Questions tagged [arduino-pro-mini]

An Arduino Pro Mini is a small microcontroller derived from the Arduino Uno using the ATmega328. It is unique for its tiny size and the required external FTDI adapter.

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Most compact method of powering Arduino from wall socket

There are a lot of methods to power an Arduino from a large range of voltages: USB cable from PC or from a phone charger or an USB hub step down converters step up converters switching power supply ...
vlad b.'s user avatar
  • 719
21 votes
3 answers
16k views

Arduino Pro Mini (3.3V version) input voltage range / tolerance

I have a few Arduino Pro Mini clones (cheap Chinese stuff) and would like to power them with 12V power supply (same as fan voltage). According to the Arduino Pro Mini spec the RAW pin can take 3.35-...
DominicM's user avatar
  • 597
16 votes
4 answers
40k views

All the differences between Arduinos: Pro Mini & Pro Micro

I'd like to know the differences between these two boards: Arduino Pro Mini and Arduino Pro Micro. Even if I've read this and this related post, it is not clear enough. I've always used the Arduino ...
nkint's user avatar
  • 461
9 votes
2 answers
3k views

very lightweight low power microcontroller with memory?

I have build a couple of projects using arduino. For a new project I want to log skin surface temperature vs. time (just perhaps a few times per day) and possibly other easy to obtain info such as ...
Shara's user avatar
  • 125
9 votes
1 answer
8k views

Problem programming Mini Pro via Arduino as ISP

I just picked up a pair of Arduino Mini Pro 5v clone boards (Inland, sold at Microcenter, currently $4 USD) and I wanted to use my Uno as an ISP like I've done with ATmega328 and ATtiny85 chips before....
Dennis Munsie's user avatar
8 votes
2 answers
13k views

Audio Frequency White Noise generation using Arduino Mini Pro

For DIY, how to program Arduino Mini Pro to act as an Audio Frequency White Noise generator? Presumably, a) using one Digital Output pin b) feed to a simple passive RC low pass filter to reduce ...
EEd's user avatar
  • 904
7 votes
7 answers
14k views

Arduino 16 MHz with only 3.3V?

Now I have these Arduino Pro Mini from Sparkfun. They are the latest version that I know (yeah, it's the one that have those horrible misaligned pins). Now they are designed around the ATmega328P and ...
Dat Ha's user avatar
  • 2,913
7 votes
1 answer
3k views

Pin 13 fires relay when powering on... How to disable?

Pin 13 fires relay when powering on... How to disable? I'm using pro mini 5v 16MHz and a DC 12V 2 Channel Relay Module Optocoupler. The relay Jd-VCC is powered by a 12V and it's VCC is 5V (the same as ...
P-nut's user avatar
  • 71
7 votes
3 answers
440 views

Measuring li-ion that arduino is running from

I am using a 5v Arduino pro mini (with regulator and power led removed). I have been reading how to accurately measure Li-ion batteries when powering from the same battery you are trying to measure ...
Lindsay Cox's user avatar
7 votes
5 answers
12k views

Programming arduino via bluetooth module issue

I followed a tutorial on how to setup arduino and bluetooth so it can be programmed without usb cables. I didn't use capacitors or resistors asthere doesn't seem to be a need for them. I have the ...
DominicM's user avatar
  • 597
7 votes
4 answers
16k views

Watchdog timer stuck in restart loop? (green led flashing)

I am trying to set up a way to reboot arduino on command. The code below should do that but it seems like my arduino just get's stuck in some sort of a loop where I cant upload or get any serial ...
DominicM's user avatar
  • 597
6 votes
10 answers
32k views

avrdude: stk500_getsync(): not in sync: resp=0x00

I have arduino pro mini 5V, 16M ATMega328 and CP2102 USB to TTL. I've wired them like this: When I try to upload a sketch to the arduino board I'm getting the following error: avrdude: ...
Deepsy's user avatar
  • 157
6 votes
2 answers
3k views

Why bootloader sizes differs from 0.5 to 8 kilo bytes for different boards?

According to official web info bootloader sizes are 0.5, 2 and 8 kilo bytes for UNO, Pro mini and ATMega2560. I believe all three boot loaders do similar job of receiving serial link data and write to ...
EEd's user avatar
  • 904
6 votes
3 answers
1k views

Crash when datalogging MPU-6050 to SD card

On an Arduino Pro Mini, I'm using Jeff Rowberg's stuff in i2cdevlib to read from the MPU6050, and using SdFat to write data to an SD card. Each part in isolation is fine, but when both DAQ and logging ...
Craig Graham's user avatar
6 votes
1 answer
2k views

delete the memory or re-upload a program

At the moment I am following the instructions of this project https://github.com/JoernL/LimiTTer. Besides the peripheral parts like a Bluetooth module and an NFC module, the central unit is an Arduino ...
verticoe's user avatar
5 votes
3 answers
9k views

Soldering Arduino Pro Mini's disaligned pins

I have a couples of Arduino Pro Minis (original from sparkfun) that have those 4 disaligned pin. Unfortunetely, I need to use 2 of them, A4 and A5, because they are the I2C pins and I want to solder ...
Dat Ha's user avatar
  • 2,913
5 votes
3 answers
2k views

How to power my Arduino mini using wall socket?

I am trying to power my Arduino Mini (which is connected to IR receiver and a relay board). The idea is to hide the entire setup behind the electrical board including the power supply. I have hacked ...
karx's user avatar
  • 235
5 votes
5 answers
5k views

Arduino PRO Mini - The pads [was "jumpers"] on the back and Low Power Consumption

I've noticed that on the back of an Arduino PRO mini are two Jumpers next to the A4 and A5 pins, marked with red in the following : Looking at the leads one seems to be a bypass for the POWER Led and ...
Tiberiu C.'s user avatar
5 votes
1 answer
3k views

Why does this Arduino Pro Mini use a capacitor on the DTR reset line?

I'm kind of curious as to why there is a 0.1uF capacitor on this Arduino Pro Mini (https://www.arduino.cc/en/uploads/Main/Arduino-Pro-Mini-schematic.pdf). It seems like it would work just fine without ...
Izzo's user avatar
  • 243
5 votes
1 answer
11k views

Wire.endTransmission() Hangs

I have written a code that transmits data over the I2C channel, The device ID and every other stuff is working fine. The only issue being that my code gets stuck at Wire.endTrasnmission(). I found ...
ArunMKumar's user avatar
5 votes
2 answers
6k views

Having difficulty uploading sketch to an Arduino Pro Mini

Having developed and tested a project using an Arduino Uno, I would now like to upload it to an Arduino Pro Mini (5V, 328, 16MHz) for semi-permanent, long-term use, but I can't get any sign of life ...
Tim Morley's user avatar
5 votes
2 answers
2k views

How can I use PWM in power saving mode (ATmega328)?

I fail to use PWM in power saving mode. The output behaves erratically. This should be possible, I guess. The following is a minimal working example: /* MWE: Cannot use PWM in any power saving ...
stefan's user avatar
  • 153
5 votes
2 answers
440 views

Arduino Freezes (probably because of I2C) - Need help to write robust script

Arduino Pro mini 3.3V stucks few hours after startup. After repowered, it begins to stuck within a few seconds. If I wait long enough before turning it on it stucks little later for example now it ...
CaveScientist's user avatar
5 votes
1 answer
832 views

Powering fans and arduino pro mini from single 12v supply

So, I have a 5V Arduino Pro Mini, which is running the logic behind a multi-DHT22 sensor array, and using that input to control a 12v 24mm fan (12v, 0.16 A). This is currently a working board on an ...
jvc26's user avatar
  • 255
5 votes
1 answer
3k views

Trouble connecting Arduino Pro Mini (Atmega328, 3.3V) to nRF24L01 over SPI, receiving all 0 values when I use radio.printDetails();

I am trying to connect my Arduino Pro Mini 3.3V to an nRF24L01 transceiver and cannot see what I am doing wrong. I've checked my wiring a million times because the problem hints there is an invalid or ...
Johnny Barton's user avatar
5 votes
3 answers
8k views

Corrupted output from HC-05 Bluetooth module

I have arduino Pro Mini 3.3V version with hc-05 module connected to 3.3V/GND and RXI/TX0 pins. I am then using my android phone to connect to the module. It shows up and pairs fine. Then I use ...
DominicM's user avatar
  • 597
4 votes
3 answers
3k views

Arduino Pro Mini is burned by 12v. Can I save it?

I have this Arduino Pro Mini clone (ATmega328) 5v. I gave it exactly 12 volts through the RAW power input, but it instantly got hot and started fuming. Fumes were coming out of the area close to the ...
Sergio's user avatar
  • 57
4 votes
2 answers
15k views

Convert Arduino Pro Mini 5v to use 3.3v

Id like to make my 5v pro mini use 3.3 v instead of 5 because i want to use it in an existing piece of electronics that uses 3v throughout. Looking at the specs for the pro mini it says the 3.3v ...
S Rosam's user avatar
  • 141
4 votes
4 answers
4k views

Arduino Pro Mini Serial Monitor garbage

This is my first post. I hope that I am posting in the right section of the forum. Otherwise, could an admin move this topic to the appropriate section please? Board : Arduino Pro Mini 3.3V 8MHz ...
Luca Andrei's user avatar
4 votes
5 answers
8k views

Powering a 5V Arduino Pro Mini with 3.3V

I want to run the 5V board at 3.3V because I can get the 5V version cheaper than the 3.3V version. I read that you can power the Arduino Pro Mini with a battery by connecting the battery to the 5V ...
laktak's user avatar
  • 143
4 votes
2 answers
6k views

Why is AREF connected to a capacitor in the Arduino Pro Mini Schematic?

I'm currently looking at the Arduino Pro Mini schematic and have noticed that the pin AREF (analogue reference) is connected to a 0.1uF capacitor as shown below: I have done some research and read ...
Lachlan Etherton's user avatar
4 votes
2 answers
795 views

MAX7219 powered on via digital pin set to HIGH is not working good (I < 25mA)

I'm using 7-segment 8-digits MAX7219 eBuy module in my battery-supplied ATMega168P project to output some readings. MAX7219 in powerdown mode draws ~150uA (as stated in the datasheet) which is too ...
finnan's user avatar
  • 302
4 votes
2 answers
1k views

Arduino mini pro as ISP for Atmega329P-PU serial monitor failing

After trying a lot of tutorials and manuals around the web including at least 20 solutions here on StackExchange, I don't know what to try anymore. My goal is to write a message in the serial monitor ...
Thijs's user avatar
  • 432
4 votes
1 answer
555 views

Arduino stopwatch, which board to use?

I am planning on making a simple stopwatch with: A display One or two additional buttons to start the stopwatch and stop the stopwatch and maybe reset it. The problem is that it has to be as small ...
Valentin Grégoire's user avatar
3 votes
5 answers
34k views

How to have an Arduino communicate with 3 other Arduinos?

I was wondering how I can get 4 Arduinos in total to communicate with each-other through a wired connection. The goal is to have the master Arduino send a number 0-100 to each of the other Arduinos. ...
Marcello B.'s user avatar
3 votes
4 answers
9k views

Powering from 3V coin cell to VCC, using I/O pin as supply GND

I'm thinking of creating a "small" electronic dice. (I will solder the button a little different though xD) But there are some concerns on my design: Powering from a coin-cell It's a 5V arduino Pro ...
aaa's user avatar
  • 2,695
3 votes
2 answers
1k views

Is it possible to program a few Arduinos at the same time?

I have 10 Arduino Pro Minis and one Arduino Uno. Via breadboard, if I connect Pro Minis in parallel, can I program all of them at same time? Is it possible?
siniradam's user avatar
  • 133
3 votes
3 answers
7k views

Using 3.3V XBee with Arduino Pro Mini 5V Version

The Xbee requires a 3.3V power input and the Arduino Pro Mini (5V version) only provides a regulated 5V. Question: What will be the simplest way to provide a 3.3V rail to the XBee from the Arduino ...
Nyxynyx's user avatar
  • 1,389
3 votes
2 answers
8k views

IR Receiver interrupt and arduino sleep mode

I need to put my arduino into the sleep mode in order to consume less power. My arduino receives IR data and do some work with it, but I need to make it sleep until there is no data. If the data has ...
CROSP's user avatar
  • 141
3 votes
2 answers
210 views

How to turn LEDs based on voltage readings?

I am trying to turn LEDs in an LED bridge based on the voltage reading from a power source. when the Voltage is zero nothing is ON and then the LEDs gradually turn ON as increase the voltage connected ...
Anwar Elhadad's user avatar
3 votes
4 answers
4k views

What is the lowest resistance pot that is useful with an analog input?

Background I've dabbled in electronics since my parents gave me a 150-in-1 kit in the 1970's but never had formal training. My dad repaired Honeywell mainframes so taught me to solder when I was 8. I ...
Kelly S. French's user avatar
3 votes
2 answers
788 views

Newbie - What is the Difference Between Power Supply's GND and Arduino's GND?

I am new to electronics and Arduino. What is the difference between power supply ground and Arduino's ground. If I connect my LED cathode to power ground, it doesn't work. But if I connect it to ...
maomaopop's user avatar
3 votes
2 answers
5k views

What is the best serial protocol for bidirectional communication with NodeMCU?

Except hardware UART. Main requirements are reliability and simplicity of use. Speed isn't as important. Details: I have an Arduino Pro Mini (ATmega328P 5V) controlled via UART. I wish to connect an ...
kaay's user avatar
  • 223
3 votes
2 answers
8k views

Arduino Pro Mini (5V) Raw Pin and VCC Pin

I am new to the microcontroller world and circuits, so bare with me. I recently bought some 5V arduino pro mini microcontrollers. I have been playing with them and they work fine, I have been powering ...
lomas09's user avatar
  • 191
3 votes
2 answers
2k views

Can I use arduino pro micro rx tx as digital pins

I'm using arduino pro micro Atmega32u4 5v 16Mhz I want to use it to make a HID Keyboard and Mouse but I ran out of pins so I was wondering if I can use the RX and TX pins as digital input pins. Will ...
Keima-kun's user avatar
3 votes
1 answer
94 views

Arduino Pro Mini

I have the following problem I have a pro mini clone, with 328/5V. It was successfully working in my board. I pulled it out of the board, and wanted to update my software. I connected it to my FTDI, ...
Petr Osipov's user avatar
3 votes
1 answer
295 views

Timer interrupt triggers too often

The following question is based on the Arduino Pro Mini (8MHz, 3.3V) I'm in process of developing (yet another) LED strip driver shield. For that I wrote a simple control loop, that adjusts the ...
Patrick's user avatar
  • 33
3 votes
1 answer
456 views

Pushing sketches to pro mini with Uno 101

So I just bought a Pro Mini the other day, however, I didn't get an FTDI cable or a USB/Serial converter board. From what I understand from this article I can use my Arduino Uno 101 to push sketches ...
chewpoclypse's user avatar
3 votes
2 answers
2k views

Cannot move TM1637 from Uno to Pro Mini

I have a very simple setup which works fine with an Uno. #include <SevenSegmentTM1637.h> #include <SevenSegmentExtended.h> const byte PIN_CLK = 2; const byte PIN_DIO = 3; ...
Railsana's user avatar
3 votes
1 answer
441 views

Waking up async the Arduino while it is sleeping periodically

I´m using LowPower.h and PinChangeInt.h libraries to put my Arduino into the sleep mode every 8 seconds and then it wakes up, modifies a counter and it goes to sleep again, but also I need to wake it ...
cpinamtz's user avatar
  • 175

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