Cr2032 desk clock needs your opinions

Other Hardware Displays
1

Hello.
I have a small desk clock project.
I want to make it run on cr2032 battery.
Battery can be change by 5-6 months.
I need some advice about display. This clock will only show the hours and minutes.
Planning to use attiny85 . 2 buttons for setting time. And a smd led whic will blink every 30seconds or maybe 1 minute.

The problem i am having i can not find the right display for my project. The display must be consume low energy, must be small. must to work with cr2032. i have read a lot of similar projects. They re mostly using bigger batteries and oled displays. but i want to use cr2032. the size is first priority.
As i can see e ink displays can't work on cr2032.
If you have any suggestion about my project pls write here.I would even be very happy if you could share the projects you would like me to review.

2

For a display with the lowest consumption, I can only think of this type of LCD.

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3

do you got a name?
and is there any type of this with 4 digits and can work with 3v?

4
5

this is looking great i will try to buy this im not in Usa. Let me check the pover consume. But it is looks like it has not voltage tolarance. cr2032 is 3.3v when new. and at 2.7 when it is empty.

6

It is a 1/4 MUX and 1/3 bias LCD do you know how to drive it?

7

no i have no idea. i haven't use this kind of lcd before. but shipment kinda expensive for this.

https://tr.aliexpress.com/item/1005003060952508.html is this same kind of product?

8

Yes it looks the same.
If you have never used this kind of LCD before, I suggest you study up on how to drive it before you buy one.

9

thank you. i will study first. i would like to see some examples if you can share. how is the energy consuming with this lcd? do you have any idea?

10

They don' state in in the datasheet but typically just a few uA

11

looks pretty good for me. i only need examples about drive this kind of lcd.

12

Search for LCD drive 1/4 mux 1/3 bias

13

You might consider this one, it's easier to drive but has 40 pins.
https://www.aliexpress.us/item/3256802992196532.html

14

Thank you i will consider but i still need some guide about drive.

15

see post #12

16

Use a separate power supply for the E-ink display.

17

There are similar displays with the HT1621 driver, for the control of which there is also an Arduino library.

The HT1621 is a 128 pattern (32x4), memory mapping, and multi-function LCD driver. The S/W configuration feature of the HT1621 makes it suitable for multiple LCD applications including LCD modules and display subsystems. Only 3 or 4 lines are required for the interface between the host controller and the HT1621. The HT1621 contains a power down command to reduce power consumption. Operating voltage is 2.4 - 5.2 V.

18

it is not possible because of the nature of the project.

19

hi thank you for advise actually i have found this one too still looking for 4 digit one if there is.

edit : i found something like this https://tr.aliexpress.com/item/32924015493.html it is bigger than my plan but at least an option.

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