Blog - All Comments

RE: Laser Shutter Tester

khudam1971 — Tue, 01 Jun 2021 14:07:29 GMT

Hi! sokol07.I liked your project Laser Shutter Tester v2. 1 I want to repeat it for testing my camera.I have acquired the necessary material to repeat your project.Unfortunately, I can't program the Arduino Uno, it throws an error.Could you please help me in repeating your Arduino Uno programming sequence project.I will be grateful to you!

RE: A Crystal Clock with 1 Transistor - the Pierce Oscillator

Jan Cumps — Tue, 23 Feb 2021 19:30:00 GMT

I won a shopping cart with this project. Here are some of the goodies I ordered.

LF411CDLF411CD precision high-speed JFET-input Operational Amplifier

Snap SocketSnap Socket, Anti-Static, Push & Clinch

Masking TapeMasking Tape

[View:/resized-image/__size/620x465/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-404657dd-7089-478b-b5fb-1ddfe3ba3975/5658.contentimage_5F00_207171.png:620:465]

Ferrite CoreFerrite Core

Enamelled Copper wireEnamelled Copper wire, 18 AWG

[View:/resized-image/__size/620x465/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-404657dd-7089-478b-b5fb-1ddfe3ba3975/4760.contentimage_5F00_207172.png:620:465]

JumpersJumpers for DIN mount connection blocks

FerrulesFerrules

[View:/resized-image/__size/620x465/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-404657dd-7089-478b-b5fb-1ddfe3ba3975/2548.contentimage_5F00_207173.png:620:465]

There were a few items in backorder: BF256BBF256B JFET and an Earth bonding plugEarth bonding plug.

RE: A Crystal Clock with 1 Transistor - the Pierce Oscillator

kmikemoo — Wed, 03 Feb 2021 04:12:04 GMT

[mention:acaf6a9338de4eef8f6717d5561ed01d:e9ed411860ed4f2ba0265705b8793d05] I finally made time tonight to breadboard this circuit. 2N5457 JFET, 10uH inductor, 10nF capacitor, 7.023 MHz crystal. 7.018 MHz output. 2.8VDC in. 2v p-p out. OLD coin cell batteries so they drained down quick.

VERY COOL circuit. Thanks for sharing.

RE: A Crystal Clock with 1 Transistor - the Pierce Oscillator

mudz — Tue, 26 Jan 2021 19:08:48 GMT

Wohoo, that's a lot of work for a sweet little one-transistor crystal oscillator.. [View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-404657dd-7089-478b-b5fb-1ddfe3ba3975/contentimage_5F00_938.png:16:16]

Interesting Project, nice work [mention:acaf6a9338de4eef8f6717d5561ed01d:e9ed411860ed4f2ba0265705b8793d05] !

RE: (Modified) Work Clock

Fred27 — Wed, 20 Jan 2021 09:33:17 GMT

Another project which comes to mind is the various versions of Lord Vetinari's Clock which people have made.

Lord Vetinari also has a strange clock in his waiting-room. While it does keep completely accurate time overall, it sometimes ticks and tocks out of sync (example: "tick, tock ... ticktocktick, tock ...") and occasionally misses a tick or tock altogether, which has the net effect of turning one's brain "into a sort of porridge".

RE: (Modified) Work Clock

hugohu — Wed, 20 Jan 2021 04:13:58 GMT

How could I miss this?

Great project. Like fred said I was also wondering how you could alter time.

Great job!

RE: Cat Commander iot Clock and Kibble Dispenser

hugohu — Tue, 19 Jan 2021 23:35:34 GMT

Great blog!

RE: Laser Shutter Tester

sokol07 — Tue, 19 Jan 2021 13:02:19 GMT

Again, thank you for you work and your feedback!

I saved your measurements and the suggested system. At the moment I have a bunch of stuff to do for my work and some urgent 3d printing for myself (tinkering in a little apartment sucks - i have space for only one project on the table...) but I hope i will be able to update the LST using your comments soon.

RE: The Current Time : Hours and Deciminutes

navadeepganeshu — Mon, 18 Jan 2021 15:18:54 GMT

Wow! Loved the idea and build.

Matching matching with 4.7 [View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-99281e85-891f-4d56-8efa-d3650d335355/contentimage_5F00_1.png:16:16] . I just realised that Arduino nano gives only 4.7V though its marked as 5V. Couldn't that drop be compensated with diode compensation circuit easily?

Good that it helped in this project as 5K resistors aren't common to get 10mA for the clock, yet seems so wrong to have marked 5V output onboard though it never supplies it.

RE: NeRDPACk - No RTC DigitPad Alarm Clock

dubbie — Mon, 18 Jan 2021 13:17:20 GMT

Looks like a nice clock system. I like the keypad, it looks nice. I have never used a keypad on any of my projects so I might have to look ing=to something like this, just to expand my knowledge. I didn't know that some Arduino came with crystals either, although I do not have any Pro Minis so that might have something to do with it.

Dubbie

RE: SunPathClock

dubbie — Mon, 18 Jan 2021 13:10:32 GMT

Bernhard,

This is an interesting project. I like the idea of using the GPS module to get the position of the sun. With a bigger display you could make some sort of daylight lighting system, or even a picture of some outside place, where the sun gradually moves around in the picture as the day progresses.

Dubbie

RE: Laser Shutter Tester

jc2048 — Sun, 17 Jan 2021 23:12:43 GMT

Nice project. I feel like I want to build one.

I don't have any TEPT5600 parts but I have some TEPT5700 [wider

viewing angle] so I thought I'd try them to at least get a rough idea

of what the speed was like [they don't necessarily have similar

characteristics, but it's possible they're the same die in different

packages].

This is with a 18k pull-up resistor to 5V. The light source is a

switched LED, positioned right in front of the sensor. The LED

switches fast enough that, on this scale, you can assume the light

intensity steps instantly at the trigger point (the 'T' marker at the

top of the screen). The timebase is 200us per division.

[View:/resized-image/__size/480x234/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-4501d8c1-f442-45c1-94b3-06988c144247/contentimage_5F00_193527.png:480:234]

[View:/resized-image/__size/480x234/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-4501d8c1-f442-45c1-94b3-06988c144247/contentimage_5F00_193528.png:480:234]

The output speed varies quite a bit with different values of resistor.

This was the value I needed to get the collector voltage right down

near zero when the LED is on.

It's not particularly fast, but then it doesn't need to be for the normal

intended applications. In your case, the two delays tend to counter

each other, at least to some extent. For this sensor, it looks like it

would be better with a TTL threshold than a CMOS one.

RE: The Current Time : Hours and Deciminutes

shabaz — Sun, 17 Jan 2021 14:39:12 GMT

Hi Dubbie,

If the Arduino functions expose PWM easily (I think they do, but I've just not done it), that could be another approach (i.e. change the duty cycle, so that the average voltage varies). Anyway, as usual, there's many ways to tackle an idea!

Just to throw another idea out there for discussion, in the past there also used to be analogue meters with two needles, they used them for ham radio SWR meters.. I wish these meters would make a comeback for representing two pieces of data.

(Image source: aliexpress).

[View:/resized-image/__size/423x363/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-99281e85-891f-4d56-8efa-d3650d335355/contentimage_5F00_193667.png:423:363]

RE: The Current Time : Hours and Deciminutes

Fred27 — Sun, 17 Jan 2021 12:11:13 GMT

Needs more robots. [View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-99281e85-891f-4d56-8efa-d3650d335355/contentimage_5F00_3.png:16:16] [View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-99281e85-891f-4d56-8efa-d3650d335355/contentimage_5F00_938.png:16:16]

RE: Spectrum Clock

Fred27 — Sun, 17 Jan 2021 12:09:21 GMT

What do the two outer rings do?