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!

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 :)

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.

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.

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!

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.

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.

Tindie

jdn

Overall Rating:

Review Breakdown

Average Ratings

All Reviews

The product arrived, and I am very satisfied!

Nice stuff!

Great product

Multimode debugging display is versatile

Delightful! Portable, compact LiPo

Low cost, low impact, and high value

Two OLEDs with nice code

Very useful and practical tool

LearnCbot

Indispensable for debugging!

Great little turtle bot!

Great tool for debugging.

Nice easy debug tool.

Great little logic probe