This is another illustration how to wire the HT621 driven 6 Digit 7 Segment LCD Display on Microcontroller. This module is widely used in multi-meter, voltage monitor, solar power monitor, clock, thermometer, electronic measuring device, automotive, etc. this module is compatible in your favorite Microcontroller using 3 wire SPI communication and it has a backlight suitable in dark environment. This module runs on 4.7~5.2V DC 0.4mA without back-light and 4mA with back-light.
Required Components
- Arduino Microcontroller, ESP8266 12, 12E, ESP8266 NodeMCU, ESPDuino, WeMos, ATMEGA328 16/12, ATMEGA32u4 16/8/ MHz, ESP8266, ATMEGA250 16 MHz, ATSAM3x8E, ATSAM21D, ATTINY85 16/8 MHz (Note: The Diagram below is using NANO. If your using other MCU please refer to the respective pin-outs
- 6 Digit 7 Segment 2.4 Inch LCD Display Module
- Jumper Wires / DuPont Wire
Wiring Guide
Source Code
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#define CS 13 //Pin 13 as chip selection output #define WR 12 //Pin 12 as read clock output #define DATA 7 //Pin 7 as Serial data output #define CS1 digitalWrite(CS, HIGH) #define CS0 digitalWrite(CS, LOW) #define WR1 digitalWrite(WR, HIGH) #define WR0 digitalWrite(WR, LOW) #define DATA1 digitalWrite(DATA, HIGH) #define DATA0 digitalWrite(DATA, LOW) #define sbi(x, y) (x |= (1 << y)) #define cbi(x, y) (x &= ~(1 <<y )) #define uchar unsigned char #define uint unsigned int //定义HT1621的命令 #define ComMode 0x52 //4COM,1/3bias 1000 010 1001 0 #define RCosc 0x30 //1000 0011 0000 #define LCD_on 0x06 /1000 0000 0 11 0 #define LCD_off 0x04 #define Sys_en 0x02 //1000 0000 0010 #define CTRl_cmd 0x80 #define Data_cmd 0xa0 /*0,1,2,3,4,5,6,7,8,9,A,b,C,c,d,E,F,H,h,L,n,N,o,P,r,t,U,-, ,*/ const char num[]={0x7D,0x60,0x3E,0x7A,0x63,0x5B,0x5F,0x70,0x7F,0x7B,0x77,0x4F,0x1D,0x0E,0x6E,0x1F,0x17,0x67,0x47,0x0D,0x46,0x75,0x37,0x06,0x0F,0x6D,0x02,0x00,}; //0 1 2 3 4 5 6 7 8 9 char dispnum[6]={0x00,0x00,0x00,0x00,0x00,0x00}; void SendBit_1621(uchar sdata,uchar cnt) { //data cnt HT1621 uchar i; for(i=0;i<cnt;i++) { WR0; if(sdata&0x80) DATA1; else DATA0; WR1; sdata<<=1; } } void SendCmd_1621(uchar command) { CS0; SendBit_1621(0x80,4); SendBit_1621(command,8); CS1; } void Write_1621(uchar addr,uchar sdata) { addr<<=2; CS0; SendBit_1621(0xa0,3); SendBit_1621(addr,6); SendBit_1621(sdata,8); CS1; } void HT1621_all_off(uchar num) { uchar i; uchar addr=0; for(i=0;i<num;i++) { Write_1621(addr,0x00); addr+=2; } } void HT1621_all_on(uchar num) { uchar i; uchar addr=0; for(i=0;i<num;i++) { Write_1621(addr,0xff); addr+=2; } } void Init_1621(void) { SendCmd_1621(Sys_en); SendCmd_1621(RCosc); SendCmd_1621(ComMode); SendCmd_1621(LCD_on); } void displaydata(int p) { uchar i=0; switch(p) { case 1: sbi(dispnum[0],7); break; case 2: sbi(dispnum[1],7); break; case 3: sbi(dispnum[2],7); break; default:break; } for(i=0;i<=5;i++) { Write_1621(i*2,dispnum[i]); } } void setup() { pinMode(CS, OUTPUT); // pinMode(WR, OUTPUT); // pinMode(DATA, OUTPUT); // CS1; DATA1; WR1; delay(50); Init_1621(); HT1621_all_on(16); //1621 delay(1000); HT1621_all_off(16); //1621 delay(1000); displaydata(1);//light on the first decimal point starting from the right side dispnum[5]=num[5]; dispnum[4]=num[4]; dispnum[3]=num[3]; dispnum[2]=num[2]; dispnum[1]=num[1]; dispnum[0]=num[0]; sbi(dispnum[5],7); //cbi(dispnum[5],7); sbi(dispnum[4],7); //cbi(dispnum[4],7); sbi(dispnum[3],7); //cbi(dispnum[3],7); //Write_1621(0,num[0]); //Write_1621(2,num[28]); //Write_1621(4,num[2]); //Write_1621(6,num[28]); //Write_1621(8,num[4]); //Write_1621(10,num[5]); } void loop() { // you can place your main code here to run repeatedly } |
Wiring the 6 Digit 7 Segment 2.4 Inch HT1621 LCD Display Module on Microcontroller
Greetings!
I have a Display of this but it is with 5 digits and I would like to do something, like a clock but I do not have enough knowledge; I would like some code and / or some help; Thank you
Hi Daniel,
Just look for the matrix address on each segment. for example if it is 5 digital you just going to change char to display to 5 digit. see below example. look also the datasheet of your LCD for your reference because each device has its own address and mapping, depends on the manufacturer.
Change this to 5 digit >>c har dispnum[5]={0x00,0x00,0x00,0x00,0x00};
OK friend! I’ll try; I would like a clock code with arduino but thanks for the reply!
Greetings friend!
I did as you told me, but all I can see on the Display is only a Segment (risk) in one of the Digits; Could you give me more tips?
I would like to use this Display to show the Time but I do not have enough knowledge!
Thank you very much
Yes Enrico! That way it worked with this code but, and to make a simple clock with the flashing dots like I would? Thank you
Hello how can we turn down the LED brightness? It is way to bright.
hI!, just attach a resistor to LED pin or you can also hookup a Potensiometer attach to LED Pin. ;)
Which value for the resistor ?
There is no resistor in the diagram above, however you can use 1k…
Can you Give me your gmail ?
I request you that I have to drive 3 lcd with HT1621IC.
Here is the link.
https://www.instructables.com/How-to-Wire-the-6-Digit-7-Segment-24-Inch-Ht1621-L/
How to write code for 4 digit lcd?
Hello,
I am using the HT1621B with a plain glass LCD, 3.5 Digit. This display had only 1 COM , whereas the HT1621 had provision for 4 COMs. Can you suggest what Init parameters would be suitable ?
#define RCosc 0x30 //1000 0011 0000
I dont know if this is an error, but as per datasheet for internal OSC it should be 0x18
Cheers !!