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0
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0answers
12 views

Olimex MOD-485-ISO and Arduino Mega2560

I am trying to use the MOD-485 ISO to communicate an Arduino Mega2560 with a PC as shown below: Both jumpers are on (z-b) and (y-a). For more info please see my post on the Olimex Arduino Forum: ...
1
vote
5answers
260 views

Can I use an op-amp to supply itself a negative voltage?

For my project, I am using an LM324. According to the datasheet, its power supply can either be +/- 16V or 0-32V (max). The output will range from -3V to +3V (or there abouts), so I realise I'm going ...
0
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0answers
23 views

What are Best Software/Hardware Tools for Cymatics Experiments [on hold]

While cymatics seems a curiosity to some, it seems to me that analog harmonics and resonant frequency patterns can affect amazing things in nature. That said, what tool kits are there for cymatical ...
0
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0answers
22 views

Input power needed to Adruino and 500rpm DC motor

I have an Arduino UNO, two DC motors of 5kg torque and 500rpm(l293D motor driver), two ultrasonic sensors, and a bluetooth. I powered the Arduino with USB cable from PC. Then a 12V battery connected ...
0
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3answers
56 views

How can I hook this 8x8 rgb led up to an arduino?

I've looked around for examples but I keep finding single color LEDs or in best case a two color LED but I have yet to see how to hook up a true 8x8 RGB LED matrix up to Arduino, is this even ...
3
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2answers
92 views

The Transistor Menace - Questions regarding an Arduino rgb LED project

I've been browsing this forum and the internet now for a couple of days and what I thought would be an easy side project turned into a (for me) quite complicated matter. I'm planning to build a mood ...
0
votes
1answer
57 views

Insufficient ground supply on my circuit? Ground capacitive foil

I'm playing with a wireless sensor device (with atmega, xbee, and Capacitive sensor (simple foil)) that works fine with the lab power supply but as soon as I try it with AA batteries stops working. ...
0
votes
1answer
36 views

24v power supply to 24v and a Arduino

I have a Power Supply of 24 volts and 2.5A. I need something like that: http://i.imgur.com/z4oJukD.png I need a power supply of 24V and almost 1500mA and another of around 8 volts and 500mA (to ...
0
votes
1answer
28 views

Arduino controlled boost converter

If I was to build a 12->65V boost converter using Texas's LM5002 regulator IC, would it be possible to tie an Arduino I/O pin directly to the EN pin to enable/disable the output, while keeping the 12V ...
0
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0answers
22 views

Implementation of PSK modulation/demodulation

I want to implement a BPSK modulation/demodulation using a microcontroller (Arduino Due). The carrier signal should be at 1-50 MHz and the information rate at 300 KHz. For the sender part I would ...
0
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0answers
27 views

External power source steered by arduino through transitors - voltage differences?

I'm trying to steer rows of leds through arduino and I came into some difficulties. My circuit is inspired by instructable: So I have something similar to this grid of resistors and transistors on ...
0
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0answers
19 views

Load capacitance for a microcontroller crystal?

I know there are lots of similar questions on here, but I've read many of them and am still a little confused. I'm a student making a board similar to the Arduino Pro Micro, using a Atmega32U4 ...
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3answers
61 views

Help with simple Arduino/Transistor/Solenoid circuit

I'm trying to use an Arduino+transistor to control a shutter (which I believe is a solenoid) at work. The shutter is normally connected to a power supply by two small wires (positive and negative) and ...
0
votes
1answer
69 views

Conductive magnet to read resistor value?

I want to know if I can hook-up a resistor to one part of a Magnet Snap (carried by SparkFun), then another magnet snap to analog-pin on Arduino and still be able to read resistance value? Is this ...
2
votes
1answer
32 views

H-Bridge Power Supply Erratic Behavior

Description: I have built a copper plating tank to plate circuit boards and am using a technique called Reverse Pulse Current plating to help aide in the copper plating process. What that involves is ...
1
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2answers
85 views

Arduino and resistors

So , hopefully this is my last question on this system it's about the connections: about the transistor, i want to use it like a switch, so i wanted to know how to determine the value of the ...
1
vote
0answers
36 views

How can I make pinMode calls faster? [migrated]

I'm trying to use 3 pins as capacitive pins along side the Mozzi. I had several attempts and so far the closest I had was using code from the ADCTouch library straight into the main code, but with ...
0
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0answers
115 views

Magnetic Levitation

I am new to electronics, and I want to do a project where I make a device that levitates an object with the use of an electromagnet, for learning purposes. Something like this is what I had in mind: ...
-5
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0answers
30 views

Does anyone know US based seller of HX 711 (24 bit ADC)? [on hold]

I need the HX 711 (24 bit ADC) board for building a weight scale. I am using a load cell (85 pound maximum, 5 grams divisions). All the seller of the HX 711 are based abroad mostly China. Shipping the ...
0
votes
2answers
53 views

Voltage regulator capacitor size

I want to use a LF33 voltage regulator to power a nRF24L01 module from a Arduino Pro Mini. I plan to power the Pro Mini with a 9V battery, then use it's 5V internal regulator to power the LF33 which ...
0
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1answer
63 views

Looking for a way to output 100-144 Analog Channels from Arduino

I've been searching for days and found 2 ways that could work, but not sure about implementation: Using shift registers like in: ...
-2
votes
1answer
45 views

Controlling hi&low voltage of a square wave [on hold]

I have an arduino that make a square wave between 0-3[V]. Now I need to control this wave with this requirements: Low voltage -5< Lo<5 [V]. High voltage[MAX] - 24[V] & bigger then Low ...
0
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0answers
5 views

how to remove Adafruit Pro Trinket bootloader flashing startup sequence [migrated]

From what I understand, the Pro Trinket has "Optiboot" which allows it to detect which boot loader you are trying to use, one for USB and one for FTDI. When it's in this "bootloader state" the red LED ...
0
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0answers
63 views

Will this circuit work as a AC-DC-AC rectifier-inverter?

I'm pretty sure I'm missing one or more things from this circuit and can't figure out what (new to this)! The end goal is that an alternating current will come in, run through the rectifier, then ...
0
votes
1answer
82 views

Method to cycle voltage?

In order to use a sensor (MQ-7: https://www.sparkfun.com/datasheets/Sensors/Biometric/MQ-7.pdf) i need to cycle between 5V and 1.4V. Any ideas on how to do this? Thank you!
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0answers
27 views

arduino brushless motor angular speed

I am using brushless DC motors for my project. I am controlling the motors via arduino through ESCs. I wanted to retrieve the rad/s speed of each motor. I use the arduino's Servo.h library to send ...
0
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0answers
15 views

How do I replace a burnt atmega328 with a new atmega328(bootloaded) in arduino? [migrated]

I have an arduino UNO with atmega 328 whose microcontroller got burnt. I bought a new atmega328. I have another working arduino with atmega8. I followed the instructions in ...
0
votes
1answer
40 views

Arduino water solar heater pump control

I am still a beginner, and I wanted to do this project which will be fairly easy if I follow the code and the pic, but there is something I don't understand about the relay connection: Why is there ...
-2
votes
0answers
66 views

How can I speed up reading [closed]

I am working on a project using an Arduino as a web server. Code: ...
1
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1answer
96 views

What signals can be probed with an oscilloscope on an Arduino board?

I got my hands on 35 MHz analog oscilloscope. I'm trying to learn how to use it. Is there something that can be seen with a scope like this on an Ardiuno board? Clock signal maybe? The board I'm ...
0
votes
0answers
25 views

Digital to Analog - Bluetooth from device screen to output old-fashioned Typewriter

I'm working on a hobby project converting an old-fashioned typewriter into an instantaneous printer(!) - basically, by allowing for a digital/virtual keyboard to be able to output to the typewriter ...
0
votes
2answers
45 views

Led Strip Heating Up

I have an LED strip with 7.2 Wattage/m and the strip is 3 meters long. The led strip has R,G,B,+12v inputs and I have connected a 12V DC 1000mA power supply to the +12v and attached transistors to ...
0
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0answers
8 views

Arduino Uno R3 not recognized by computer, TX and RX not blinking, neither are lit. Is it dead? [migrated]

I was trying to make my arduino uno r3 to work on my Linux machine (including the IDE), but it wouldn't. At first I thought it was a software problem. Added myself to different groups and did ...
0
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0answers
23 views

Connecting relay to arduino … ANOTHER ISSUE? [closed]

I know this matter has been discussed like thousand times, but my case here is a bit different. here it is ... i am commanding my arduino while it is running by a VB.NET application i am ...
0
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0answers
62 views

Controlling the luminosity (flickering) of 2 sets of 12V (in-parallel) lamps connected to external power source, via a PWM pin

I have been playing the last few days with the Arduino mic, and must say it does open a fascinating world. One very basic project I have been doing, with the help of various online tutorials, is to ...
0
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0answers
56 views

Turn Nano with CH340G(16 pin) chip into a USB to Serial converter (TX not working)

I am trying to convert a CH340G Bases Arduino Nano into a serial converter with 50% luck. It is able to receive data on the serial side but the USB to to serial bit is not sending data out. (Validated ...
0
votes
0answers
12 views

How are Arduino's OSH if Atmel AVR is proprietary? [migrated]

I keep reading how Arduinos are "open source", but my understanding of OSH is that all its components must be open source. Arduino uses an Atmel AVR CPU - but Googling this shows the Atmel is ...
0
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0answers
9 views

Replacing the Voltage regulator of a fried arduino [migrated]

I accidentally fried my Arduino. I found this Instructable. The symptoms are the same. The board not powering on connecting USB source and the over current protector was heating up. So i removed the ...
0
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0answers
5 views

Is this Bluetooth module cool for Arduino? [migrated]

I am making a basic project that will have 4 or 5 arduino nodes. Each arduino will have a bluetooth module attached. The thing I want is, I want to be able for each one of these arduinos to know the ...
0
votes
0answers
37 views

how to “implement” an arduiono prototype? [migrated]

I am starting with Arduinos, coming from the world of Linux (with the RPi as a bridge) and after having tested some setups I now wonder where to go next in implementation. What I am trying to ...
0
votes
1answer
59 views

Arduino ECG sputtering out totally random values

Hello StackExchange community, I have encountered a problem in my ECG/EKG design. I am trying to create the ECG using Arduino as a microcontroller to send/retrieve heart rate measurements via ...
0
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0answers
4 views

Arduino cannot communicate with PC after running servo [migrated]

I was messing around with my arduino uno r3 and servo today. The book I got said to run the servo through the arduino. Everything was fine. I started changing the code, and then things started to get ...
0
votes
0answers
40 views

How do we use the camera from Android phone in embedded project. [closed]

I have couple of old Android phones water damaged motherboard which kind of power up but fail to stay longer than 5mins. The GPS, Camera on them works flawless. I am thinking of removing the camera ...
-1
votes
3answers
279 views

Is it possible to exchange information between arduino and android phones easily using nrf24l01? [duplicate]

I need to send information from arduino to an android phone, having some app actively listening for radio communication from arduino. Using nrf24l01 is that possible? The best scenario would be ...
0
votes
2answers
60 views

uController SPI Over optoisolator

I would like to interface Arduino over SPI but need a way to decouple the system with an optoisolator. Any pointers in which optoisolator to get? Everything works on 5V. I've tried to connect with ...
0
votes
0answers
9 views

Program/Read 93LC46B with an Arduino with bit-banging [migrated]

I'm Tom. I'm pretty new to electronics and programming but I've been getting better. So, recently I bought a 93lC46B EEPROM from Element 14 (It was $0.28! Why not!). I've been doing some research and ...
1
vote
2answers
94 views

Arduino + MCP41010

I would like to control two 48V DC motors (500W) from electric scooter with my Arduino. I've bought two PWM controllers from eBay and they work excellent. Issue is that controllers have pot on them ...
0
votes
1answer
51 views

Can I use arduino to feed this circuit instead of an external power source?

I am following this tutorial to connect the output from my guitar with arduino. I'm wondering: is it possible not to use the batteries, and to feed the circuit with the 5V output pin provided by ...
0
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0answers
17 views

Arduino Serial Hex Values [migrated]

Apologies if I have missed a relevant post somewhere, but have search for days to try figure this out... I have written some C# code to send a Byte Array over Serial from my PC to an Arduino Nano ...
0
votes
2answers
47 views

using the Arduino internal reference 1.1v

So i want to measure a resistor of around 20 ohm in a voltage divider with an Arduino UNO R3. Is there any way on an arduino to use 1.1v instead of 5v? I want to do this to decrease the current, ...