evive has 1 single-color and 2 dual-color programmable LEDs, along with fix LEDs for serial communication, power indication, and battery charging status.
Single Colour Programmable LED
A single color LED is connected to digital pin 13 of Arduino Mega, which is programmable and can be controlled via digitalWrite() or analogWrite() functions.
The following code illustrates the use of digitalWrite() to control LED:
The following code illustrates the use of analogWrite() to control LED:
Dual-colour Programmable LED
Two dual-color programmable LEDs are attached to digital pins 28 and 29 for first LED and digital pin 30 and 31 for the second LED. By controlling the output of one of the pin, you can control one color of the LED and by controlling the second color. Both the LEDs are common cathode LEDs, which means that the common terminal is GND and when the other pins are given HIGH, the LED glows.
The following program illustrates how to use a dual-color LED.
- Serial Communication LED: evive has 4 serial communication channels. For the first channel, a dual-colour LED is connected, which glow when the communication happens from the channel.
- Power Indication LED: This LED glows when evive is powered via any source (Internal battery or external power source).
- Power Indication LED: This LED constantly glows when the internal battery is charging and blinks when there is no internal battery connected to evive.