A small microcontroller board based on the ATmega168 or ATmega328 chip. Use this tag for questions specifically regarding the Mini, and not just general Arduino usage.
Questions tagged [arduino-mini]
47 questions
18
votes
1 answer
How do interrupts work on the Arduino Uno and similar boards?
Please explain how interrupts work on the Arduino Uno and related boards using the ATmega328P processor. Boards such as the:
Uno
Mini
Nano
Pro Mini
Lilypad
In particular please discuss:
What to use interrupts for
How to write an Interrupt Service…
Nick Gammon
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9
votes
2 answers
What is the maximum wire length for serial communication between two Arduinos?
I am building a project in which two Arduinos will be linked by three wires: TX an RX for serial communication and a common GND. What would be the maximum length of the wires here before communication gets affected?
I am using an Arduino Mega R3 on…
hobie
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5
votes
3 answers
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 more than a few power adapters (ranging from…
karx
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5
votes
2 answers
Store floats in and reading them from flash
How do I store floats in flash and how do I read them from there? (I need a look-up table for pairs of float values.)
The storing part doesn't seem to be so difficult as this compiles:
PROGMEM float value1 = 1.23456;
But how do I read them? Do I…
fuenfundachtzig
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4
votes
1 answer
Can not burn arduino pro mini 8 MHz bootloader with usbasp
I am using schematic of Arduino Pro mini 3.3v/8 MHz version. Please see below circuit diagram I built.
Power supply to circuit is 3.3V.
I have a USB ASP programmer which I used in previous version of same circuit running at 5V/16MHz. It was working…
adeel asif
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3
votes
3 answers
Ping IP address using ESP8266 connected to Arduino
I want to make a system using NeoPixels, an Arduino and an ESP8266 module to ping IP addresses on my network to determine if certain people are on our Wi-Fi (I'll be pinging mobile phones).
I'm finding it hard to find any help as to how to ping IP…
Blease
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3
votes
0 answers
Read from the SD card - ACMD41 times out
I'm trying to read from the SD card using an Arduino Pro Mini (3.3 V), Pololu micro-SD reader (the 3.3V one) over a SPI protocol.
I've tried both the SD library from Arduino SDK, and the Adafruit one.
Connections:
Arduino pin 10 -> CS,
pin 11 ->…
kamituel
- 141
- 4
2
votes
1 answer
Clamping 9-volt input to 8-volt?
Have a DFRobot Arduino Pro Mini.
Seems odd to me, but according to their specs the voltage regulator on board cannot handle more than 8-volt input. I can find no documentation, or have they answered me concerning what specific regulator they use on…
Gregory R. Pace
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- 8
2
votes
2 answers
Can we use Arduino mini in eagle to create new custom modal
I want to learn pcb design in Eagle/Fritzing. So i was thinking of using existing amazing Arduino mini/nano in eagle and create a custom pcb which has all arduino capability and plus some components like 7 segment/Bluetooth radio etc.
Can we do…
Rahul
- 137
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- 4
2
votes
1 answer
Diorama Controller Part 2 - Need More Outputs
For background see my original post. I've decided to not to use batteries and have it wired up with wall power.
I wish to use the Arduino Pro Mini 5V as the controller for my diorama project. I have five completed buildings which will all have…
EL MOJO
- 135
- 3
2
votes
0 answers
IR sensor not detecting light or dark sufaces
I wrote code for the vibrating motors to vibrate when an IR sensor detects a darker surface. I have 4 vibration motors for corresponding 4 IR sensors. My program is not able to read the values from the sensor. In the serial monitor the values that…
Rebekah
- 33
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2
votes
2 answers
I can't get code transferred to my Arduino Mini Pro
About 3 years ago Sparkfun had a sale on Arduino Minis, so I bought 6 of them (3 x 3.3 V @ 16 MHz and 3 x 5 V @16 MHz). I used two of them for separate projects (everything worked flawlessly) then stored the rest. Then last night I grabbed one of…
Tim
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2
votes
0 answers
Why the serial connection only work when Tx and Rx are shorted?
I have a Arduino Pro Mini 3.3V connected to a sim800l chip using a serial connection of 9600bps. When I connect the Arduino to the device, it seems I don't receive anything on the Arduino Rx pin.
I then connected a FTDI that listen the sim800l Tx…
Pat
- 121
- 3
2
votes
1 answer
powering RF on GPIO
I have been running a simple RF link between 2 arduini uno recently and everything went faily well. I am now trying a new project with an arduino mini pro (5V/16MHz) and the seeeduino RF link (@315MHz), and I see very odd results : when the…
Toluene
- 121
- 1
2
votes
2 answers
USB mini type B port on Arduino Uno
I bought today an Arduino Uno R3, and I'm looking forward to make it an HID device. I have seen many projects using a serial USB type B port. As I want to build a little gamepad, I would like to use the smaller USB mini type B port to achieve…
Glitched
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