SAA1064 Arduino bar graph

A quick demonstration of the SAA1064 LED display chip (connected to bar of 16 LEDs), controlled via I2C by my Arduino. The '1064 can control 32 LEDs with the addition of a capacitor and two NPN transistors.
The yellow and green wires are the I2C bus... The bus is shared with a DS1337 real time clock circuit - most of the other junk between the Arduino and SAA1064. The big bunch of blue and white wires are LED cathodes.
The bar is displaying analog voltage from the potentiometer in the foreground, which is read and interpreted by the Arduino. The graph's brightness (and the LCD's as well) is controlled by ambient light, as read by a TEMT6000 sensor (the doodad I cover with my finger and shine a flashlight on in the vid), also read and interpreted by the Arduino. The graph brightness is handled by the SAA1064, while the LCD's backlight is being dimmed directly by the Arduino via a transistor and PWM signal.

Category:

Science & Technology

Tags:

• SAA1064
• LED
• display
• driver
• arduino
• bar
• graph
• diy