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-3
votes
1answer
63 views

What design decisions must I make to select a suitable P-Channel MOSFET [on hold]

I need a PFET with a logic level gate to trigger a power connection to a hobby servo that pulls more current than my MCU pin can handle. The requirement is simple but I'm trying to understand how to ...
0
votes
0answers
13 views

ADXL345 GY-291 weird measures

currently I am trying to connect several ADXL345 to an Arduino Nano. I followed the Sparkfun Tutorial on how to do this (https://www.sparkfun.com/tutorials/240). Long story short, I connected two ...
0
votes
0answers
7 views

Can I connect and control 12 Arduino's over USB/serial to my laptop? [migrated]

I have 12 arduinos, each of them controlling some simple hardware peripherals. I want to interact with all of them over 1 USB connection to my laptop, where I have a python program communicating over ...
0
votes
2answers
70 views

Arduino project LCD displays gibberish when water pump is activated? [on hold]

Arduino project LCD displays fine when water pump connected to it off , when it gets activated LCD display shows some gibberish.This is aurduino activates water pump as value of humidity drops as in ...
0
votes
0answers
30 views

Using modulation/demodulation to read analog infrared signal

I try to build a rain sensor with my kid to add to our home made weather station (temperature, pressure, humidity, PM10 pollution), using IR transmitter/receiver to provide total reflection within a 5 ...
0
votes
2answers
66 views

Battery voltage drops when connected to a motor

I was recently working on a quadcopter so I bought a pair of coreless DC motor. My intention was to use an Arduino (DIP chip) to control the speed of the DC motor (rated 3.7 V) through a transistor. ...
-3
votes
3answers
162 views

How to make ammeter with arduino?

i'm interested to make ammeter from arduino. So, i have 70A/50mV shunt resistor and wiring it into arduino. From my schematic, Is this possible to meassure the current from 12V battery?If it possible ...
0
votes
0answers
35 views

Populating a list of connected ATMEGAs

I'm building some switchgear. Currently building a GUI to control an unknown number of PCBs based around the infamous ATMEGA328P, via a FT232R to the UART of the MCU. The current way of populating a ...
3
votes
4answers
7k views

avrdude error - stk500_paged_write() protocol error

I am using my Arduino Uno as a programmer to program my ATtiny85. I uploaded the ArduinoISP sketch to my Uno. I double checked my wiring, did some googling, but I still can't figure out why I get this ...
0
votes
5answers
112 views

Appropriate relay for water heater rated for 220VAC/1500W

I've created a complete hardware platform using a Raspberry Pi as master/controller, an Arduino nano and two RF24l01 transceivers, which should control some household electrical appliances. The ...
0
votes
1answer
35 views

How many DS18B20 temperature sensors can I connect to one bus arduino?

How many temperature sensors can I connect to one bus without losing accuracy.Can I use for example 50 sensors to one bus? Should I change the resistor when I connect too many sensors? Here is the ...
-2
votes
1answer
34 views

Input and output relation of ACS712 Hall effect current Sensor

ACS712 works by the use of the hall effect principle. When i went through the datasheet, i found out that the relation between input current and output voltage is varied largely ie. 66 mv/A to 185 mv/...
0
votes
0answers
31 views

Sensing a light object on a plane [on hold]

I'm attempting to complete a project involving a microcontroller and some sensors. I want to detect that a very light object (20 grams) is touching a place at four different points of contact. Some ...
1
vote
1answer
102 views

A question on PWM frequency of a DC motor

I'm planning to pwm-control four of the following motors by a single ArduinoUno: http://uk.rs-online.com/web/p/axial-fans/8179151/ For some reason the nearest pwm frequency I can set is 31kHz. The ...
0
votes
2answers
61 views

Arduino - Pulses get unstable when updating PWM duty-cycle

I'm trying to obtain stable pulse trains when adjusting the duty cycles wth an Arduino Uno board. In my actual project I need to use 4 adjustable PWM output pins at a fixed 25kHz frequency to control ...
0
votes
0answers
21 views

How to prevent Arduino Uno to change USB port [migrated]

I have an Arduino Uno connected through USB to my Ubuntu PC (one USB hub in between). I run a program that communicate through serial and use then the port ...
0
votes
0answers
23 views

How to communicate from Python to Arduino Softserial [migrated]

That is driving me nuts so I need your help. Master : PC with Ubuntu, a USB to serial converter (chipset CP2102), connected to Arduino Uno Pin 10, 11 and GND. The Arduino Uno is plugged in the same ...
3
votes
1answer
4k views

How to drive nixie tubes from Arduino

What would be the most practical (and preferably cheapest) way to drive 3-4 nixie tubes from an Arduino Uno? I am looking for a setup that, once I make it, will make setting the nixie tube is as easy ...
0
votes
2answers
108 views

Attiny85, reading analog values from PIN3, reports 654 on idle?

At first, I am not a hardware professional (starter) so be kind please. I try to reuse a DENON operation board of a DVD-player with 9 buttons with a Attiny85 Digispark clone connected to PIN3 (see ...
0
votes
0answers
29 views

Bluetooth Socket connection with HM-10 [migrated]

I'm using HM-10 4.0 Bluetooth module. I have written an android app. Upon starting the app it will discover nearby bluetooth devices. If it finds my HM-10 Bluetooth module then it pairs with HM-10 ...
3
votes
2answers
115 views

A visible light communication question concerning a preamble sequence

I have a question about preamble and preamble breaker. I am implementing a simple visible light communication using arduino. I have used a Manchester encoding scheme. While I have understood that a ...
0
votes
3answers
64 views

my arduino is working slowly in this function [closed]

my project is designing an ECU (engine control unit ) for a formuala car with my team , and I'm using arduino , arduino is connected to 6 sensors attached to the car such as o2 sensor map , this 6 ...
1
vote
2answers
118 views

Why does the accuracy of my camera drop when I start using no-ops as delays?

I'm using an Arduino Mega to run three TSL1401R-LF Linear Scan Cameras in parallel. I got everything working and the camera were giving me different results based on how much light was hitting them (i....
-1
votes
0answers
20 views

Mirroring display content of SSD1306 OLED using Adafruit library for Arduino [on hold]

I am using Adafruit Library for SSD1306 and wanted to mirror the content displayed to use the device as Heads Up Display (HUD). I tried searching online to see if I can tweak the library for ...
2
votes
4answers
418 views

solar power ESP8266 microprocessor circuit to turn off when low voltage

I intend to run an esp8266 microprocessor on only solar panels so it is on during the day and off/disabled during low light conditions that do not supply sufficient power. Is there a circuit that ...
-1
votes
1answer
41 views

Connecting Cathod Commond RGB Leds in parallel with arduino

I'm just starting with arduino, and want to light up 2 RGB leds (common cathode), and just think that the only thing I nedd was connecting them in parallel, no extra parts (my mistake), then I read ...
-1
votes
0answers
31 views

Is there an open source wlan router supporting dd-wrt [closed]

My router is not working anymore and I'have two options either to buy a new one, which is not very fancy or use my PCB designing skill and to make one by myself. Is there an open source wlan router ...
2
votes
3answers
19k views

Arduino USB not detected in Device Manager

I have an Arduino Uno version 2 which was working but now is not detected in Device Manager. The same cable works my AVRISP mk 11 fine and this device is detected. I can program the ATmega328 via ...
0
votes
3answers
124 views

Arduino 16x2 LCD weird symbols after relay-switch

I am using my arduino to automatically change water of my aquarium. The program runs fine, the pumps, heaters and valves are controlled by relays. When connected to my laptop, I can see via the serial ...
-3
votes
0answers
30 views

Arduino BLE Receiver [closed]

I'm trying to develop a solution for an outdoor fair with no access to electricity. I will give each attendant an ID with an Estimote Sticker. What I'm trying to do is add a device that costs less ...
-3
votes
1answer
75 views

What are all these pins on the DS1307 RTC for?

I recently ordered a DS1307 RTC from ebay. Before, I did some research and found out that you only need 4 pins for it: Vcc, GND, SDA, and SCL. The one I got has many other pins like DS, BAT, SQ(I read ...
-1
votes
3answers
391 views

PIR sensor always gives HIGH

This is my first time to use PIR (HC-SR501 ) . It's in repeat trigger model. But when I test the output of the PIR , it gives always HIGH . I rotate sensitivity adjustment and time delay adjustment ...
0
votes
2answers
61 views

Long range sensor readings in a star network with Arduino

I'm planning a project that requires me to have around a dozen temperature and humidity sensors placed around the house and the yard. These would connect to a central Arduino in the house that would ...
20
votes
6answers
63k views

What is the voltage range of a standard headphone jack from a phone?

I want to connect the output from the audio jack of an iPhone to an Arduino. What voltage range can I expect to see on the audio lines from the iPhone? I assume that turning the volume up on the ...
0
votes
2answers
148 views

What will increase output volume (dB) on a Piezo Transducer?

I need to achieve 110dB at 25khz from a Piezo Transducer. According to the datasheet, the resonant frequency of the Piezo is 25khz and at 10 vrms it will produce 110dB. I will be using an ...
-6
votes
0answers
26 views

How to connect an arduino with sim300 and a seperate gps module? [migrated]

i am trying to connect an arduino with sim300 and gps module to upload data directly into a database on my localhost using gprs of the sim inserted.I am not able to interface the seperate gps and gsm ...
1
vote
3answers
27k views

How to have an Arduino wait until it receives data over serial?

So I've wired up a little robot with a sound shield and some sensors. I'm trying to write a sketch that will let check the sensors. What I'd like for it to do is print out a little menu over serial, ...
-3
votes
0answers
18 views

Lm386 audio amplifier module microphone connection [closed]

How can I get the module to pick up the microphone that is connected to it? The brown wire is ground to battery, green wire is ground to microphone, yellow is audio in, orange is the battery in. ...
0
votes
0answers
37 views

Comparing PID_v1.h in Arduino to PID(z) in Simulink

I am trying to implement model-based controllers in Arduino. I have explored several control systems in Simulink and now I want to see if I can replicate those simulations in Arduino. For instance, ...
0
votes
2answers
31 views

QRE1113 breakout with IR LED control

I'm interested in the following IR sensor breakout board with the QRE1113: https://www.sparkfun.com/products/9454 However, I would like to control the LED (on/off, PWM if possible). Should I ...
-1
votes
0answers
24 views

Arduino communication via 2.4GHz band [closed]

I want to make my Arduino's communicate with my laptop,phone,and with each other.I want to use the 2.4GHz band because every device(PC,tablet,etc.)can connect to it,it's fast and it can travel a long ...
0
votes
1answer
59 views

Arduino solar panel watt meter values reading 0's

I've been building a Arduino Watt meter for the past few weeks for a solar panel, and have successfully measured voltage and current separately. However I need to know both to calculate watts but can'...
0
votes
1answer
62 views

How to connect a headphone jack to this lm386 [closed]

I would like to attach a headphone jack to this board but I'm a bit confused as to how since the jacks I find have 5 pins but this only has 2 places for the headphone cables. Thank you in advance ...
-1
votes
0answers
12 views

interface arduino with lcd to work as oscolliscope [closed]

in my project ... l get a sin wave from arduino due and i want to connect it with tft lcd work as an oscollicope to show my signal. so i want to ask ..do i need a shield for arduino ? ... what do i ...
0
votes
1answer
99 views

Best way to get 5v or 12v or 0v from arduino pin [closed]

Concerning the answer to this question explained in the link "Best way to get +5V or +12V or 0V from arduino pin" I am at very basic level of electronics because I am in first semester of Electronics ...
6
votes
1answer
3k views

Programming an ATmega1284p with Arduino IDE and internal RC Oscillator?

I'd like to program an ATmega1284p with my AVR Dragon and the Arduino IDE. So far I have installed mighty1284p (http://maniacbug.wordpress.com/2011/11/27/arduino-on-atmega1284p-4/), after writing my (...
1
vote
0answers
39 views

Arduino - External Power not working properly [migrated]

I am a newbie to Arduino and created my first project. The project is using a Sharp short range sensor and a 7 seg LED board (http://embedded-lab.com/blog/new-version-of-max7219-based-4-digit-serial-...
0
votes
0answers
27 views

Arduino Leonardo clone programming problem [migrated]

I have made my own Arduino Leonardo clone using the Atmega32u4 as per attached schematic. Board operates at 5V, 16MHz. Power rails are clean. I burned the Arduino bootloader onto the device as per ...
11
votes
1answer
984 views

Weird behavior of 'soundcard' oscilloscope

This is what I did I expected a nice square wave on my soundcard oscilloscope software but I'm getting this What is happening ?
-1
votes
2answers
109 views

Using an Arduino (If Needed) to Charge 18650 Battery [closed]

I am looking for a way to charge 18650 battery with an Arduino (If needed) as simple as possible. I have seen tutorials where you have to buy 10 diffident parts. I just want the simple (But wont ...