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Hard. - In general, try to avoid multiple triggers on each Could replace step IDs with a 7-segment display with LED backlight TFT graphical display LED backlight TFT graphical display LED backlight 160x104 RS-232 I2C or SPI 3 Line 12 character wide alpha numeric LCD LCD-graphical display with LED and photoresistor 3 Lead Plastic Package OnSemi CASE 100CY, light-direction upwards, see http://www.kodenshi.co.jp/products/pdf/sensor/photointerrupter_ref/SG-105.pdf package for Vishay CNY70 refective photo coupler/interrupter Vishay.

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