Be sure to use the Arduino Stack Exchange for questions that are more Arduino and less electronics.
2
votes
0answers
63 views
node voltage conflict
background: My goal is to use an Arduino with two proximity probe (sensors) to achieve some output.
It is worth mentioning that the output of the proximity probe has two components:
DC output that ...
2
votes
0answers
440 views
SPI SDHC Initialization Timing Problems
I Have a 16GB Wi-Fi SD HC Card from Transcend.
I try to initialize the card via SPI using an Arduino Uno, sending
CMD0, arg: 0 , CRC: 0x95
response:0xFF
but the expected response ...
2
votes
0answers
722 views
Driving multiple stepper motors
During the last days I've been working on driving multiple stepper motors (28BYJ-48 – 5V) with SparkCore and Stepper.h arduino library. I'm trying to drive some stepper motors, but without having to ...
2
votes
0answers
119 views
MCP23017s and arduino problems
I'm not native English speaker, so forgive me my bads.
Ok. Here's the deal.
In my Arduino UNO I need more outputs and inputs. I bought 3 MCP23017s. One of them for receive states from 8 ...
2
votes
0answers
190 views
Strange stepper motor behavior- moves too far
I have 3 CD drive stepper motors on a 9V 2A power supply, and they are being driven with EasyDrivers. I am using an Arduino with grbl to control the drivers. The current for the motors is at the ...
2
votes
0answers
485 views
noTone() and tone() are not implemented for the Arduino Due
As it turns out, noTone() and tone() are in the core arduino API, but seemingly not implemented for the Arduino Due. I was hoping to use tone() and ...
2
votes
0answers
144 views
Isolation between cells for battery charging & testing
I want to charge Lipo battery packs and possibly other chemistries too. Six cell packs for starters. But hope to handle more and less. Perhaps a lot more cells. For electric vehicles, skateboards, ...
2
votes
0answers
489 views
How calculate three phase kilowatt hour from time sampled data of voltage and current of each phase
My problem is I want to calculate three phase kilo watt hour from time sampled data of current and voltages.
My doubts
1) How can I calculate the kilowatt hour from time sampled data? Is it any ...
2
votes
0answers
1k views
ATTiny 85 + shift register + ir sensor
I had the ATtiny working with the shift register, but when I added the IR receiver to the code the shift register did not work as desired.
I have a shift register connected to 8 LEDs and controlled ...
2
votes
0answers
302 views
Ultrasonic range finder with single transducer
I would like to make an ultrasonic range finder with a single transducer. The reason for only one transducer is because I'm limited in the amount of space I have for what I'm sensing. I've purchased ...
2
votes
0answers
182 views
Arduino bot that can find a specific sound signal
I am working on my senior design project. It is an Arduino controlled robot. I am trying to figure out the best way to implement sound localization. It seems straight forward, at least two mic's, ...
1
vote
0answers
47 views
How to use L293D to spin HDD motor FAST?
Short version: I have a HDD motor I want to spin. I have the L293D chip and after hours of fiddling with code and timing, can only achieve 1200 RPM. How can I get more out of it?
Long version:
I have ...
1
vote
0answers
38 views
ATmega2560 freeze on start up
My arduino mega freezes on startup. I am powering it with an ATX power supply and the Arduino does nothing after power is applied, until I hit the reset button. I thought the issue was the slow ...
1
vote
0answers
78 views
Atmega328P is not responding in avrdude using usbasp
I have a cheap Chinese USBASP clone and it works fine with my ATtiny13A, but I always get this:
...
1
vote
0answers
41 views
Leaking power off of a coil
I am trying to make a wireless door opener by adding a small Arduino with a relay switch into our home phone. Unfortunately, that home phone operates without a power source, it has wires for audio and ...
1
vote
0answers
77 views
Automatic Power Input Selection - Home Automation (mini)-Project
I live in a developing country where electricity is not available 24/7; however, to compensate for the power outage, I have 2 other incoming power lines from third-party generators.
The thing is, ...
1
vote
0answers
88 views
Controlled supercapacitor charging with buck converter
I'm building a charging circuit for two supercaps (2.7V, 3000F each) in series. I've got a 12V supply and a buck converter rated to 15A, which I've set to provide 4.8V. I'm using balance resistors to ...
1
vote
0answers
47 views
arduino output pins collapsing voltage - is it dead?
After a while i came back to my arduino UNO R3, and attempted most simple program, that sets digital output pin high.
I measured voltage over that pin, and got 5 volts, but when I connected an LED, ...
1
vote
0answers
552 views
NTC Thermistor Resistance Calculation for circuit using Wheatstone bridge, Op Amp & Arduino
I'm trying to work out the formula for thermistor resistance when using Wheatstone bridge/op amp circuit as opposed to a voltage divider circuit. I know for a voltage divider the \$R_t\$ value is ...
1
vote
0answers
56 views
How do you measure an output designed for a moving coil meter, using an Arduino?
I have a Yaesu FT-857 Amateur Radio transceiver which has an output for an Analogue Moving Coil meter.
The radio will output a current varying between zero and 1 milliamp (0–1mA), depending on the ...
1
vote
0answers
519 views
Getting to work RFID-RC522 reader / writer with Teensy 3.1
I am trying to use the RFID-RC522 reader / writer together with a Teensy 3.1. I cannot get it to work. I always get the error:
MFRC522 Software Version: 0x0 (unknown)
WARNING: Communication ...
1
vote
0answers
87 views
Altera DE2 compatible sensors
I'm a beginner in the world of digital systems, I want to connect an ultrasonic range finder sensor to my Altera DE2 Board, and this sensor is Arduino and pic microcontroller compatible , can I ...
1
vote
0answers
290 views
Reduce analog reading noise on arduino
With refer to this question:
I got CTs connected to all analog pins on a Arduino Mega, connections for each pins are as mentioned here.
Readings were good indoors, +- 0.1A. However, when located ...
1
vote
0answers
119 views
Remote control of audio equipment over RS-232 with Arduino
These questions are following on from my previous question Reverse engineering old serial devices and cloning with Arduino about the monitoring of RS-232 traffic.
I had some good success and now have ...
1
vote
0answers
151 views
ATmega 1284P lockup or stuck in reset after lightening storm, then fully recovers. How to prevent it?
I have a custom Arduino based data collection system which has been running happily, reporting data over a cellular connection on solar power for a few months. After a lightening storm it stopped ...
1
vote
0answers
218 views
Designing circuit with Arduino and optocoupler: beginners problem
Firstly, I am a beginning hobbyist starting doing some electronics and this is my absolutely first attempt in trying to automate something. Here is my circuit (or what I intend):
I don't know if my ...
1
vote
0answers
207 views
L293D causing motors to move slowly
I'm modifying an RC car to use bluetooth. I use the L293D chip, and when I connect the motor to the chip, the car barely moves. If I connect the 9V battery directly to the motor, it moves the car ...
1
vote
0answers
141 views
Atmega328 NFC cannot wake
I'm trying to communicate my 328 with DFRobot's NFC Module a while now, but I cannot wake the card. Below is my code, where I use DF's instructions on how to make the card work. I write what card ...
1
vote
0answers
249 views
Half a meter long camera cable
I'm currently in a project using an image sensor but I'm a bit stuck at this moment.
My current design consist of an image sensor OV2640 connected directly to a SIM5218 which stores and sends ...
1
vote
0answers
413 views
Can Arduino UNO R3 act as both keyboard/mouse at same time?
I know that the UNO R3 can be flashed with FLIP to enumerate as a keyboard OR a mouse. I've successfully done this.
My question here is, are there any methods that allow it to perform like the ...
1
vote
0answers
206 views
Measuring a 2 cell 18650 battery from ATMega328P
I'm using an ATMega 328P (which will be running arduino code) as part of a project (a bicycle lighting system). It runs off of 2 Li-Ion cells, which both are step-up-regulated to 12V for the lighting, ...
1
vote
0answers
257 views
ATND gets Response when Xbee Router AT is connected to Computer, no response when on breadboard
I have a Xbee Series 2 in Coordinator AT which is connected to a computer, a Xbee Series 2 in Router AT which is connected to a breadboard and powered by Arduino's +3.3V and GND rails.
Coordinator ...
1
vote
0answers
3k views
L297 + L298 circuit not working
I have paired up L297 and L298 together to make a bipolar stepper driver.
My schematics are :
I have hooked up the step and direction pin number 4 and 5 respectively on Arduino.
I am using a 5V ...
1
vote
0answers
199 views
Alternative option for RAMPS Arduino for 3d printer?
there going through the reprep site , it can be said that using RAMPS or solinguo board i can make my 3d printer run but the problem is that they are very costly , moreover I want have a learning ...
1
vote
0answers
369 views
Picking the right sensor for a military style alarm
as a "squad engineer" of our airsoft team, I have been asked to create a device that will help us with our "capture the hill" tournaments.
As I mostly work with software, I have an hard time picking ...
1
vote
0answers
456 views
Connecting a geophone to Arduino
Simple question: I want to connect my geophone to an Arduino input. The geophone I have is actually output to a microphone jack and I can plug it directly into my computer. I'm pretty sure I can treat ...
1
vote
0answers
1k views
GSM sim900 cannot read SMS
I am using an Arduino UNO r3 with a sim900 module. I can send messages and make voice calls using https://github.com/jgarland79/GSM_Shield but I cannot read any SMS messages. The ...
1
vote
0answers
247 views
How do I wire a 9 pin serial connection to an Arduino?
My question is pretty straightforward. I've got a big old machine that has an RS-485 connection on the back and I've got a converter from RS-485 to 9 pin serial.
The device I'm connecting to sends ...
1
vote
0answers
229 views
Arduino to Serial Cable Encoding Error
I am trying to send data between an Arduino Uno and a Mac.
The Arduino Uno is running this simple sketch to print data to serial:
...
1
vote
0answers
168 views
Power coming from unknown source
Power coming from unknown source
Hi, I have a quite complex circuit with 5 DC/DC Converters all being powered by a 28V power supply and with a common ground. All DC/DC converters have a on/off ...
1
vote
0answers
4k views
L298 IC motor driver - how to wire and use correctly?
EDITED. I found that my supply of 3V was insufficient as there are voltage drops across the transistors. I replaced the 3V supply with 4.5V and the motor ran fine - although now my 3V motor has 2.5V ...
1
vote
0answers
598 views
Communicate through a VPN link using Arduino Uart WiFi Module
Following describes the configuration of the system and other details. The problem is mentioned after that. If the initial description is too much or not needed, please skip it.
I have a VPN ...
1
vote
0answers
210 views
ArduinoISP not responding
So I'm trying to upload sketches to an ATmega328 chip via my Arduino as an ISP. I've successfully been able to burn the bootloader, but when I try to upload sketches, I'm presented with this error.
...
1
vote
0answers
244 views
button input staying high?
I have a setup with 12 buttons. 10 of them connected to the arduino pins 0, 1, 6, 7, 8, 9 and analog 0, 1, 2, and 3 (these are all configured with pinMode as inputs in the setup-part of the sketch). ...
1
vote
0answers
432 views
Arduino leonardo keyboard emulation fail at boot
I'm using this code to use leonardo as keyboard:
...
1
vote
0answers
260 views
Maverick probe causes ardiuno to reset when touches grounded electrical item
I have a Maverick 732 probe connected to an Arduino for measuring temperature. The outer shield of the probe is connected to the ground pin on the Arduino, and the other wire is connected to an analog ...
1
vote
0answers
231 views
Issues with AVR atmega32a
I'm following this tutorial: http://pdp11.byethost12.com/AVR/ArduinoAsProgrammer.htm
I saw elsewhere, and I simply can't get it to work. I've connected the 10,11,12,13 pins exactly as shown in the ...
1
vote
0answers
143 views
Arduino “plug and play” Internet connection
I'd like to design an Arduino based device that provides an easy setup for connecting it to the Internet. When the Arduino is plugged into a user's PC vai USB, I'd like to automatically run an ...
1
vote
0answers
482 views
Connecting 2 Arduinos with Bluetooth
I have been looking on Google for a project that involves 2 Arduinos communicating with Bluetooth. The only examples I can find are with an Arduino to an Android phone.
Does anyone have links to let ...
1
vote
0answers
329 views
Reading a smoke alarm interconnect signal
My place has a few 120v AC powered smoke detectors (each with a 9v backup battery). They are "interconnected", meaning when one goes off, they all go off.
According to this page, they communicate by ...
