Article

Small is Beautiful: Minimod18

A new microcontroller board for Elektor ATmega projects

Minimod18 is a very compact general-purpose microcontroller module. It includes frequently required peripheral components, such as pushbuttons and an LC display, as well as several interfaces (USB, I²C and ISP/SPI). You only have to assemble the peripheral circuitry necessary for your specific application and connect it to the Minimod18. This way you can build a complete device with entry and display capability in almost no time.

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Materials

090773-11.zip

Extra info / Update

Microcontroller:
* Atmel ATmega328P-AU AVR RISC microcontroller
* 32 KB flash memory
* 1 KB EEPROM
* 2 KB RAM
* 8 ADC inputs
* 3 timers and 6 PWM channels
* 20 MHz clock
* I2C, SPI, and USART interfaces
* Supply voltage 1.8–5.5 V
Board:
* USB socket
* Power supply over USB possible
* 16 MHz crystal
* 64 KB EEPROM with I2C interface
* EADIPS082-HNLED LCD module (2(8 alphanumeric with LED backlight)
* Contrast adjustment trimpot
* 2 buttons
* Connector for SPI/ISP
* Connector for I2C and ADC

Components

The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
Want to learn more about our BOM list? Read the BOM list article for extra information.

Download the BOM list

Component list

Resistors
R1,R2,R5 = 2.2kOhm (0603)
R3,R4 = 68Ohm (0603)
R6 = 10kOhm (0603)
P1 = 10kOhm Trimmer (TC33)
Capacitors (0603)
C1,C2 = 22pF
C3–C6 = 100nF
Inductors
L1 = 10 µH (0603)
Semiconductors
D1,D2 = 3.6V (SOT23)
IC1 = AT24C512 (SO-08M)
IC2 = ATmega328-AU (TQFP32-08), programmed, Elektor order # 090773-41
Miscellaneous
LCD = EADIPS082-HNLED
K1 = 1-pin pinheader, right angled
K2 = USB-B socket
K3 = 6-pin pinheader, angled
S1,S2 = PCB mount pushbutton
X1 = 16MHz quartz crystal (ABM3)
PCB, order # 080950-1 from Elektor Shop
or
ready populated and tested module with preinstalled bootloader, Elektor Shop order # 090773-91