Arduino newsletter

Top new questions this week:

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 5 votes answered by jwpat7 2 votes

Comparing time_t values within an if statement

I am using an UNO with a RTC to control a light board. I'm using a simple control structure to decide when to turn things off and on. It's my understanding that a time_t value is just a number (number ...

arduino-uno timers time rtc

asked by Vinterwoo 3 votes answered by Edgar Bonet 2 votes

How to multiply strings?

I want to have a line like this Serial.println(count*"B"); So if count=6, it would print BBBBBB, etc. Is there anything like this for arduino?

string

asked by Mirror318 3 votes answered by canadiancyborg 1 vote

Formula for current through shift register

Hi I am programmer that just started learning electronics and Arduino. I built this simple circuit on Autodesk Circuits earlier. Originally I used 220 ohm resistors. Then when I ran the simulation ...

arduino-uno current resistor shift-register

asked by Heinrich Kruger 1 vote answered by Majenko 0 votes

LED and Switch Compolation Error Arduino 101

I'm getting an error on line 9 for some reason, (digitalWrite(Sender, HIGH);), and I just cant figure out why. My goal is to have two sets of flashing patterns, one for each switch state. I don't know ...

programming c++ led switch

asked by Canada Man 1 vote answered by sa_leinad 3 votes

AC meter By ADC timer interrupt from Nick Gammon

I want to read ADC from the pin A0 and A1. I have written in this code, however. I took this code came from Nick Gammon Thank You ...

interrupt atmega328 analogread adc analog-sampling

asked by Nightky Sin 1 vote answered by Nick Gammon 2 votes

Help managing the fallout from timer0 mode and prescaler change on ATMega2560 without modifying wiring.c

For a driving application I need the PWM mode to be phase correct and the prescaler to be 1. The issue is that the board I am working with has the load hooked up to a PWM pin reliant on timer0. The ...

pwm timers

asked by Nerbsie 1 vote answered by Edgar Bonet 0 votes

Greatest hits from previous weeks:

Arduino Pro Micro, get data out of Tx pin?

I have a Sparkfun Arduino Pro Micro with an ATmega32u4 on it and a Roving Networks RN32 Bluetooth Module Theoretically, I should be able to solder the Rx of the Bluetooth to the Tx on the arduino and ...

serial arduino-pro-micro

asked by user3320919 2 votes answered by Chris Stratton 10 votes

Unable to upload to Arduino Due using 1.6.8 of SAM tools; bossac.exe throwing an error

I can successfully see the Arudino Due when I plug it in, I can compile the code, but when I attempt to upload it to the board I get the following error: ...

arduino-due

asked by Tim 1 vote answered by Tim 2 votes