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Revisiting the digital thermometer clock

29/5/2016

5 Comments

 
The digital thermometer clock has been a real success. Many people have contacted me to say they've built it successfully; most of those people had no issues in construction. However, the performance of the clock; mainly it's long term accuracy has been an issue. The DS1307 RTC chip was good (and cheap at the time), but it's not great in a clock like this and constantly seems to need adjusting.

A little while ago I stumbled on EBay suppliers selling DS3231 modules for around £1.50 each for a complete module so I purchased a couple to experiment with and see how easy they are to use.

Today I upgraded my clock to use that module. A little bit of fiddling with the original PCB is required but it can adapted relatively easily. A few changes were also required to the clocks original firmware.

Anyway it's been running on the bench for a couple of hours without any problem, so I'll publish upgrade details soon. I'm also going to re-publish an updated version of the original design.

Details on how to update the original design can be found here.
5 Comments
Popa Raul
31/5/2016 03:47:45 am

Good job Joe. It will display temperature : positive temp 24⁰C, negative temp -8⁰C and -24⁰ :) Thank you

Reply
World Tracker Alternatives link
17/6/2016 07:42:43 pm

Hey Joe,

Very cool way to update your digital thermometer clock. I love doing little experiments like this and for just a few dollars, it can't hurt.

Would love to see your results.
Ben

Reply
John link
7/3/2017 05:57:15 am

This is very interesting. Will give it a try. Appreciate for sharing.

Reply
Kasdon link
26/5/2017 02:59:13 pm

This seems like it would be a fun mini project!
Thanks for sharing this.

Reply
charudatt
6/12/2017 08:55:02 pm

Is there a change you could share a project to interface a BME280 sensor with a PIC and Proton Basic.

Reply



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    A software and hardware engineer who loves retro computers.

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