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jdn

213 orders since Oct 30, 2015

Belmont-sur-Lausanne, VD, Switzerland

Ships from Switzerland.

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Swiss design - small is beautifull

Overall Rating:

Review Breakdown

5
14 4
7 3
2 2
0 1
1

Average Ratings

Product: (4.79)

Documentation: (4.29)

Shipping: (4.50)

Communication: (4.62)

All Reviews

John | Dec. 24, 2022

The product arrived, and I am very satisfied!

For TIL311 Hex Display - set of 4

Due to my own mistake, the first attempt to deliver the package failed, I had provided an incorrect address.
When the item returned to the sender, he contacted me and we worked out the details so that I could receive the product.
The items arrived safely and are exactly as described, and I’m looking forward to using them in a project!
I would like to thank Jean for offering these items for sale, and for acting quickly when he realized there was an issue!

Dylan | July 19, 2022

A great product, terrible packaging

For TIL311 Hex Display - set of 4

The displays were as described and all appear to work well. Unfortunately the packaging was terrible, very thin foam around the pins and display in a regular envelope. The result was all the displays had bent pins, some quite badly bent. Fortunately the pins are quite forgiving and I was able to straighten them without breaking any. In future can I suggest you use more robust packaging as the postal service is far from gentle.

Guus | Oct. 3, 2021

Very nice displays, look ok.

For TIL311 Hex Display - set of 4

Products ok.
Fast shipment, all in all a good experience.
Can recommend this seller.
Hope his stock does last a long time.

Marton | June 18, 2021

Nice stuff!

For Logic Pen Kit

Arrived very quickly. Easy to assemble (a few small inconsistencies in the instructions but you can figure out) and works well. Can recommend it :)

João Pedro | Feb. 15, 2021

Good simple logic probe

For Logic Pen Kit

A simple to build and cheap logic probe. The stencil on the board is easy to read and the whole thing is simple to solder. The only issue I found was that the Green LED (constant current) lights very very dim (I suppose that it is a problem with the resistor that limits the LED current). The only enhancement I could imagine was a simple buzzer to complement the LEDs functionality. Overall I recommend this product and the seller (which resolved a problem with delivery of the package swiftly).

Reza | Dec. 23, 2020

Great product

For Logic Pen Kit

Much more convenient than other methods to quickly verify circuit operation. Highly recommended. I swapped red and green led and the associated current limiting resistors. This made more sense to me, red is high, green is low.

Laurentiu | Dec. 10, 2020

Super useful tool

For Logic Pen Kit

Thank you for the postcard, it is beautiful! It took some time to arrive in Canada, but it's not the seller's fault and it worths the wait. I assembled it in no time, checking all the parts on my testers; all were good. Got a bit of trouble realigning the IC's pins and I managed not to break any of them. Because I intend to use the probe for old 8-bit computers with LS chips, I was a bit in doubt if the HCs will match the logic levels, therefore I installed the chips on sockets to be able to replace them with LS or HCT. The finished board is installed in an Epipen case which is perfect for the purpose. I can easily take it out by removing a screw.
Overall I'm very satisfied with the probe and I'm sure it'll help me in my troubleshooting. I would have a piece of advice for the seller about his future shipping: attach the chips directly on the PCB in their normal position and bend only two pins to keep them in place. The foam can be stuck under the PCB and fastened with a rubber tie. In this way, you can avoid the chips' pins being damaged on the way to the customer.
Highly recommended!

Donald | Dec. 7, 2019

Multimode debugging display is versatile

For DgTelli2c - Multimodes - hex - dec - alpha - seg

This I2C version of the DgTell display provides many additional modes for displaying debug information. Like the other DgTell displays, its nice and small. All modes are available via the I2C interface. Display of ASCII is even possible using clever use of the 7 segment digits. Very cool!

Donald | Dec. 7, 2019

Delightful! Portable, compact LiPo

For USB-Mini LiPo

This LiPo charger-booster easily connects to make your micro USB MCU board portable. There are many LiPo chargers and boosters and some charger/boosters, but this module is compact. The battery is no larger than the board. And, there's a power switch so you don't have to unplug the device.

Donald | Oct. 19, 2019

Low cost, low impact, and high value

For DiTell b - A low cost 4-digit debugging display

This tiny display provides a fast and easy way to prototype and debug a design with a small impact on the design.
The onboard PIC takes over function that would normally been coded in the user's flash space.

Donald | Oct. 19, 2019

Two OLEDs with nice code

For Get two Oleds – connect both on any Arduino pins

The OLED displays are quite common, but the libraries / code are great. Considering that the choice of a MCU over a CPU means that
Flash (ROM) and RAM are precious, this code is perfectly appropriate.

Jan | June 24, 2019

Very useful and practical tool

For Logic Pen Kit

The kit was shipped very promptly, and arrived as expected. The documentation didn't yield any surprises, and pointed out the tricky bits. Easy to solder (except perhaps the pointy point).

Functions as expected, reacts fast, and I really like that it also shows 'floating' state.

Wayne | Aug. 13, 2018

NOT GOOD, TERRIBLE

For Logic Pen Kit

The schematic, pictures,and instructions were all different from the actual PC board. Nothing agreed and didn't work. Big disappointment!
Avatar
Response from jdn | Aug. 15, 2018
Well, you did not get a bag that was corrected: yes, the indication for the led is wrong, sorry..
Beside this, the schmatic shows thes^hottky diodes in serie and this was replaced by one standard one. Anything else?
Cordially JDN

Henk | July 21, 2018

Worked directly from the box

For UART to USB OTG for your tablet or iPhone

I added the app "Stay Alive!" to keep the app "USB Terminal" visible. Works great!
There is nothing more to tell.

Txomin | June 26, 2018

LearnCbot

For LearnCbot – a shield to learn C

Very handy when you want to get a better understanding of AVR micros and you aren't too much into electronics. It has very basic and useful components like leds push buttons and a speaker already connected and ready to use.
Used it to test my Arduino programs while doing a MOOC and it helped me saved some time instead of having to do the circuitry on a breadboard.
So thanks!

Mike | April 12, 2018

Indispensable for debugging!

For DiTell b - A low cost 4-digit debugging display

This little debug board has been indispensable for debugging some systems for me that only have one pin left available. The code is so small and consumes very very little cpu cycles.

Gonzalo | Dec. 5, 2017

Great little turtle bot!

For Mini Turtle with LiPo

The bot looks incredibly cute, and it is super fast for its size. Docs are very clear and shipping was almost instantaneous :)
Keep up the great work!

Adrian | Nov. 15, 2017

Works fine, but silk screen and documentation not accurate

For Logic Pen Kit

Very quicke delivery. The documentation shows a version slightly different from the shipped kit. The kit's silk screen for the LEDs is misleading (but correct on the documentaton): Try an intuitive interpretation of the silk screen and the solder the LED just the other way round. The silk-screened 4K7 resistor has been supplied as a 10k, but this does not seem to impair the function. The suppplied cable is just a bit too short to be useful. After these initial obstcles the logic pen performs as expected.

Josh | Oct. 1, 2017

Great tool for debugging.

For DgTelli2c - Multimodes - hex - dec - alpha - seg

Great tool, works as described, amazingly low footprint (both physically and code size wise) Wish it had come with a grove wire connector, as I am not using it with grove products. Otherwise, works as described, support is good; well worth it. It does require some pre-planning on how you're going to use it get debug info, but it is worth the effort.

Daniel | April 6, 2017

Is exactly what it is intended to be

For Logic Pen Kit

The kit is mostly clear and easy to assemble. As another reviewer mentioned, the polarity of the LEDs could be clearer. There is a little note about how the silkscreen image has one side smaller than the other to indicate polarity. Changing that marking to stand out better would be nice. However, that pretty much is just a nitpick that stands out because the kit in general is super easy to build and well marked. I've never learned to read resistor color bands, and the instructions even went to the detail of listing out which color bands are for what resistor. Very well done!

I can think of various tweaks that would make it more useful such as being SMT or having a built-in battery but those would go against the point of an easy to assemble kit. It currently fits perfectly into being both a kit to build and a useful tool

I highly recommend this kit. I've often encountered cases where I needed to check a signal on an output pin that isn't connected to an LED. Before this kit it involved hooking up a multi-meter, scope or logic analyzer. None of these provide the nice simplicity of just a LED output. So I think this fits in quite well alongside my tools. The price is excellent too!

Daniel | April 6, 2017

Very fun little bot

For Mini Turtle with LiPo

There isn't a lot that can be said about the turtle bot that isn't obvious from the pictures and the video on the product description. If you are unsure, watch the video to see it dance. It is a little robot running on two motors with a battery on the back. It is remarkably fast and agile. I haven't tried the IR remote controls but the demo modes on startup have been fun.

I knew as soon as I saw the video I had to have one. It's just a really cool toy robot and I haven't seen anything similar before. It doesn't hurt that it is pretty cute too.

If only I could order a robot-army of turtle bots - muahahaha!!

Josh | Nov. 19, 2016

Nice easy debug tool.

For DiTell b - A low cost 4-digit debugging display

I didn't 'get it' at first, what good is showing 4 digits... but actually, you can cram a lot of info if you plan it well, about where you are, variable values, etc. The additional code (byte size wise) is small enough to leave in, which makes 'in the field' debugging a little easier, just attach it and you get your info.
This is my 2nd JDN product; they are great quality, but more important to a hobbyist is that he's there for you after the sale to help you if you have problems/questions.
Super fast delivery (to US, only took, what seems like, less than a week); well packaged. Very responsive to email queries.
If I had a complaint, (which I don't, as I gave 5 starts for documentation) is that the documentation seems to all be in PDF's; so translating from French to English is an additional step - - but he has a wealth of information available in the documents.
If you do bench top work; I think the lower cost (bigger display) is the way to go; but if you do field work, or think you might want to leave it connected for extended periods, I would get the smaller version, less to hang up on wires, fat fingers, etc).

Quality build, Great stuff & well worth the price.

Josh | Aug. 15, 2016

Great little logic probe

For Logic Pen Kit

This is a fast easy build and it works just as advertised. It's well designed, with a nice PCB and all parts needed. I used a little longer wires for the power. It has a nice breakout (3 male header pins) in case you want to use some other wire/probe.
the logic probe is small and easily fits in a shirt pocket, a bit of kit you can always have with you. The led's are bright and well placed.
Communication/support is awesome.

Well worth it.

John | July 13, 2016

Inexpensive kit that is fun to build and useful

For Logic Pen Kit

Great communication from seller when I placed my order. This is a fun and easy to build kit that is super useful for $9.

The led polarity on the pcb wasn't as clearly labeled as I would have liked but otherwise a quick & simple build. The IC pins were a little beat up from shipping but nothing too difficult to sort out.

Thanks!
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