Lcd st7063c on teensy 3.2

[kbrontox]

Hi everyone my name is joe and im traying to make work this lcd 202a controller ST7063c 20x2 lines on a teensy 3.2
i wanna do a pinnumber counter of 4 or 6 digits.

i try the example lcdliquidcristal conecting the pins 2,3,4,5,11,12 but dont show nothing on the lcd.
i search for something related to the st7063c but no luck , any one can help me

the lcd power up but nothing to show

 

[KurtE]

Hi Joe,

As mentioned in the forum rules at top of page, it often helps us to see the code to get an idea of what is going on.

Also helps to post a picture of your setup, as this often helps to uncover simple issues, like trying to use a breadboard and not have the Teensy soldered to the pins or, maybe missing wires. Like power or ground.

Also a link to the actual display, would also help as there might be some hints up on their product page, like does their display require 5v...

Again welcome

 

[kbrontox]

this the display datasheet
https://cdn.displaytech-us.com/sites/default/files/display-data-sheet/202A%20series-v21.pdf

this is the configuration i try


and this my setup so far the cable pin 3 can be conected direct to the power?

cables 14 to pin 2 on teensy
cable 13 to pin 3
cable 12 to pin 4
cable 11 to pin 5
cable 4 to pin 11
cable 6 to pin 12
cable 1 to grnd
cable 2 to power
cable 5 to grnd

// include the library code:
#include <LiquidCrystal.h>

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup() {
  // set up the LCD's number of rows and columns: 
  lcd.begin(16, 2);
  // Print a message to the LCD.
  lcd.print("hello, world!");
}

void loop() {
  // set the cursor to column 0, line 1
  // (note: line 1 is the second row, since counting begins with 0):
  lcd.setCursor(0, 1);
  // print the number of seconds since reset:
  lcd.print(millis()/1000);
}

 

[larry_berlin]

Hello,

you should not connect cable3 direct to power..
Use instead a 10K potentiometer between power and ground, connect the wiper with cable 3. This is to set the contrast. Maybe you don't see anything for this reason.

Also this LCD is for 5 Volt power supply. teensy3.2 has 3.3V logic, so even though it is 5V compatible, communication might not work. Maybe use teensy 2 instead.

 

[kbrontox]

great

ok ive try to find one petentiometer and try thanks alot man

Hello,

you should not connect cable3 direct to power..
Use instead a 10K potentiometer between power and ground, connect the wiper with cable 3. This is to set the contrast. Maybe you don't see anything for this reason.

Also this LCD is for 5 Volt power supply. teensy3.2 has 3.3V logic, so even though it is 5V compatible, communication might not work. Maybe use teensy 2 instead.

 

[kbrontox]

now the 2nd part of the project

i wanna run this code and see the 4 numbers any onecan help me how i set up the lcd and the code together

const int ledPin = 13; // choose the pin for the LED
int counter = 0;
int fakecounter = counter;
char pin[]="xxxx";

void setup() {
  pinMode(ledPin, OUTPUT); // declare LED as output
  delay(10000);
}

void loop(){
  keyboard_modifier_keys = 0;
  if (counter <= 9999){
    delay(8000);
    digitalWrite(ledPin, LOW);
    delay(5500);
    digitalWrite(ledPin, HIGH);
    sprintf(pin, "%04d", fakecounter);
    //sending first digit
    Keyboard.press(pin[0]);
    delay(450);
    Keyboard.release(pin[0]);
    delay(420);
    //sending second digit
    Keyboard.press(pin[1]);
    delay(398);
    Keyboard.release(pin[1]);
    delay(510);
    //sending third digit
    Keyboard.press(pin[2]);
    delay(421);
    Keyboard.release(pin[2]);
    delay(423);
    //sending forth digit
    Keyboard.press(pin[3]);
    delay(430);
    Keyboard.release(pin[3]);
    delay(525);
    //sending enter
    Keyboard.press(KEY_ENTER);
    delay(305);
    Keyboard.release(KEY_ENTER);
  }
  //reached 4 digit PIN max value
  if (counter > 9999){
    for (int blinkies = 0; blinkies < 8; blinkies++) {
      digitalWrite(ledPin, HIGH);
      delay(20);
      digitalWrite(ledPin, LOW);
     delay(200);
    }
    delay(6000);
  }
  ++counter;
  fakecounter = counter;
}