Comments (4)
Looks like the default I2C pins are used internally on ESP32-Cam. You can select alternate pins with bool begin(int sda=-1, int scl=-1, uint32_t frequency=0);
.
Try changing this:
SSD1306AsciiWire oled;
void setup() {
Wire.begin();
Wire.setClock(400000L);
To:
SSD1306AsciiWire oled;
// select your pin choice here
#define I2C_SDA 14
#define I2C_SCL 15
void setup() {
Wire.begin(I2C_SDA , I2C_SCL , 400000L);
The ESP32 has two I2C ports.
You can use the second port like this
SSD1306AsciiWire oled(Wire1);
// select your pin choice here
#define I2C_SDA 14
#define I2C_SCL 15
void setup() {
Wire1.begin(I2C_SDA , I2C_SCL , 400000L);
I compiled the above but didn't test them on an ESP32. Let me know if this works. Its been years since I used an alternate port.
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It works just fine! Thanks Bill. For my project, the ESP32-Cam pins are all used (Camera, SD and two external sensors) so I set the only two remaining free pins, RX and TX (1 and 3 on ESP32), as SDA and SCL. After uploading the firmware to the board, they can be used as I2C pins. Thanks again.
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Is it possible to use a 128x128 OLED like this?
from ssd1306ascii.
No the SD1306 controller only supports up to 128x64.
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Related Issues (20)
- When using a display with more than 64 pixels in the Y direction, the lcdHeight parameter is ignored. HOT 6
- Changing I2C pins HOT 1
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- Is there any function that returns data from the display? (to verify the display is somewhat functional in init) HOT 2
- Issues Initializing Multiple OLEDs HOT 4
- 1.3" SSH1106 Compatibility HOT 1
- How to make 3 lines of text as large as possible HOT 2
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- Is there a way to programmatically determine what Font is current? HOT 5
- Ticker Text demo question / maybe issue HOT 5
- How to use u8g2_font_unifont_t_chinese Chinese character library HOT 2
- degrees celsius symbol HOT 3
- 70x42 OLED ? HOT 8
- Begin() return error if OLED not connected/found. HOT 2
- Text height HOT 2
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