Arduino newsletter

Top new questions this week:

Single #include pulls in all libraries

I am tracking down the memory usage of an Arduino-like project I am working on (not a real Arduino, but has same microcontroller and it uses the Arduino build environment, version 1.6.8). I have some ...

library memory-usage

asked by JvO 3 votes answered by jantje 1 vote

Why/when to use IoT publish/subscribe protocols rather then RESTful HTTP?

I am sending data (GPS coordinates) from Arduino once a minute with HTTP POST request to REST API (in OpenShift PaaS). Data is then stored to MySQL db. Would so called "IoT" publish/subscribe ...

arduino-uno arduino-mega power communication

asked by Gregor Stopar 3 votes answered by TisteAndii 0 votes

arduino + GSM/GPRS SIM 900A cannot able to read a message

Here I am using Arduino uno and GSM sim900A, I want to read sms from sim900A. But i am trying to read message, it is showing the empty values. I tried different methods, but no use. Here I have added ...

arduino-uno

asked by Prakash Ashokan 3 votes

Running sensor input for given time, stopping, then running seperate scheduled relay output

I've set up an Arduino Uno to run a pretty basic garden watering schedule, with the delay function. I've now built a solar thermal water heater with a pump and tried running it separately through a ...

temperature-sensor

asked by Brian O Callaghan 3 votes answered by RSM 0 votes

Cannot enter programming mode on Arduino Uno

I have an arduino uno that I've been programming with an avr dragon through Atmel Studio 7. I did two things in close proximity and I'm not entire sure which action is the culrpit. I tried using ...

avr

asked by Khaines0625 3 votes answered by Maxthon Chan 1 vote

Using an External ADC with Arduino

For my project I have to measure a signal of the order of few microvolts. As we know the least an Arduino can measure is ~5mV, due to its 10bit ADC and 5V reference voltage. A solution to this ...

adc

asked by ANUPAM BISHT 2 votes answered by David Cary 1 vote

Informations lost in a string

At first, I sorry if I make some English faults but I'm French. So, I'm making a connection between a client and an Arduino Uno. I receive all data that I need but when I send a response to my ...

arduino-uno ethernet c string

asked by electro 2 votes answered by electro 1 vote

Greatest hits from previous weeks:

Receiving SMS by Arduino GSM Shield and control the LED with the content of this SMS?

I am using Arduino GSM Shield receiving SMS from an Android app. And the content of this SMS will control a LED. If the content of this SMS is not "off", the LED will be on and the content will be ...

led gsm

asked by Zhu 3 votes answered by Dave Tweed 3 votes

Why is my LCD 16*2 is not displaying any characters, although all the wiring is correct?

Recently I have linked up a typical 16*2 LCD (Liquid Crystal Display) display to my Arduino Uno and have linked all the pins up. Here is my connection:(LCD pin first) 1=GND, 2=+5v, 4=11, 6=12, 11=5, ...

arduino-uno programming pins lcd

asked by Stratmoss 1 vote answered by PhillyNJ 4 votes

Can you answer these?

Problem in using COZIR W-100 with arduino

I was using the COZIR W-100 carbon dioxide sensor with an Arduino Mega 2560 with the example code from this site. But the measured value of carbon dioxide by sensor was 90 ppm in fresh air and that ...

arduino-mega sensors

asked by sunil 1 vote

Arduino clone changing its serial port on slight physical displacement, even during an ongoing serial communication

I'm using an Arduino clone for serial communication. However, as soon as I even touch the board, it resets, and the serial communication stops. When I view the serial port using the 'Tools' menu of ...

arduino-uno serial communication clones

asked by hello_hi 1 vote

Arduino receiving values over serial, but not responding

Now this is gonna make me cry. Yesterday night, my python script was working perfectly fine, while sending values over serial comm to my Arduino UNO. I have added the 10 microFarad capacitor between ...

arduino-uno serial python

asked by YaddyVirus 1 vote