BikeLightDuino

8x8 Matrix led example

This code shows a series of sequences for 8x8 led matrix format designed to be used as a bicycle's backlight. It's serial controlled using: L / H / R / A / V / B / S commands

• Youtube Video: https://www.youtube.com/watch?v=1YXSK_jz2z0

• Thingiverse: https://www.thingiverse.com/thing:3816977

Requeriments:

• Arduino nano vX.0
• 8x8 Matrix Led
• HC-05 or HC-06 (Bluetooth device)
• Photoresistor 10K/100K (don't really care) - Connect to: VIN and A4 (SENSOR_PIN)
• A resistor 10 times bigger than the photoresistor - Connect to: GND and A4 (SENSOR_PIN)
• 8 220ohm~1k Ohm (to Rows or Cols, don't use directly)

This code provide 4 display modes:

• Hold [H]: Runing

• Left [L]: Turn Left

• Right [R]: Turn Right

• Stop [A]: ...before i crash/die

Other features:

• [S]: Serial On/Off

• [V]: Needs less light to turn on

• [B]: Needs more light to turn on

All comands must be sended using the serial port on pin 10 (RX) and 11 (TX), you could connect a wifi or bluetooth to control it:

    SoftwareSerial SerialBT(10, 11); // RX, TX

Pinout:

    // Define all columns and rows pins
        #define COL_1 0
        #define COL_2 1
        #define COL_3 12
        #define COL_4 13
        #define COL_5 A0
        #define COL_6 A1
        #define COL_7 A2
        #define COL_8 A3
        #define ROW_1 2
        #define ROW_2 3
        #define ROW_3 4
        #define ROW_4 5
        #define ROW_5 6
        #define ROW_6 7
        #define ROW_7 8
        #define ROW_8 9

        #define SENSOR_PIN A4

This project use a photoresistor in pin A4 to turn on/off the matrix it can be controled using V and B command to ajust the intensity in real:

        int sensorValue = analogRead(SENSOR_PIN);

Note: i aren't use EEPROM, if you want to save the config you must programm that feature.

Note2: You need to send all command without any kind of new line