Im trying to figure out how to drive (manually-bitbang) a HT1621B LCD driver IC. It is capable of driving multiplexed LCDs. They are very cheap, but only in smd form, which is a bit of a challenge to solder all its tiny 48 pins. See youtu.be/xwRXpbxjLcw - you can skip through the movie since it's a…

I tried last night, I couldnt sleep right because of it, I tried this morning and everything boils down to this: n0(0);n0(2);n0(4); delay(t); Clear(); n1(0);n1(2);n1(4); delay(t); Clear(); n2(0);n2(2);n2(4); delay(t); Clear(); We need to add all 3 numbers at once to the display,…

The BlinkWithoutDelay boils down to 2 things: Is it time to blink? Do blink This is the code for Is it time to blink?: if (currentMillis - previousMillis >= interval) { previousMillis = currentMillis; And here the code for Do blink: if (ledState == LOW) { ledState = HIGH; …

I managed to make something...not exactly as I imagined but... good enough. I was actually thinking at a clock code mechanism how it will update sec,min,hrs, so I had this idea that I walked on it. The idea is also to keep all 3digits activated in the same time. Also, another blast from the past,…

[image] Rintin: Is it time to blink? Do blink The code is very easy to understand and read, no problem there. The problem was adapting to my problem. The biggest problem was to deal with the n0(0); which is a void function so in this cases, we need to go around it and use something else t…

[image] q12: The biggest problem was to deal with the n0(0); which is a void function The problem with this is that the pattern it is writing is in the function name. That's why I suggested the setDigit() function.

Hi @Rintin (and happy new year 2025) I mentioned in the OP, that I want to drive this HT1621+LCD through a Parallel EEPROM ATMEGA. Specifically AT28C64 . Because I have 10pcs of them. The code so far, in this discussion, is really great, truly. I also dig a few weeks ago into output from UNO R3…

[image] q12: I mentioned in the OP, that I want to drive this HT1621+LCD through a Parallel EEPROM ATMEGA. Specifically AT28C64 . Not sure what you are trying to do here. Replacing the Arduino with state machines and 74xx logic chips? [image] q12: I want to manually drive the pins instea…

[image] Rintin: Please don't confuse shiftOutBits() with the framework provided shiftout(). you made that function ... right. my mistake.

Please take a look at post #8 for the implementation of shiftOutBits().

How to drive manually HT1621B LCD driver IC?

Other Hardware Displays

q12 December 22, 2024, 10:45am 54

Here the entire file with everything I did so far:
LCDB2.ino (10.0 KB)

Topic		Replies	Views
HT1621 basic driver code Programming	23	2253	August 15, 2024
HT1621 basic driver code_p2 Programming	12	255	July 18, 2025
LCD coding, tips? Custom LCD Displays	8	1017	June 18, 2022
Custom LCD & Arduino Displays	22	1068	September 17, 2023
4 digit 7 segment display driver General Guidance	29	778	December 2, 2025

How to drive manually HT1621B LCD driver IC?

Related topics