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RE: 555 timer Remote Capacitance Sensor - fluid level, body detector, touch sensor

AE7HD — Thu, 21 Mar 2024 15:01:09 GMT

RE: How to use 555 timer IC for sensor interfacing: Converting the sensor output to frequency

AE7HD — Wed, 20 Mar 2024 16:57:33 GMT

I would not use a ceramic 0.01uF capacitor as they tend to be rather temperature sensitive.

RE: 555 timer Remote Capacitance Sensor - fluid level, body detector, touch sensor

AE7HD — Wed, 20 Mar 2024 12:55:24 GMT

hackaday.io/.../183506-remote-continuous-liquid-level-sensor-555-timer

RE: 555 timer Remote Capacitance Sensor - fluid level, body detector, touch sensor

Gururaj — Wed, 20 Mar 2024 02:27:24 GMT

Hi AE7H,

Very interesting design. Thanks for Sharing. I have few queries. If you could throw some light on them, it would be great.

1. What is the purpose of D2 at the out of 555 (Pin 3)?
2. When CL is not present, Will Arduino keep showing the value of C1 (100pF) ?
3. I am planning to power 555 timer, only when needed through a N-Channel MOSFET trigger by Arduino's Digital PIN. In this case, when can we start measuring Capacitance?
3.1. Should we Poll the "Pulse pin" and when it goes low, start the measurement?
3.2. After powering on, wait for few millisecond (for 555 to start) and then start measuring the capacitance?

4. Normally we take Off time + On Time and then calculate Capacitance. In here, you have mentioned only ON time would be considered. Can you explain more about this concept please.

Thanks in Advance.

Gururaj

RE: Frequency Synthesizer with only 555 Timers

dougw — Tue, 08 Nov 2022 14:59:21 GMT

That is a very cool circuit. Well done.

RE: Winners Announcement: 555 Timer Madness in Honor of 50 Years of 555 Timers!

flyingbean — Sun, 06 Nov 2022 22:25:37 GMT

Congrats to all winners and partitioners. The blogs from all partitioners are very popular in this community. It is my first time to publish a blog and the feedback from the activity was very positive. Be glad to be part of the community.

RE: Frequency Synthesizer with only 555 Timers

dang74 — Fri, 04 Nov 2022 18:58:52 GMT

I had heard that Hans Camenzind, the inventor of the 555 timer was also a pioneer in PLLs. You succeeded in bringing both these concepts together and, based on the scope capture, it looks like you got it to work as well.

RE: Frequency Synthesizer with only 555 Timers

shabaz — Fri, 04 Nov 2022 18:37:17 GMT

Impressive!

Would not have imagined that was possible with just 555's. Great results : )

RE: Winners Announcement: 555 Timer Madness in Honor of 50 Years of 555 Timers!

dang74 — Thu, 03 Nov 2022 16:34:46 GMT

Congratulations to the winners and participants. This project series resulted in a lot of great blogs.

RE: Winners Announcement: 555 Timer Madness in Honor of 50 Years of 555 Timers!

robogary — Wed, 02 Nov 2022 20:15:43 GMT

Wow, thank you E14 community, staff, and judges. This is a huge huge surprise, there are so many good project submissions for 555 Timer Madness, I'm humbled to run with the big dogs ! Thanks for all the support.

RE: Winners Announcement: 555 Timer Madness in Honor of 50 Years of 555 Timers!

baldengineer — Wed, 02 Nov 2022 16:32:57 GMT

Congrats to everyone. These projects were super fun to look into.

Hundreds of years from now, when people talk about the ancient technology of "integrated circuits," I have no doubt pictures of a 555 will be used since it'll be believed that they can do anything. :)

RE: Winners Announcement: 555 Timer Madness in Honor of 50 Years of 555 Timers!

Sudeep AJ — Wed, 02 Nov 2022 12:45:57 GMT

Congratulations to all the winners!

And thank you for the honorable mention.

RE: Winners Announcement: 555 Timer Madness in Honor of 50 Years of 555 Timers!

BigG — Tue, 01 Nov 2022 19:46:07 GMT

Congratulations to all the winners and participants. These project were well timed and all spookingly good.

RE: Winners Announcement: 555 Timer Madness in Honor of 50 Years of 555 Timers!

dougw — Tue, 01 Nov 2022 19:01:04 GMT

Congratulations to the participants and winners. A blast from the past...

RE: Winners Announcement: 555 Timer Madness in Honor of 50 Years of 555 Timers!

genebren — Tue, 01 Nov 2022 18:52:15 GMT

Congratulations to all the winners and participants. This was a fun topic and yielded some great projects. Well done to all!