microcontroller Digital bargraph display driver circuit

Posted on Feb 7, 2014

For a project I need to display a progress bar of the activity performed by my MCU. For this purpose I am going to use a bargraph display, but the problem is that bargraph display driver driver IC LM3914 uses analog input where as MCU produces a digital output. How can I display a value on bargraph using digital input instead of analog The bargra

microcontroller Digital bargraph display driver circuit
Click here to download the full size of the above Circuit.

ph should display values from lower to higher and higher to lower. Schematics will be highly appreciated. I only have two data pins available on uC (PIC16F84a) to drive a Bargraph display, and IO expander will increase the cost of system. I tried IC 4017 for the purpose, but it provides only one ON pin at a time.

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