Silent Radio LED sign to Arduino


Posted on Feb 6, 2014

Working on the brightness problem, I know that the 4017 design did not work well because there was no way to turn off the sign while updating the shift registers. As a result I went back to having the Arduino directly drive the TIP120 drivers. Another possible solution might be to use an ULN2003`s as a level shifter. That would require a 6 or 7 vo


Silent Radio LED sign to Arduino
Click here to download the full size of the above Circuit.

lt power supply as well. I wanted to stay with a 5 volt power supply. I have observed that the Cadaces modules use 22 ohm current limiting resistors. The Silent Radio signs use 100 ohm resistors. Maybe changing the resistors is a better solution Here is the schematic. On the scrolling issue, I have suspects that the sign scrolls backwards because it is upside down. So I changed two lines of code so the sigh would work upside down and viola, it works. It now scrolls from right to left like it should have been doing. //*// // Name : Silent Radio Driver // // Author : Bob Davis // // Date : 25 April, 2011 // // Version : 1. 0 // // Based on work of Hari Wiguna - // //* // Pins for the row drivers int row1Pin = 1; int row2Pin = 2; int row3Pin = 3; int row4Pin = 4; int row5Pin = 5; int row6Pin = 6; int row7Pin = 7; // Pins for column shift registers int clockPin = 8; int dataPin = 9; // Set the pins to output to the circuit void setup() { pinMode(clockPin, OUTPUT); pinMode(dataPin, OUTPUT); pinMode(row1Pin, OUTPUT); pinMode(row2Pin, OUTPUT); pinMode(row3Pin, OUTPUT); pinMode(row4Pin, OUTPUT); pinMode(row5Pin, OUTPUT); pinMode(row6Pin, OUTPUT); pinMode(row7Pin, OUTPUT); } //= B I T M A P = //Bits in this array represents one LED of the matrix // 8 is # of rows, 7 is # of LED matrix we have byte bitmap[8][12]; // Change the 7 to however many matrices you want to use. int numZones = sizeof(bitmap) / 8; // I will refer to each group...




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Diode tester
    Positive-regulator
    Tone ControlCircuit
    pcb design Need second set of eyes on 555 50% duty cycle soldered protoboard
    in circuit transistor checker
    Modelica Magnetic FluxTubes Solenoid Actuator
    ATX Power Switch Substitute
    Motion Detector
    Traffic intersection light automatic controller circuit
    Practical sound level monitor circuit diagram



    Top