View source for 0.91inch OLED Module

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{{Infobox item
|img=[[File:0.91inch-OLED-Module-1.jpg|300px|alt=0.91inch-OLED-Module|{{Amazon_nolink|default={{#ifeq: {{#urlget:amazon|0}}|{{#urlget:Amazon|0}}| default|}}|url=link=https://www.waveshare.com/0.91inch-oled-module.htm}} | 0.91inch OLED Module]]
|caption=0.91inch OLED Module, I2C interfaces, 
|category=[[:Category:OLEDs / LCDs|OLEDs / LCDs]], [[:Category:OLED|OLED]]
|brand=Waveshare
|{{#ifeq: {{#urlget:amazon|0}}|{{#urlget:Amazon|0}}| default|}}=display
|website_cn=[http://www.waveshare.net/shop/0.91inch-OLED-Module.htm 官方中文站点]
|website_en=[https://www.waveshare.com/0.91inch-oled-module.htm Waveshare Website]
|interface1 = I2C
|related=
{{Product List|OLEDs / LCDs/OLED}}
}}
=Overview=
== Introduction ==
0.91inch Module, I2C interfaces, provide Raspberry Pi, STM32, Arduino demos.

{{Amazon|{{#ifeq: {{#urlget:amazon|0}}|{{#urlget:Amazon|0}}| default|}}=display
|More = [https://www.waveshare.com/0.91inch-oled-module.htm More]}}

==Specification==
*Operating voltage: 3.3V/5V
*Interface: I2C
*Controller: SSD1306
*Resolution: 128x32
*Dimension: 36 x 12.5 (mm)

==Pinout==
{|border=1; style="width:700px;text-align:center" align="center"; 
|-style="background:#0000ff; color:white;" align="center"
|PIN||Description
|-
|VCC||3.3V/5V Power input
|-
|GND||Ground
|-
|SDA||Data input
|-
|SCL||Clock input
|}
'''PS''': This module has only I2C interface and only four pins

==LCD and the controller==
SSD1306 is a 128*64 pixel OLED controller, but this OLED only has 128*32 pixels, so this screen only uses the first half of the SSD1306 buffer area.<br />
The OLED supports 8bit 8080 parallel, 8bit 6800 parallel, three-wire SPI, four-wire SPI and I2C communication methods, but considering the size of the module and in order to save the IO resources of the microcontroller, the first four communication methods are discarded. Only supports I2C communication method.

==Working Protocol==
[[file:0.91inch_oled_module_i2c.png|800px]]<br />
Note: In I2C communication, first send a 7bit slave device address + 1bit read and write bits, and wait for the response from the device.<br />
After the slave device responds, it then sends a control byte, which determines whether the byte sent later is a command or data, and then waits for the slave device to respond.<br />
After the slave responds again, if senting command, only a one-byte command is sent. If sending data, only one byte can be sent, or multiple bytes of data can be sent in succession, depending on the situation.<br />
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{{0.91inch-OLED-Module-RaspberryPi-Guides}}
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{{0.91inch-OLED-Module-Arduino-Guides}}
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<div class="tabbertab" title="Guides for STM32">
{{0.91inch-OLED-Module-STM32-Guides}}
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<div class="tabbertab" title="Resources">
=Resources=
==Document==
*[https://www.waveshare.com/w/upload/2/2a/0.91inch_OLED_Module_Schematic.pdf Schematic]
*[https://www.waveshare.com/w/upload/2/2c/OLED_Module_Code.7z Code]
*[[:File:SSD1306-Revision_1.1.pdf | SSD1306 datasheet]]

==Software==
*[https://{{SERVERNAME}}/w/upload/7/78/LcmZimo.zip lcd ]
*[https://{{SERVERNAME}}/w/upload/b/bd/Image2Lcd2.9.zip Image2Lcd ]

=FAQ=
{{FAQ|Why does not the OLED module turn on when it is connected to the power supply?
|OLED does not have a backlight, and the display is self-illuminating. Only connect VCC and GND, the OLED will not light up. Program control is required to brighten the OLED.
}}
{{FAQ|What should I pay attention to when using this OLED module?
|1. Be careful not to connect the power supply in reverse.<br/>
2. The same picture cannot be displayed for a long time, otherwise, it will produce afterimages and cause damage to the OLED.<br/>
}}


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