Be sure to use the Arduino Stack Exchange for questions that are more Arduino and less electronics.
-1
votes
0answers
14 views
Readings from Load Cell Combinator and HX711 connected to an Arduino Uno
I'm trying to get a reading from a set of four 3-wire load cells connected with a Sparkfun Load Cell Combinator (link removed) to a Sparkfun HX711 amplifier.
I've followed the Sparkfun hookup guide (...
0
votes
0answers
21 views
Arduino UNO sensor works fine when connected to laptop but gives problem when connected to external power supply [migrated]
I have encountered problem with Arduino UNO and water flow sensor. So here's situation:
I have connected a 12 V power supply from DC battery and then used 5 V regulator which output is used as input ...
2
votes
0answers
41 views
Interfacing dual supply op-amp with microcontroller
I have an dual op-amp amplifier circuit (LM833) to amplify a signal with a +-10V dual-supply rail from a 22V supply with a resistor voltage divider. The output is rectified into a 0-8V output, for ...
0
votes
0answers
18 views
Error burning bootloader to ATmega328 on breadboard [migrated]
I am following this (minimal configuration )- https://www.arduino.cc/en/Tutorial/ArduinoToBreadboard
And when I try to burn the bootloader I get this -
...
0
votes
1answer
35 views
is it safe to drive 8 ws2812b's from an arduino's 5v pin
I am doing some light testing with a small 8 pixel ws2812b strip. I'm wondering if there is any risk of damaging the arduino (nano) by driving the 8 pixels directly off the ...
1
vote
0answers
21 views
Bootloader on Atmega328p overwrites whenever it gets programmed [migrated]
I built my first custom circuit board with an Atmel ATMega328p-AU the tqfp-32 form factor. I connected xtal1 and xtal2 to an external 16mhz crystal to 22pf caps tied to ground. It seems to work great, ...
1
vote
3answers
72 views
How to drive low impedance load with arduino and transistor
I'm building a device which is powered with a small 3.7 v lipo battery. It is regulated down to 3.3 volts and powering an arduino mini. The arduino has to switch an inductive load on for about half a ...
0
votes
1answer
79 views
Can someone explain how this bias circuit works to output only positive voltages?
This is confusing me because there are two power sources in this circuit. (120 V AC and the 5V pin from the Arduino which is DC.) The output is measured at the point all the way to the right (Arduino ...
0
votes
0answers
29 views
Paralel PB Battery in a car as backup power for Arduino
Quick question. I want to run Arduino in my car and have a battery backup for it.
So when car is started - it should run on alternator power, and when stopped run on the backup battery.
I was looking ...
0
votes
0answers
46 views
How should I power my mains switching arduino project [on hold]
My question is similar to this one, but the specific circumstances are different.
I have built an arduino project which willbe used for timing and temp. regulation for various simple cooking ...
-1
votes
0answers
16 views
How to use a servo motor to automate my garage rolling shutter? [on hold]
I would like my garage rolling shutter to open on the press of a button/switch. I don't like my Dad bending to lift the shutter as it's little heavy. Please suggest what all components I would need to ...
0
votes
2answers
49 views
How to use two encoder sensors with an Arduino Uno?
I have the following problem: I must use two encoders to measure the speed of two DC motors at the same time, using just one Arduino Uno. But the Arduino only possess two interrupt pins, and I need ...
-2
votes
0answers
67 views
Need Help in circuit diagram of 8*8 reed switch matrix [migrated]
I am designing 8*8 reed switch matrix which will be connected to Arduino. I am using Arduino Duemilanove. I have completed the matrix portion but don't know how to connect and where to connect the ...
0
votes
0answers
40 views
Is the analogread function averaging the samples taken by the ADC? [migrated]
In many development boards the analog voltage data which is sampled by the ADC can be sent to the serial port. But the data speed I see on the serial port by HyperTerminal or Serial monitor is much ...
1
vote
2answers
47 views
Switching a 3V led series with an Arduino uno with 5V supply
just to verify my idea. I'd like to switch on and off a series of led supplied with 2 AA batteries with an Arduino uno.
I'd like to use an 2N3904 transistor.
The collector of the transistor will be ...
3
votes
1answer
38 views
Weird problem with ADXL345, Buzzer and Arduino
I've set up a Serial port via a Bluetooth module (HC05). I'm using a JavaFX app that I wrote to read the serial port, plot the acceleration values (via ADXL345) and write back to the serial port an ...
-6
votes
0answers
21 views
Single Phase Regulated Power Supply [on hold]
Design and construct a Single Phase Regulated Power Supply
Specification:
Vout = 0-20V
Imax = 2 A
Output voltage ripple = less than 1%
LCD display is required in order to show the regulated voltage ...
0
votes
0answers
27 views
General scheme for streaming data to Android phone via ESP8266? [on hold]
New to Stack Exchange. I hope to be helping others with their questions soon. For now, here's something I've really been struggling with getting a grasp on..
I'm designing an ECG (electrocardiogram) ...
1
vote
0answers
35 views
Can a motherboard be a simple circuit between arduino uno and a set of devices (ie: motors) [migrated]
Reason for question:
My son is working on a project to build a robot controlled by an arduino uno. This question is more about terminology than process, but since terms are very important at this ...
0
votes
0answers
25 views
What are some good options for high speed light detection (less response time along with sensitivity)?
I wanted to implement a one way wireless optical communication using arduino and LEDs but soon I had to choose sensors. LDRs are very slow and IR does not respond to visible light. My aim is to ...
5
votes
3answers
90 views
Microphone mute anti-pop circuit works but still picks up a little audio
I built a simple microphone mute circuit that appears to be pretty common. It mutes the mic without making a popping sound by shorting the connection through a capacitor.
It works pretty well, but if ...
1
vote
1answer
48 views
Coil switching for resonance with an arduino controlled TRIAC
I have a capacitive system which I need to power via resonnance using a coil. Resonance occurs at several frequencies, therefore I need a different coil for each frequency. So far I've manually ...
-3
votes
0answers
27 views
anti theft alarm by two bluetooth and buzzer
My project is an anti theft alarm with Arduino. I have two Bluetooth hco5 and hco6 and two arduinos and I already connected them successfully. But my Question is I want to add a buzzer and I don't ...
0
votes
0answers
7 views
Saving file OBEX FTP output [on hold]
I'm planning on pushing and pulling files from my phone using the BlueGigga WT 12 module using OBEX FTP and the iWRAP software they have. I want to save this data using a micro controller to a flash ...
-5
votes
0answers
34 views
how to control multiple 220v DC Power Supply Lines with arduino [closed]
I have 3 DC power supplies and a motor.
Now I want to feed the motor from these power supplies in scheduled way using arduino.
I am novice arduino user. I am looking for an efficient circuit diagram ...
0
votes
3answers
77 views
Filter opto-coupled mains signal for a digital input
I need to read an input of 220V and convert it in TTL logic 0-5V for my Arduino. If there's a presence of 220V at the input of my circuit, I read 0V in my Arduino, else I read 5V.
In parallel, I ...
0
votes
0answers
8 views
Arduino Due SAM3X ADC programmable input offset not working [migrated]
SAM3X8E Datasheet:
LINK
Section 43.6.9 Page 1327 clearly states that the SAM3X/A has a programmable offset for ADC input in Single-Ended mode and I believe that Atmel ASF library also has a function ...
0
votes
3answers
70 views
Latching relay - Remember state after power failure [on hold]
first off this is my second question here so pardon me for any blunders.
I am trying to use a relay to control appliances. My arduino will trigger the relay on/off. Additional requirement is in case ...
0
votes
0answers
16 views
Burning Arduino bootloader on a blank chip [migrated]
I have a blank ATMEGA328P from a factory and Arduino (the circuit itself, without a chip/bootloader). Normally I use avrdude with POLOLU PGM03A programmer using the following makefile:
...
1
vote
0answers
32 views
power arduino nano with usb external battery charger [duplicate]
I want to power my arduino nano with my phone external battery charger.
The problem is, when I connect them through a USB cable and turn on the battery charger, it works for serval seconds and then ...
0
votes
0answers
15 views
Arduino Mega, 5 Pin Servo Motor Reading
I was a good reader of this forum and now it is time to get in the game :d
I am building an interface to read the datas of a bus air conditioner control panel which is working at 24 V. I will use ...
-1
votes
0answers
19 views
Arduino Nano + ESP8266 and saving to EEPROM [migrated]
I am going to create a project with a friend, but I have some technical questions.
The Arduino Nano has an EEPROM capable of storing the known WiFi connections. Basically what I want is say "Arduino, ...
0
votes
2answers
38 views
Relay Connection 120V
I have a 16 channel SainsMart relay board and I'm controlling 120VAC on one side and DC on the other.
I tested with DC by wiring the source to the common pin, and the load on the NO pin.
I intend ...
0
votes
0answers
20 views
Arduino DUE deadlock problem, watchdog not working [migrated]
I am using Arduino DUE in my project. The project is massive (about 7000 lines of code in total, with massive schematic), so I decided not to post the whole code and schematic, except explain the ...
-1
votes
0answers
6 views
Introduce Zero Touch (with IR Module Array) to non-touch screen Interface with Windows [closed]
I have a non touch device and would like to introduce DIY touch to it. I was going through a number of possibilities and the concept of infrared touch and positioning has caught my attention.
Also ...
1
vote
1answer
97 views
Is this usage of an Op Amp valid? [closed]
My ultimate goal is to measure how many Amps are drained from my battery UPS with an Arduino chip. The circuit should be ready for up to 1kW loads creating currents of about 50A.
Consider the ...
0
votes
1answer
15 views
What resistor should I use for connecting seven segment to Arduino?
I am planning to use Arduino with a 4 digit 7 segment that uses TM1637 driver chip, which has 4 pins, and uses 2 pins for data with i2c protocl.
Here is the code and datasheets:
https://github.com/...
0
votes
1answer
48 views
Connecting hc-05(bluetooth) with clicker2 with STM32(ARM)
For a school project I a got HC-05 bluetooth module and MikroE Clicker2 with STM32 (ARM).
When I connect and use module with Arduino, 9600 BAUD rate and all other settings used with SoftwareSerial ...
0
votes
1answer
32 views
How do you figure out an efficient battery setup? [closed]
I have a project where I need an arduino uno and 4 dc motors to run on batteries. My first thought was that I'll just hook up 3 or 4 AAs to the arduino and a 9V to the motor drivers.
I googled to be ...
0
votes
0answers
57 views
Using HC05 Bluetooth SerialPort to stream music/voice via Arduino
I'm considering streaming music/voice over Bluetooth serial link (via HC05) from PC to Arduino. By doing this, there would be no need for a SD card. Here is the questions I have.
Any help is ...
-1
votes
1answer
47 views
How to Control High Voltage/Current like A/C air conditioner with Arduino?
I need to On/Off an air conditioner with arduino. I think Relays are not suitable to handling an A/C. So experts please help me.
0
votes
1answer
55 views
Do I need buffer amps and zeners for SPI pins in a tiny IC chip?
I am currently working on a project using the MMA9555L pedometer chip (from Freescale Semiconductor Inc.) and establishing communications through an SPI bus going into an Arduino Uno. Below is a ...
1
vote
0answers
14 views
Waking up async the Arduino while it's sleeping periodically [migrated]
I´m using LowPower.h and PinChangeInt.h libraries to put my Arduino into the sleep mode every 8 seconds and then it wakes up, ...
1
vote
2answers
97 views
Arduino Nano: How to decide voltage divider values that are safe for the input of the ADC [duplicate]
I am building a simple voltmeter circuit that needs to measure up to about 35 volts. Looking around the web, I am finding all sorts of suggestions for voltage divider values, like 1 Mohm / 10 Kohm, ...
0
votes
0answers
103 views
EMG amplifier using LM358
I came up with the following simple schematic in order to amplify the EMG signal and feed it to an arduino:
simulate this circuit – Schematic created using CircuitLab
The problem is that I ...
1
vote
1answer
42 views
Arduino: Did I damage analog joystick clicker by using analog instead of digital input?
I am using a thumb joystick for Arduino UNO, trying to work with it.
There are x and y values that I get with analog input <...
-4
votes
0answers
42 views
Arduino Micro schematic adjustments?
I have an arduino micro and I want to create a pcb that is basically the same thing as the arduino micro but I'm going to change some stuff up. I downloaded the eagle files for the schematic but I don'...
0
votes
0answers
16 views
OSX 10.11 Issue Connecting to ESP8266
I am trying to program an ESP8266 using OSX 10.11 (El Capitan).
I have tried to connect to it via FTDI, as well as via PL2303. In both cases, I can see the serial connection in terminal, and if I ...
-3
votes
0answers
26 views
Accuracy of hall effect sensor
Im planning on making my own esc with an arduino and some transistors. Im going to generate the sine waves with the pwm pins and maybe make a halve-bridge. The big problem Im facing is that I want 0....
0
votes
2answers
72 views
Is it good general practice to avoid powering components from the 5v pin on an arduino?
Most examples and tutorials have you power small components by connecting them to the 5v pin on the Arduino. As part of my learning process, I've messed up an arduino or two by not considering the ...
