Petr Dvorak

The first version of this device was designed in my KiCad live stream.

New:

All comparators have hysteresis.

When the current is over 1 mA, the Red LED blinks. When the current is in the band, the Red LED is always on.

When the current isn't going through it, the Green LED is constantly on.

The SN74LVCH8T245 is an 8-bit noninverting bus transceiver
The A port is designed to track VCCA, , 1.65 V to 5.5 V.
The B port is designed to track VCCB, 1.65 V to 5.5 V. This allows for universal low-voltage bidirectional translation between any of the 1.8-V, 2.5-V, 3.3-V, and 5.5-V voltage nodes.

Tin balls on the WLCSP packages are troublemakers.

The Pb-free balls don't always go along with SnPb solder paste.

I had to reflow the package three times until I found a way to win the game.

The greyish Pb-free solder balls are vile.

The lesson was learned and let's go further.

GitHub - hwidvorakinfo/Smart_agricultural_switch at master CELUS+Blues example design of a Smart Agricultural switch - GitHub - hwidvorakinfo/Smart_agricultural_switch at master

Could you read with me: Smart Agriculture Switch, Example design?

OK, that's the way I wrote it.

Regarding the design. It's my latest contribution to the CELUS Design Platform + Blues company cooperation.

github.com/hwidvorakinf...

OpAmp can be rail-to-rail at zero output current ONLY!

Surprised?

You can't outrun resistance.

• When using a rail-to-rail OpAmp, be aware of the output load.
• 10 kΩ is ok.
• 100 kΩ is better.
• 1 kΩ is too low.
• Always check the datasheet and look for "swing" or "dropout".

Unlike other joysticks, this one allows for twisting, supporting the AH4930Q sensor.

To bring this vision to life:

1️⃣ Captured the schematic
2️⃣ Layed out the PCB #KiCad

@aisler.net generously supported my design. The craftsmanship and EU quality are exceptional.

Thank you for your support!

YouTube video by Petr Dvořák AH4930Q. I created a magnetic joystick based on a 3D Hall sensor.

How the AH4930Q 3D Hall-effect sensor from Diodes Incorporated works in practice.

More about the AD4930Q:
• 12‑bit resolution
• Built‑in temperature sensor for on‑chip temperature compensation
• Operates on 2.8–5.5 V, works from –40 °C to +125 °C
• 6‑pin SOT-26 package
• AEC‑Q100 Grade 1

Sketch first. Capture later.

Project sketches are also perfect for the project proposal documents.

Whenever I prepare a project quotation, I create a dedicated document where:

> All requirements are listed
> Project is broken into subparts with timing
> Key features of the project are mentioned

I have a habit of customising component symbols.
The already-used format/shape is my target.

Whenever I am working on a new schematic symbol:

> Inputs on the left
> Outputs on the right
> Power entries on top
> Grounds on bottom

Today, this unboxing video makes me happy.

The Arduino Nano R4.

The piece of hardware inside is a well-crafted device.

I discussed the features of the new Renesas RA4M1 MCU many times.

I am now extremely happy to offer the well-supported Nano R4 platform for my customer projects.

The Agriculture IO board design series is out

I’m grateful for the generous support from @aisler.net, whose 4-layer Beautiful Boards

Back to the PCB. As always, the boards arrived quickly and were of top-notch quality

The craftsmanship speaks for itself. The EU quality

Thank You for the Support!

YouTube video by Petr Dvořák 𝗠𝗮𝗸𝗶𝗻𝗴 𝗶𝘁 𝗿𝗲𝗮𝗹. 𝗖𝗼𝗻𝗻𝗲𝗰𝘁𝗶𝗻𝗴 𝘁𝗼 𝘁𝗵𝗲 𝗰𝗹𝗼𝘂𝗱.

𝗠𝗮𝗸𝗶𝗻𝗴 𝗶𝘁 𝗿𝗲𝗮𝗹. 𝗖𝗼𝗻𝗻𝗲𝗰𝘁𝗶𝗻𝗴 𝘁𝗼 𝘁𝗵𝗲 𝗰𝗹𝗼𝘂𝗱.

I’ll bring my Arduino Smart IO board to life.

Want to create a cloud-connected board? Check out this video on how to do it with CELUS Design Platform and Blues Notecard. It’s a great resource for beginners.

Enjoy my latest demo. 1x AAA cell. 1x boost converter. 8x white LEDs.

Much fun.

Whenever I combine electronics with a mechanical part,

I am happy because I feel like a genuine engineer.

Well, I believe I am even without the 3d-printed gadgets but still. To combine multiple areas where I can be creative, it multiplies the effect.

Follow for more.

The 3D-printed mockup PCB helps me verify areas where I am short of skills.

Every time I print a PCB mockup or a gadget that improves my HW design workflow, I am super happy.

Hands down, the 3D printer is the second-best tool for HW designers next to the soldering iron.

Original Prusa i3 Mk3.

I'm halfway through. Not there yet. It'll take a while.

Well... It'll take a few days until I'm done.

This project brings a unique challenge. No high-speed stuff. Not impedance matching or RF magic.

All signals from the top go to the bottom...twisted.

YouTube video by Petr Dvořák 𝗗𝗲𝘀𝗶𝗴𝗻𝗶𝗻𝗴 𝘀𝗺𝗮𝗿𝘁𝗲𝗿. 𝗖𝗼𝗻𝗻𝗲𝗰𝘁𝗶𝗻𝗴 𝗳𝗮𝘀𝘁𝗲𝗿.

𝗗𝗲𝘀𝗶𝗴𝗻𝗶𝗻𝗴 𝘀𝗺𝗮𝗿𝘁𝗲𝗿. 𝗖𝗼𝗻𝗻𝗲𝗰𝘁𝗶𝗻𝗴 𝗳𝗮𝘀𝘁𝗲𝗿.

I designed a custom Agriculture Smart IO board using three tools that helped me skip the usual blank canvas feeling:

• CELUS Design Platform.
• Blues Notecards.
• KiCad.

Have you ever used 𝗔𝗜 in your hardware design?

555 timer simplified

Microchip Technology Inc. MIC1551 and MIC1553 IttyBitty® RC 555-Type Timers / Oscillators are ultra-small, high-performance timing solutions designed for space-constrained applications.

+2.7V to +18V operation.

50% square wave with one resistor and one capacitor.

SOT-23-5.

New design needs new PCBs. New PCBs need prints.

I started from my Hardware Design Template for BC53.6 DIN-rail enclosure. If you want to know more, tell me in the comments, please.

• A 5-minute job in KiCad.
• A 1-minute job in Prusa Slicer.
• A 31-minute job for my Original Prusa i3 Mk3.

Do you know what I love about Chinese designs?

They replicate and reuse.

That's the starting path to effectiveness. Start from the working solution. Improve it. Make it better.

Don't be a hero.
You don't always need to start from zero.

Do you replicate or always innovate?

Cats destroyed my soldering iron. When I got back home,

the iron was in pieces. Luckily, I am a prepper...

A few years ago, I bought two generic Hakko soldering iron handles. Just the hand part with a cable at the end.

I repaired the iron and I am happy now that it happened.

Thanks, cats.

We all know load switches. We all know ideal diodes.

The Analog Devices LT4423 is a 1.9V–28V ideal diode and load switch with fast, efficient power path control.

> Schottky Diode Replacement
> Battery and Wall Adapter Diode ORing
> Backup Battery Diode ORing
> Industrial and Consumer Applications

Here is the key to the key question of M.2 connectors.

It opened a new world to me.

I was unaware of the key positions of the M.2 connector and its designed meaning. Frankly, I thought there was only one M.2 connector that is designed to cover all interfaces:

> PCI Express
> USB
> SMbus/I2
> ...

This video contains a rare occurrence of hashtag#ThatKiCadGuy

I took the video at the beginning of the manufacturing day. You can see a stencil there and a prototype board that will be given a sister of the 1st revision origin.

I enjoyed every second of the Rev 2.9 – Adrian Leal.

I always plan my daily schedule into blocks.

Right now, I am in the middle of the mfg block.

The first prototype version's performance equals the second version, which is unsatisfactory.

It doesn't mean the second version is useless. It serves as a confirmation that this way isn't correct.

My newest demo with AD5160. The oscillator controlled by the digital potentiometer!

The digital potentiometer replaced one of the resistors in the 555 oscillator circuit, thereby directly controlling the period.

I’m grateful for the generous support from @aisler.net, whose 2-layer Beautiful Boards

YouTube video by Petr Dvořák AD5160. The Digital Potentiometer demo can be fun.

The Digital Potentiometer demo can be fun.

I made it fun by replacing one of the resistors of the 555.

A DigiPOT, the Analog Devices AD5160, is used to control a 555 oscillator. The AD5160’s SPI control allows for easy adjustment of the oscillator’s period by changing the resistance value.

I want your honest feedback. This is important to me.

This is the most crucial post in a long time.

I want your honest feedback. This is what I want to ask you for.

If I had to improve just one thing about my activity on LinkedIn right now, what would it be?

I overcomplicated Blinky to make this demo FUN

And I succeeded. It's a good one

In a few days, the demo eval board will be presented as the EASY video post
So today, only briefly about this project

>Digital potentiometer AD5160
>555 timer used as an oscillator
>MCU supervising this super-machine

I recently made this error with a D-type flip-flop.

To mix things up, there is SN74HCT74 that uses PRE and /CLR and CD74HCT74 with /PRE and /CLR which mirrors the SN74HC74.

Ough, it needs a table

• CD4013B SET RESET
• SN74HC74 /PRE /CLR
• SN74HCT74 PRE /CLR
• CD74HCT74 /PRE /CLR

Can you see it?