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Questions tagged [arduino]

Be sure to use the Arduino Stack Exchange for questions that are more Arduino and less electronics.

2
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0answers
79 views

PWM to synth control voltage improvements

Just built this little circuit to control my Moog Werkstatt. The plan is to make a MIDI-to-CV converter and add more CV outputs and of course a GATE output later. But before going further, I thought I'...
2
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0answers
48 views

Simplifying this circuit using optotriacs?

I'm currently trying to create an interface between my Arduino-compatible (NodeMCU) and my OpenTherm boiler. OpenTherm is a protocol used by some boilers (mainly in Europe) which allows for the ...
2
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0answers
138 views

BDM (Background Debug Mode) with Arduino

I'm trying to talk to a 68HC(9)12D60 (Motorola/Freescale/NXP) via BDM protocol. This chip is a 112-pin TQFP. On the PCB, there is a 6-pin header (which is not the standard BDM 2*3 pins header). The 6 ...
2
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0answers
33 views

Way of powering Arduino+GSM Modem+Cam off 5V powerbank

I'm trying to build a circuit, that would turn the Arduino on by a PIR sensor, take the picture by ArduCam, then transfer it onto a webserver. I got the SW site covered by now, so that is not a big ...
2
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0answers
262 views

A curious 433 MHz signal to decode

I bought a cheap set of remote controlled power sockets and I want to integrate them into my home automation system. So I got a 433 MHz receiver for 1€, connected it to my Arduino and tried to decode ...
2
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0answers
333 views

Prototyping a smart boxing glove: Where to find a “wearable” force sensor that can detect up to 2000 psi

I am working on prototyping a "smart" boxing glove that can track the movement (jabs, uppercuts etc.) and punch force. I am having a bit of trouble sourcing a pressure (force) sensor that is small ...
2
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0answers
438 views

What's necessary to properly decouple/filter a PWM-controlled fan from an Arduino?

I've got a small problem I could use some help with. I am using an Arduino to control a cooling system I am building for a DSLR. Primary goals are to use PWM and some pots to control TEC power, as ...
2
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0answers
1k 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 is: ...
2
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0answers
242 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
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0answers
362 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 ...
1
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0answers
28 views

HX711 Load cell providing constant large and negative reading

I'm currently working on a project that uses the HX711 load cell amplifier while connected to a series of strain gauges in a full bridge circuit. I'm using an Arduino Nano and have the CLK of the ...
1
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0answers
47 views

How to make a piezo speaker louder with 5V?

I have connected a tiny piezo pc speaker (https://sktechworks.ca/wp-content/uploads/2017/11/Speaker.jpg) to an arduino and used to tone command to play a simple melody in repeat (square wave only ...
1
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0answers
47 views

ATmega32 changing the supply voltage during runtime

I'm currently designing a circuit which involves having the ATmega32 change its own digital supply voltage (from 3.3V to 5V) by sending a high signal through one of its pins. What happens during the ...
1
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0answers
67 views

Control magnet through stainless steel wall

I'm a mechanical engineer enthusiastic about learning electrical engineering and I speak french so I thank you in advance for your comprehension and your help. I would like to be able to activate an ...
1
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0answers
48 views

AT commands not working while serial is working as expected for HM-10

I'm trying to use AT commands through the Arduino serial monitor, however, it seems like the HM-10 module just acts as if it is normal data being added to the custom characteristic value. I'm using ...
1
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0answers
72 views

Producing clean power with multiple switch mode power supplies

Thanks, I am new to using this site, I apologize for my vague post earlier. Here is a schematic I been working on. The project requirements are 5VDC, and 20VDC. The 5VDC is to power the ...
1
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0answers
31 views

Arduino Nano - Multiple 5v Power Sources

I am planning on building a small device that sits inline for a SNES controller to allow remapping the buttons. My initial idea is to use an Arduino Nano, but I'm a bit unsure about how best to do it. ...
1
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0answers
108 views

How to rotate a square on a TFT ILI9486 screen with Arduino

Problem Summary I have a “square” rotating on my 3.5 Inch TFT screen (ILI9486 driver) with dots/circles at each of its 4 corners. It is connected to an Arduino MEGA 2560 There are a few issues with ...
1
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0answers
31 views

Interface with wired alarm using Arduino or similar

My house is equipped with a wired alarm system that's missing the hardware controller board. Whats left is a number of sensors (NC) and the wiring to a central location. Cable lengths are anywhere ...
1
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0answers
43 views

mosfet as a switch on arduino pin and xbee explorer board 5v

I have looked at various examples of MOSFET switches but I am not knowledgeable enough to adapt what I see to what I would like.... I want to have a pin on my 5 volt Arduino Micro board turn on or off ...
1
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0answers
58 views

using ultrasonic sonar and mist maker together

I have made a cold steam bucket (ultrasonic mist maker). now i want to add automatic water level indication system for it using ultrasonic sonar module. i want to know if both mist maker ultrasonic ...
1
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0answers
77 views

Connecting door strike to relay

First of all I know there are many similar questions answered but I'm still a bit unsure on why my current set up doesn't work. I'm really outside my area of expertise so be kind. This is what I have:...
1
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0answers
57 views

Electro magnetic interference with Arduino Uno and a portable radio

I'm surprised when I'm working with Arduino Uno, by just sitting beside a portable radio, like when I was powered on both Arduino & Radio and when they are close to each other I got some noise ...
1
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0answers
43 views

Sharing power between components in a Arduino circut

I am trying to power both an ultrasound sensor (HC-05) and an infrared sensor (FC-51) from Arduino's 5V pin, connected in parallel. The circuit is very primitive. When connected separately, both ...
1
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0answers
123 views

Arduino Nano controlling led strip - cant power leds

I bought a arduino nano (ATmega328P Nano V3) and a led strip (sk6812 3535 4mm), to control the led strip with the arduino. Now i ran into problems with the power supply i guess. The idea came from ...
1
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0answers
29 views

Mosfet Based impulse voltage generator

enter image description here **Details- Mosfet_1 will turn on for 20ms and charge the capacitor C2 and after that, it will turn off. Then the Mosfet_2 will turn on for 3ms with 40kHz frequency and ...
1
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0answers
77 views

Can the idle state of MOSI cause issues?

I have an issue when communicating with an ADC over SPI. If I imitate the SPI protocol via bitbanging then I have no issues with communication; however, if I use the SPI hardware (I've tried Arduino ...
1
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0answers
73 views

(Arduino) When turning TIP120 on again, sometimes the slave flashes trigger without being told to. Why?

I have two mini slave flashes, that have no stand-by modes by themselves. So, even when charged and ready to flash, current keep flowing from the two AAA batteries each, and, if I forget to turn them ...
1
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0answers
89 views

Control variable external power supply with Arduino

I'm currently working on an air pollution controller project and I have a problem to control an external power supply to supply 5V, 1.5V or 0V to an MQ7 gas sensor. Using the direct PWM output to ...
1
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0answers
80 views

Indicator LEDs on Arduino current blocking

So I just inherited a project. I am designing a board for a mega32u4 smd microcontroller that has indicator leds on 8 input and output pins (4 digital (3pwm) and 4 analog) that light up green when a ...
1
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0answers
268 views

Custom Arduino powered board (CH340C) Serial Problem

I made this custom board that contains a complete arduino nano on it. I soldered every component with extreme care and already check all the connections and they all go according to the designed ...
1
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0answers
300 views

Can anyone help me get this running? (ILI9806E TFT on a teensy 3.5)

I am at one of those points where I just can't seem to see the forest for the trees. My previous experience with TFTs has been pretty much 'plug and play' using adafruit's breakout board kit and ...
1
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0answers
82 views

Servo sometimes freezes when used with another servo and MFRC522 RFID reader

I have looked, Googled and researched all over by now and I have not been able to find anyone experiencing a similar issue to mine, so I thought now would be the time to ask my own question on SE. ...
1
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0answers
154 views

Faulty H-Bridge Design L9110s

I am trying to integrate a dual h-bridge design in to my custom PCB (Arduino Nano with integrated motor driver) using the L9110s IC. However, I am struggling to get it working properly. The h-bridge ...
1
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0answers
65 views

Control servo with 4 wires with Blynk

im a beginner in coding and I was wondering if I could control an old servo using the Blynk app. I want to control the direction, so it can unroll the screen up and down. We opened the servo to look ...
1
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0answers
104 views

My BLDC motor is stuttering and I have no idea why

I'm driving 2 BLDC motors with two ESCs, the motors and the ESCs are powered by an external LiPo battery and the Arduino is powered via usb. The motors work with pulses between 1000 and 2000 ...
1
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0answers
190 views

NiMH Smart Charging Circuit with Load-Share for Autonomous Robot

a couple of questions/issues for creating a NiMH smart charging circuit with load-sharing. Background I have a functional autonomous robot based on different MCU including Arduinos and a Raspberry ...
1
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0answers
1k views

PID temperature controller with Arduino using a NTC thermistor and a Peltier Cell

I'm trying to control the temperature of a LED laser (which have a thermistor as temperature sensor and a Peltier Cell, both integrated with the laser) and what I'm implementing is a PID controller ...
1
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0answers
154 views

Audio op amps - what do they do to the audio I hear from the speaker?

I have a simple DC circuit which outputs audio from a ESP8266 attached via 2 wires and a NPN transistor to a simple speaker. It uses this library : https://github.com/earlephilhower/ESP8266Audio/ to ...
1
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0answers
55 views

Photocoupler to Latch Microcontroller Power Supply

I'm revising my custom arduino circuit which involves powering an atmega328p. I am using a 9V battery connected to a BS170 MOSFET. Without any voltage applied to the gate of my BS170, the battery is ...
1
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0answers
90 views

Shift Register with non sensical output

So I have two daisychained 74HC595 Shift Registers driving 16 low current LEDs, and the shift registers are wired to an Arduino Mega. Initially the ciruit worked perfectly, the test code scanned left ...
1
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0answers
391 views

Ultra low power arduino wireless sensor : care of battery discharge

I'm prototyping a ultra low power wireless sensor. To consume less I run a arduino mini pro at 1.8V at 8MHz with sleep 99% of time. The power comes from a LIR2032 coin and the 1.8V is generated from a ...
1
vote
0answers
442 views

Photodiode OP-AMP circuit for UV light radiation

The project: The aim is to be able to use the photodiode to detect plasma (radiation in the UV light spectrum). The photodiode suggested for this application is the BPX65 and I currently have access ...
1
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0answers
60 views

Measuring sensor noise on analog channels of common single board computers

Using the "MATLAB support package for Arduino" package, I am trying to characterise the analog input channels on an Arduino Uno board. The underlying assumption is that all sensors are inherently ...
1
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0answers
118 views

Using NPN transistors as switches for low-current, 3VDC infrared transmitter device

I'm currently trying to hack up an IR remote for electric holiday candles so that I can use Amazon Alexa or Google Home to turn them on or off. To do so, I need to trigger the switches on the hand-...
1
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0answers
98 views

Choice of the right stepper motor

I need to make a precise angular rotator for my directional antenna. The goal is to rotate the antenna at a precise angle. Arduino stepper motor library has functionalities to run a stepper motor for ...
1
vote
0answers
206 views

High current draw through DC-DC boost circuit

I currently have a simple circuit below which works fine but I am confused with the readings I am getting for when the Atmega1284P is put to sleep. When it is operating I get a current draw of around ...
1
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0answers
2k views

Light Strip with ESP8266 and ZigBee for HUE Bridge

I currently have an ESP8266, which controlls my WS2812b light strip. I want to add it to my current Hue setup(1 Bridge, 4 Lamps). I know that I'll need a ZigBee module of some sort. Are there any I ...
1
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0answers
308 views

30A Relay resets Atmega8A MCU as it engages. Are these PCB layouts to blame?

I am designing a PCB that uses an ATMega8A MCU to switch two high power relays (Songle SLA-12VDC-SL-A). I have used 2 separate approaches with the same disappointed result: the ATmega8A will reset as ...
1
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0answers
954 views

Problem with Arduino Pro Mini and RC522

I have a problem with a circuit and I couldn't figure it out why is this happening. This could be a silly mistake by me cause I'm not really an electronic expert. So after spending some days ...