Arduino newsletter

Top new questions this week:

why does function affect my ISR?

I am currently running this piece of code: main.ino #include "speed_profile.h" void setup() { // put your setup code here, to run once: output_pin_setup(); cli(); timer1_setup(); sei(); ...

arduino-uno c++ debugging isr

asked by Lamda 4 votes answered by Scott Seidman 3 votes

How to keep accurate millis() while using ADC_sleep mode?

millis() uses timer0 (linked to CPU clock) to count time, but ADC_sleep mode stops the CPU clock, therefore millis() will drift (lag behind) after each ADC conversion performed in ADC_sleep mode. ...

time millis adc sleep

asked by OlafM 3 votes answered by jwpat7 1 vote

Male header pins on Arduino Uno

On my board, there are 12 (2 groups of 6, each group consistent of 3 rows of 2 pins) weird male header pins. What are these, and how would you use them?

arduino-uno pins isp

asked by Duncan Whyte 3 votes answered by sa_leinad 4 votes

write pwm with only 8 bit? (timer2)

i have a problem with the servo library. I need to read a ppm signal and create a pwm signal of each channel. The problem is that ppm has a higher resolution than pwm so i want to use the 16 bit ...

pwm timers

asked by betion 3 votes

is analogWrite() inferior to writing directly into registers

Im trying to control a DC motor's speed with my Arduino Mega analogWrite(), but it doesn't seem to function properly. The motor never completely slows down, just slows down a bit (which is still ...

arduino-mega motor

asked by Cynthia Owolabi 3 votes answered by canadiancyborg 0 votes

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 ...

i2c arduino-pro-mini

asked by canadiancyborg 3 votes answered by Gerben 2 votes

Problem building a smart shopping cart

I'm building a smart shopping cart with Arduino for my final year project. The cart is supposed to be able to follow its user while shopping. I don't know of many feasible indoor positioning systems ...

arduino-uno

asked by Cynthia Owolabi 3 votes answered by canadiancyborg 1 vote

Greatest hits from previous weeks:

Why does starting the serial monitor restart the sketch?

If I upload any sketch that sends serial data, I immediately see the TX/RX LEDs flash once the sketch is uploaded. If I then start the serial monitor, the sketch appears to restart. A bare minimum ...

serial arduino-ide

asked by Cybergibbons 20 votes answered by sachleen 23 votes

Arduino : What happens if I power the arduino with both the USB and external power voltage simultaneously?

I am a novice user of Arduino. I am not sure whether I can connect both USB and external supply through power adaptor to Arduino simultaneously. Would this burn the controller? Basically, I want to ...

arduino-uno power

asked by Jagat 25 votes answered by Ignacio Vazquez-Abrams 6 votes

Can you answer these?

I'm new here. Where to look for documentation for my specific board

sorry if this isn't the done thing. I have a little red space invader shaped board that has an arduino chip on the back from a conference. There is an LCD display and I've just got it to function ...

arduino-pro-micro

asked by Shmink 1 vote

Servo.attach method causing strange issue

I am using the L298N motor driver for a robotics project to control 4 motors. 2 in each input and output terminal. I have this connected to an arduino uno which is powered by about 7-8v from nimh ...

arduino-uno motor servo l298n

asked by Dan Morrison 3 votes

EthernetClient: HTML table isn't being fully populated

I have the following code below for an EthernetClient named client. It is supposed to print a 2 row, 9 column table. The headers are ID and Name and are the first cell in each row. The other columns ...

ethernet

asked by tpm900 1 vote