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Step IDs with a 7-segment display with a 7-segment display with LED backlight 160x104 RS-232 I2C or SPI LCD 4x10 character 3.3V VDD I2C or SPI LCD graphical display 480x272 16-bit colour with LED and photoresistor 3 Lead Plastic Package OnSemi CASE 100CY, light-direction upwards, see https://www.everlight.com/file/ProductFile/ITR1201SR10AR-TR.pdf reflective opto couple photo coupler package for Kodenshi SG-105 with PCB locator.

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