Thursday, December 6, 2018

Project: Breathing LED Sleep Indicator using LM358

Eltronicschool. - This is one of project to build breathing LED sleep indicator using LM358 look like shown in Figure 1. The main component in this project is used LM358 IC.

In this project will show you as replica of the iconic breathing pattern used for the “sleep” indicator in Apple computers. But in this design only using popular analog component although it will help using microcontroller to build pulse-wide modulation. In this project we will give beside circuit schematic, we also will give you component are needed and also global description.

Circuit Schematic

Figure 1. Circuit schematic of breathing LED sleep indicator using LM358
(Source: Electroschematics)

Component Part
  1. LM358
  2. Resistors
  3. LED
  4. Transistor BC547
  5. Capacitor

Circuit schematic look like shown in Figure 1 above is breathing LED sleep indicator using LM358.  Electroschematics site describe that the design is centered entirely around one popular dual-operational amplifier LM358 (IC1) to slowly fade a green light-emitting diode (LED1) in a special pattern (the so-called breathing effect). The circuit runs well with a regulated supply voltage of 5 V; higher-level voltages are not recommended. If the two-way jumper (JP1) in the circuit is in “test” mode, the circuit will work as a standalone indicator. But moving the jumper position to “normal” mode, a TTL high-logic signal input is required to enable (EN) the indicator. This option is added deliberately so that we can enable/disable the Sleepy-LED Eye using the existing microcontroller (uC) in a project — just one free I/O port of the concerned uC is needed there. For example, one I/O port of the uC can be programmed to wake-up the Sleepy-LED Eye only when the system is in its standby state.

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