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1500 questions
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3 answers

How do I create a 9 bit number based on values from 9 digital inputs?

I have 9 pins that are inputs from 9 IR LEDs. I want to combine all their results into one 9 bit number. example: pin1 = high, pin2 = high, pin3 = high, pin4 = low, pin5 = high, pin6 = low, pin7 = low, pin8 = high, pin9 = low 9 bit number =…
user3216081
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Modbus Communication protocol for Arduino as Slave

I have an Arduino Uno board, with these components: rs-485 Modbus module shield Multiprotocol radio shield board for Arduino In addition I have a level sensor which reads either 1 when it is above water, and 0 when it is below. I need to be able…
lshas
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ESP 8266 does not respond at all

I have a ESP8266_01, and I wired up. It does not work for me. I have connected the ESP to an Arduino Uno. I am using a 5V pin from uP with a 3.3V regulator, and I have a voltage divider between RX(ESP) and TX(uP). And I am sure that the wiring is…
Chen
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Why were Atmel MCUs used for Arduino?

Atmel microcontrollers are not cheap compared to STM and Microchip. Why did Arduino select Atmel MCUs such as atmega328 and atmega2560 on their board out of so many alternatives?
user768421
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6 answers

Using / calibrating pH sensor module

I've bought this sensor module board to link to an Arduino nano: http://www.ebay.com/itm/For-Arduino-Liquid-PH-Value-Detection-detect-Sensor-Module-Monitoring-Controller/321764233326 I assumed the two screws were for calibration (low point + slope),…
Jasper
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3 answers

Humidity values returned by DHT22 sensors failing after some time

I've built a weather station using Arduino that measures temperature/humidity and pressure using an Adafruit 8266 HUZZAH. Temperature and Humidity are measured using a DHT22 sensor a ordered from AdaFruit. The project was completed about 4 months…
Stanley
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3 answers

esp8266 garbage out only when using SoftwareSerial

I'm trying to operate the esp8266. When I connect RX+TX pins to pins 1+2 on the Arduino, everything works fine. but when I'm trying to use software serial all hell breaks loose and the recieved data is garbadeged (It seems like everything is ok but…
Mercury
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Problems connecting reliably using HC-05 (as bluetooth master)

I currently try to connect an Arduino Micro/Leonardo/32u4 to an ELM327 Bluetooth dongle using a HC-05 Bluetooth shield from iTeadStudio. I also have similar problems trying to connect to a bluetooth dongle (with added serial connection) on my…
Thomas S.
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5
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3 answers

Decoding IR codes with IR sensor rather than IR receiver module

I'm looking for a library to decode RAW IR signals from an IR sensor (looks like a black LED, two legged) rather than an IR module (3 legged, rated for a particular frequency - such as 38kHz). Is there a library that supports IR sensors? A picture…
omribahumi
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2 answers

Basic Serial Transmission Protocol

I have a small piece of code here that I hope to run on Arduino. Basically what this code is doing is, it takes a nibble from the user, appends a startbit to it, and transmits the code through a transmitter module. The receiver end receives the bits…
Jonathan
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5
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1 answer

Arduino Analog Input Oscillating

I'm making a simple Infrared detector using a thermopile. I have a few extra capacitors than what that schematic says. I'm currently following another, but this is the gist. Schematic and Breadboard- I can add breadboard picture if needed. I don't…
Luke
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3 answers

Sending a value from one arduino to another

I wonder if it is possible to send a value from one arduino to another. Basically, I have one arduino measuring let's say weight, but I want to display that value using an lcd in another arduino. Is it possible to send the value to a pin using…
Camilo
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1 answer

Can a PC connect to an Arduino for serial communication without installing the entire dev kit?

I'd like to send a prototype board to a friend pre-programmed and wired. Ideally they should just need to plug in the USB and connect to it over a serial COM port. With another laptop I used for testing I had to install the full dev kit, sketch…
asawyer
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1 answer

How to make XBee module interrupt/wake arduino

What I am trying to do is, to have arduino in low power mode and waking up only when a packet is received and is available to be read from the buffer. A scenario : Zigbee XBee module is not receiving anything, arduino is asleep. Once this…
user1392
5
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2 answers

Using multiple laptop battery packs to power everything

I'm working on a medium sized robot project with multiple arduinos to control stuff. I've been planning on using a lead-acid battery pack, but then I was given 10 working and identical Asus laptop battery packs rated at 14.8 V 4400 mAh, and one old…
frodeborli
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