Tag Archives: arduino

Arduino LCD: LiquidCrystal_I2C library

Posted on April 26, 2015 by waime

A LiquidCrystal LCD (Liquid Crystal Display) can be used in two ways: The normal way, with a lot of outputs (6) and wires (10). The I2C-way, with only 2 data-lines (SDA and SCL) and 2 powerlines (+5V, GND). The normal … Continue reading →

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Ping Pong: 8×8 Led Display with MAX7219

Posted on April 7, 2015 by waime

What is a MAX72xx-chip? The datasheet says: The MAX7219/MAX7221 are compact, serial input/output common-cathode display drivers that interface microprocessors (µPs) to: bar-graph displays (V-meter-bar), 7-segment numeric LED displays of up to 8 digits, 64 individual LEDs (LED-cube). Without the MAX72xx, … Continue reading →

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7-segment display + kitchen timer

Posted on March 15, 2015 by waime

This is a common anode 7-segment-display with 12 pins. Wiring for the MAX7219 (http://playground.arduino.cc/Main/MAX72XXHardware): The MAX7219 is only working with common-cathode-devices due to the internal workings of sinking current for each segment to the ground. 11-3 are the segments SegA-SegDP. … Continue reading →

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