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I bought the Adafruit 128x64 OLED Bonnet and tested it with the demo program. Unfortunately the luminosity is very low and it is not satisfying:

enter image description here

I have tried to adjust the contrast from 0 to 255 but the highest I can get is far from ideal.

Is this normal ?

In the datasheet it is said IREF should be equal to 12.5 uA, but I can measure a 390 kOhm resistor:

I = U / R = (VCC - 2.5) / 390k = (3.3 - 2.5) / 390'000 = 2 uA

I tried to change this resistance to 64k but I get roughly the same luminosity

What did I miss ?

import board import busio from digitalio import DigitalInOut, Direction, Pull from PIL import Image, ImageDraw import adafruit_ssd1306 i2c = busio.I2C(board.SCL, board.SDA) disp = adafruit_ssd1306.SSD1306_I2C(128, 64, i2c) disp.inverse(1) disp.contrast(250)
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