|Input Voltage||7-9 V|
|Digital I/O Pins||14 (of which 6 provide PWM output)|
|Analog Input Pins||8 (of which 4 are broken out onto pins)|
|DC Current per I/O Pin||40 mA|
|Flash Memory||32 KB (of which 2 KB used by bootloader)|
|Clock Speed||16 MHz|
The Arduino Mini can be programmed with the Arduino software (download
). For details, see the reference
To program the Arduino Mini, you will need a USB Serial adapter
or other USB or RS232
to TTL serial adapter. See the page on getting started with the Arduino Mini
on the Arduino Mini comes preburned with a bootloader
that allows you to upload new code to it without the use of an in-system-programmer. The bootloader communicates using the original STK500
, C header files
You can also bypass the bootloader and program the ATmega328
with ICSP (In-Circuit Serial Programming); see the page on bootloading the Mini
for information on wiring up an ICSP header to the Mini and the programmer
for instructions on using a programmer to upload a sketch.
Input and Output
Each of the 14 digital pins on the Mini can be used as an input or output. They operate at 5 volts. Each pin can provide or receive a maximum of 40 mA and has an internal pull-up resistor (disconnected by default) of 20-50 kOhms. Pins 3, 5, 6, 9, 10, and 11 can provide PWM output; for details see the analogWrite()
function. If anything besides the Mini USB (or other) adapter is connected to pins 0 and 1, it will interfere with the USB communication, preventing new code from being uploaded or other communication with the computer.
The Mini has 8 analog inputs, each of which provide 10 bits of resolution (i.e. 1024 different values). Inputs 0 to 3 are broken out onto pins; input 4 to 7 require soldering into the provided holes. By default the analog inputs measure from ground to 5 volts, though is it possible to change the upper end of their range using the AREF pin and some low-level code.
See also the mapping between Arduino pins and ATmega168/328 ports
the pinout changed from version 03 to version 04 of the Mini, please be sure you use the right diagram.
Pin out of the Arduino Mini 03. (older versions are compatible, but missing the IO7 header at the top)
Pin out of the Arduino Mini 04 and 05. (Note that the ground pin on the left has moved down one pin.)