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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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32 views

PIR sensor using interrupt always on. Why?

I am using an arduino pro mini 3.3V connected to a PIR sensor ST-00081. The connection is as follows: PIR directly to 3.3v from the PSU board. OUT to arduino pin 3 (2 is occupied). En left floating (...
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1answer
41 views

Can batteries be damaged? [closed]

I have some questions when it comes to draining batteries with low power projects. I have been making a few low power projects with Arduino Pro Minis running on batteries. Some run on single non-...
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1answer
37 views

LDC paired with Arduino locks up and freezes. Out of SPRAM?

I am making an alarm clock using a 4x20 lcd display, rtc, and Arduino Pro Mini 3.3v. I have implemented a menu system for setting the time/date that blinks the text on the lcd display to indicate that ...
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0answers
28 views

Correct Thermistor readings on battery-powered Arduino Pro Mini?

How to read proper value of thermistor on battery-powered Arduino Pro Mini 8Mhz/3.3V? Do I need some "reference" voltage? The value changes when voltage changes, like: battery voltage drop ...
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1answer
27 views

How to use the 0.91' 128*32 OLED by arduino pro mini?

I buy a OLED as picture below, I want to use https://github.com/adafruit/Adafruit_SSD1306 to control it. But the example of https://github.com/adafruit/Adafruit_SSD1306 can't be compiled. The error as ...
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27 views

Lost code already loaded on Adruino Pro mini [duplicate]

Can I retrieve the code from an already programmed Adruino Pro mini 328? I have found avrdude who can make a perfect copy of the loaded firmware, but I just want to have the code back.
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2answers
165 views

Connect arduino pro mini 3.3v to 5v

Is it safe to run an arduino pro mini 3.3v by 5v? I mean directly connect 5v to vcc not raw pin.
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1answer
47 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 ...
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1answer
292 views

Sending PUBX commands to GPS Board (Ublox NEO-6M) through SoftwareSerial

I am having trouble parsing NMEA sentences coming from a GY-NEO6MV2 board (https://www.cytron.io/p-gps-neo6mv2), using the TinyGPS (https://github.com/mikalhart/TinyGPS) library. The GPS board itself ...
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1answer
103 views

ATmega328P of Arduino Pro Mini not responding

While I was trying to change the fuse bits of ATmega328P of my Arduino pro mini using a USBasp device to operate it at 3.3 V/8 MHz, it failed due to the bad connection I guess. After that, ...
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1answer
93 views

GPS: Not receiving any valid output from ATGM336H

I have an Arduino Pro Mini along with a GPS Unit - ATGM336H. Below is the sketch I'm currently using: #include <SoftwareSerial.h> #include "Ublox.h" SoftwareSerial GPS(4,5); Ublox serial_gps; ...
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53 views

Flashing firmware in ft232rl

I am new with arduino and hardwares at all and I am having some problems in a project where I want to assemble the head tracker device from this project https://git.iem.at/DIY/MrHeadTracker/wikis/mrht-...
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1answer
42 views

Reducing Clock Speed increases sketch size?

I just lowered the clock speed of my arduino promini 3.3v - 328p from 8Mhz to 1Mhz on the external clock disabling the brounout detection and when I compiled I my old sketch it wouldn't upload any ...
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0answers
46 views

Turn off battery charging and use battery to run arduino

I have a project that is configurable, so it is sleeping most of the time but in specified intervals wakes up, do some measurements and turn on a small water pump for a few seconds. My aim is to ...
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1answer
56 views

Strange behavior on bitwise operation

i am trying to write a simple program that writes the outputs of an accelerometer (which comes down to 3 analog inputs) onto an SD-Card. I got the hole thing working fine (sending the values as ...
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1answer
75 views

Why is Arduino Pro Mini not powering this LED?

First off, I'm very new to Arduinos and electronics in general, so feel free to explain like I'm 5. As a bit of background to this question, the project is simply using a Pro Mini to run a servo, ...
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1answer
81 views

Control solenoid valve with arduino running on battery

I built a simple setup according to this tutorial using a 9v battery (in the meantime replaced it with a 120A battery): https://www.bc-robotics.com/tutorials/controlling-a-solenoid-valve-with-arduino/ ...
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1answer
246 views

Can't power HC-05(5v) with Arduino Pro mini (3.3v)?

I am trying to use HC-05 (5V) with Arduino Pro Mini (3.3v) but I have had little success. I am using a coin cell to power the pro mini which powers it on and is working fine. But, my HC-05 doesn't ...
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4answers
316 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 ...
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1answer
221 views

How to externally power HC-05 module with Arduino Pro Mini?

guys, I am new to arduino. I am trying to power my HC-05 (5v with regulator to 3.3v) from Arduino Pro Mini 3.3v but I can't get it to power on. There is a problem: The site I bought HC-05 from says ...
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0answers
156 views

Is there a bridge needed to connect Pro Mini 3.3v to HC-05 (level 3.3v)?

I can't understand how to connect my arduino pro mini https://www.amazon.in/gp/product/B071ZCHW5P/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1 To my HC-05 Bluetooth module https://www.ebay.in/itm/...
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0answers
290 views

Arduino Pro Mini (5v) I2C pullups

I recently bought an ESP-WROOM-32 module and I want it to talk to my Pro Mini via I2C. Do I have to pull-up the lines to the 3.3v side (ESP32)? Since the Pro Mini runs at 5v, I think it's a bad idea ...
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0answers
179 views

NPN transistors level shifter [closed]

I'm going to use this for Arduino Pro Mini (5v version) to communicate with ESP32 via UART so I need level shifting. I found this circuit which uses NPN transistor and I'm also going to use it. This ...
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2answers
123 views

Did I overheat my Arduino while soldering to perfboard?

So this is the second time that I've had a circuit that worked perfectly on a breadboard, but as soon as I connected it to a perfboard and soldered the joints together, the Arduino stopped working and ...
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0answers
105 views

DHT11 is NOT reading data with Arduino Pro Mini 3.3V 8MHz

I am using DHT11 and Arduino Pro Mini, 3.3V 8MHz device with no USB. I am programming with FTDI adapter. It is successfully programmed after I set the connection settings between FTDI and Arduino Pro ...
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1answer
58 views

Can't re-write Arduino Pro Mini

I am just getting started with arduino, but I am having an issue with some 3.3V, 8Mhz Arduino Pro Minis. I am using a SparkFun FT232RL USB to Serial breakout (https://www.sparkfun.com/products/12731) ...
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0answers
50 views

Can't reprogram Arduino on protoboard (perfboard), but could program the same circuit on breadboard

So I have a circuit that works well when it's on a breadboard and without removing any pins I'm able to upload sketches, but for some reason when I transition it to a protoboard I can no longer upload ...
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1answer
19 views

Pro Mini atmega168 voltage woes

I have a fistful of Pro Mini clones with atmega168 ICs. Oddly they have 16MHz crystals. When I feed it nominal 3.7V (really 4V, but it will spend most time around 3.7) via the RAW pin, I see 2.6V on ...
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0answers
87 views

Installing Optiboot loader for pro mini 3.3V 8MHz

I have tried to install a better bootloader in some chinese Arduino pro mini boards. I have tried the OptiLoader application via an ArduinoAsISP. I failed in some way. The boards got unstable, I can ...
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1answer
89 views

Circuit works on breadboard but has power problems on protoboard

I'm building a simple circuit that takes data from an IMU (using MPU6050), sends it to a microprocessor (Arduino Pro Mini 5V) to apply data smoothing and averaging, and then this data is sent using an ...
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2answers
290 views

Controlling multiple fans using arduino uno

I'm kind of new on the field of Arduino. Although I have a question concerning multiple fan connection on 1 arduino PWM pin. The goal is to connect around 8 to 16 fans on 1 arduino pwm header pin and ...
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1answer
416 views

LoRa stops working after several hours. Arduino reset button ineffective

I am designing a master-slave LoRa link between two Arduino Pro Minis. The goal is to control a car heater a few hundred meters from my home. The master sends a command to the slave as needed. The ...
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1answer
950 views

Powering an Arduino Mini Pro using a CR2032 battery as a remote control

I'm looking into making my own remote control using an Arduino Mini Pro and some RF transceivers. The receiving end won't be a problem, but the remote will. I want to make it as small as possible and ...
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0answers
78 views

pro mini 168p 8MHz doesn't broadcast I2C address when powered by master

I tried to communicate between the Arduino Pro Mini and the OrangePi zero (master) using I2C. This is how I wired them: Arduino OPi0 SCL - SCL SDA - SDA RAW - 3.3V GND - ...
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0answers
132 views

interrupt driven ADC with I2C freezes arduino pro mini

In my project I use a pro mini to read 4 analog values. Those values are then passed over I2C to an RPi. So far I have been using analogRead to read in the values, does the job ok. Now I'd like to ...
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1answer
50 views

Need to control 2 DC motors powered using arduino mini and l298n from about range of 100m [closed]

I need to control 2 DC motors which are arranged with arduino mini and L298N module from a distance of 100m wirelessly, what is the easiest and cheapest way of doing so?I checked RC controllers and ...
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0answers
30 views

Analog Read gives Erratic behaviour in Struct

I'm getting some very strange behaviour from a Haptic feedback system I'm trying to make. The test code works fine as a Multiple-In One-Out in the main loop, but once I moved the code to the Struct, I ...
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1answer
513 views

ESP8266 cannot connect to an existing network after using AT command

I followed this tutorial to connect the ESP8266 to a wifi network using AT commands. I used the below schematics (without the connection between ESP's CPIO 0 and Arduino's Ground): After that, I was ...
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2answers
421 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 ...
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1answer
130 views

Auto Fish Feeder

Good day, I am new to Arduino, but have made some nice projects work. I have a n issue with a Auto fish feeder. I have used a servo that I modified to run 360. I am having a issue when the Nano board ...
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0answers
325 views

Wake up arduino mini with a external signal from a rf wake up receiver

I am working in an arduino which sleeps after 1.2 seconds of running time and wake up when receiving a signal in the pin 2, but this last part is not working. I tried with the four modes of the ...
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0answers
105 views

Arduino Proto Threading Servos [closed]

I have an arduino pro mini 5v that needs to complete 2 jobs at the same time: rotate a servo based on the data from a gyroscope, and rotate another servo based on the data from a pressure sensor. I ...
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2answers
278 views

Arduino pro mini not compiling after changing fuse to 128khz

I used Arduino UNO as ISP to change the fuse setting of Arduino Pro Mini. Using avrdude cmd, I successfully changed it to 8MHz setting. Due to curiosity, I decided to try changing it to 128kHz. But ...
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1answer
701 views

Powering Arduino Pro Mini with different voltage, fuse setting

Arduino Pro Mini commonly comes in two packages, 5V 16MHz and 3.3V 8MHz. The only difference between those two boards are regulator and clock crystal, right? What happens if I supply 2V to VCC pin of ...
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2answers
285 views

waking up arduino mini with a external signal

I have an arduino mini with an ultrasonic sensor conected to the pins 2 and 3, and a RGB LED connected to the 4,5, and 6, I want to include a wake up and sleep functionality that wakes up when receive ...
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0answers
138 views

Arduino Pro Mini ATmega 328P: garbage output on serial console

Arduino Pro Mini ATmega 328P 3.3V 8MHz, connected to USB port via USB to Serial breakout board built around the FT232RL FTDI chip. JTAGenum project code uploaded to the Arduino. I opened terminal and ...
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2answers
524 views

Pin change interrupt does not work properly to wake up arduino from sleep mode

I am building a timer circuit using Arduino Pro Mini Atmega168p 5v 16MHz (which later supposed to be become to adjustable one). Here is the current breadboard view. (I am supposed to use SS relay at ...
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1answer
159 views

Arduino for kids toy with Battery (safe), Can Arduino overheat the Battery with long running code [closed]

I am making a learning toy which kids can play with and learn basics of programming. But i am tired of keep replacing the AA batteries as they run out in few days. So i am thinking of using ...
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1answer
158 views

Can't upload to Arduino Mini via Arduino USB 2 Serial Converter

I bought an Arduino Mini and also an Arduino USB 2 Serial Converter. While trying to program the Arduino Mini, I get this error: avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x00 ...
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2answers
86 views

Can I set pin 13 to output 5v, then put arduino mini pro to sleep?

Can I set pin 13 to output 5v, then put arduino pro mini to sleep and it maintains 5v going through pin 13 while in sleep mode? I know there are various "levels" of sleep - can a voltage be ...