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8 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 ...
0
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2answers
39 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 ...
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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 ...
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0answers
25 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 ...
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0answers
46 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 ...
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0answers
30 views

Arrays and buttons in Arduino [migrated]

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 ...
2
votes
3answers
61 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, ...
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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. ...
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1answer
61 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 ...
2
votes
0answers
21 views

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

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 ...
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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 ...
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2answers
84 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 ...
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0answers
33 views

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

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
49 views

Controlling high voltage PWM [on hold]

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
65 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 ...
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2answers
56 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
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0answers
29 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
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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 ...
1
vote
2answers
48 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 ...
0
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0answers
18 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 ...
0
votes
1answer
29 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
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0answers
36 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 ...
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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
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0answers
40 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, ...
1
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2answers
42 views

Permanent magnet DC motor earth wire

I have just inherited a piece of equipment that is powered by a 12V DC permanent magnet motor. My hope is to drive it using an Arduino PWM and a H-Bridge to manage the current requirements (7.3A ...
0
votes
2answers
37 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
2answers
55 views

Brushed Motor Voltage Drop

First of all, I'm fairly new to electronics. I've been working on my own version of a miniature hovercraft just like this one http://www.thingiverse.com/thing:68639. I'm using an arduino pro mini for ...
3
votes
1answer
73 views

Using an OP-AMP to obtain absolute value

I want to constantly log the voltage of waveform that is coming off a electromagnetic harvester into a SD card. I wish to use the ADC of an Arduino in conjunction with an SD card to do so. My problem ...
0
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0answers
18 views

arduino not in sync unique error [migrated]

when i try uploading to my arduino/genuino uno i get the following not in sync error with "unique" resp(resp=0X54) or (resp=0X81) please solve ...i have to submit my project tommorow...... error ...
1
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1answer
58 views

how to design power for arduino and servo

I'm designing a system where an arduino (3.3v) will run continuously, and occasionally turn a MG996R servo - this servo is pretty strong and can draw more than 2 amps. The servo runs fine off 4 AA ...
2
votes
1answer
58 views

Arduino's analog input pulling down voltage when off

I'm got a PCB manufactured, where a Arduino (Mega2560) is (via a 5V Buck converter) supplied by a 4S LiFePo4 battery which is secured by a custom BMS system. The system is measuring the voltage of the ...
0
votes
1answer
42 views

home automation with arduino, raspberry using externally powered relay board

I have a plan to put together small home automation system. For now I was just playing with smaller parts like single type of sensors at once etc... I would like to ask for opinion & check of my ...
0
votes
1answer
33 views

Arduino HC SR04 distance sensor still works even if not connected to gnd

I'm fairly new to electronics & arduino. When experimenting with the arduino wemos & the distance sensor HC SR04 I noticed that connecting the GND isn't necessary. It looks like the gnd is ...
0
votes
1answer
24 views

Generating FFT on data recived from 20Amp(ACS712) current sensor using arduino & processing IDE

Currently, for generating FFT on the data received from ACS712,i used the following method: first the data is sent to the Processing IDE from the sensor via arduino. the processing code converts the ...
0
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0answers
29 views

Communication between IC and microcontroller (Teensy 3.2) [migrated]

I am trying to use a rotary encoder with an integrated circuit to measure the position of a rotating shaft. I am then taking this data and writing to an SD card. The IC seems to be working correctly ...
3
votes
3answers
84 views

How to efficiently power wireless sensor node from a 9V battery?

Context I have recently set out to add some wireless features to my entry-level smoke detector. Problem In order to achieve that, I will be adding a custom pcb embedding an ATmega328P and a ...
0
votes
1answer
20 views

For 12X8 LED array with any 1 LED glowing at a time, should we charlieplex or use 74HC595n?

Apologies in advance for probably missing a lot of things. I'm pretty new to electronics. I'm building a 96(12X8) led (monochrome ultra bright, white) multiplexed array, driven by an Arduino nano. ...
-1
votes
2answers
79 views

Transistor to switch a motor not working - what's wrong?

I've been working on a project and cannot seem to get it right. I'm using an arduino to control a motor, and turning it on and off via a transistor. I had an issue with it not working, so I posted ...
1
vote
3answers
64 views

Thermocouple Op-Amp - Arduino

First of all, I know that this is not the best way to do this, even more so because I am using the LM358. I don t want extraordinary results. Now, on the matter of the problem. I have attached the ...
1
vote
1answer
74 views

How to reliably sample a sensor during the rotation of a wheel in a car?

I would like to sample the acceleration of the wheel axis (vertically and left-right) N times per rotation (for example once per spoke, but not necessarily). The data would be processed with Arduino. ...
-1
votes
0answers
22 views

How to port Arduino project using non-core parts of the arduino library to atmel studio? [migrated]

I'm trying to port an Arduino IDE project to Atmel Studio (I have Arduino IDE 1.6.8 and Atmel Studio 7). I've used the Atmel Studio wizard for importing an Arduino Sketch, which has imported my ...
1
vote
1answer
45 views

Monitoring of a System through an Arduino?

I am currently working on a project, where I will be doing the monitoring of a mechatronic system through the following measures : 6 x Motor temperature (Digital Signal) 6 x Motor Current (Analog ...
0
votes
0answers
5 views

Retrive value from thinkspeak using ESP8266 with Arduino setup [migrated]

I just started learning ESP8266 and in my first project I am successfully able to send data to thinkspeak.com using ESP8266 with following code: ...
0
votes
0answers
23 views

Arduino to send sms one time only when a button is pressed [migrated]

The LED_UPDATE() is called in my loop() function, I implemented it (tried anyways), to send sms as shown in the code such that only one sms is sent , because as the loop() keeps calling LED_UPDATE(), ...
0
votes
2answers
65 views

Is hobby relay adequate for air conditioner automation with microprocessor

I'd like to use a Beaglebone Black(3.3v Logic) plus a 3.3V to 5V logic level shifter(74HC125) to control an opto-isloated Songle Relay that has the following specs: Rated Resistive load: 10A ...
0
votes
1answer
52 views

PWM to DC converter with op amp - slowly but steadily rising output voltage

I assembled a circuit to convert a PWM signal generated by an Arduino to a DC voltage in the range 0..10 V. I use the 10k-10u RC filter to convert the PWM signal to DC voltage in the range 0..5 V, ...
0
votes
0answers
8 views

Atmega328 xbee and softaware serial libraries [migrated]

I use an atmega328 with fdti cable wired at rx/tx and i want to connect a zigbee s2 at diferrent pins. I have tried to use SoftwareSerial library but i would like to use the xbee library too. Is ...
0
votes
0answers
19 views

simultaneously communicate with multiple bluetooth modules using arduino Uno and HC-05

I want to make a project that in which my master HC-05 module can simultaneously communicate with its entire piconet(7 slave devices all HC-05). The problem is that i cant communicate with more then ...
1
vote
2answers
44 views

How to provide external power supply for 8 servo motors?

When ever I switch on the power supply there is not enough power supply to servo motors. Voltage across each servo motor is 1.5 Volts only. Should the circuit must be changed? Is there any better ...