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21 views

Can I guess 5/3-wire RS-232 pins from voltages?

Objective: interface to an HPLC pump via the RS-232 interface described in the manual. Communication protocol is well described. Pinout is not described at all. Can I guess the pinout based on ...
0
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1answer
38 views

C code for Xbee communication

I am using the following code to communicate with another arduino connected to an Xbee: ...
-1
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2answers
61 views

how to store data in arduino [on hold]

is there are an Arduino module that can store excel data which can be use for comparison the present data by sensor.i want to built a prototype that can use combination between 2 sensor which can ...
0
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0answers
37 views

Chinese CH340 Arduino Uno - Burning stand allone chip [migrated]

I followed regular tutorial and I was able to burn boot-loader on my standalone ATM328 chip, but because I'm using this CH340 UNO and example is with regular UNO, I can't just remove the chip from ...
1
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2answers
66 views

Battery powered Arduino on a breadboard

I am trying to run a low-power, battery powered Arduino on a breadboard. I followed these instructions exactly: https://www.openhomeautomation.net/arduino-battery/ I uploaded the "Blink" sketch to ...
0
votes
1answer
32 views

MCP2221 USB To UART Programmer

I am very new to the electrical design and had a very basic question. I am trying to program a Atmega328p using the MCP2221 interfacing chip. I picked this chip due to it being the only converter I ...
0
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2answers
50 views

Right wireless tech for 1.5Km with LOS but small-power availability at remote end?

I'm not very experienced in wireless space. I wish to communicate with an Arduino device stationed at the back of my property, roughly 1500 meters away. I have line of sight, although blowing trees ...
0
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0answers
42 views

VGAX library only allows 4 colors, library or hardware limitation? [migrated]

Im working with VGA DSUB-15 output, however VGAX only allows for 4 colors. Im using an arduino nano that uses an 8-bit atmel chip, and ive seen many 8-bit computers of which have a bit more than 4 ...
0
votes
4answers
135 views

Using as little pins as possible for multiple buttons

I'm using an Arduino Nano to make some sort of "console" and I'm currently designing the controller. However, I would like at least two of them with 6 buttons each. I have reserved 4 pins for the VGA ...
1
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0answers
40 views

Controlling digital potentiometer as feedback resistor in transimpedance amplifier

Main Idea: I have designed a transimpedance amplifier for current-to-voltage conversion application. To increase the dynamic range of the input current that can be measured, I have integrated the ...
0
votes
1answer
24 views

Arduino Uno, HC-06 Bluetooth & RGB LED Strip on the same 9V Power source

Hello! I am a complete amateur when it comes to electronics so forgive me for any misconceptions. I am trying to design a circuit that will power an RGB LED Strip (here depicted by a single RGB LED)...
1
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1answer
50 views

Connecting LED strip with long cable (10 metres)

I'm working on a Christmas light display that will feature addressable LED strips on my front lawn. My LED strips operate at 12V (using the UCS1903 chipsetUCS1903 chipset). The issue is, I need to ...
0
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1answer
38 views

Body interference in my analog multiplexer, maybe AC electromagnetism induction?

I just wired a CD74HC4067 analog/digital multiplexer to a matrix of leds. The multiplexer is wired to control the LEDs, and is connected to an arduino board, which is connected via USB to my macbook ...
-5
votes
0answers
31 views

is there a microcontroller module with dot matrix LED, and WiFi or Bluetooth? [on hold]

I want to remote control a dot matrix LED display to show short messages controlled by iPhone. Enter message at iPhone, shown at microcomputer's dot matrix display. I saw one a few days ago while ...
-5
votes
0answers
40 views

H bridge not working [on hold]

I'm new to breadboards so sorry if this is due to a stupid mistake. So I have attempted to build an h bridge (so that I can reverse the direction of a motor) but its not working so any help would be ...
0
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0answers
9 views

Xbee not activate on arduino micro [migrated]

I have 2 nodes: one is a PC+arduino mega+xbee the other one is arduino micro+xbee. The 2 xbees are communicating fine, I have tested this with 2 separate arduinos. My problem is that when the second ...
-4
votes
0answers
29 views

How to interface 8051 with ili9341?

I want to interface ili9341 ttft lcd. But there is no example of the code written in C. All examples are based on Arduino coding. Is there anyone who achieved this ?
1
vote
1answer
129 views

How to measure an 15 kV electric fence to 0-5 v analog input of a arduino?

Good day I am a mechanical engineering student who is dabbling in electronics right now and am having a little bit of trouble in one project The Project: Making a gsm enabled voltage meter for ...
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0answers
34 views

how to remote control LED matrix within nearby sealed environment

I want to display text on an LED matrix that is located within a sealed environment. I want to change the text by remote control, by using my iPhone. Power is available in the environment for ...
0
votes
2answers
48 views

Shield arduino for electrical interference

I have an Arduino UNO controlling two high voltage relays via a switch. It also reads out a third relay, which is controlled outside of the Arduino. My setup looks like this: With the following ...
0
votes
1answer
22 views

can not comiunicate through ask rf module [closed]

I wanted to send data by ardunio through dra886tx(board on the left side ) and receive by another ardunio through dra887rx ; i don't know whats the problem but nothing happen on the receiver board ...
1
vote
0answers
72 views

Using Arduino libraries with ARM based microcontroller [migrated]

A week ago I started messing with LoRa. I got my STM32L151 IM880A kit. Company that provided SX1272 LoRa modem chip (used in kit), provided some libraries, but lots of functionalities are still not ...
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0answers
21 views

Arduino Micro Cannot get Interrupt 6 work on PIN 7 [migrated]

After finding out about the situation with pin7 from this tutorial: https://forum.sparkfun.com/viewtopic.php?f=32&t=35847 ...
0
votes
1answer
31 views

Can't understand a variable in the formula used to determine CDTY to set duty cycle of PWM on cortex M3 (SAM3X8E)

I want to generate complementary PWM on an Arduino due. For that purpose I am programming the cortex M3 using the PWMC library. In order to set the duty cycle I have to set a value in CDTY channel ...
0
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0answers
95 views

Why does my pn2222a darlington pair work bettet than my tip120g with an arduino?

For the past few months I've been trying to figure out why I can't get the amperage I need out of a tip120g, if I understand correctly I should be able to control fans, relays, etc. from an arduino ...
0
votes
1answer
50 views

arduino pc communication

I wanted to ask what communication protocol arduino boards use exactly to communicate with pc? How can the serial monitor work on such high baud rates through usb? Will it be possible for using a ...
0
votes
1answer
80 views

Generation of sine waves within the audible range using a DAC

I am trying to generate up to 20 khz sine wave with the TLC5615 DAC but have only been able to obtain a maximum of 100 hz. I am using a 20 MHZ atmega328 MCU to transfer the required 16 bits (2 padding,...
0
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0answers
19 views

Arduino peizo detection circuit

I am working on a detection project using multiple Grove Piezo Vibration Sensors (http://www.seeedstudio.com/wiki/Grove_-_Piezo_Vibration_Sensor). What I want to do is take 4 of these sensors,...
0
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0answers
17 views

two way voice transmission using arduino or rasberry pi [migrated]

Can voice transmission be done by arduino or rasberry pi?I am trying to make a baby monitoring device.So I need to know can I transmit voice with arduino or rasberry pi.
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0answers
45 views

HUD type glasses [closed]

I'd like to build a helmet with transparant screen. The screen should display messages, distance,... a bit like a Google glass but Arduino (or similarly) driven. I've been Googling for transparant ...
0
votes
0answers
20 views

Arduino Read and write data from USB stick [migrated]

Hello I have an Arduino Uno and I salvaged a USB port from an old computer. The USB port has 4 pins on it and it accepts USB sticks. I was wondering if it is possible to connect it to my Arduino so my ...
0
votes
2answers
65 views

hx711 voltage measurements

wanted to use HX711 24-bit adc standalone to measure voltage range of 2mv - 20mv. Problem is: I cannot interpret the adc readings as it is in 2's compliment. What should i do in my code(code below) ...
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0answers
33 views

microcontroller suggestion [closed]

my requirement is 2 on/of buttons 3 buttons use for 3 steps of motor speed control High medium and low. and they also remote control please suggest a microcontroller which is suitable and low ...
1
vote
2answers
60 views

How does Touch Board work?

Some days ago I saw this device called Touch Board. It looks a bit like an Arduino (in fact it's based on Arduino). You can connect conductive materials to it, like aluminium foil. The board is able ...
0
votes
4answers
143 views

How to find area under the curve of a signal?

I am using a Wheatstone Bridge circuit with one pressure sensor. I want to find the area under the curve as the signal goes from 0 to maximum to 0 again. I have tried to use ADC of Arduino and then ...
0
votes
0answers
15 views

Arduino Robot motors disabled when analogInput is connected [migrated]

I have attached a solar panel to the Arduino Robot, connecting the - to the TK3 Input GND, and the + to the TK3 Input Analog Pin....
0
votes
1answer
29 views

Will an arduino output pin set low ground a pin on a DFPlayer module

I have a DFPlayer MP3 module I'm using for a small soundboard project. I have a button that grounds ADKEY1(Pin 12), which triggers playing the next MP3. I'm adding an Arduino into that mix that I want ...
0
votes
1answer
87 views

Driving ~3V hobby DC motors

Normally I've always used the L293D chip to drive my motors, but for a new project I am working on I will be using motors that I'll operate between 2.5 - 3.5V and I intend to power them using a single ...
0
votes
0answers
12 views

Hey how do I increase the resistance of a photoresistor with increase in light intensity using Arduino? [migrated]

I'm building a laser tripwire of sorts and instead of shutting u when the laser points on it (which is essential for my project) it beeps louder. Here's the code ...
0
votes
0answers
29 views

Trigger and Sawtooth Generator for Galvo Mirrors

I am currently searching for a way to control two galvo mirrors (voltage range of -10V to +10V) and triggering a camera to record images. For the two galvos I need to generate two different sawtooth ...
0
votes
0answers
6 views

Arduino pro mini power up problem [migrated]

i start to make an sim card reader datalogger based on arduino pro mini and micro sd card.The problem is that when i'm powering the arduino from an external power suply,5v, everything works fine but ...
2
votes
1answer
128 views

STM32F3 I2C communication with Arduino

I am trying to implement the Inter-Integrated Circuit (I2C) of STM32F3 Discovery Board to communicate with 2 slaves (arduino) in my project. However, I cannot send any data to arduino. Here is my ...
0
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0answers
66 views

Arduino Interface with I2C Flow Sensor

I have a Honeywell HAFUHT0050L4AXT I2C Flow Sensor that I want to read using an Arduino. Looking at the datasheet, I know that the I2C address is 0x49, and I have had a play with bits of code I've ...
0
votes
1answer
29 views

Relay to power ESC

I am want to create a switch that will power my microcontroller as well as the 2 ESCs that control two brushless motors. The ESCs run at 30A thought the motors only require 13A. I am thinking to ...
0
votes
0answers
10 views

Arduino + ultrasonic rangefinder behaving unexpectedly [migrated]

I'm using an HC-SR04 ultrasonic rangefinder to control the frequency at which an Arduino pin turns on and off, with the output going via a 1/4" jack plug into my computer's audio interface. (i.e. it's ...
0
votes
2answers
77 views

AT-Mega 2560 analog pins

I am trying to measure the temperature from four MCP9700AE temperature sensors (http://www.digikey.ca/product-detail/en/microchip-technology/MCP9700A-E-TO/MCP9700A-E-TO-ND/1212508) using an ATMega ...
3
votes
0answers
37 views

Problem Outputting 2.5 Khz Signal ATTiny85 with Digispark

I am relatively new working with the Digispark IDE and I am having some issues with something that should be really simple. I am trying to output a 2.5 kHz square wave signal, that will oscillate +/-...
0
votes
3answers
78 views

Is my ESP8266 faulty? Not turning on

I got an ESP-12Q ESP8266 module and I am trying to upload Arduino firmware on it. But I can't even get any response from the module at all. No LEDs anywhere are on, I don't even know if the thing is ...
0
votes
0answers
8 views

If - else statement in Arduino [migrated]

I'm starting to learn how to use Arduino and I try to make this code, which is just a simple if else statement, what I want to make is when the input is LOW, the led 1 is HIGH and led 2,3 is LOW. and ...
0
votes
0answers
17 views

How can I find a relative yaw value from an IMU (MPU-6050) based on which direction is currently up?

I'm having a hard time putting this question into words but basically I have an IMU (MPU-6050) and am able to get the data to stream using the i2cDev library. The IMU is in a box and I want to be ...