![]() ![]() Pro-mini board including Microchip MIC5205 LDO (Low Drop Out) voltage regulator and it requires only several hundred mV for output 5V regulated voltage I mentioned several challenges in the head of this story.Īmong them, choosing power supply voltage and cascading two I2C devices (0.91 inch OLED and DS3231 RTC) is included.įirstly, I choose 6V for power supply voltage because of the following reasons. “Which type of board I bought” is the first challenge I faced to start clock project. Huh?Īlso pin layout is very different from Uno and Micro boards and confusing.Įspecially location of I2C pins including A4 (SDA) and A5 (SCL) (analog pin 4 and 5) on the pro-mini board is interesting. The marking on the backside of the board saying “simple”…. There seems diverse pro-mini boards are available using different Input voltage (3.3v, 5v), processor type (ATmega328P, ATmega168) and clock speeds (8M, 16M, 20M). ![]() Arduino Pro Mini (5V, 20 MHz) w/ ATmega328P ? ![]() Arduino Pro Mini (5V, 16 MHz) w/ ATmega328P Arduino Pro Mini (3.3V, 8 MHz) w/ ATmega168 Arduino Pro Mini (3.3V, 8 MHz) w/ ATmega328P Therefore, I was searching web pages to get information about pro-mini board.Īnd I knew that there are several variants are available as follows. When I saw the “The simple” marking at the backside of the board, it seem like playing joke on me. Let’s start story about making digital clock with pro-mini.Īs you can see, there are no kind and detail explanations available about the board I received.Īlso soldering pin-heads by myself is necessary. That’s why I’m choosing pro-min board as its price is the half of Uno and Micro boards.īut according to the how-to in several web-pages I saw, pro-mini is a little bit special for configuring and using it. When you using arduino Uno or Micro boards, circuit wiring and uploading program is very easy as there are many how-to contents are available in Internet.īut for the simple project such as clock making, personally thinking that using expensive Uno or micro boards is a kind of luxury. Choosing correct voltage regulator is necessary for power up the clock circuit 0.91 inch OLED is using I2C interface and DS3231 real time clock module also using I2C for communication As pro-mini board lacking USB interface for programming, additional break-out board (USB to serial programmer) is necessary for uploading sketch code Pro-mini board type is very confusing as 3.3v and 5v type of boards are available While making the circuit above, I need to handle several challenges like below. Therefore, simple project is chosen as digital clock making is relatively easy and not much complex. It’s the first time for me to utilize the very small OLED display and tiny pro-min board. Thanks to work by Andre Moehl on *uino Mini Super (Atmega328PB) project on hackaday.This is digital clock using 0.91 inch OLED and arduino pro-mini.*/ int led = 0 int led1 = 1 int led2 = 2 int led3 = 3 int led4 = 5 int led5 = 6 int led6 = 9 int led7 = 10 int led8 = 11 int brightness = 0 // how bright the LED is int fadeAmount = 5 // how many points to fade the LED by // the setup routine runs once when you press reset: void setup ( ) // wait for 30 milliseconds to see the dimming effect Leds are connected to all the 9 pins as shown. ![]()
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