it is far too expensive to buy one to develop a driver. If you want a large mono 128x64 display then the ST7920 is supported over SPI

lizby
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Posted: 12:09pm 30 May 2024

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matherp said If you want a large mono 128x64 display then the ST7920 is supported over SPI

Thanks for the suggestion, but if the choice is SPI, then the ILI9341s are larger, cheaper, have higher resolution, have full color range, and if desired, have touch (and SD card).

I2C mono only preferable (in certain instances) if the size is 2.2 inches or greater, and the cost is no more than about $3USD.

Maybe power utilization could be a factor--I'm powering a .96" OLED from an ESP32 pin--because it's convenient from a wiring standpoint.

PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed

cosmic frog
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Joined: 09/02/2012
Location: United Kingdom
Posts: 284

Posted: 12:29pm 30 May 2024

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matherp said It is unlikely that this display will work with the SSD1306 driver and it is far too expensive to buy one to develop a driver. If you want a large mono 128x64 display then the ST7920 is supported over SPI

I wasn't aware of this display, but it looks interesting. How is it connected to SPI, it looks like a parallel connection to me?

Link To ST7920

Thanks.

Dave.

phil99

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Joined: 11/02/2018
Location: Australia
Posts: 2135

Posted: 12:56pm 30 May 2024

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This seller includes some of the data-sheet which shows serial or parallel is selected with pin 15.

Scroll down to "view more" and click.

matherp
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Posted: 01:04pm 30 May 2024

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Quote How is it connected to SPI, it looks like a parallel connection to me?

See this thread for wiring
Edited 2024-05-30 23:07 by matherp

cosmic frog
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Location: United Kingdom
Posts: 284

Posted: 02:32pm 30 May 2024

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Thanks for the info. I'll have a look at these.

Dave.

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