Arduino Pro Mini 328 Compatible 3.3V 8MHz (BeeStore Brand)

This Arduino Pro Mini is a microcontroller board based on the ATmega328. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 8 analog inputs, an on-board resonator, a reset button, and holes for mounting pin headers. A six pin header provides the connection to an TTL to USB converter allowing programming the Arduino Mini Pro using a computer.

There are two version of the Pro Mini. One runs at 3.3V and 8 MHz, the other at 5V and 16 MHz. This one on offer here is the 3.3V and 8MHz version.

This particular Pro Mini on offer here is branded as BeeStore Pro Mini and it features a larger onboard Linear Voltage Regulator AMS1117 to replace the smaller size MIC5205 LDO type of Voltage Regulator. AMS1117 has higher current rating (up to 1A) where as MIC5205 has a much lower current rating (up to 150mA only). Please google AMS1117 and MIC5205 in internet to check for yourself each other differences.

Summary

Microcontroller:- ATmega328P

Operating Voltage:- 3.3V (depending on model)

Input Voltage :- 3.3- 12 V ( If use 3.3V , input 3.3V to Vcc, otherwise input to RAW pin 5 - 12V)

Digital I/O Pins:- 

*14 Digital pins label as RXI,TXO, 2 to 13

      (of which 6 provide PWM output, which are pin 3, 5, 6, 9, 10, and 11)

*8 Analog Input Pin 

      (label as A0, A1, A2, A3 and A4, A5, A6, A7)

DC Current per I/O Pin allowed 40 mA, but max total allowed 150mA for sum of all pins.

Flash Memory 32KB

SRAM:- 2 KByte

EEPROM :- 1KByte

Clock Speed:- 8MHz 

Input / Output Pins:-

Each of the 14 digital pins on the Pro Mini can be used as an input or output, using pinMode(), digitalWrite(), and digitalRead() functions. They operate at 3.3 or 5 volts (depending on the model). 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. In addition, some pins have specialized functions:

Serial: 0 (RX) and 1 (TX). Used to receive (RX) and transmit (TX) TTL serial data. These pins are connected to the TX-0 and RX-1 pins of the six pin header.

External Interrupts: 2 and 3. These pins can be configured to trigger an interrupt on a low value, a rising or falling edge, or a change in value. See the attachInterrupt() function for details.

PWM: 3, 5, 6, 9, 10, and 11. Provide 8-bit PWM output with the analogWrite() function.

SPI: 10 (SS), 11 (MOSI), 12 (MISO), 13 (SCK). These pins support SPI communication, which, although provided by the underlying hardware, is not currently included in the Arduino language.

LED: 13. There is a built-in LED connected to digital pin 13. When the pin is HIGH value, the LED is on, when the pin is LOW, it's off.

The Pro Mini has 8 analog inputs, label as A0, A1, A2, A3, A4, A5, A6 and A7, each of which provide 10 bits of resolution (i.e. 1024 different values). 

I2C: A4 (SDA) and A5 (SCL). Support I2C (TWI) communication using the Wire library.

Reset Pin:- Bring this line LOW to reset the microcontroller. Typically used to add a reset button to shields which block the one on the board.

Communication:-

The Arduino Pro Mini provides UART TTL serial communication, which is available on digital pins 0 (RX) and 1 (TX). The Arduino software includes a serial monitor which allows simple textual data to be sent to and from the Arduino board via a USB connection.

A SoftwareSerial library allows for serial communication on any of the Pro Mini's digital pins.

The Arduino Pro Mini also supports I2C (TWI) and SPI communication. The Arduino software includes a Wire library to simplify use of the I2C bus.

Programming:-

The Arduino Pro Mini can be programmed with the Arduino software through a USB to TTL serial converter connected to the Arduino Pro Mini 6 header pin side. Only 5 line need to be connected, because GND pin repeated.

This Arduino Pro Mini 6 header pin side for programming has the following pin label:-

BLK (meaning black, it is the repeated GND pin, no need to connect)

GND

VCC

RXI

TXD

GRN (Meaning green, it is the DTR pin, to connect to DTR of USB TTL Serial Converter)

Connection for programming with a CH340G USB TTL serial Converter is as followed:-

CH340G USB TTL Serial <------> This Pro Mini 3.3V 8MHz

BLK<------>no connect

no connect<-------->CTS

GND<------>GND

VCC<------>VCC

RXI<------>TXD

TXD<------>RXI

GRN<------>DTR

Total 5 line connection.

CH340G USB TTL Serial side 3.3V/5V Selection Switch need to set to 3.3V side.

Package included:-

1. Arduino Pro Mini 328 Compatible 3.3V 8MHz Board (BeeStore Brand)

  - Soldered for you the 6pins meant for programming

  - Soldered for you the 2X12pin 1X4pins on the other 3sides (All pins soldered)

  -Test for you to confirm program uploading ok

  (Picture show 2pcs of Pro Minis. one pcs showing the front view and another showing the back view, if you order 1 pc you will get 1 pc only)