This is a Tiny development board I made. It is a small size and is ideal for quick prototyping. I made for the Attiny2313 microcontrollers. I started programming with this microcontroller board. Back then I did it on a breadboard. But since now I can know a few things about PCB etching I made this PCB.
Attiny2313 Datasheet
https://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-2543-AVR-ATtiny2313_Datasheet.pdf
I made this circuit schematic.
I changed a few components from the schematic. The current limiting resistor for the LED is 330 ohm in the schematic whereas I used 1.8k ohm. While performing few tests on the LED I found that the LED is visible at that lower current value.
For a 5 V supply and an 1800 ohm resistor, the current will be 2.7 mA. Which is enough for visual identification at short distances.
The Two buttons are not yet populated. They are provided as a future provision.
The Tiny2313 Dev Board is programmed using the USBASP v2 programmer.
The 6-pin male header is connected to the programmer. When not doing the programming the pins can be used as GPIO.
Here is the table of components I used for this PCB.
| Components | Description | Quantity | Populated |
|---|---|---|---|
| ATtiny2313 PDIP | Microcontroller | 1 | yes |
| PDIP 20 Pin IC Socket | Microcontroller IC Socket | 1 | yes |
| 8Mhz Crystal Oscillator HC49 | Crystal Oscillator | 1 | yes |
| 12pf Ceramic Disc Capacitor | Crystal Load Capacitors | 2 | yes |
| 1×2 Male Berg Header | For Power Connection | 1 | yes |
| 1×3 Male Berg Header | For UART (RX, TX) and INT0 | 1 | yes |
| 1×6 Male Berg Header | For Programming and as GPIO | 1 | yes |
| LED 3mm Red clear lens | LED | 1 | yes |
| 1.8k Resistor 1/8w | LED Current Limiting Resistor | 1 | yes |
| 10k Resistor 1/4w | Pull Up Resistor For RESET | 1 | yes |
| 10k Resistor 1/8w | Pull Up resistors | 2 | no |
| Tactile Switch 2 pin | Push Buttons | 2 | no |
I designed the PCB in KiCad. And made the PCB using etching photoresist.
You can read How to make single-layer PCB using Dry Photoresist Film Etching Method
As you can see in the image bellow . Home PCB making is not a perfect solution. But it gives you immense learning about the process.
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