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0
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3 views

Measuring Boltzmann constant using thermal noise

For my physics lab I have to come up with a way to measure Boltzmann constant using thermal noise. The circuit that I 'm going to use is something like the one in the figure below: Than I'm going ...
-1
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1answer
28 views

Quick start on Arduino for experienced embedded programmer?

I'd like catch up the Arduino concepts (programming & IDE). There are excellent online tutorials available for Ardunio but all of them which I saw are made for those who didn't have ...
0
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0answers
15 views

ENC28J60 connected to Arduino on SPI

I have an Arduino Uno, that has been connected using SPI to an RC522 rfid board and an ENC28J60 ethernet board. SS1 for ethernet is port 8, and SS2 for RC522 is port 10. I can use the RC522 without ...
0
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1answer
17 views

Ramps 1.4 stepper motor Slaving

So I am looking to run 2 stepper motors for x and y axis with a ramps 1.4 board, but since their are only one stepper motor driver per axis i was wondering how to accomplish this? (I'm thinking a ...
0
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2answers
68 views

What are the different ways to switch power using a microcontroller (Arduino, Raspberry Pi, BeagleBone, etc.) and what are the pros/cons for each?

I'm using an Arduino to control a 12v water pump for a self-watering plant wall. I'd also like to use the same power supply for both, and probably need surge protection of some kind to avoid spikes. I ...
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0answers
37 views

Arduino to arduino serial communication through serial1 port failed

I need to send array of data from one arduino mega to another arduino through serial1 port( pin 19, 20).. But I can't get correct data on receiver data.. Please someone help me.. Code. Sender. ...
-1
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0answers
19 views

Factory Reset a HM-10

I had programmed a HM-10 module to act as iBeacon with my Arduino Uno's serial monitor using the following steps: AT+RENEW Restores factory defaults AT+RESET Reboot HM-10 AT Wait for OK ...
-1
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0answers
45 views

Powering an always-on Arduino

I need help designing a circuit to power my Arduino. The Arduino has to always be on(or on as much as possible), and my plan is to use a solar panel and two 3.7v rechargeable batteries to power it. ...
0
votes
1answer
21 views

Replace inverter manual potentiometer with mcp41010

I have an 3 phase ac inverter that uses standard potentiometer for motor speed regulation. The speed reference voltage is 0-10v and i need to control it using arduino. In MCP41010 datasheet I ...
1
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1answer
42 views

MOSFET output I on Arduino

I am trying to power a pair of TEC (thermo-electric cooler) using Arduino. I came across this guide that is used to power one. Because I have two, I want to know if I can still use something such ...
-7
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0answers
41 views

Please Fix my issue [on hold]

I would like to build a hexacopter. I have looked many resources to do this. I couldn't understand the starting point.I have been researching on net since many days. What is the basic knowledge ...
2
votes
3answers
87 views

solar power ESP8266 microprocessor circuit to turn off when low voltage

I intend to run an esp8266 microprocessor on only solar panels so it is on during the day and off/disabled during low light conditions that do not supply sufficient power. Is there a circuit that ...
0
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0answers
24 views

Arduino Mega ADC error when using PWM

I am building a temperature controller, where I read 16 ADC inputs (thermocouple amplifiers), and at the same time I am using 6 PWM outputs (at 10 Hz). When I am only reading the ADC values, I have ...
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3answers
97 views

Optoisolator, did I connected it right? (Arduino Uno)

Here is my connection for optoisolator, 2 wires, yellow and red are for AC current. Other 3 in my arduino, orange pin 2, blue ground and red 5V power. And ...
0
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1answer
43 views

Arduino and STM8 I2C Communication

I want to I2C communication stm8s(slave) and arduino uno(master), but it does not work. Arduino Uno(master) code: ...
0
votes
2answers
108 views

How to test if zero crossing is working?

I used circuit like this: On led I get: 3.3 mA and 1.3V What is the best way to test if zero crossing works with arduino or multimetar?
0
votes
1answer
41 views

AC supply to digital output

I need to sample 8 power switches connected to 230 Volt supply. I want to record the status of these switch every 10 seconds and send to cloud for which I am using arduino with ethernet shield. For ...
-2
votes
1answer
57 views

Arduino does not receives response over RS-485

I am using arduino uno to communicate with my industrial drive. I am using juan bester library for RS485 communication. Now here's what's happening: When I open serial monitor in my arduino after ...
-1
votes
1answer
19 views

5v regulators and arduino [on hold]

If my arduino has a converter that I can plug a 9v battery into, with a regulator built into the board, do I need to wire a 5v regulator into a system with mult. servos or in something?
1
vote
1answer
62 views

Strange electrical noise from stepper motor

It's my first project using arduino. Simply trying to rotate three identical stepper motors, using three 293d h-bridges. Although it does work properly (meaning the motors do rotate as they should), ...
-1
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0answers
29 views

How to wire an LMD18200 and an arduino? [migrated]

Ive been working with a motor project for a while and i bought this H-bridge(LMD18200). I dont understand how im supposed to connect it to the arduino. Here is the datasheet for the lmd18200:
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votes
1answer
43 views

Interface RTC and Accelerometer to Arduino UNO board [on hold]

We are trying to interface RTC DS1307 & ACCELEROMETER ADXL345 on arduino UNO board. Both these requires analog pin A4 and A5 of arduino but at a time we are able to connect only one of the deive, ...
1
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3answers
59 views

How to measure servo potentiometer

What's a reliable method of getting a clean measurement of the potentiometer in a hobby servo? I've modified a servo for directly polling its position by soldering a wire onto its potentiometer's ...
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0answers
47 views

How to power an arduino pro mini (3.3V) using 8 AA (12V) batteries?

I know you need to use the RAW pins, however when using fresh AA batteries I've noticed I often get > 12V. Am I in danger of frying the board doing this?
3
votes
2answers
120 views

Mechanical Switch in parallel to the Micro Controller working in Sync

Here is the image for my requirement,want to operate Load Lamp of 230V AC with Mechanical Switch in parallel to Controller where one can 'ON' the Load Lamp from the Mechanical Switch and 'OFF' from ...
3
votes
1answer
49 views

Test circuit for EU1640BCH12T / R Water proof ultrasonic sensors with Arduino?

I have EU1640BCH12T/R waterproof ultrasonic sensors, which I have got from this link. These are standalone raw sensors without breakout board and not a module like HC-SR04. Being a new electronics ...
4
votes
2answers
106 views

Buck Converting Voltage, to Switch Original Voltage

I'm learning electronics, so I want to sanity check this approach in case I'm missing something. I have an arduino (at 5V) controlling power to a set of lights at 12V, via a mosfet. This is all fine, ...
-5
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2answers
42 views

M-Bus (Meter-Bus) Arduino / RPI [on hold]

Is there some one that have manage to connect to a M-Bus (Meter-Bus)? With a Arduino or RPI? Maybe a M-Bus to serial is the way to go?
1
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1answer
80 views

Using optocoupler with MOSFET for dimming a LED

I have a blue LED which I want to dim using an Arduino, an optocoupler and an N-MOSFET. For achieving this I assembled the circuit on a breadboard as shown in the pictures, using a YwRobot breadboard ...
0
votes
3answers
84 views

Using Super Capacitors with solar cells and batteries to help save my dogs

I am looking to make a dog feeding mechanism that will operate regardless of power outages. The main point of this query initially is to figure out how to work with the materials I have (or can get) ...
0
votes
1answer
46 views

My H-bridge can't control my 3v motor

I'm trying to control my 3v motor from my 5v arduino. For this i use : 5 volt power source from pc for the arduino L9110 H-bridge module 2 AA Battery as power source for the L9110 H-bridge Here ...
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2answers
69 views

Mosfet H-Bridge Design Question

I have a few questions regarding an H-Bridge design that I like. I am having a little hard time understanding some parts of it. So this is the design that I found online here. I changed the motor ...
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0answers
38 views

Understanding modbus library function for arduino

I have a device with which I want to communicate and read it's data. It's data starts at 3000H. I am making use of Juan Bester modbus library for arduino. Regarding the circuit, everything is sorted ...
0
votes
1answer
37 views

Wireless data transmission options for streaming video

I am in the initial stages of planning a project that involves the wireless transmission of data between either an Arduino or Raspberry Pi and a base computer/RPi. Data transmitted includes the state ...
0
votes
1answer
56 views

How to determine range of wifi module

I am starting to plan a project that involves either an Arduino or Raspberry Pi (haven't decided yet) connected to a number of sensors. The unit will be located outside, battery powered and will send ...
0
votes
0answers
21 views

5V servo motor temperature rated to 90C [closed]

I am using a Hitec HS-625 servo motor to actuate a throttle of an engine. The servo is located in a hot part of the engine compartment and thus has burnt out when it spent time above 60C. I am ...
0
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0answers
29 views

Interference from mains using photoresistor on power meter

My apologies if the question will be naive or answered already (I tried to search). I'm starting now with electronics (from a SW engineering background) trying to build up something with Arduinos and ...
0
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0answers
43 views

NRF24l01 as Active RFID?

I just need little advice. Thinking about Swimming Pool Lap Counter. It might sound silly, but for me it should be very convenient to have receiver with big LED display which shows number of passed ...
3
votes
5answers
208 views

Using MOSFET as switch

I am new here so I apologize in advance for any mistakes in the way I am going about this. I had a question regarding a project that I am working on. I am trying to use a MOSFET as a switch that I ...
0
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0answers
33 views

How is data being sent to this Dot Matrix LCD? Can I just read one of the pins on the board using SPI?

I'm good with programming but am getting better with electronics. Can you guys easily tell how data is being sent to my LCD? I think it's using SPI but am not sure. I built a music/video/network box ...
0
votes
1answer
29 views

Would having a DC-to-DC Step Up Converter Damage the L293D H-bridge IC behind it?

I recently purchased two L293D H-bridge Motor Controller from Adafruit (data sheet here), but after reading that the controller could only output a max of 600mA for a short time, I realized I had a ...
0
votes
1answer
66 views

Arduino analogread: neighbor pin noise on ADC even with big delay

I'm reading two analog input values (light sensors, with pull-down resistors) on an Arduino MEGA 2560. One pin is supposed to report the value of 0, while another pin is supposed to report a value of ...
0
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0answers
38 views

RN 42 to RN 52 communication

I am attempting to connect an RN 42 bluetooth device to an RN 52 device, and then the 52 to a cell phone. The RN 42 is planned on being used a wireless controller, having all capabilities of ...
-2
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2answers
97 views

Intercepting graphics card output?

I was wondering what it would take to intercept a PC's graphics card output or parts of it. First of all I'm wondering if you could even intercept the output without increasing the latency between the ...
-2
votes
0answers
76 views

Issue with MANUAL-AUTO logic [closed]

As per the circuit I would be able to control the circuit through the manual switch which is connected to the Digital Input of the controller where 5V DC is looped and other alternate command ...
0
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2answers
35 views

How to create a multiple active output decoder, not just one active output?

i have a project to controll lamp in cupboard. there are several button. okay, lets imagine there is 8 button. when i click 1st button its will turn on lamp 1, when i click button 2, lamp 2 is on. i ...
0
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0answers
22 views

arduino pro mini downlaoding? [migrated]

I purchased the arduino pro mini atmega328 and equipped it with Ftdi breakout board with USB, a battery charging board, Wireless transmitter and a wireless receiver. I'm assuming they can all be ...
1
vote
2answers
69 views

What does the waveform for a Digital Addressable LED Strip look like?

I want to use this Digital LED Strip but with my own controller (i.e. NOT a raspberry Pi). The link has sample code but I want to be able to understand clearly in terms of hardware waveforms what ...
0
votes
2answers
83 views

Output data from computer to light up LEDs

I'm a complete newbie at this, but the idea is to have a circuit board with, say, 10 LEDs, connected via USB to a computer running Linux. This will periodically (e.g. every second) send data to the ...
0
votes
2answers
60 views

multiplexing control signal on speaker cable

I need to put an alarm siren close to the location of one of my audio speakers. But I don't have a dedicated cable towards this siren. Because the alarm control unit is close to my speaker amplifier I ...