LED garland on MK ATtiny 2313. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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LED garland on the microcontroller. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Microcontrollers

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This microcontroller led string project is good for beginners. The scheme is distinguished by its simplicity and contains a minimum of elements.

This device controls 13 LEDs connected to the ports of the microcontroller. As a microcontroller, an MK from ATMEL is used: ATtiny231320PI. Due to the use of an internal generator, pins 4 and 5 are used as additional ports of the microcontroller PA0, PA1. The circuit provides the execution of 12 effect programs, 11 of which are individual combinations, and the 12th program is a sequential one-time repetition of the previous effects. Switching to another program is carried out by pressing the SB1 button. Effects programs include running single fire, rising fire, running shadow and more.

(click to enlarge)

The device has the ability to adjust the speed of changing combinations during the execution of the program, which is carried out by pressing the buttons: SB2 - increase the speed and SB3 - decrease the speed, provided that the switch SA1 is in the "Program speed" position. It is also possible to adjust the frequency of the LED burning (from a stabilized glow to a slight flicker), which is carried out by pressing the buttons: SB2 - decrease (to flicker) and SB3 - increase, provided that the SA1 switch is in the "Flicker frequency" position. At switch SA2, the closed position corresponds to the mode for adjusting the speed of program execution, and the open position corresponds to the mode for adjusting the frequency of LED burning.

The numbering order of the LEDs in the circuit corresponds to their firing order when the program is executed. If necessary, the RESET pin can be used for reset, but it is not used as a PA2 port. During programming, the device selected a clock frequency of 8 MHz from the internal generator (fuses CKSEL3..0 - 0100). Although it is possible to use a frequency of 4 MHz (fuses CKSEL3..0 - 0010) with corresponding changes in the time intervals of the circuit.

The type of LEDs indicated in the diagram was used in a prototype, any LEDs with a supply voltage of 2-3 volts are suitable for the circuit, resistors R1-R17 can be used to adjust the brightness of the LEDs.

LED garland on the microcontroller. Photo of the finished device

Documentation (Datashit) for MK ATtiny231320PI

Firmware HEX, as well as program files in assembler, you can download here (30 kb)

Author: Anton Garkusha (AntonIOCifra), gam-rainers[dog]mail.ru; Publication: cxem.net

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