Arduino UNO Clone for DIYers - Updated!!

RE: Arduino UNO Clone for DIYers - Updated!!

tronixstuff — Mon, 24 Jan 2022 22:37:49 GMT

Well done, always like to see how people make their own boards. I was looking at the data sheet for the CH330N you use in the R1 revision, you might want to take note of the following:

The figure below is the reference circuit for the MCU microcontroller to connect the CH330 chip through the TTL serial port to realize USB communication under the dual power supply mode. CH330 is powered by USB bus VBUS, MCU uses another power supply VDD, VDD supports 3V ~ 5V, diodes D6 and D7 in the figure are used to alleviate the problem of current inflow between CH330 and MCU through RXD or RX internal diode in dual power supply mode. The RX pin of the MCU in the figure should enable the internal pull-up resistor. If not, it is recommended to add a resistor of 8KΩ～30KΩ to the RX pin.

Diode D6 is for the case where CH330 has no power but MCU is powered and TX high level flows back current to CH330 through RXD internal diode; diode D7 is for the case where MCU has no power but CH330 is powered and TXD high level flows back current to MCU through RX internal diode situation. If it is determined that a certain situation will not occur, the corresponding diode can be removed. For example, if the MCU has a permanent self-supplied power supply, then D7 can be short-circuited.

The diodes are preferably low-power Schottky diodes, but ordinary diodes such as IN4148 can usually be used. In general, it is not recommended to separate power supply for CH330 and MCU, and use it only when necessary.

RE: Arduino UNO Clone for DIYers - Updated!!

andrewsays — Thu, 23 Dec 2021 04:38:46 GMT

Please also visit Arduino UNO Clone for diyers -2nd Episode for more interesting Arduino Clones.

RE: Arduino UNO Clone for DIYers - Updated!!

gentleman1408 — Sun, 03 Nov 2019 22:11:31 GMT

Hey,

that is a really nice projects. I will try to build some with my highschool students.

Unfortunetly the zip file for the R1 version is broken. Could you upload it again?

Would you mind sharing the schematic and board file for small adjustments?

David

RE: Arduino UNO Clone for DIYers - Updated!!

dubbie — Fri, 06 Sep 2019 14:17:16 GMT

I made (or had made) my own design for an Arduino, much simpler than tis one. I wanted something that we could give away at Open Days so it had to be as low cost as possible, yet it would still work with the Arduino IDE, be pin-thro-hole as my University could easily make this type of PCB, as well as being useful for students. I was surprised by how few components were needed. We bought the Atmel IC with the boot-loader already programmed in, added a capacitor (something to do with the IDE being able to communicate and/or reset the chip), a crystal, a couple of resistors I think, and that was it. We used a UB232R USB interface module to provide the serial comms to the IDE, as well as providing the 5V supply to run the IC, which was designed to be removed once a system was programmed. The UB232R was relatively expensive so we couldn't give those away.

It worked pretty well and I think we did give quite a few away. Later, we gave the basic circuit design to students so that they could make their own PCBs (https://www.youtube.com/watch?v=VlHed43yHbw ) This particular YouTube video actually contained the schematic used by the student.

Dubbie

RE: Arduino UNO Clone for DIYers - Updated!!

balearicdynamics — Tue, 03 Sep 2019 19:22:14 GMT

Very good project. You kept the essentials of the Arduino philosophy (maybe the logic) with a good customization.

Enrico

RE: Arduino UNO Clone for DIYers - Updated!!

neilk — Tue, 03 Sep 2019 18:04:33 GMT

Hi Andrew,

Great project! Thanks for sharing it.

How old is your daughter? Wonderful that she should have such a dream! I hope she realises it [View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-55554b80-8432-4f6f-a229-af261d9a7d5b/contentimage_5F00_1.png:16:16]

Neil

RE: Arduino UNO Clone for DIYers - Updated!!

shabaz — Tue, 03 Sep 2019 15:39:43 GMT

Hi Andrew,

Nice project. Also, the USB socket you've chosen is a good choice anyway. While it's not as straightforward as an all-through-hole connector, but since it has two through-hole lugs, then it's easy to hand-solder, by using some solder paste on the surface mount pins, and touching the pins with the soldering iron (since the through-hole lugs allows for perfect alignment). Sometimes I'll apply some epoxy glue to it afterwards (with care since there is a high risk of it getting through the shell and making the socket un-pluggable : ).

RE: Arduino UNO Clone for DIYers - Updated!!

genebren — Tue, 03 Sep 2019 14:41:34 GMT

What a fun little project. Good to see that your daughter has such big dreams. Here is a possible through hole USB micro B connector https://www.newark.com/gct-global-connector-technology/usb3130-30-a/micro-usb-2-0-type-b-receptacle/dp/16X9664?st=usb%20… (all I could find was vertical mounts styles) I have used one of these on a project for one of my clients, which worked out well with his board as top access was easier with his project (above and air-tight case).

Good luck!

Gene