These are tiny, sharp, and most impressive OLED monochrome displays! Just about 1" diagonal, made of 128x32 individual white OLED pixels, each one is turned on or off by the controller chip.
Another nice visual indicator for the Grove system, with a 10 segment display. 3.3-5V
4 digit displays are usually a 12 pin module. In this Grove gadget, we used a TM1637 to scale down the controlling pins into 2 Grove pins.
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