Arduino newsletter

Top new questions this week:

How to stop uno from running program when powered on?

Does anyone know how to prevent the Uno from running the last program when it's powered on? Many times I have changed hardware and wiring without clearing the program first. Then when I power it on ...

arduino-uno

asked by perigalacticon 6 votes answered by Nick Gammon 8 votes

Return value of 0 if value is less than zero

Background: I am using an analog pressure sensor with a range from 0-100PSI returning voltage values .44v to 4.44v. It's open air (or 0 PSI) voltage on the signal pin is .47 volts. I have a function ...

programming sensors

asked by Jason Stewart 5 votes answered by jwpat7 5 votes

Works with gcc, not with Arduino. error: taking address of temporary array

I need to hard code 8 byte addresses into char arrays of length 8. This must be done many places in my code (in function scope), so I have tried to come up with a one-liner. The following works ...

c++ pointer array

asked by Mads Skjern 4 votes answered by Majenko 3 votes

Arduino serial hex decimal values code

I'm trying to send heximal values from arduino to PZEM-04 power module (it shows voltage, current and ect.) over serial communication in heximal format and get values in decimal format for further ...

serial uart

asked by Eimis 3 votes answered by Mikael Patel 3 votes

Arduino Yun Current Date & Time To Firebase

I am working on a sketch where the current time and date is posted to Firebase when motion is detected by a PIR motion sensor. Currently nothing is being posted to Firebase when I run the sketch also ...

arduino-yun

asked by Martin Hoban 3 votes

Why is the result of this product operation wrong?

I had a problem in a program where the result of product is not what it's supposed to be. For example: 775*775 gives 10801 instead of 6006025. To try to isolate and resolve the problem, I made a ...

arduino-uno

asked by BOUGIEngineering 3 votes answered by Majenko 4 votes

Breadboard for kids

I am interested in teaching young kids how to build arduino projects. I was thinking that using a breadboard may be difficult for them, as the holes are all very close together. It is easy to put the ...

hardware mechanical

asked by Alex K 3 votes answered by AMADANON Inc. 4 votes

Greatest hits from previous weeks:

Some dude named avr won't let me upload my program, aka "avrdude: stk500_getsync(): not in sync: resp=0x00"

I made an awesome program the other day, and I wanted to upload it to my Arduino. After clicking the upload button, some really mean dude named avr came along and stopped me. He told me: avrdude: ...

uploading avrdude

asked by The Guy with The Hat 36 votes answered by The Guy with The Hat 23 votes

nRF24L01+ (RF24) radio with Arduino Micro

I purchased several nRF24L01+ (RF24) radios to use with my Arduino Uno and Micro. Using the GettingStarted sketch and nRF24L01+ connected to my Uno, I get nice debugging info in my serial monitor. ...

rf arduino-pro-micro

asked by PhillyNJ 2 votes answered by user3028 1 vote