Questions tagged [arduino]

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25 views

What's cheapest microcontroller to power video clips on 5" TFT screen?

I have an idea for a gaming device that I could wire together from stock components and possibly sell. I'd like to create a device that has a 5" TFT screen with a simple UI, is manipulated with ...
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3answers
38 views

Inrush current from DC motors causing Arduino to reset

I've got an Arduino controlling a relay. The relay controls two small DC motors. All of these components are powered through a 9v power regulator. I need the power regulator because the power ...
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3answers
110 views

How to build a programmable sticky button

I'm trying to build a button that can exist in two modes. Either it springs back after being pressed, or it stays pressed. I want to switch between these two modes using some complex logic, controlled ...
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22 views

Arduino Bootloader for ATmega168PA

I have burned an arduino bootloader to an ATmega168PA. I want to use the internal 8MHz oscillator for the ATmega, and I used an arduino Uno as an ISP. For that, I did the following: Created the ...
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22 views

Need to have two volume levels for a magnetic transducer buzzer

I am using an ATMEGA328PB TQFP and the Arduino IDE to activate a magnetic transducer buzzer (CUI CSS-14B20-SMT-TR). I'm using the Arduino Tone Library to produce 3 short beeps and then a 1 second ...
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2answers
36 views

Can an ATMega328p be bricked such that it cannot be programmed but still works?

I cannot update the program on my ATMega328p-AU (with the old version of the Arduino nano bootloader burnt to it). Oddly enough I can still talk to the program running on the uC (query and read out ...
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40 views

How to make a word processor for a TFT Display that's getting text from an SD file? [closed]

I'm using the Adafruit_ST7735 (with the Adafruit_GFX) library to display stuff on my 1.8 TFT display. When I set the tft.setTextWrap(false); it does wrap the text but it doesn't care about words. For ...
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3answers
61 views

How to read serial data from usb device using arduino?

I am pretty new to programming and electronics. I have a orion star 211 pH meter with usb and rs232 outputs. I want to record the pH change with time using an arduino but the first problem is reading ...
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39 views

arduino step motor [closed]

hello I want to stop 20 steps forward then 20 steps back and stop it completely after 10 attempts to prevent it from vibrating when the stepper motor rotates while it is exposed to any jams. I would ...
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1answer
37 views

Powering 10 servomotors + Arduino

I'm set on using a single Li-Po for a whole 10-servo robot, splicing the power with those Wago connectors into three step-down converters: 5V for Arduino Uno & PWM driver with 7 servos (6V would ...
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3answers
68 views

Running IF only once

O holy simplicity. I've seen lots of solutions for this but none that will fit to my scheme. First of all, lets add simple code: ...
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1answer
25 views

Two Different Crystal Resonator on Arduino Mega?

I'm looking to building my own circuit board based on the Arduino Mega 2560 and looked into their schematic. There are two micro-controllers on there; the ATMega2560 and the ATMega16U2. Both of them ...
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43 views

How can I connect the MTCH6301 touch sensing controller to an Arduino?

I made this PCB (image below) and I connected all the copper area to the touch sensing controller (MTCH6301), but I don't know what to do now. What do I need to connect the MTCH6301 to? I want to be ...
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2answers
32 views

Cheap RFID tracking to log entry and exit?

I am performing an experiment where I want to track entry and exit of insect from a small opening over time. My goal is that each insect will have a tag and each pass through will ping the reader to ...
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1answer
26 views

Controlling 3-pin pinhole camera from drone using Arduino

I've got a pinhole camera from an old drone that I dismantled a few years ago. It has a built in MicroSD reader, and 3 pins (red, black, and yellow). I'm wanting to repurpose the camera for use with ...
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0answers
26 views

Can I connect a PSU to the Ramps 1.6+ and the USB to Arduino at the same time?

I just want to connect the Ramps to the power supply unit and upload the Marlin firmware to the Arduino. I found three possible outcomes 1. Problem I found one person here who says that we should ...
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1answer
72 views

Simultaneous reading of multiple I2C devices with the same address

I'm a teacher of a secondary school in the Netherlands. My students are working on a sun sensor placed on a moving object, with which the attitude w.r.t the sun is determined. A couple of ambient ...
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1answer
78 views

Need help understanding a portion of the Arduino Mega 2560 schematic

I'm planning to build a custom Arduino Mega PCB, so I downloaded the schematics and design files. For the schematic, I have a fairly good understanding of the connections, components, and their ...
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1answer
32 views

Sim Card extender Circuit

I am looking for suggestions to solve a Sim card problem. In my system I have a microcotroller interfaced to an Lte mode and this resides in an outdoor elevated position. I would like to put the Sim ...
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2answers
112 views

How to implement a discrete transfer function into an arduino?

I am here asking how does one transfer a difference equation into a MCU? I have never done it personally and looking into this topic I was never able to find a good answer. Its usually used with ...
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1answer
12 views

LCD backlight LED voltage. Insignia (Sharp) Model NS-32D20SNA14

I have a TV LED back light panel from Insignia (Sharp) Model NS-32D20SNA14 I have isolated the back frame with the LED panel. The power clip is intact. Everything else is removed. Using a VOM to get ...
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1answer
39 views

Integrating an Altair module with an Arduino

As a disclaimer, I have experience with Arduinos and Raspberry Pis, but I know embarrassingly little about electrical engineering and anything beyond the basics. Most of my previous projects consisted ...
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0answers
15 views

Communicate and charge both arduino board and android tablet

We want to connect and arduino to an android tablet via USB and charge both at the same time. We have the arduino talking to the tablet and the tablet is running a nice app to display the data from ...
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1answer
36 views

Shunt resistor to measure voltage on the load resistance

I have to answer this question but I can't do it at all. Can somebody help me, please? The question is: "There is current control on the feature. Let the bus works on batteries with nominal voltage ...
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0answers
46 views

What size capacitor do I need to reliably close a 1" US Solid motorized ball valve?

I am making a water feature that will involve a stream fed by the basin of a fountain with a pump at the end sending water back into the fountain. To control the water flow rate through the stream and ...
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2answers
36 views

MC33269ST-5.0T3 Voltage Regulator, does it exist?

I'm trying to implement an Arduino MEGA board into my PCB that I'm designing and I've come across a part on the schematic, MC33269ST-5.0T3. I can't seem to find it anywhere, and it isn't on digikey. ...
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1answer
33 views

How to build synchronous boost converter with IR2104 mosfet driver?

Does anyone know how to build a synchronous boost converter with IR2104 mosfet driver? I am a beginner and I have noooo ideaaa how to connect the circuit. The placement of inductor and capacitor ...
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1answer
35 views

Why are Global Struct Variables not visible in Loop and in Function?

I created variables in a struct above void setup() so they would be Global. Prior to this the code ran. In Loop and in the one function I get error the variables were not declared in this scope. ...
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6answers
16k views

What is this symbol on the Arduino Uno schematic?

These look like capacitors, but they're not labeled and I'm not quite sure what to make of them.
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1answer
43 views

BJT Constant Current LED Driver - Inverted behavior?

I'm trying to use build a constant current Led driver, using two BJTs (BC338 and BC547). The idea is to be controlled by Arduino's PWM, for dimming. I'm using the circuit bellow. The led is a white ...
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1answer
52 views

I want to use the following command (PINC & B00000011) to read 6 different conditions from hall effect sensors

I need help with this code. I don't understand why it doesn't execute all 6 conditions. I am using PINC which is PORTC (A0-A5) on the Arduino Uno to read in 3 hall effect sensors from a BLDC at the ...
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0answers
36 views

Read triangular wave with positive and negative part to Arduino

I generate a triangular wave with a 555, and I want the Arduino to read this signal. What should I do to read negative part?
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4answers
562 views

How to detect distilled water?

I'm trying to create a circuit that detects water, however, I'm looking for a very accurate circuit that can even detect distilled water. My current circuit uses an Arduino that has a pin constantly ...
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0answers
65 views

Why did my motor drivers burst into flames when I disconnected them?

I have set up an old mobility scooter to be remote controlled with some cobbled together boards from the usual sources. Everything was working well for weeks until one day when I was trying to bind a ...
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0answers
70 views

BC457 transistor shuts down entire power on high signal

simulate this circuit – Schematic created using CircuitLab I'm making a microcontroller circuit to control a heater using an ATmega328, a 5 V relay, a 16x2 LCD display, a transistor etc. Now ...
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0answers
46 views

Digispark - Bootloader stuck

I have a digispark that I want to reprogram, soldered into a circuit. I have burned the default t85 micronucleus firmware. This is the command I used: ...
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1answer
65 views

PNP led on when it should be off

I am using a CTHSCIC06 capacitive touch button and have connected as per the datasheet (the motor side of the circuit is not needed) however I am still having trouble around the pnp side of the ...
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1answer
42 views

Design check for a high-side switch circuit, for driving Nixie tubes

I am designing a circuit that enables using an Arduino board to drive Nixie tubes (https://en.wikipedia.org/wiki/Nixie_tube), which are LED-like devices that require ~170V to ignite, and ~140V to ...
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0answers
14 views

Advice on powering a fan in a A1200, battery timeout auto poweroff question

I need to wire up a 3-5v mini fan inside an Amiga 1200 computer to attach to the graphics chip. I am currently connecting the fan to the 3.3v output of an arduino, and have the lid off my A1200 and a ...
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1answer
41 views

ATMEGA328 USBasp schematic

I have some problems about programming my ATMEGA328 with USBasp programmer. I have found different schematics for the connections and I do not know which I have to use (and I'm afraid to break ...
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2answers
211 views

Can we use pir sensor while it's moving?

I fixed the pir sensor on the top of servo motor.while the servo motor's rotation the pir was also rotated by servo motor's motion.but the problem I had founded that pir sensor had always indicated ...
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0answers
24 views

Arduino w 5V Relay Wiring

I am having trouble actuating this relay I bought off Amazon. I have been successful actuating the relay but am having issues wiring up a LED to simply turn on and off. My setup looks very similar to ...
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1answer
43 views

Interrupts are firing when touching ground with metallic things

I'm making a circuit on a breadboard (before SMD design) for a battery-powered device. When USB is connected to any wall-adapter, the device wakes up when touching any ground wire on the breadboard ...
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2answers
28 views

Solid state relay is not completely open when control inputs are not connected

I am trying to control a 12W light using this solid state relay. Even when I haven't connected my control inputs through an Arduino the output light glows(very dim). I have an input voltage of 230V. ...
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3answers
85 views

Levelshift distorts when freq is higher than 4kHz

I 'designed' this circuit to shift a level coming from an arduino to -5/+5v signal. It simulates well in EASYEDA. I also built it on a breadboard with a symmetrical powersupply and signalgen giving ...
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0answers
49 views

Interrupt not affecting while loop

I have this little problem. I'm moving a stepper motor in one direction, and it should stop when it hits thevend switch located at the end of railing. I hooked that switch to interrupt 2 on an Arduino ...
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1answer
34 views

Is it possible to use i2c accelerator to multiplexer input?

I have 10ft long wire cabled i2c 4 buses (for 8 sensors, sensor are not in the same place each has 2 i2c addresses), I try to use i2c multiplexer PCA9548A with an i2c accelerator Ltc4311, i2c ...
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1answer
27 views

How to handle low voltage stepper motors?

So I've been looking at various NEMA-17 stepper motors, and I noticed that a most have an extremely low voltage. For example, on this page, there are NEMA-17 motors ranging from 2.8V to 5.4V, with ...
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1answer
71 views

What is the simplest EEG detecting circuit possible? [closed]

Suppose I took an Arduino and hooked it up to two electrodes: one to the front part of my head going into A0 and another connecting my earlobe to ground, why wouldn't this system be capable of ...
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0answers
30 views

OV7670 camera, how to use external SPI SRAM?

I'm using OV7670 camera with no FIFO and Arduino Mega2560 and I want to send 76800 bytes to my laptop, because of Arduino RAM limitations, I'm planning to use Serial SRAM 23LC1024 (1Mbit) so I can ...

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