Questions tagged [arduino]

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18 views

opt101 (photodiode) adjust voltage output

I'm using the popular OPT101 photodiode with 5V. How can I scale the output between 0 and 5V? Now the output is ca 0-400mV (maximum is room light here). I'm a noob, and if I had more experience, I ...
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23 views

Can I use software serial rx on attiny84 pin 0?

Please address using ATtiny84 physical pin 13 (logical pin 0) (RESET) ("D10"?) as a software serial RX.
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33 views

ESP32 Wroom doesnt boot up directly after USB power up, however it works fine if you reset it one time there after

I have been working on a battery powered ESP32 board for the Institute I am working for. It had some other issues relating the voltage regulation circuit that I implemented. Those are solved now after ...
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1answer
86 views

What linear voltage regulator alternatives are there for use in IOT applications?

I had been having problems auto-uploading reliably to a ESP board that I have designed. It would sometime upload the program and sometimes it wouldn't. Seemingly completely at random. The issue was ...
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23 views

Using two serial devices with Arduino Yun

I would like to use two serial devices with Arduino Yun: the serial LCD screen and the Grove RS-485 adapter (to read the data from RS-485 device). Is it possible to use two serial devices ...
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30 views

Saving one measurement one display and recalling it using Arduino

I am using an Arduino with 49E Hall sensors and a 16x2 LCD display and buttons. If I push the button, I want to display the current measurement of the hall sensor (one number). And if I push the ...
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28 views

Arduino relay board

I want to make my own board of relays for using with an arduino. I found this schematic https://howtomechatronics.com/tutorials/arduino/control-high-voltage-devices-arduino-relay-tutorial/ But I am ...
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1answer
55 views

Power supply to project board issue

I'm trying to build a project on automatic liquid dispenser using the ATmega328P. I've made the circuit. Before making the PCB I've few issues to be solved. I'm powering the board using a 12V, 5A ...
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60 views

Can ESP32-WROOM-32D work raw?

Can ESP32-WROOM-32D or AI THINKER ESP32-S or similar modules work raw without extra hardware with sketches from Arduino IDE? Can they get flashed from Arduino IDE using usbasp/usbtinyisp etc? edit: ...
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1answer
55 views

Data Logic Levels Sent From Sensor Are Not Going All The Way Low

I'm having issues receiving data from a 3.3 volt logic level R503 Fingerprint Module that is sent via it's Tx pin using UART. The logic levels are converted to 5 volts using a bi-directional converter....
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12 views

mcp3008 and sd card module error

I am making a datalogger arduino based, it reads from the adc mcp3008 and save on the sd card ADC and SD Module uses SPI . when the adc is used alone it works fine . but when adding the sd module to ...
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44 views

What programmable board should I use for my project? [closed]

I have a small project going on, you can call this a research project that I needed to pass a certain class。 But the thing is, I don't know what I should use Arduino? Raspberry Pi? Im a complete ...
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26 views

Analog signal in ESP32 Microcontroller

I have a question regarding an analog signal input or ouput in ESP32 So, i was working on flow sensor project that require flow sensor as the sensor and DC Motor as the mini water pump. My goal is to ...
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1answer
57 views

ESP32-PICO-D4 can it work raw?

Can this system in package be used raw without any other components(resistors,capacitors,inductors,crystal etc)? If I create a test board with holes for every pin to test it with arduino ide would it ...
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2answers
109 views

How exactly does a basic EMF sensor work?

Halloween is coming up, and inspired by the simplicity of this project, I'm asking for a more technical explanation (and / or resources to do that) - this seems to be either missing or too obvious to ...
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1answer
37 views

Drive a DC Motor with a WS2811 chip

I'm building a robot that needs a lot of small hobby motors (or similar) to operate in sync. I was looking for ways to have as many of them controlled by a single source of truth as I am not sure I ...
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1answer
91 views

What ESP32 UART Auto-Program Circuit Alternatives are there?

I am currently designing a board centered around the ESP32. I want to implement an auto-program circuit for convenience's sake, because I don't want to hold a boot button each time I want to program ...
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1answer
65 views

16 Segment LED, 4 Digit, Common Anode (4 sets)

I'm trying to make an F/A-18C UFC like this: Now a while ago I bought 6 x "4 digit 16 segment" LED, which happen to be common anode (DataSheet) What i am looking for is a way to drive all 4 ...
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0answers
58 views

Problem with switching solenoid valve by relay

I've been trying to drive a 12volt solenoidal valve with a 5volt relay .Relay is working perfectly for driving normal loads(light bulbs).But it is not driving my 12volt solenoidal valve. I've already ...
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3answers
99 views

Solar panel not charging LiPo Batteries

I am a totally beginner in electronics and I am facing a big problem with my prototype. I am trying to create an autonomous circuit that runs an Arduino powered by a 3.7 LiPo battery. The problem that ...
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0answers
28 views

AT commands no answers ! SIM808 and Arduino

I will try to explain my problem... I'm using a SIM808 GSM-GPS click module and a ARDUINO nano 33 IoT board, I'm sending the command "AT\r" thanks to the TX port from the ARDUINO board to ...
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1answer
50 views

How can I make a “digital switch”?

It would work that way: An IR sensor is used as input, if it receives some IR signal, the input is 0. If it detects that input, it should output some voltage. If it detects that input again, iy ...
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0answers
21 views

How are the connections made to the driver module as shown in the figure below

How are the connections made from the Arduino, the battery, and the motor to the motor driver module? I am not able to make these connections.
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1answer
46 views

How to use separate power source for raspberry pi + Arduino and motors as shown in the image below

Is it possible to make this circuit or will this work? I want to power the raspberry pi and Arduino with a powerbank and motors with a separate battery through the driver module as the diagram shows. ...
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4answers
59 views

How can I lower the speed of a 220-240V (100mA, 16W) inline ventilator fan?

I have installed an inline fan (220-240V, 01.A, 16W) to draw air out of my kitchen to outside. It works well, but a little too well, and is noisy. So, I would like to reduce the speed somehow, say to ...
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1answer
41 views

How can I power an Arduino Uno using a 9V battery and a separate battery for raspberry pi 3 [closed]

I want to power an Arduino using as separate battery power and raspberry pi with a separate battery
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0answers
65 views

ATmega328p Motor circuit resetting the controller

I've made a circuit to run 5V DC motor via ATmega328p micro controller GPIO as shown below.whenever there is a connection to 5V DC motor, and if it tries to actuate the motor, micro controller will ...
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3answers
41 views

Star Delta Starter control with Arduino

I don't have any experience with star delta starters but on doing some research I concluded that 2 push buttons(NO and NC) are required to turn on or off the system. I have a pump which is star delta ...
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0answers
47 views

ATmega328P development board not working

I've made a development board for ATmega328P like Arduino Uno. Fig. 1 - schematic Fig. 2 - bottom layer Fig. 3 - top layer I am able to upload the code using FTDI chip (I've used the chip which ...
2
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3answers
79 views

How does input voltage ripple affect output voltage of linear regulator?

The problem starts with my 3D printer which is powered by a 12V SMPS. When it drives a heavy load such as heated base and hot end, it causes a ripple on the 12V rail. Also it affects the 5V rail with ...
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1answer
60 views

Voltage / amperage / setup for tingling sensation

There are small pens (powered by a single or double 1.5V battery) or other medical devices that upon touching your skin produce a tingling sensation. Main question: I wonder to what voltage, amperage ...
2
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1answer
151 views

Is this Arduino regulator power switch circuit okay?

(Okay so I've been informed that you're supposed to edit your existing post and not make a new one even if you want to change the question, so just FYI for anyone reading the comments, this is ...
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1answer
106 views

Is Lora maximum transmission 1 km in real?

I'm new to wireless communication and Lora. I'm using Lora Ra-02 and Arduino UNO and small 800 Mhz antenna. I'm using Arduino website library. How can I increase that range? What do I need to do to ...
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1answer
62 views

MOSFET in place of potentiometer

Since in potentiometer we control it by rotate its knob anticlock wise or clock wise...so in that place i want to control it by using MOSFET and Arduino means the working of the knob i want to control ...
1
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1answer
60 views

Should I use a Micro:bit or Arduino or something else?

I am creating a board with the following components: Inputs: Momentary button Reed switch Rotary Encoder with 24 detents Output: Bluetooth The idea is to have it connect to a mobile device, such as an ...
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1answer
38 views

i2C connection setup

Following the diagram below, is it wrong to use the MCU 5V to supplying both SDA and SCL lines? I applied this into my circuit and my device are not communicating when connected to this circuit.
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45 views

Program atmega328p microcontroller [closed]

I have an Arduino uno board. I want to program new atmega328p microcontroller using it without any additional circuits. I want to upload Arduino codes to atmega328p microcontrollers. Please help me.
0
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1answer
22 views

3.6 Vo-p rated buzzer on 5 V Arduino circuit

As a small buzzer to output simple audio, I am considering the Jiangsu Huaneng Elec MLT-5020. Other buzzers of that size are also an option, as long as their footprint isn’t much bigger than 5×5 mm. ...
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1answer
25 views

How to add a MCU signal to turn off this push button mosfet-based latching circuit?

I’m using this circuit to turn on and off an Attiny85 and a led driver with the push of a micro switch. My circuit is powered by 7.4V battery. In the “load” part of the circuit there’s a voltage ...
1
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1answer
52 views

Power Supply AC/DC Power OK Signal Control

I will combine 4 ac/dc converter (1000 W) by using parallel operation mode to create 4 kW unit. I will add 4 LEDs to observe converter signal health. There are digital output including POWER ON ...
3
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2answers
108 views

How can I increase the output current to make it sufficient for relay module?

I am using the following circuit as an industrial warning and control system. According to input signals, LEDs and other outputs are HIGH or LOW. So, 24V in input is not always connected actually. ...
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4answers
140 views

Programming many Atmega328p at once for mass production

How can I program multiple ATmega328p at once? Like, for example, the Arduino Uno. How do they program it for mass manufacturing production?
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1answer
79 views

Power supply whine noise

I built an RGB LED strip controller with a Wemos D1 mini, using this schematic: On the phone I have a color picker and just roll over it and the LED color changes accordingly, but sometimes I hear a ...
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0answers
26 views

How do I read the state of 3 output pins on an Arduino UNO and then NAND them together?

So I am working on software to control a H8 inverter. I got code that does SPWM for a 3 phase inverter online. I then applied a software NAND gate on 3 outputs from the Arduino UNO and this is the ...
2
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2answers
364 views

DC motor with motor driver included

I'm trying to make a kit for my students for online schooling next semester. On one of the modules, I want to teach them how to control a DC motor using a microcontroller and a 6V battery pack. ...
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0answers
31 views

Issue with daisy chained arduinos and serial communication

I have a setup with a 32U4 based board and 2 daisy chained 328p based boards. Boards are connected via 4 wires : VCC, GND, TX, RX 32U4 is powered by USB Daisy chain is : ...
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0answers
35 views

Read an EEG with Arduino

Reading the signal of an EEG is the problem of reading low voltage. An Arduino is not able to read such low voltage with good accuracy, but an arduino is cheap. So I would like to amplify the signal ...
0
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1answer
32 views

Why a newer TOP value in the Atmega328p Timer1 has to be greater than the values in all The compare registers?

The datasheet mentioned the following on p.167 When changing the TOP value the program must ensure that the new TOP value is higher or equal to the value of all of the Compare Registers. If the TOP ...
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1answer
78 views

Problem with making an Arduino-like board

I'm making my own Arduino-like board with an ATmega328p and an FT232RL. After realizing the circuit (making sure everything was correct) I had some prototypes made by JLCPCB. Later I bought the ...
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0answers
18 views

403 Error , NodeMcu to SQL server

Im trying to send 2 variables to SQL database from node mcu. Node mcu , my laptop which has the SQL server all are connected to the same wifi network. following are the codes for my node mcu esp8266 <...

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