LeoNerd's Store

513 orders since Mar 31, 2015

Twickenham, England, United Kingdom

Ships from United Kingdom.

Custom Work Available

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Still active despite the COVID-19 situation; though shipping times will be slightly slower at the moment.

Overall Rating:

Review Breakdown

Average Ratings

Product: (4.94)

Documentation: (4.40)

Shipping: (4.94)

Communication: (4.94)

All Reviews

S A | Aug. 28, 2024

OScope Current Probe is awesome

For Oscilloscope Current Probe Adapter

If you ever looked at oscilloscope current probes, you know how expensive they can be. I am just a hobbyist and wanted something to do the job, without being cheap an inaccurate. This device fits the bill, and is well worth it to me. My first experiments (varying input over 6 - 9V to generate between 500ma and 250ma matched the scope very closely (all data points varied only a fraction of 1% close to agreement from my other measurements).

note: I am not an EE, just a electronics hobbyist, and a happy customer.

Jing | April 1, 2024

Excellency to customer's satisfactory

For ATtiny3227 Development Board

My 1st shipment was trashed by shipping company. The seller sent me a 2nd package without additional charge. Bravo to the seller.

Jing | April 1, 2024

excellent customer service by the seller

For AVR UPDI Programmer with 12V

My 1st shipment was trashed by shipping company. The seller sent me the 2nd shipment without any additional charge. Bravo to the seller.

Zoltan | March 15, 2024

High-quality and very useful little device!

For 8 Channel Signal Monitor

I used this board on my hybrid serial computer project to visualize some signals and it worked great. My only possible improvement feedback would be to have versions with different pinouts to be directly pluggable into some ports (for example PMOD) etc. for even more versatile use.

Alwyn | July 14, 2022

Works as described!

For RS485 Isolator

Bought a couple of these as DMX transceivers, and they work very nicely! Highly recommended! Just some feedback if a new revision is being considered: It would be nice to be able to control the receiver rather than having it continuously available through tying /RE line to ground by design. Perhaps add a couple of solder pads so that the user can decide to either tie /RE to ground or tie /RE to DE (making it always one or the other), or bring the control to a separate terminal on P1. In addition, it would be useful to bring out the Y and Z pins to P2 separately too, with perhaps solder pads to put them in parallel with A and B should the user want that. Just some thoughts on an otherwise excellent product!

Response from LeoNerd's Store | July 15, 2022

Ah yes - some good ideas there. Perhaps I'll bring them out on solder pads rather than through-holes, in order to keep the same footprint. By default wired up through to where they go now, but if people want to do something else with them, just break a jumper and solder something else to the pad.

Bjorn | June 29, 2022

Super helpful!

For ATtiny1616 Development Board

This was really helpful for getting an attend project I was working on prototyped. Everything is clearly labeled so no documentation was needed. I came back and ordered more!

Andy | May 7, 2022

Fantastic - easy to use

For 8 Channel Signal Monitor

WOw, what an amazing little device. I use it to monitor signals on my RC2014. Great quality item!

Tom | June 1, 2021

Very nice little signal monitor

For 8 Channel Signal Monitor

This is a really nice little device. I like visual diagnostics when I am prototyping and this little signal monitor is a much neater solution than shoving a bunch of LEDs into the breadboard. I like that it can give analog signal feedback, too. I would love to see a version of this with 90 degree angle headers too for easIer readability

P | April 17, 2021

Great programmer for UPDI devices

For AVR UPDI Programmer with 12V

This programmer has been very reliable. I use this now instead of the jtag2updi I built.
The 2nd serial port is unique to all the other programmers I found, makes printf debugging very easy. I jumped J2 pin 3 (NC) to RXD2 so I can have a single cable to my target.
I haven't tried the HV function (allows use the UPDI pin as GPIO), but it's good to know its available.
The HV switch is not labeled on PCB, although LED (+12V kick) will indicate HV option device is powered up.
Not sure how to install Device::AVR::UPDI (having a quick write-up on how to use this would be nice), so I use PYUPDI, which works well.
My PCB has a 4.7k resistor pre-installed, so it needs to be shorted to work with this programmer. Another nice-to-have would be to bypass the onboard 4.7k easily to work with boards that have it installed.

Seon | April 1, 2021

Great little programmer

For AVR UPDI Programmer with 12V

I bought this because of the CP2105 and being able to view Serial output on the second UART2USB while flashing on the first one. This alone has saved me countless hours of switching ports or cables or simply not being able to get serial output at all. Thanks for making it!

Dan | March 16, 2021

Nice little breakout

For AVR UPDI Programmer with 12V

Got this to play with some of the 0- and 1- series UPDI chips, and along with pyupdi is a great little tool for poking around with these chips and not having to break the bank on one of the big debuggers.

The secondary uart interface is a nice feature too (that I haven't used yet), but I think it'll prove useful to have on hand as opposed to needing a spare ftdi or whatever breakout.

Uno | Feb. 12, 2021

I got what i expected.

For ATmega4809 Development Board

I expected good, simple, easy understendable devBoard. Thank you!!!
I definitely recomed buy from LeoNerd!!!!

William | Feb. 2, 2021

Great combination of input devices and readout OLED

For OLED Front Panel Module

To me, the next hardest part of a project (after getting it working) is to get installed in some type acceptable looking project box. This module allows you to mount all the operator input buttons and rotary encoder and 1.3" OLED easily. It also has a lighted(Red/Green) pushbutton/piezo buzzer. All these devices are communicated to via an I2C interface thus freeing up lots of GPIO pins for other uses.

The best part for me (Beginner) is a Arduino usable library that takes all the hard work out of using all the onboard devices. The library was written by a user and has been very helpful in attaching to all the included inputs/outputs.

To top if off, he provided a link for a 3D printed case for the module.

My only problem with the library provided is the parameters for the demo on the piezo buzzer are incorrect. I had to look at some other code for the piezo buzzer and modify the example to get this part of the demo working. Even with my modifications the volume on the buzzer is very low.

All in all, a GREAT find and the price very reasonable for all the pieces and functionality provided..

Justin | Nov. 24, 2020

Great programmer for tinyAVR 1-series

For AVR UPDI Programmer with 12V

I got this board to program and debug tinyAVR 1-series parts, and it's working well. I'm using pyupdi on a macOS host for programming, with the driver from here: https://www.silabs.com/developers/usb-to-uart-bridge-vcp-drivers. I had trouble initially because the target board I was trying to program included the 4.7k resistor on the UPDI line, but once I bridged that programming was successful. Having the schematics of the programmer available was useful.

Technik | Oct. 15, 2020

A great little module for the DIYers!

For OLED Front Panel Module

I found this module by browsing through the Tindie website.

Since I had the demand for something "out-of-the-box" that integrates an OLED display, an encoder one push button and a buzzer on one single PCB for the SMuFF project (https://sites.google.com/view/the-smuff/), I was happy to find this nifty little thing.

Paul, the designer of this module, was very courteous with regard to various (software) extensions I needed (i.e. playing tunes over the buzzer). A couple of e-mails later I got exactly what I wanted.

I'm very convinced, that this module takes away the pain from inventing and building something yourself when you need a decent way for inputting / outputting data on your MCU. Hence, I've published an Arduino framework library on Github, which makes adding the OLED module to your next project a breeze.
Head over to https://github.com/technik-gegg/LeoNerd-OLED-Module-Library for more details. A basic example is included in the source code in order to show you how to get this all flying.

I've also designed an enclosure, for those of you who own a 3D printer and would like to make a decent housing. Within the files you'll also find a template for the module, in case you need to build your own, customized enclosure.
The files are open source and can be found on Thingiverse (https://www.thingiverse.com/thing:4600068) and the GrabCad library (https://grabcad.com/library/leonerd-s-oled-module-1).

Don | Sept. 7, 2020

Could use a serial interface

For ATtiny3217 Development Board

I'm enjoying starting work with the ATtiny3217 development board. The current distraction is trying to get a 3v3 USB/FTDI module to work with it so I can use Serial Monitor for troubleshooting. The board would be considerably more useful to me if the aforementioned functionality was an option when buying the board.

Justin | Aug. 10, 2020

A lovely peice of kit - recommended

For 8 Channel Signal Monitor

I finally had the need to use this device to debug a stripboard mounted system -- and it helped me locate an address line being pulled low due to a track-cut that had the tinyest slither of copper still bridging it.

I liked how the device showed floating inputs, and the surprise feature of a voltmeter.

I wish it had 32 channels, instead of 8, but that's like asking for a moon on a stick (and probably add a lot to the reasonable cost - and if I really needed that feature, I would order three more)!

The documentation could be a little better (such as explaining each menu item), but after some button pressing, it soon became apparent how to use the different modes.

Niel | April 28, 2020

Excellent build quality

For ATtiny412 Development Board

Tested this board only with a 'blink' application so far. It works as expected, and a note is to the build quality, it is excellent. Good markings on the PCB is present for the GPIO pins and progranmming header is standard UPDI.
Also, Leonerd is very reponsive to questions.

Niel | April 10, 2020

Very usefull

For AVR UPDI Programmer with 12V

I have tested device with two attiny412 boards, also from Leonerd.
It is easy to use, and allthough there is no documentation, the board is clearly marked on PCB for all connections.
The 12V (for high-voltage fuse programming) works out-of-the box, and no further is needed, except by setting the switch (also labeled on PCB for 12V programming). I experienced issues programming the fuses during initial testing, which was due to high serial speed (better set the speed to 38400, and it works very reliable).
I want to mention another option for a programmer, besides the two options mentioned by Seller, which is faster than pyupdi, and have better logging/error output.
The below repository have binary releases for Windows, but it is easy to build on Linux, recently it was updated with a pull from me, which adds more known devices.
Link: https://github.com/Polarisru/updiprog

Paul | Jan. 27, 2020

This little gem is going into my favourite test tools box!

For 8 Channel Signal Monitor

The 8-channel signal monitor is a fantastic replacement for multiple LED-resistor pairs and also fills in where I don't want to pull out a my logic analyzer. The display is clear and setting up couldn't be easier. This tool is literally plug-and-play. HIGH RECOMMENDED!

Ketil | Nov. 27, 2019

So happy this is a thing

For AVR UPDI Programmer with 12V

I love being able to continue pursuit of tinkering with new attinys since starting out with small pic and avr chips. This programmer eases the step into surface mount and the updi-interface of newer mcus like the attiny 0/1 for compact and power starved projects. The second uart seems like an afterthought, until you realize this is a huge asset - all communication with your tiny project handled by one gadget - great!
I never found a single document or web page documenting the programmer entirely, but there are schematics and other hints to lead you along. The 6-pin connector is the updi, with vdd, vss and updi, the flat connector at the end is the second uart. Not sure what polarity the 12V switch is yet - either way works until you fuse the attiny pin away from updi, afterwords you can just try both positions, I guess. The "first" uart is updi (on my linux box), the second one is the second uart on the board.

Response from LeoNerd's Store | Dec. 10, 2020

In response to the confusion about the switch, I have added a yellow LED indicating whether the 12V pulse mode is active

Ashar | March 22, 2019

Very good Experience

For ATmega328PB Development Board

Perfect proto-board we needed.
The shipping was very fast and everything was delivered.
The seller communicated quickly and was very helpful

Robert | Sept. 27, 2018

A well thought out product with a terrific seller!

For OLED-1106 Front Panel Module

Honestly, I still have a lot to learn about this, but the product seems very well built and Paul has been tremendously helpful. I had searched high and low for something like this, and I think it's an outstanding value for the cost. Worth trying for sure. Thanks, Paul!

Henning | April 25, 2018

Beautifully simple and clean layout - works well

For ATmega328PB Development Board

Purchased two each of 16 MHz and 20 MHz versions, and wondered if I would have to use ICSP for programming the fast one - but that wasn't necessary.
I found a description somewhere else about installation into the Arduino IDE; you will have to enter the URL of a json file - then it goes automatically. (Go to menu File / Preferences and enter the address in the field Additional Boards Manager URLs). I then had to fiddle with the baud rate setting in the file boards.txt - it was the variable atmega328pbcc.upload.speed that had a wrong value. (Perhaps something you could clear up and put somewhere on the web page, Paul? - or have I overlooked something?)
It is great to have access to three 16 bit counters in this small package! A 20 MHz clock gives a nice round period of 50 ns which simplifies some scenario. On the other hand: I moved a project from an ATmega2560 to one of these boards with the code hand-tuned for a 16 MHz clock - its not so simple that faster is better!
I prefer the clean port numbering scheme over the Arduino pin numbers - but it is handy to have both in a spreadsheet file when you allocate pins and resources for your project; many libraries refer to Arduino pin numbers.
These boards are very much recommended.

Bob | Feb. 19, 2018

Faster than an uno

For ATmega328PB Development Board

Request for 20MHz option vs 16MHz was created in a day or two. Try that with a big company. Mega328PB has 2 uarts... Paul has the head start on a next gen UnoPB already. Super.

Josh | Aug. 5, 2017

A better version of an awesome product.

For Oscilloscope Current Probe Plus

I have an older version of the original current probe, and it has served me well; with a few hacks to it; it's been one of those tools I keep close at hand. So when I saw he came out with a new updated version, I just wanted to support him. This version is awesome, but may not be for everyone. The ease of use and the improved range is really nice when you're not just dealing with USB-powered projects.
The BNC cables & hook power cable is a nice addition, they are well made.
Leonerd is great at helping you get going, and answering questions.

Josh | Aug. 5, 2017

How did I not know I needed this?

For 4-way Identifying Continuity Tester

This is a brilliant, simple design to fill a niche testing that I had no idea I needed until I read about it. Leonerd is a great maker (I love his current probe for oscilloscope) and this is just a nifty testing tool.
It hit me in the middle of the night how much use I would get from this, and my 1st use I was not let down. It is a great testing tool. Overkill if you only test one bit for continuity at once, but if you can think along multiple paths, you can test multiple paths.
The indicator is efficient, and ability to use a normal probe and/or hooks is really nifty.
very cool. You need this, you just don't realize it yet.
(btw: Shipping to USA was fast & well packaged)

Update: I accidentally put the box on my hot plate and left the room... came back to a smell and melted box. Luckily I had a box about the same size. The reason I set it down is that I was moving wires around on my workspace. Since I was going to stick in a new box, I thought I might as well have an option to use it without a battery -- I had a lipo charger module, a tiny 5v boost regulator, and a small lipo battery -- Unfortunately for me, the box was smaller making it a challenge to fit everything; The original box had more than ample room (in case anyone else has the same idea).

It seems like I use this every day. Just a great, brilliant, simple little tool, and well built.

Response from LeoNerd's Store | Aug. 7, 2017

Hi, thanks for the great review.

In terms of "thinking along multiple paths", I usually like to use this for testing PCBs fresh from the fab. I connect the red and green clips to VCC and GND, because often those are filled planes on one layer of the board. The flying probe can then check connectivity to all the footprint pads along with the yellow probe, while at the same time checking for bridges between traces that ought to be isolated, and one of those planes. Occasionally I've picked up board errors due to that.

Josh | Aug. 5, 2017

Nicely made cables!

For Twin BNC RG174 Patch

These are nicely made a nice length -- perfect for working on the bench & a scope on a shelf (I got the pair with 90 degree ends on both ends)
Goes great with either of his oscilloscope current probes.

Josh | Aug. 5, 2017

Nice cables, not just for power...

For "Lock Hook" Power Cable

I ordered this to go with the oscilloscope current probe plus. These work great, and are well built.
I wish I had ordered a couple more, they would be useful for more than just powering the current probe!

Michael | Aug. 2, 2017

Very nice product

For "Lock Hook" Power Cable

This is a very practical cable because it is not as bulky as many other cables and easily fits into PCB holes

P | May 27, 2017

F#$king Amazing!!

For 4-way Identifying Continuity Tester

Bought this on a whim and it's turned out to be one of my favorite tools.
It makes troubleshooting boards a dream.

I just wish I had this on my bench 10 years ago.

Alex | Jan. 1, 2017

Excellent piece of gear, great price

For Oscilloscope Current Probe Adapter

The Oscilloscope current probe adapter is an excellent accessory to go with any oscilloscope, the type of connections onboard are perfect and it seems to be extremely responsive. The only 2 things that would be good to change would be optional simple acrylic case similar to those available for the bus pirate. The other would be an onboard boost converter so that it didn't a separate power source for current measurements above the input voltage, although i understand this would add much complexity and cost.

Martin | March 15, 2016

Nice product, works as advertised!

For ATtiny 14pin SOIC-to-PDIP adapter

We are using this for a RS485 adapter prototype using an ATTiny841, to make programming and all easier.

Josh | Jan. 21, 2016

Great adapter board for reading current

For Oscilloscope Current Probe Adapter

It's not as robust as I would like (I would like to read 3.3v up to 500ma) but it is near perfect for hobby-users. I use it for checking low-power gizmos that I run on batteries where run time is critical -- squeezing every little ma out key, and this makes it easy to visually see what changes result in what...
I didn't have any bnc cables around, so I had to solder on a (standard) header pin (not included) so I could attach my scope probes. The board is well labeled & built. The only thing I would suggest is read the description carefully and understand the limits. Works great for what it is intended for!

---- Edit 26 April 2016
Having used it for a while now, I love it even more. I ended up putting it in a small box as it could get odd readings if I touched it; or it grounded to something else. (duct tape worked great until I happened upon a perfect box). I recently built a few "uCurrent" boards & compared it this; readings were very close. In fact, this fluctuated (accurately) more than the uCurrent; this is good when viewing on an oscilloscope as you get a better feel for leds flashing, or more loss -- the uCurrent seems to buffer the flutters.
You really can't go wrong for this price!

Response from LeoNerd's Store | Jan. 21, 2016

Low-power battery projects are indeed what I built it for - glad you found it useful there :)

The space reserved for the 3pin header is useful for attaching non-BNC connectors, indeed. I decided not to populate it because people might prefer header or socket on there, so this gives them the choice - the intended users for this kind of equipment should be able to easily handle fitting that themselves.

As to the current-reading limit of 100mA per volt of supply, you have found that you can't read up to 500mA when supplied at only 3.3V. It was a trade-off in design, between requiring a separate external power supply, or tapping off the same supply that powers the load. I opted for the latter as it makes for an easier setup, and should still be within the limits of what most designs require. If I did a redesign for a newer version, perhaps that's something I could look into - maybe a 3pin header you can switch with a jumper, to either tap off the supply as it does now, or use a separate supply input for the current amp. In such a setup you'd be able to supply 5V there to give it the 500mA measurement ability, but still supply 3.3V to your load.

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