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0
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0answers
16 views

Arduino project: powering a driver and Arduino in parallel

I am working on a project that involves powering an arduino zero and a laser driver. The driver runs at 5V/3.0A and I'm using 9 pins on the arduino at 7mA per pin, so a total of 0.063A. I'm new to ...
2
votes
2answers
889 views

Creating an Arduino-based Gameboy cartridge?

First off, I am not sure if this question fits here, so sorry for any inconvenience, mods! I've looked over the internet, and I found this pretty little thing called nanoloop, and I've been wondering ...
0
votes
0answers
14 views

Atmega328P - SCK pin [migrated]

I am using Atmega328p with arduino bootloader in a project. There happens to be an LED connected on SCK pin. During Start (or restarts), the LED appears to flicker a couple of times (3 times to be ...
0
votes
0answers
68 views

Interfacing Energy Meter with Arduino using MODBUS RTU protocol

How do I interface Rish EM 1340 energy meter with Arduino Uno? The meter has MODBUS RTU protocol and RS485 communication port. I am using RS485 to TTL converter for connecting meter to arduino. I have ...
0
votes
0answers
23 views

Whenever i use my esp8266 wifi module my home wifi link gets disconnected even if i dont connect the module to it [on hold]

I am using a esp-8266 module to create a Rf-id based attendance system. Actually I need to connect the module to the internet via my home WiFi router to send the attendance data to a webpage. Whenever ...
0
votes
2answers
995 views

Arduino Row Column Scanning not working

I tried to follow this tutorial but the whole matrix is always lit and only one row and one column does not light. I am pretty sure I did the wiring correct; I only have slightly edited the code ...
-2
votes
3answers
71 views

Is there an IC that can shift-in, store and shift-out serial data [on hold]

I want to storing serial data from an Arduino, and make it available for a second Arduino to read. Is there an IC that can receive serial data, store it, and send it out when needed? One solution ...
-2
votes
0answers
19 views

Relay with Physical Switch like Zwave Relay Module…How? [on hold]

Hows its working either from existing wall outlet Physical switch or from zwave based controller relay triggering......Plz help let me understand this because I want implement in my wifi based relay ...
0
votes
1answer
106 views

Have Cell Phone Display Panel(s) been hacked to accept HDMI?

Cell Phone Displays are cheap and have high-resolution and touch sense, but use varied specialized inputs via ribbon cable. So, has the DIY community made any controllers to input HDMI? What about the ...
0
votes
1answer
20 views

How to create a network of multiple xbee s2 with python and arduino

I'm working on a wireless sensor network in which I have one coordinator router (API mode 2) connected to a Raspberry Pi 2, 5 or more routers in API mode 2 as well. Each router is connected to an ...
0
votes
0answers
21 views

Storing RSSI values from HM-10 [on hold]

I'm currently using an Arduino and BLE HM-10 module to detect beacons. I'm already detect the RSSI signal and the MAC address of the beacon using AT commands. I would like to know how can I store the ...
0
votes
1answer
58 views

How to measure the temperature of a fridge with arduino?

A want to make a system with arduino to measure the temperature of many fridges and send SMS if temperature is over limits. I am wondering how to measure digital temperature without putting wire ...
-7
votes
1answer
70 views

help me with 32-bit ADC [on hold]

I want to use 32-bit ADC, suggest me any uC if there is any otherwise any microprocessor...in short I have simply no idea how to start working with 32 bit ADC help me on that too
1
vote
4answers
81 views

Finding RPM of DC motor

How can we find the RPM of DC motor using the given voltage?. To be clear, I need to find out rpm of a motor using the pwm signal sent from Arduino Uno. In my case i'm using a BO motor, the link is ...
0
votes
0answers
25 views

Arduino input noise control

I have been working on a project to simulate a fire suppression system. Below is a brief theoretical picture of what the project looks like Anyhow, the system is set up into a box, and the system ...
0
votes
1answer
114 views

Copy nfc NXP MIFARE Classic [on hold]

I have got a NFC key to enter in my room and i want to make a copy of this key in case of loss. I read the nfc tag key with my nexus 5 with Broadcom BCM20793M NFC controller. The phone reads the tag ...
1
vote
6answers
28k views

Arduino serial.read to int

I am trying to read a serial string which comes through as "R0123" for example then I need the 0123 to be in an int. to send out through another method Here is my code it is not working the way that ...
0
votes
0answers
31 views

Arduino 433MHZ transmit + receive on the same board

I have an arduino nano with the popular cheap 433Mhz receiver + transmitter on 2 different pins: http://www.instructables.com/id/RF-315433-MHz-Transmitter-receiver-Module-and-Ardu/ I would like to ...
0
votes
2answers
90 views

How can i make a 3.3v ouput from 9v battery? [duplicate]

I'm a newbie in embeded system and basic electronics ,Yesterday i purchased a esp8266 wifi module from amazon along with ftdi usb driver i'm also have an Arduino uno, esp8266 require 3.3 v . Arduino ...
0
votes
1answer
29 views

Two power supplies for an Arduino Mega - How to handle Vin pin?

I'm using an Arduino Mega to drive 7 servos (only 3 shown in my schematic), and I'm having some problems with the power management. Worst case scenario, the servos will draw about 4 amps, so I got ...
2
votes
1answer
4k views

Do I need a resistor when controlling an ESC with an Arduino?

I am planning to connect one of my arduino's PWM pins to the input pin of an esc and the GND pin to the GND pin of the ESC, which in conjunction with the servo library should allow me to control the ...
0
votes
0answers
46 views

Led matrix 12x32 [on hold]

I need some help in building my summer project. I'm planning to build a 12x32 led matrix(384 individual LED's, Blue) AND PLACING IT ON A TABLE.. w/ an arduino mega 2560 with a power switch so that I ...
0
votes
2answers
54 views

How can I change temperature range of TMP36 from (-40 °C - 125 °C) to (10 °C - 40 °C)

I am designing a temperature controller system using TMP36 as a sensor and Arduino UNO as a microcontroller. I am using 3.3V with AREF pin. I am working in the range of 10-40 °C. How can I change the ...
0
votes
0answers
5 views

Send Photo with Arduino Uno [migrated]

I'm new at Arduino projects. I googled but I couldn't get quite answer. I've got: Arduino Uno R3 Clone 4 pin push button 3 color RGB LED Module HC06 Bluetooth-Serial Module Card Arduino PIC ...
-1
votes
0answers
28 views

Getting Digital representation as an output of an analog as input in Arduino uno. [on hold]

I am using Arduino uno to get ECG signal from analog pin A0. Now I have to convert the analog value to its digital representation and get those digital number in digital output pins. How to do that ...
3
votes
3answers
62 views

How to enable Output pin to high by default in Arduino Uno?

In Arduino Uno, I noticed that when I set a PIN to output, the default initial state is low. Is there a way to set the initial output state to high? The pinmode documentation supports only input, ...
-2
votes
0answers
54 views

Solar Powered Battery Charger (AA, AAA, 9v batteries) A unique situation… [on hold]

Alright I'll first start by saying... a person would think that after 5 weeks of research on this site and countless others that I would have figured an answer to my situation by now. So here is my ...
0
votes
1answer
33 views

Arrays and buttons in Arduino [on hold]

I am trying to write a simple program that will cycle threw an array using push buttons. My current version of the program uses if statements and print lines. My goal is to have contact information ...
0
votes
0answers
5 views

Esp 8266 doesn't replaying for AT commands [migrated]

I am working on esp8266 module with arduino uno board. This is my program. ...
2
votes
1answer
31k views

Arduino board not detected when connected via USB

I have an Arduino clone called the InduinoX. It works with my mother's laptops and I can program it, but in my other laptop it goes undetected. It's last uploaded program works when connected ...
-3
votes
1answer
67 views

H Bridge not working [on hold]

I've created an H-bridge for a dc motor that will be controlled by an arduino the bridge has one input and a not gate it has two state forward and backward thats the circuit: it doesn't work :/ How ...
3
votes
6answers
1k views

Draw a small amount (30mA, burst to 300mA) of DC (~5v) power from 2-wire wall switch?

My question: I'm installing an arduino behind a wall switch. The light switch only contains two wires. the hot/live wire and the wire going to the light fixture. There is no neutral in the wall ...
0
votes
2answers
88 views

Switching +12VDC by arduino

I am new to electronics, so please bear with me. I have next task to do: I have programmed Arudino Mega 2560 to provide some arbitrary digital signals on predefined pins. This is to provide some kind ...
0
votes
1answer
5k views

Using the ACS712 and Arduino to measure RMS Current (220v mains)

I bought the common board that is based on ACS712 . My objective is to measure the current (and if possible, also the voltage) of my Mains WITHOUT any additional circuitry . After doing a bit of ...
2
votes
0answers
22 views

What causes Arduino UNO to burn out with analog input of 4V and no power to board? [closed]

I have an arduino UNO R3 board and a Keyes SD card data logger shield operating on a 12Vdc wallwart supply that we are using to monitor battery voltage on a 24Vdc off-grid solar system. We collected ...
-7
votes
2answers
46 views

Single Line Binary Decoder

How would I implement a single line binary decoder. Table: Input Output1 Output2 0 1 0 1 0 1 It also looks as if a flip flop would ...
1
vote
2answers
49 views

Help choosing a relay for pump control

I'm building my first arduino project, and I could use some help building up the relay portion. My goal is to control a water pump that's running at 110V, 3/4hp, rated at 9A, and measured to run at ...
-5
votes
0answers
33 views

problem of Receiving digital data coming from laser using photodiode… [closed]

help me plz...... ok... i am trying to receive a byte(8 bit serial) of data using photodiode which are coming from laser .. in the receiver side i am using a photodiode and an arduino uno for the ...
0
votes
1answer
55 views

Controlling high voltage PWM [closed]

I want to use Arduino(or others) digital pins with PWM to get below outputs. Voltage 0-50V, Pulse amplitude: 0-100mA, Pulse width: 0-200us, Frequency: 0-1kHz I need your help and suggestions for ...
1
vote
1answer
67 views

Pull high in software

I was porting Arduino library ps/2 mouse to pic and I wondered why pull high works when declaring the pin as an input and then making it high and that worked for pic and Arduino alike, but when I ...
0
votes
2answers
59 views

LED MOSFET switching circuit

So here's my circuit for powering 4 LEDs with my arduino. Right now it seems to be working perfectly. I send HIGH to any of the pins and it lights the LED. I was wondering if I take in account the ...
0
votes
0answers
35 views

Time-Keeping With the SeeedStudios/52Pi Super-Capacitor Real-Time-Clock - Any Issues Seen?

I recently converted a SeeedStudios/52Pi super capacitor real-time-clock (RTC) module to battery operation, and the modified module has successfully weathered dozens of simulated power-outages (up to ...
0
votes
0answers
3 views

XBee S2 Arduino interfacing using Zigbee shield [migrated]

I am having troubles while using my xbee. I am trying to configure it in AT mode. My zigbee shield doesn't have a switch to control USB and XBee modes. Thus, XCTU doesn't sense the connected XBee and ...
0
votes
0answers
21 views

Connection between MDB Peripheral and Arduino

I'm working on making a custom vending machine controller using an Arduino as the master. The bill acceptor I'm using implements the MDB communication protocal, which is (I think) a variant of RS-485. ...
1
vote
2answers
57 views

Bricked atmega32 with fuse bits

I accidentally selected the wrong clock in atmel studio (8-12MHz RC Oscillator instead of 8MHz crystal) and I'm trying to figure out how I can un-brick it now. I have an arduino on hand and a friend ...
1
vote
2answers
76 views

Is a capacitive power supply safe?

I'm doing a home automation system which uses a RF transceiver(nRF24L01+) paired with an arduino to control the relays. Since these require low power DC to run I was researching on ac to dc when I ...
0
votes
1answer
33 views

Making a light switch timer?

I'd like to have a light switch that turns on for at most 1 hour. My idea is to put a USB charger (110AC -> 5DC) + arduino + relay inside the wall. When the switch is turned on, it will turn the ...
0
votes
0answers
37 views

Arduino Due SPI Voltage Levels

I am using the Arduino Due SPI library. Everything looks fine except the voltage level at MOSI is approx. 1.3 V and not close to VDD (3.3V) what I would expect. It seems that there is some pulldown ...
0
votes
2answers
38 views

How to Minimally Communicate with an ADS131E04 ADC via SPI

I have bought a few ADCs from http://www.ti.com/product/ADS131E04 and I cannot get hear from them via the SPI. I am putting the ADC in a TQFP socket and I connect the PWDN, RESET, SCLK, CS, DIN, and ...
0
votes
0answers
41 views

arduino fio MAX1555 burn

I am doing aproject using Arduino Fio. I have solder all the expensive components to the fio until i realise that the MAX1555 ( charging component) of the board burn. the fio is still working fine, ...