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1answer
15 views

High power led driver for COB leds

I bought some chinese COB 100W Led lamps from Ebay and I was wondering what would be the most efficient way to power them. Led specifications: 24vDC 4.2A I want to use 4 leds in total, so that makes ...
0
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4answers
55 views

Arduino Uno questions

Anyways cutting to the chase I am pretty good at C++ as I have been doing it for over 6 months pretty much 1-2 hours each day and I am looking for cool things to use my knowledge on ,I have heard of ...
0
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0answers
14 views

Communication between Arduinos using USB Host Shield [migrated]

I'm working on a project that needs to use USB to pass serial messages between Arduinos (I can't use I2C or SPI for a few reasons – I especially need USB's support for hot-swapping and address ...
0
votes
1answer
19 views

Connect arduino to COM pin of a NO NC button

I probably have a basic question but i'd like a confirmation on my solution. I have finished my arduino breadboard prototype which is using some basic momentary push buttons along with pull down ...
0
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1answer
39 views

Car window motor control output

I'm toying around with a car window, and used this tutorial to try and make it work: https://itp.nyu.edu/physcomp/labs/motors-and-transistors/dc-motor-control-using-an-h-bridge/ I've set it up almost ...
0
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1answer
39 views

What is this M01PTH I see referenced on schematics?

What is this part "M01PTH"? I'm interested in building this "BBQ Temp Controller" Arduino-based project here: http://hruska.us/tempmon/ One component involved is a 12v blower. In looking at the ...
0
votes
1answer
54 views

Is there an advantage in using 8-bit mode in 16x2 LCD displays?

Since almost all 16x2 LCD displays support 4-bit mode, and as it seems to be pretty efficient, is there a reason why they have 8-bit modes? I am using a JHD162A display with my Arduino Mega. Since the ...
1
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2answers
69 views

MIDI to Arduino with a 4N38 Optocoupler

I ordered a set of optocouplers the other day and was excited when they finally came in. Unfortunately, I've having a bit of trouble getting them to work. Simple on/off tasks work fine but when I ...
11
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5answers
609 views

PID algorithm: how to account for fast input value changes after a long delay

I am trying to implement a basic PID algorithm on an Arduino Leonardo to mix hot and cold tap water using servo-controlled valves. The goal is to hold the temperature as close to a setpoint as ...
1
vote
1answer
77 views

Software Serial alternative with AVR (Two Serial/UART ports in atmega328p)

Arduino pins can be used as UART using the library SoftwareSerial.h Is there any alternative ...
2
votes
1answer
57 views

How to program a microcontroller over another microcontroller?

I am currently working on a project that requires two separate microcontroller to work together, but since I am still working on the project I generally need to update their programs. I couldn't find ...
1
vote
2answers
37 views

Voltage Divider, increasing resistor value for solar tracker

I am working on a solar tracking device based on arduino and I am using LDR's (Light Dependent Resistors) as voltage dividers. The wiring is similar to this: The problem I am facing is that the ...
0
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0answers
33 views

How do I create GPIO outputs from circuit to connect to Arduino Micro

how do i design the GPIO outputs so i can connect it to two pins on my Arduino and get the readings. ie. if green didoe is on GPIO 1 = High, other wise Low if red diode is on GPIO 2 = High, ...
0
votes
0answers
11 views

XBee Packet Buffer

I have an Xbee Pro Series 2. One is set as the coordinator and one as an end device. If I manually send a packet containing a one byte payload from the coordinator to the end device, I get an ...
0
votes
1answer
60 views

Arduino PWM control MOSFET

I have a bit of a problem that in hoping someone can shed some light on. I have a 4 wire fan (from a power mac g5) and I found that the pinout is positive, negative, PWM and rpm output. It's a bit ...
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0answers
37 views

Problem with testing an atomic clock module with Arduino

I have a FUM DCF-U module with the AFET 77.5 - 10x60/70 antenna of the company HKW. I connect it with my Arduino for testing purposes. It needs 3.3V VDD and it uses RS232 for the communication. For ...
0
votes
0answers
24 views

Is it possible to use the DASH7 protocol in an arduino? [migrated]

I've been reading about the protocol DASH7 but can't find much documentation about it. There seems to be a protocol stack called OpenTag writen in C and I want to know if there is something familiar ...
0
votes
0answers
27 views

arduino I2C maximum number of writes per Transmisson [migrated]

Is there any limit on the number of Wire.write() commands consecutively in between the Wire.beginTransmission() command and the Wire.endTransmission() command for the Arduino Wire library?
0
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1answer
24 views

Current/Voltage sensing for wheelchair battery using arduino

I am working on a project that requires me to monitor the power consumption of wheelchairs across a spectrum of different activities. (electric wheelchairs batteries are 2x12V) To do that I am going ...
0
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0answers
22 views

Connecting a Random Ground Fixed the Circuit?

So I built an inverting Schmitt trigger with an op-amp with schematic shown below: The purpose of the circuit was to detect whether a mouse licks a feeding tube, and the feeding tube ended up being ...
1
vote
0answers
30 views

Creating a clock using Arduino [migrated]

I want to make a large clock, 16 inch x 7.5 inch, which will display dd Month yyyy. What would be the best way to do this? Does Arduino have a built in clock, and I'd just need logic to turn on/off ...
-3
votes
0answers
20 views

How can I make the Bluetooth work for Android and IOS systems? [on hold]

I'm working on a project with Arduino,and I'm connecting it with the smartphone through the Bluetooth,so what kind of Bluetooth should I use to make it pair with both Android and iphone devices ? or ...
0
votes
0answers
14 views

XBee Pro 900 RPSMA not detecting

I bought 2 XBee Pro 900 RPSMA from Sparkfun.One of them is detected by XCTU but same other one is not detected by XCTU. so I tried recover faultly one by seeing this video ...
0
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0answers
24 views

GPS Module SKG13BL not working properly with Arduino Uno. How to resolve?

I am working with GPS Module SKG13BL and Arduino UNO. I have made 4 such sets. 3 of them are working fine. I am getting the latitude and the longitude correctly. The code in all of them is same with ...
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votes
1answer
46 views

No internet in ethernet shield [on hold]

I am working on arduino uno R3 + ethernet shield to do a Home automation project. But due to proxy and authentication restrictions on my university network , arduino is not able to connnect to the ...
1
vote
1answer
61 views

Why is my SSD1306 OLED only displaying half of the screen area?

I am trying to get this display working with my arduino via i2c: http://www.buydisplay.com/default/0-49-inch-oled-display-module-64x32-pixel-ssd1306-i2c-white-on-black I have successfully initialized ...
2
votes
1answer
38 views

HC-SR04 ping sensor cutting out at ~3 meters

I have some HC-SR04 ultrasonic sensors that I purchased from eBay not long ago. I hooked one up to an Arduino and wrote a quick sketch to test them, and found that none of them work consistently. It ...
1
vote
1answer
49 views

Why does my AY-3-8910 sound so distorted?

I'm building a circuit driven by an Arduino UNO that controls a AY-3-8910 programmable sound generator. The AY has three pins ...
-2
votes
1answer
44 views

How to controlle a motor with arduino

I have 2 og those 12v motor and a 12v battery http://www.enigmaindustries.com/Motors/Bosch_EV_Warrior.htm I want to know what s the best solution to controle the motor with an arduino Uno. Is the ...
-1
votes
1answer
61 views

What knowledge and equipment do I need to build this device?

OK I am a Software Engineer dealing with both low level and C/C++/Java code with a Masters in Software Engineering but no knowledge of Electronic Engineering whatsoever. I wish to build a device that ...
1
vote
0answers
63 views

Voltage divider to measure battery voltage on Arduino [duplicate]

I am working on a 3V battery powered arduino project. I need to monitor the battery so that I could send a signal when battery is dying. At first it seemed tricky because the same voltage is being ...
0
votes
1answer
21 views

proximity probe (sensor ) / eddy current pre-conditioning circuit

my goal is to use Arduino with 2 proximity probe sensor to achieve some output like orbit plot for a shaft mounted on a bearing the system ...
0
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0answers
46 views

How can i trigger this watering timer manually

I have a automatic watering timer that I purchase from the internet. I'm attempting to hack it into something that I can either trigger from a micro-controller, or sense when the solenoid has been ...
0
votes
4answers
36 views

How to convert 10K Pot raw output ADC data to voltage and resistance from arduino uno?

I have a simple and basic question. I am using Arduino uno to read the output from a 10K potentiometer. I understand that Uno uses a 10 bit ADC, therefore it can display outputs from 0 as 0V to 1024 ...
0
votes
0answers
29 views

How to read data from a rotary encoder with ATmega328 [migrated]

I'm using a home made "bare bones" Arduino, made with the ATmega328, and I need to read angle data from a geared DC drill motor, turning at speeds between 0 and 450 RPM. This is so I can use it as ...
0
votes
0answers
6 views

arduino OR operator [migrated]

I have been trying OR conditional operator in a if condition statement in my arduino programme and the result is not expected. My programme: //three variables assigned to const int datatype as ...
0
votes
1answer
49 views

Arduino LED Cube 8x8x8 with a Led Driver (TLC5940NT )

Me and a group of friends need to make a college project and decided to do a LED cube that can graph mathematical functions. We do not know how to code very well, and are very new to Electrical ...
1
vote
1answer
55 views

How should I wire up ground when using an ATX power supply to power an Arduino and several LED strips which in return are controlled by the Arduino?

Forgive me if this seems like a basic question but I want to make sure I wire these things up correctly. Currently, I have several LED strips that I am controlling with an Arduino and they are ...
0
votes
0answers
20 views

Can't burn arduino bootloader to atmega8a with usbasp [migrated]

I want to burn the arduino bootloader with arduino IDE, but I cant get it done. And here is my circuit: I have marked the way I connect the ISP port and the chip. I choose Arduino NG/older as the ...
1
vote
2answers
58 views

Arduino analog interrupt LDR

I am using an LDR on an Arduino Pro Mini with an analog interrupt. The Arduino goes to deep sleep when there is no light or it's not busy: Sleepy::powerDown(); ...
0
votes
1answer
40 views

Solar Panel Charging with Arduino

I built a solar panel charge controller from instructables with an easy to read schematic and for some reason my battery charges up to a certain point and then loses charge again. That leads me to ask ...
0
votes
0answers
58 views

What kind of equipment would be required to detect lobsters entering a pot? [on hold]

I'm investigating creating a device to detect if (and ideally how many, although this seems much more difficult) there are lobsters in a trap. The trap would be between 20-100 feet of saltwater, and ...
2
votes
1answer
115 views

Current, Voltage, and Power Sensing for 115 V AC Circuits

I am trying to sense voltage, current, and power with an Arduino (Due) for monitoring and diagnostic applications. To get reasonably good input (better than Kill-A-Watt), I have designed an AC sensing ...
0
votes
1answer
70 views

For a 'customized' arduino consuming less energy making use of Attiny85 vs PCB Fabrication?

Currently I am working on a prototype project where I try to move a servo (6V) according to the level of light that is recognized by a photodiode making use of the ISR function. A torch light is used ...
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votes
2answers
66 views

Logic Level Converter only works reliably when multimeter attached

I have this logic level converter that only lets data flow when my multimeter is set to measure milliamps and the leads are placed across the high and low signal pins. On the low side I have an ...
0
votes
2answers
53 views

Alternatives to Arduino for controlling LED's and Audio files? [closed]

Simple Alternatives to Arduino Has anyone used these different boards? If so, what did you use them for and why? Which are appropriate for controlling LED's and playing audio files? I'm looking ...
1
vote
1answer
64 views

Eagle software: Different grounds in the same circuit

I'm designing an Arduino shield to manage the control signal that reaches 4 CCFL inverters. As part of the circuit design, I've decided to use optocouplers to isolate the Arduino's microcontroller ...
1
vote
3answers
76 views

Measure human voice for ambient noise level

I need to develop an ambient noise level to measure the loduness in an office. Sometimes during the day people raise their voice more than they should and a lot of confusion is created. So this device ...
0
votes
0answers
11 views

BLE mini read not working

I recently brought a ble mini and configured it correctly updated my firmware. I am using asus zenfone 5 and android version 4.4.2. I am trying to use the simple chat program. I am able to send data ...
-1
votes
0answers
22 views

H Bridge speed control

So I'm trying to modify the speed of a motor through use of an arduino and a H Bridge, but adding different ohm resistors to the lie between the external power and pin 8 of the bridge just doesn't ...