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1500 questions
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3 answers

Multiple Buttons on Single Analog Pin and Trigger Pin Arduino Uno

I've researched how to attach multiple buttons to a single analog input using a resistor network. Instructables has a good lesson on this: http://www.instructables.com/id/How-to-access-5-buttons-through-1-Arduino-input/?ALLSTEPS My requirement is…
hagope
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Arduino Uno 3: Stuck at 'uploading...' sketches

I was playing around with my Arduino Uno R3 board with Sublime Text 2 & 'Stino' as IDE I am not sure if it is my code is the problem or if I broke something... I pressed upload while another sketch didn't finish uploading, even the original Arduino…
robertgzr
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Is it possible to extend the reach of a PN532 NFC/RFID shield?

I am working off an Arduino Uno with an AdaFruit PN532 NFC/RFID shield. The goal is to have a shoe box, with a false bottom. Under that false bottom would be my prototype, which I hope will be able to detect any MIFARE tag that is in the box, above…
erik
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Maximum Delay time

I am designing a driver for a Bipolar stepper motor using Arduino Mega 2560 and DRV8825 Stepper driver. In my application, a stepper motor (Nema 24) will run for 5 minutes and stop for 2 minutes. I have doubts about is what is the maximum time an…
CNA
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Is the ShiftOut tutorial on the official Arduino website really wrong regarding the capacitor?

I'm talking about this tutorial "Serial to Parallel Shifting-Out with a 74HC595" from the official Arduino website. It provides the following schematic: I've read a couple of times now, that the placement of the capacitor is wrong: This is a well…
Liam
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Compatibility between shields

Despite that I am new to Arduino, I am tasked to invent a serious alarm system and I chose Arduino. I study electronics, but virtually I am a software programmer and C is my area of expertise. I ordered the parts I think I will need and the time is…
Edenia
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How to fix: Invalid conversion from 'const char*' to 'char*' [-fpermissive]

I'm trying to upload the code from here to work with an ESP8266. So I copy/pasted the code to the Arduino IDE and I get this error: C:\Program Files (x86)\Arduino\libraries\WiFi\src/WiFi.h:79:9: error: initializing argument 1 of 'int…
Physther
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Wi-Fi module 5 GHz

What is a Wi-Fi module for an Arduino that works on 5 GHz? The ESP8266 - doesn't support 5 GHz according to: Re: 802.11AC 5GHz Why can't ESP8266 operate in 5 GHz since 802.11N is supported my own experiments.
Hryhorii Liashenko
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Listen for specific frequency

I’m trying to build a custom baby monitor for my wife who is deaf. It needs to detect loud noises and listen for a specific series of tones from a feeding pump our daughter uses. It will then send a radio signal to the other room to trigger a bed…
Curtis Fuller
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How to pass variables to custom callback functions

I want to use the Ticker library of the ESP8266 Arduino core to (asynchronously) delay the switch of a pin to a desired state like below. I am not sure about the "here is" function definitions and I am having a hard time to find some documentation.…
milkpirate
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3 answers

Decoding 2.4G RF remote controller?

There is tons of information on how IR remote controls work and how to use an Arduino to decode those signals and use any IR remote to suit your project. But I couldn't find much info about 2.4G RF remotes. I want to control a string of addressable…
ahmadx87
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5 answers

PCA9685: how "unset" PWM signal?

I use my Arduino with Adafruit PCA9685 servo controller. To set PWM signals I use the provided library: https://github.com/adafruit/Adafruit-PWM-Servo-Driver-Library It allows easily set PMM signal and works good. But how can I "unset" PWM signal…
Sergey Kravchenko
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4
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ATTiny85 Interrupt id vs pin when programming with Arduino

I am using an Arduino Uno with the Arduino as ISP sketch to program an ATtiny85. I followed this tutorial to set up to program the ATtiny, and successfully got it to run Blink and an interrupt-free version of my program. I then added an interrupt…
Mar
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Arduino Due - creating an 8Mhz clock signal

I am attempting to interface a OV7670 camera to an arduino Due. (I am fairly new to this although have been programming for many years). I need to generate a clock signal for the camera at a minimum of 8Mhz - I realise using the pre-scalers I can…
Triumph Rider
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Avoid a Pro Micro waking up a PC?

I have an Arduino Pro Micro mimicking as a HID, connected to a PC. The PC BIOS is configured to wake from keyboard events - it is switched on by hitting a key on the regular keyboard. This is a wanted feature and should stay. Unfortunately, it also…
AnoE
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