Be sure to use the Arduino Stack Exchange for questions that are more Arduino and less electronics.
-1
votes
1answer
89 views
Current sensing over a wide range
My project aims to measure the current of a photovoltaic module after applying a certain voltage across it.
That means applying a voltage from 0V to 38 V with 0.1V step and measure the corresponding ...
0
votes
0answers
23 views
Error in Arduino Library file [migrated]
I am working on a project which includes Arduino and a fingerprint scanner. It is completely based on embedded system. But then, I have downloaded a library for the fingerprint scanner. When I run the ...
0
votes
2answers
46 views
AVR sleep interrupt with keypad
I'd like to wake up my AVR whenever any button on the keypad is pressed. I am using Keypad.h library and simple 4x4 keypad made of buttons connected straight to AVR digital pins. Keypad itself works ...
2
votes
2answers
67 views
Can I create a multiplexed array of IR photodiodes?
I'd like to use an Arduino to read from a large number of IR photodiodes. I have seen this question: How to Use SFH235 IR Photodiode Correctly? and would like to use a similar technique to the circuit ...
0
votes
0answers
12 views
Why I cannot connect directly Arduino UNO and Xbee S2? [migrated]
I'm connecting Arduino UNO to Xbee S2 Zigbee module directly, and X-CTU cannot find Xbee module via arduino. i'm not using shield, it finds with non-arduino board connecter, but not by arduino UNO ...
0
votes
0answers
36 views
I need to control or power an LED strip with an Arduino Micro [on hold]
What I Have:
Arduino Micro, LED strip (12V, 60 W) and a 12V battery.
My Goal:
I would like to turn the LED strip on and off using the Arduino but I need a cheap and small component (if possible) ...
0
votes
0answers
36 views
Weird behaviour of DC servo motor controlled by arduino
Ok, so I have a dc servo motor powered at +-24 V and I am trying to control it with an arduino. I have an intermediate circuit on a PCB where I do the necessary voltage transformations in order to ...
0
votes
0answers
31 views
Device Discovery and distance measurement
The goal of my project is to discover devices with Wi-Fi or Bluetooth turned on (not connedcted anywhere) and measure the distance between those devices and my search devices. The search devices will ...
3
votes
1answer
93 views
Check for if I've picked the correct flyback and zener diodes for a solenoid valve driver
I want to use an arduino power driver shield which contains the RFP30N06LE MOSFET to drive the 12V version of a solenoid valve which has a power consumption of 2.0 Watts (so 167 mA current draw I ...
0
votes
1answer
60 views
Problem powering ESP8266 with two 1.5V AA cells
I was testing the deep sleep mode featured in the ESP8266.
I have a simple USB battery power supply associated with a 3.3V power regulator (https://www.adafruit.com/product/2165).
Everything is ...
0
votes
1answer
68 views
Arduino robot wire follower + how to position on wire
I'm designing my lawn mower robot, and I am in the perimeter stage. The electronic part is done, and works quite good, now comes the software.
I have 2 sensors on the front of the robot, left and ...
0
votes
1answer
77 views
74HC4051 multiplexing and voltage divider
I need a voltage source for an Arduino analogue input. I'm making a capacitive sensor with an NPN BC548B transistor. In the emitter, I connect the GND, in the collector, I connect the analog port of ...
-2
votes
0answers
44 views
Have Learned Arduino, where to next? [on hold]
For Starters: Im actually a QA at a Web Development company, so this is more or less a hobby of mine....but maybe something i'd like to look into in the future.
Anyways i've always been fascinated by ...
-3
votes
0answers
27 views
How many 5mm (common cathode) RGB LEDs can run on TLC5971 [on hold]
I'm working on an electronic project that can have somewhere around 20-30 units of 5mm common cathode RGB LED, and I found that TLC 5971 can help me drive them more easily using an arduino. Though I ...
0
votes
0answers
14 views
Programming a motor with an RGB [migrated]
Please see the comments section if confused.
I am trying to turn a motor on and off once per second, and when the motor is on, the RGB turns green. When the motor is off, the RGB is red. Everything is ...
0
votes
0answers
13 views
Programming an ATMEGA2560 using FTDI [migrated]
I want to know how exactly do I program (upload arduino sketches) an ATMEGA2560 which is boot loaded with an Arduino Bootloader using a FTDI programmer and an Arduino IDE, is there any ...
0
votes
1answer
60 views
How to wire a three-pronged LED on a breadboard? [closed]
This is for a digital electronics class project, we have what I believe are multi-colored LED's. The breadboard is attached to an arduino and basically I want to understand how an LED with three ...
0
votes
2answers
59 views
Can a 38kHz IR receiver module (TSOP38238) decode 870Hz pulse modulation IR?
I'm trying to reverse engineer my A/C remote controller IR.
I've decoded the IR signal as a NEC code with the PJRC IRremote library.
My attempt to retransmit the same code to A/C unit was ...
-1
votes
0answers
50 views
Wiring more sensors to same port on Arduino [closed]
I have an Adafruit Flora and I need to add a sensor and all 3.3V ports are taken.
What options do I have?
Thanks
This the ...
1
vote
1answer
52 views
Can a nRF24L01+ chip work alone? (i.e. without Arduino borad)
I have a prototype based on the ESP8266 wifi tranceiver as a standalone module, without any Arduino borad.
It works fine, but I have heard that the nRF24L01+ chip is less power consuming.
After ...
0
votes
0answers
6 views
Arduino: how can I stop while() when bluetooth send a data? [migrated]
I have learned Arduino for a month, and I want to bulid a car with 2 modes.
Remote and Auto, but Auto mode need to keep while(), so it can receives data from sensors. When I choose Auto mode via ...
-3
votes
0answers
55 views
Controlling the direction of a synchronous motor with an Arduino
I have just purchased a large electronic projector screen cheaply. The reason the price was so low is because it didn't come with a way to control the direction of the screen. I have an Arduino and ...
1
vote
2answers
63 views
Trying to read serial communication from smart meter with Arduino
First my compliments for this wonderful site. I'm hoping to find an answer to my problem. I've checked to find answers, however was not able to find it.
My background is somewhat technical, only with ...
1
vote
2answers
57 views
Best resistor value in series with LDR sensors
I am designing sensors array for the Line following Robot, based on LDRs Resistors and transmitter LEDs, the value of LDRs Resistors in series is changing with the position of the array on the black ...
0
votes
1answer
81 views
PWM (Pulse Width Modulation) vs DAC (Digital Analog Convertor)
I am working on a project where I take over the control of a Nintendo 3DS Touch Screen.
The touch screen is a 4 pin system.
I have it all wired up and working, however I cannot get the screen to ...
0
votes
0answers
21 views
Arduino coding of producing frequency [migrated]
Im new here. Anyone that could give a code or sample that would generate I wanted to use a frequency in range of 35k-43kHz. Please help me.
0
votes
0answers
15 views
Arduino bootloader burning error on atmega328p? [migrated]
I am designing a circuit in which I have Atmega328P MCU and other components. I need to burn the arduino bootloder into the MCU. So I used a ...
2
votes
0answers
52 views
How to make an Arduino USB programming circuit? [migrated]
I am designing a PCB in which I am using the MCU used in Arduino UNO which is Atmega328P and some other components as per my ...
-4
votes
1answer
42 views
Using TIP120 and common grounds [closed]
Good morning all!
Unsure if it's safe to use the approach on the left, connecting ground across the two power supplies rather than the right. I assume it's fundamentally the same thing but just want ...
1
vote
3answers
82 views
Water level sensors for water pump
I have a "pompe a eau" inside a well of 40 meters length, the water pump doesn't stop if there is no more water in the well and that causes damage to it. So I tought of using water level sensors just ...
0
votes
1answer
53 views
Photodiode to Arduino interface for high lux measurement
I'm trying to create a photodiode interface for my Arduino Uno board that can measure very high lux values. This is to be part of my lightcontroller project for monitoring high wattage lamps (~1000w). ...
0
votes
1answer
29 views
How to Compute bias Resistor for phototransistor Value?
I want to use this phototransistor in an Arduino project: https://www.kingbrightusa.com/images/catalog/spec/WP3DP3BT.pdf
I calculated the value of the phototransistor bias Resistor (R1) by the ...
0
votes
3answers
66 views
beginning with programming microcontrollers [closed]
I am a software developer (coming from java and javascript/web-app programming) and I'm very interessted programming microcontrollers like arduino or espruino. The problem is I have little to no ...
0
votes
0answers
5 views
Edit code on a Sainsmart uno r3 [migrated]
I have a Sainsmart Uno R3 and I can't seem to edit the code. I have it on the Device Manager but it keeps on saying: "Unknown device". Therefore I can't edit this code built in to the board.
My ...
1
vote
3answers
53 views
Which hardware to measure velocity via string/wire wheel attatchment?
This is a broad question but I want advice on what type of hardware I should look for to make a device that could measure the velocity of an object attached via a string/wire to some sort of rotary ...
0
votes
1answer
63 views
Waterproofing electronics by dipping into polyurethane or lacquer
I've been looking at and thinking about a few related topics...
http://arduino.stackexchange.com/questions/9163/using-arduino-for-industrial-process
Reliability of the Arduino platform for ...
1
vote
0answers
35 views
FM receiver circuit affects my PC [on hold]
I'm using an RDA5807M FM receiver PCB with my Arduino Uno. I've tested the circuit before to seek if i could scan for stations and it worked. When i decided to try listening to the audio (using my ...
1
vote
2answers
90 views
How can I make a very temporary “backup battery”?
I have a project where I am driving a car horn that is rated for 12V@8A. I have a pack of NiHM batteries rated at 9.6V (usually get's up to about 11.3V) total and their spec'ed out to 10A for 8 ...
-1
votes
0answers
39 views
atmega16 in Arduino Board [migrated]
I had a very common question. Why a additional MEGA used in most of the Arduino Boards. Arduino board Mega2560 also have a MEGA16U2 controller on board which i think is used for programming via USB. ...
0
votes
1answer
93 views
How to detect a number of frequencies with minimal circuitry?
I'm working on a project now where my goal is to be able to pick out selected frequencies (between 20Khz and 250Khz) from an input signal and transmit the strength of each of those frequencies to a ...
1
vote
0answers
77 views
How to write a literature review for a DIY-style electronics project? [migrated]
I am working on my BSc Electrical Engineering final-year project, and have been asked to do a literature review to include in the project report.
My project is an Arduino-based power strip which can ...
0
votes
0answers
43 views
Esp8266 Arduino smart connect [migrated]
Below i have an example of a temperature sensor.What i need to be able to set the username an password dynamically before connecting to my home router.It would ask me for the ssid and password for ...
0
votes
0answers
46 views
PID control of a motor using micro-controller with much lower operating voltage than rest of circuit
I am working on a project in which I need to use an Arduino Due (with an operating voltage of 3.3 V) to accomplish PID control of a turntable and get it to spin back and forth. The voltage used in ...
0
votes
2answers
39 views
Noisy Logic Level Converter for SD Card
I have designed a Arduino shield that is designed to be placed in the field and log data from a sensor which it then saves to an SD card. In order to log this data, I must convert 5v SPI to 3v3 of ...
0
votes
2answers
34 views
Piezo voltage through guitar vibration and Nyquist's theorem
I bought a piezo disk and intend to use it to determine the vibration frequency of a string instrument when a note is played.
https://www.sparkfun.com/products/10293
Can anyone explain how much ...
0
votes
1answer
39 views
LM358 circuit with Arduino micrcontroller ADC input
Need help use LM358 circuit with Arduino micrcontroller ADC input
I want to implement a LED fault compensation circuit. When a LED has failed, there will be an open circuit and no current will flow ...
-5
votes
0answers
79 views
Programming problem: bit not turning on [migrated]
I am making an 80 led clock. Almost done and everything works, the second, the minute, and the hours all work, but the last 7 leds for the day of week is not turning on.
this is the code for turning ...
1
vote
0answers
11 views
Arduino: Record value of the encoder only once at the instant my joystick reads 128 (when at rest) [migrated]
I'm working on a project where I need my arduino to detect the value of encoder at the instant the reading of the joystick change to 128. When the joystick is at rest, the reading is 128 which also ...
0
votes
0answers
38 views
Why does my LCD display random characters? [migrated]
I've been struggling with my LCD for hours, and after solving more different issues than I can remember, I'm out of ideas for this one.
My LCD is showing random characters, see the picture below (the ...
0
votes
0answers
9 views
Arduino freezing when LiquidCrystal library is used [migrated]
I have been struggling with a LCD for 6 hours straight - I've had many problems including random characters showing up, and this time (not quite sure what changed, I tried so many things) as soon as I ...
