Assembling JeonLab mini v1.3

First of all, let’s take a look at the top and the bottom of the PCB.
JeonLab mini v1.3 top
JeonLab mini v1.3 bottom

1. Attach 3 resistors and a capacitor: solder 2 of 1k ohm (brown-black-red-gold) resistors and 1 of 10k ohm (brown-black-orange-gold) resistor and 0.1uF ceramic capacitor (need to bend legs) where they are marked on the bottom
JeonLab mini v1.3 bottom parts soldered

2. Flip the PCB over, put the 28-pin DIP socket (socket only while you are soldering, DO NOT insert the ATmega328p yet), the ceramic resonator (3 legs, 16MHz, with built-in capacitors), and 2 LEDs (colors doesn’t matter: green for Power and red for d13 or other way around. It’s your choice) on the top layer and solder them.  **NOTE** BE CAREFUL FOR THE ORIENTATION OF THE MICROCONTROLLER CHIP AND THE POLARITIES OF THE LEDs (long leg is positive +).
JeonLab mini v1.3 28-pin dip socket and resonator soldered

JeonLab mini v1.3 LEDs and resonator soldered

3. Now it’s time to attach the male headers (Note: Depending on your project or your preference, you can put female headers (not included in the kit) or simply solder wires directly to the holes or right angle headers or whatever :-).
In order to solder the headers nicely (perpendicular to the PCB), you can use breadboard (not included in the kit) to support headers.
JeonLab mini v1.3 header solder prepare 1

JeonLab mini v1.3 header solder prepare 2

And then, put the PCB on top of the headers and solder them.
JeonLab mini v1.3 soldering header

Lastly, insert the ATmega328p into the socket.
JeonLab mini v1.3 assembled 2

That’s it! Now it is ready to use.
So simple, isn’t it?

Even though pin numbers and names and PWM(~) signs are printed next to their pins, due to their small sizes, it is really hard to see with bare eyes. So I marked with black permanent marker on the side of the PCB around the FTDI pins and between the digital pins and analog pins on the other side as shown below. It really helps!

FTDI pins (DTR-RX-TX-5V-nc-GND)
JeonLab mini v1.3 black mark FTDI

JeonLab mini v1.3 black mark power

Should you have any questions, please leave comments.
You don’t have one yet and want to buy one? Please visit my SHOP.

3 thoughts on “Assembling JeonLab mini v1.3

  1. Hi! I really like your mini-arduino!
    I am trying to do something similar but it doesn’t work. Does the pin1 (reset) needs a pull-up/pull-down resistor in order for the chip to work? My board does not have pins for external programming, I am programming the chip using and Arduino.
    The Chip works on arduino but not on my board..

  2. Thank you, I messaged you this morning at 6 am before going to work, I guess I was not fully awake yet! Anyway now I took a better look at your circuit diagram and I added the pull up resistor. Now everything is working fine.Thank you for your help!

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