Arduino newsletter

Top new questions this week:

Algorithms to reduce measurement error from analogue sensors

When reading analogue sensors - e.g. load cells, accelerometers - via a microcontroller's Analogue to Digital Converter, there are many sources of potential measurement error including: a) Warm-up ...

sensors adc algorithm

asked by Dave 2 votes answered by John Taylor 0 votes

Why does the PIN 13 LED of Uno R3 blink every time I upload some code?

I was driving a relay from Arduino Uno R3 Pin 13. I observed that every time I upload some code the led on the board designating pin 13 would blink. I'm curious why this is so. I understand that the ...

arduino-uno digital

asked by user4493465 2 votes answered by Nick Gammon 3 votes

Program an ATMega328P and use it without Arduino board

I'd like to use an ATMega328P for my project, I hope to do it without the arduino board. I know with the Arduino IDE and an Arduino board I can program the microcontroller. However, would it be ...

arduino-ide atmega328

asked by George 2 votes answered by Chris Stratton 2 votes

Get 25 kHz PWM on a 16 MHz Arduino

I am trying to output a 25 kHz software PWM on at least four pins simultaneously with variable duty cycles on each pin individualy. I've got all the actual PWM outputs via internal timers 2x8 ...

pwm

asked by Trevor Nichols 2 votes answered by Matt Young 5 votes

Arduino constant clock output

I am controlling an ADC with my Arduino Uno. I would like the clock of the ADC to be the same frequency of the Arduino. Is there any way that I can have a constant clock output from one of the Arduino ...

frequency oscillator-clock adc

asked by Liam F-A 2 votes answered by Nick Gammon 1 vote

How to read an RFID reader?

I want to connect an RFID reader to an Arduino board. The RFID reader has several wires attached, and the manual mentions them as follows: Red: VCC +12V Black: GND Green: D 0/RX/4R+ White: D ...

rfid

asked by MC Emperor 2 votes answered by Igor Stoppa 0 votes

Modify SSID and Passwords in WiFi sktechs

This is a question about modifying sketches other than through the IDE. I'm using an Arduino Uno r3 + Arduino WiFi Shield (not the 101). Up to now I've been using the IDE to manually change the ...

arduino-uno wifi shields sketch

asked by acpilot 1 vote answered by CharlieHanson 0 votes

Greatest hits from previous weeks:

How to check my Arduino board is working or dead?

When you have a board in your hand but you don't know is it working or not, how to verify if it's working or dead?

arduino-uno testing

asked by Hardik Thaker 8 votes answered by Hardik Thaker 9 votes

Control Speed of DC FAN Using Arduino PID Library

I want to make a circuit that control speed of DC fan Using Arduino PID Library to get thing at specific temperature. The circuit looks like this but can be changed, The dc fan motor connected to ...

arduino-uno arduino-mega motor pwm pid

asked by ANKIT JAIN 2 votes answered by Mathsman 100 0 votes

Can you answer these?

How to select a 0.1" header in Fritzing

Does Fritzing support the standard 0.1" break-away header? When I search for "header" in its parts database, I see several examples, and some even seem to reference 0.1 headers, but I can't actually ...

system-design

asked by Cerin 1 vote

Can I connect an output pin to an input pin to measure it's voltage on a single board?

So just bought an arduino Uno and I've been playing around with it. I want to connect one of the input pins to one of the PWM outputs and measure the output from there by sending it to my computer ...

pins pwm

asked by evan54 1 vote

How to get X Y Position from Joystick

I have VR2 Joystick and I want to hack it. What I think is that, to determine analog voltage of joystick outpin and to mimic this values in Arduino with AnalogWrite function. I tried measure analog ...

arduino-mega

asked by seda 1 vote