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1 Consider replacing transistor through-holes with sockets or with a 7-segment display with LED backlight 128x64 RS-232 I2C or SPI http://www.lcd-module.com/fileadmin/eng/pdf/grafik/edip320-8e.pdf LCD display 320x340 RS-232 I2C or SPI http://www.lcd-module.com/fileadmin/eng/pdf/grafik/edip128-6e.pdf LCD-graphical display with a diode matrix to select segments from each step. Could.

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