Hello all this is my first post,
I am trying to get a HCMS-3962 dot matrix to work with my Uno. I am using the LedDisplay library. So far all I get is the display to flash some of the string of letters once then nothing else. I am thinking my problem has to do with the OSC and SEL pins as I am not sure exactly what these pins require. Also I noticed the 3.3v is showing more like 4.5v, this is within spec for the HCMS but I am wondering if this is something that is expected?
Elegoo Uno R3
Arduino IDE 2.3.2
Windows 10
/*
HCMS Display
Language: Arduino/Wiring
Displays a string on an Avago HCMS-297x display
Scrolls the current display string as well.
Anything you send in the serial port is displayed
when the Arduino receives a newline or carriage return.
String library based on the Wiring String library:
http://wiring.org.co/learning/reference/String.html
created 12 Jun. 2008
modified 11 March 2010
by Tom Igoe
*/
#include <WString.h>
#include <LedDisplay.h>
#define maxStringLength 180 // max string length
// Define pins for the LED display.
// You can change these, just re-wire your board:
#define dataPin 6 // connects to the display's data in
#define registerSelect 7 // the display's register select pin
#define clockPin 8 // the display's clock pin
#define enable 9 // the display's chip enable pin
#define reset 10 // the display's reset pin
#define displayLength 4 // number of chars in the display
// create am instance of the LED display:
LedDisplay myDisplay = LedDisplay(dataPin, registerSelect, clockPin,
enable, reset, displayLength);
int brightness = 15; // screen brightness
String displayString; // the string currently being displayed
String bufferString; // the buffer for receiving incoming characters
void setup() {
Serial.begin(9600);
// set an initial string to display:
displayString = "ABCDEFGHIJKLMNOPQRZTUVWXYZ";
// initialize the display library:
myDisplay.begin();
// set the display string, speed,and brightness:
myDisplay.setString(displayString.c_str());
myDisplay.setBrightness(brightness);
}
void loop() {
// get new data in from the serial port:
while (Serial.available() > 0) {
// read in new serial:
getSerial();
}
// srcoll left and right:
/*if ((myDisplay.getCursor() >= 0) ||
(myDisplay.getCursor() <= -(myDisplay.stringLength() - 8))) {
myDirection = -myDirection;
delay(1000);
}
*/
if (myDisplay.getCursor() <= -(myDisplay.stringLength() - 4)) {
// when the string reaches the end, stop and then fade out
delay(500);
for (int n=brightness; n >= 0; n--) {
myDisplay.setBrightness(n);
delay(50);
}
// start the string back from the beginning
myDisplay.setCursor(0);
myDisplay.scroll(0);
// fade back in
for (int n=1; n <= brightness; n++) {
myDisplay.setBrightness(n);
delay(25);
}
delay(500);
return;
}
myDisplay.scroll(-1); // direction of scrolling. -1 = left, 1 = right.
delay(100);
}
void getSerial() {
// get a new byte in the serial port:
int inByte = Serial.read();
switch (inByte) {
case '\n':
case '\r':
// if you get a newline,
// copy the buffer into the displayString:
displayString = bufferString;
// set the display with the new string:
myDisplay.setString(displayString.c_str());
// set the cursor, so the old string fade away now
myDisplay.setCursor(-1000);
// clear the buffer:
bufferString = "";
break;
default:
// if you get any ASCII alphanumeric value
// (i.e. anything greater than a space), add it to the buffer:
if (inByte >= ' ') {
if (bufferString.length() < maxStringLength) {
bufferString.concat(char(inByte));
}
}
break;
}
}
Hopefully I included all relevant data.