Questions tagged [arduino]

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

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Wireless serial programming without the need to press a button to program it

After a long play, I made this adapter to be able to program a Pro Mini wireless via BlueTooth. The long play wasn't the adapter but the settings of the BlueTooth module (baudrate is fixed and need to ...
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2answers
48 views

How to connect wires between power supply and switch?

I'm trying to connect non-fused and European AC power socket/toggle switch to power supply. Probably very "newbie" question but as a starter I didn't want to try-fail with this thing for safety ...
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1answer
70 views

WAVGAT Pro Mini, no serial output

I ordered some Pro Minis however get some WAVGAT clone thingies. The first problem was it is running too slow (4x slower) when compiling with default "Pro or Pro Mini" board profile. Serial however ...
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46 views

How to ground external AC voltage (18V) to Arduino?

I have a project where I need to read 0-18 Volts AC in Arduino's input (0-5V DC). So I did a circuit with a diode (half wave bridge), voltage divider, and a RC circuit where I tested some values for ...
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123 views

What circuit simulators can also simulate ESP8266 and/or ATmega328?

I'm going to start soon some ESP8266 and Arduino Nano projects. I've used some simulators in the past, but none of them simulated these ICs. Dou you know if there is any simulator, that would also ...
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1answer
55 views

Charging a 3.7v lipoly battery at less then 4.2v?

I'm trying to experiment with supplementing battery power using microbial fuel cells. MFCs are batteries that produce their charge from decaying matter, but they often only get up to 0.9v (unless ...
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2answers
204 views

L298N heating up when driving a Nema 17 with Arduino

I've just bought a Nema 17 (Motor NEMA 17 40mm 1,2A 2,6kg/cm 1,8º 42STH40 1204A CNC) to build a pet feeder, and to control it I'm using a L298N driver I've also bought. I've wired everything together ...
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2answers
133 views

How do I move a motor to a desired angle using a motor encoder?

So I have this project, the goal is basically to be able to make a motor move to rotate a set of gears and move a panel attached to a hinge to a desired angle. I have a motor encoder attached to the ...
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1answer
38 views

Delay between steps, given speed in mm/min [stepper motor]

I'm building a device that have to move in orders of thousandths of mm per minute. I've got suitable stepper motor and driver, it is working correctly but I'm unable to figure out the formula needed ...
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1answer
53 views

Battery connected to TP4056 will not operate load

I have a simple circuit with an Arduino board (load in the diagram) that I want to power using a solar cell via a TP4056 board. The 18560 Lipo battery is for powering the Arduino during night time. It ...
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1answer
33 views

GSM SIM900 isn't communicating with the Arduino

When I connect my GSM SIM900 module to the Arduino and insert a SIM card, the Netlight and Status light blink for few seconds and then it stops. I am using 5V 1A to power the GSM and pins D7 and D8 ...
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77 views

Arduino based digital to AC conversion schematic

I am trying to build an Arduino based system for sending electric pulses, of 24V, 40mA sinusoidal. Each pulse is in a burst of 5000 microsecond, and each pulse is about 20 - 800 microsecond. These ...
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39 views

Common anode RGB LED lights going out one color at a time

I have a project involving 4 reed switches and an RGB LED. They are all connected to an Arduino and the code basically says each time a magnet touches a reed switch it lights up with a specific color. ...
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2answers
117 views

Looking to generate 25 Hz square wave at about 90 V AC

I am looking to build a square signal generator tuned to ~25 Hz at a voltage of ~90 V AC that can output ~400 mA. I've searched around the internet and tried a few things but I've had no luck. My ...
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1answer
49 views

Good solution for TPS54202 input filter design?

I trying to make tps54202 switch regulator for esp32-wroom which would pass EMC test. https://www.ti.com/tool/TIDA-00948 By reading guidelines of designing they say that to pass EMC test you need to ...
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1answer
95 views

what is I2c address of BNO055?

I made a custom circuit with bno055 it shows i2c address 0x70 is it possible? I used the Arduino i2c scanner. I am not getting any data aswell nothing else is connected to Arduino nano board as well,...
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82 views

Choosing Three Phase SSR

I want to control the power of heating elements with arduino and for this reason I'm looking for help for choosing the correct Three Phase SSR. I'm currently looking at this SSR with Zero Cross Turn-...
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2answers
69 views

Is the TPS54202 buck converter a good solution to pass the FCC SDoC?

I want to design a PCB with the ESP32-WROOM module which has bluetooth. I want to pass the FCC verification. I would use a linear regulator, but it makes too much heat. My input is 14V car battery, ...
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1answer
58 views

Attiny85 for wireless communication

I'm a very beginner in electronics. I'm trying to make a system which transmits a tank chemical level to a distant system. Remote system is an Arduino. For the tank unit I have 4 float switches. ...
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45 views

Calibrating FEETECH FR5311M Digital Servo

Hey everyone, I am owning this model feetch servo motor. I want to do the following:(with arduino uno) Read the initial position(angle) of the servo motor rotate the motor to desired position(angle) ...
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1answer
49 views

Controlling Multiple I/O Devices

How to manage multiple Input(Sensors like Temperature, Humidity, etc..) and output(like motors, relays, etc..) devices connected to a micro controller(Arduino UNO). There are more I/O devices present ...
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1answer
40 views

Design a debug interface for Arduino MKR WIFI 1010

I'm a TA at university, and for the next years students in microcontroller, I will design a debug interface for the Arduino MKR WIFI 1010. The 6 pads on the back is the debug interface as shown in ...
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112 views

Stepper motor vibrates, without turning

I'm trying to get a stepper motor to work, but having issues. I've done a lot of debugging, but still can't figure out what's wrong. When I try to turn it around, it just makes a buzzing sound, and ...
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65 views

ESP32 MOSFET Control with a Twist

Looking for some help with using an ESP32 (running Arduino IDE) to control a MOSFET. Currently, I have used the combo to control many things successfully by electronically "pressing buttons" by ...
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1answer
51 views

How to wire digital voltmeter/ammeter to measure arduino battery consumption

I'm not sure if you can tell but I'm a bit of a beginner, I want to wire up an digital voltmeter/ammeter combo to measure arduino power consumption. I found the following device which seems suitable ...
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2answers
107 views

Transistor as a heater device and measured by LM35 temperature sensor?

The aim is to make a temperature control circuit using an Arduino Uno as a controller, an LM35 sensor as feedback to measure the actual temperature, a TIP31C transistor as actuator to control the ...
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2answers
71 views

What are these female 2.54mm (0.1") crimp terminals?

So I but some crimping terminals to make my own custom cable connections for the first time today for an Arduino project I'm currently working on. Comparing to some older ones I have from premade ...
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5answers
175 views

Electromagnetic 7-segment flip display: H-Bridge alternatives?

I have an electromagnetic 7-segment flip display which has 28 electromagnets for 4 digits. They run on 20V, have a 7.5W power rating and need alternate polarity applied to switch between the 'on' and ...
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1answer
152 views

How to increase current while keeping the voltage the same?

I currently have an Arduino Uno board which has an output of around 5V @ 900mA. Is it possible to bump up the current to around 3-4A while keeping the voltage the same? Maybe with a transistor, but I ...
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1answer
39 views

How to connect a Sparkfun LiPoly Charger to an Arduino Nano?

I was able to upload the Adafruit SSD 1306 OLED Library to an OLED Display using an Arduino Nano. Now I want to power the Arduino Nano via a Lipo Battery but the battery must be rechargeable and I ...
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41 views

Control motor direction with BTS7960

I am using the same BTS but I am controlling it with labview. I am able to control the speed in one direction, even though I have both R PWM and L PWM connected to PWM pins 3 and 7 respectively on my ...
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51 views

Why does my circuit short when powering through the same board as compared to an external power?

I have designed a board which follows this schematic: What I’m trying to achieve is using a N-Channel MOSFET to make the SDOOR inputs connected. The SDOOR inputs are from another controller (STM20) ...
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1answer
113 views

Potentiometer volume control for a piezo buzzer in bridge (2-pin) configuration

I have a 10K potentiometer that I'd like to use to control the volume of a piezo transducer/buzzer, which is driven by one or more MCU PWM-capable pins (ranging from 0 to 3.3V). Originally, my ...
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48 views

NODEMCU _ MCP23017 IO Port Expander Schematic Design

I am designing a relay driver using NodeMCU and need additional IO Ports, therefore I have designed a schematic utilizing MCP23017. I think the schematic looks good, however before I order PCB's ...
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3answers
129 views

Connect a Switchboard to Arduino

Sorry if this is a simple question, but I‘m quite new to Arduino. What I‘m looking for is a way to connect 100+ strain gauges to one Arduino board. Now, those each need a separate ADC (HX711) to ...
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1answer
71 views

What Is The Correct Way To Recombine A Split Serial Signal?

I am trying to replace the lamp and ballast assembly in an Acer P1500 DLP projector. The ballast is an OSRAM PT-VIP-05 COMPACT. It features a UART control scheme that allows the motherboard to query ...
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2answers
116 views

Wrong ground reference producing wrong output on ADS1115

I am currently working on a project, which involves measuring current in a DC circuit and storing that generated data on an arduino microcontroller. I decided to go with the ADS1115 and a shunt, which ...
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2answers
60 views

Arduino for detecting low voltage on UPS

Scraping together some parts, I managed to build a 22AH 12V battery pack, but I don't want to damage the batteries. I am using 4x 12V 5.5AH UPS batteries wired in parallel. I have an Arduino Uno, ...
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1answer
43 views

UART noise on audio lines

I have a fairly simple circuit with an Arduino and a SA818 RF module, I'm providing 3v3 power to the SA818 via two series diodes (dirty I know) and am communicating using software serial, of which the ...
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1answer
78 views

High Power LED Circuit Design & Constant Current Source Question/Feedback

I'm trying to design a dimmable LED circuit board. It's controlled by Arduino with its PWM signals. I'm new to electronics so I have some question regarding my design and knowledge on it. I've ...
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1answer
41 views

How do I read a simple touch sensor value from Arduino? [closed]

I suppose instead of connecting to the LED it will connect to A3 on the Arduino for example but I'm having a hard time making it work. I don't know which point on the circuit should be connected to ...
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1answer
127 views

A simple Arduino Uno HC-05 system doesn't work

I have an Arduino Uno, HC-05 module and an LED. I want to connect the HC-05 to my phone and with an app be able to turn on and off the LED and at the same time sending a message from the Arduino to ...
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0answers
137 views

What is the recommended way to connect TP4056 charger module to NodeMCU v2

I want to power a NodeMCU v2 with a 3.7v 2000 mAh LiPo battery and charge the battery with the NodeMCU connected (i.e. under load). After looking into various forums, I ordered a TP4056 battery ...
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0answers
22 views

ESP8266-12E & BPM180 - Bad pressure retrieved

I have NodeMCU (esp8266-12E module) and connected BMP-180. I try to read pressure from BMP-180 in async web request, but it reads bad value. For testing purposes I log pressure in loop() - and it's ...
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1answer
112 views

Door lock solenoid with finger print & Arduino Nano

Update - 22.01.2020 Here is my schematic. I tried to use all of the comments guys below: Should I use a fly-back diode as commented after I cleared the schematic? If yes, where? Is it required to ...
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1answer
43 views

Circuit design and power management in an Arduino project with stepper motors and solonoids

I am working on a design for a Arduino driven project that controls a 1.7A stepper motor and 2 small solenoid valves. I am using a 12v power supply (Meanwell MDR-60-12) to power the stepper motor (...
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1answer
81 views

Arduino current measurement

Hello I am planning to use an Arduino to make a joulemeter for a current range of 0-30 amps and voltage range of 0-24V. The voltage measurement is fine but I have questions about current measurement. ...
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1answer
157 views

2n2222 can not make it work as gate

simulate this circuit – Schematic created using CircuitLab I am trying to make a simple switch with the 2N2222, so i can send 5 volts from a 3.3 V output pin on an arduino/raspberry pi. I have ...
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0answers
82 views

NodeMCU-12E - Conflict between I2C and SPI

I have SPI SD-card module connected to nodeMCU, and it's worked well. Next I try to connect I2C sensor, and it doesn't work. Looks like SPI conflicts with I2C, because when I disconnect SD-card, I2C ...
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2answers
498 views

Purpose of a Pull-Down resistor [duplicate]

Being just a beginner I'm really getting confused of pull-down resistors. Please have a look at the diagram below. Here there is a 10k pull down resistor is connected to ground and the pin 2 of ...

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