Questions tagged [arduino]

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133 views

Why did my capacitor explode? [closed]

I'm new to electronics and am trying to use an Arduino and 2 BTS7960s to control 2 motors. I am powering the circuit with a 20V max Black and Decker battery. Here is what the motor part of the circuit ...
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3answers
94 views

use NPN as a switch between nets that don't have a voltage difference

I'm trying to use an Arduino with a 2n2222 npn transistor to replace the functionality of S1 in this diagram. This is the schematic for my TV remote. I want to replace the physical switch with a ...
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0answers
57 views

ADC values too large on HAL stm32

Hi I am trying to read in a voltage value from a TDS sensor on my stm32 nucleo144-h723zg. The problem is that the voltage values are too high. The manufacturer only provides code and datasheet for ...
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2answers
116 views

PWM to DAC with operational amplifier

I was following this project/tutorial shared on the website of Arduino to convert PWM signal into DAC output. From what I can see, it uses an operational amplifier with a low pass filter (22uF ...
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0answers
33 views

What power supply to use for Arduino Nano + NEMA 17 motor?

I am making a small project in which I am trying to drive a NEMA 17 stepper motor (1.5 A per phase, I would use it in fullstep mode probably) using an Arduino Nano and an A4988 stepper motor driver. I ...
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1answer
163 views

Using an arduino to measure a voltage in the range of 0-20mV

I'm building a control panel for an old altitude training machine and I need to measure the output of an oxygen sensor with an arduino. The oxygen sensor (medical oxygen sensor OOM202) is a micro fuel ...
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1answer
57 views

Connecting multiple full bridge load cells together with HX711

I am doing a project where I need to connect 2 or 3 full bridge load cells (the one with 4 wires) together. I have read that to have such an arrangement I need to connect the load cells in parallel ...
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1answer
32 views

Read Throttle Position Sensor and Display the % of Throttle Used

In a previous post in the Motor Vehicle Maintenance & Repair section, I was able to read two signals from my electronic throttle position sensor in my car. I would like to read these values and ...
2
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1answer
218 views

Arduino PWM LED lights dimmer using MOSFET - Rise time problem

I’ve made a simple PWM dimmer for LED lights (50W) using IRLZ44N MOSFET and Arduino Uno. PWM frequency is 490 Hz. The Arduino is programmed in a way that dimming tries to mimic daylight using ...
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2answers
65 views

Is it possible to read the value of a switch in another active circuit?

I have a magnetic lock with an integrated switch (NC when locked). The lock opens when supplied current and stays open even after the current is no longer supplied (until someone manually closes the ...
2
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1answer
48 views

Protecting against static interference/noise for encoder

I have a chassis that is made from box steel beams, they are painted/surfaced. Attached to it is a fiberglass tub which can rotate. Attached to the fibreglass tub are supports and mounts where some ...
0
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1answer
44 views

Best way to use semiconductor as switch for 12v source, with 3.3v (or 5v) base

I am super rusty with circuits and I am just trying to find the simplest implementation for what I am looking for... I want to turn on an LED strip that requires 12v input, using a pin that pushes out ...
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0answers
49 views

Can't burn bootloader or upload code through Arduino IDE to attiny85 using USBasp

I've wired everything up on a breadboard using the datasheet of the attiny85 and the 10 pin layout of the isp programmer, installed the libusb-win32 USBasp driver through ZADIG, and setup attiny85 ...
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1answer
43 views

LS7220 passcode IC

I bought the LS7220 IC which is designed to check passcodes. For some reason, the pin 8 Lock Status Output does not illuminate the LED when I connect the power, and when I bridge the VCC in sequence ...
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2answers
82 views

Are large currents from my motor killing my Arduino?

In my last question about the circuit below, it was mentioned that the motors can emit large amounts of current at peaks. I am worried that this large amount of current may be the reason I keep ...
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0answers
35 views

How to connect a 23LC1024 to a breadboard?

I just got my 23LC1024-E/ST module, and I realized how tiny it is. How do people work with this? It's obviously not breadboard friendly. Are there RAM modules out there for Arduinos/ESP8266s that are ...
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5answers
192 views

Why does a MOSFET's temperature shoot up when the gate isn't at the correct voltage?

I've fried 3 MOSFETs today, quite frustrating. When I connect the gate directly to positive, it's pretty happy, the motor runs and the FET temp stays below 40 deg C. When I connect the gate to ...
3
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2answers
111 views

AD5693 digital to analog converter

I am using an AD5693 as digital to analog converter with an Arduino Uno. I have connected the SDA andSCL pins of the AD5693 to the I2C pins of the Arduino Uno. I have connected the LDAC active low to ...
-1
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1answer
55 views

Can't get Arduino output to work using IRremote Arduino library

I'm trying to send an infrared signal to my LED-strip-receiver, but no code makes the LED work (light.) I have the IRremote.h Arduino library installed on version 1.18.15 and I found this example/test ...
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1answer
55 views

My "Sun up" circuit is malfunctioning in circuit, but works fine on USB test bench

I am trying to build a circuit to use the Arduino Uno R3 as a switch for a relay which makes a connection only during daylight. I don't know much about my LDR, pretty sure it is a 10K. I am dividing ...
6
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5answers
3k views

Why is my Arduino's GND pin emitting power instead of grounding it?

I was debugging the circuit below with my new multimeter when I found that my Arduino's ground pin was actually emitting power. I connected the longer leg of an LED to the ground pin and confirmed ...
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1answer
72 views

What type of MOSFET can be controlled by an Arduino PWM output? [closed]

I'm looking for a MOSFET that can be used controlled by an Arduino output that increases and decreases in voltage. I need to control a bright LED that needs 5V. The PWM output on the Arduino doesn't ...
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2answers
71 views

Reverse Engineering RS-485 Signals - Floating Issue

I'm currently trying to reverse engineer RS-485 signals, see waveforms below. As you can see, Signal 1 (Yellow) and Signal 3 (Purple) are a differential pair and seem to be floating. Here's a closeup ...
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1answer
113 views

How can MOSFET drain be used as ground for a load?

I'm trying to understand how the schematic from this github repo works. It uses an RTC to turn on an arduino, via a npn transistor and a mosfet. I'm novice with electronics, so this might be a ...
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1answer
27 views

ATmega 2560, additional software serial port advice

I am trying to make a project with an ATmega 2560 microcontroller. I need 5 UARTs, but the microcintroller has only 4 of them. I want to connect 4 of them to RS485 and 1 additional software serial to ...
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1answer
60 views

Designing a model with lights and sound. Looking for feedback regarding powering everything correctly [closed]

I know its early in the year, but I'm designing an Xmas decoration to be ready by December 1st while I've got some free time coming up. The concept is a desktop wooden church that contains a 5W ...
0
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1answer
38 views

How power Arduino Mega 2560?

I want to run Arduino Mega 2560 outdoor for long time. I found this choices: 1 - 12 V power jack: It makes the board so hot so I skip it. 2 - Vin: It makes the board so hot so I skip it too. 3- 5 V ...
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0answers
25 views

What methods are there to calibrate force sensors?

I have a DIY force sensor made from velostat in a voltage divider - Arduino configuration outputing voltage to a display from an applied force to the sensor. I'm looking for sources / books / pdfs / ...
0
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0answers
21 views

LS7220 IC question for HIGH and LOW

I am learning about the basics of electronics. I bought an LS7220 chip for a keypad lock, but using it turned out more difficult than I expected. I have attached it to a 9v battery at pins 9 and 14, ...
0
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1answer
41 views

ATtiny13A - PWM x 3, ADC x 2 [closed]

I want to control 1 RGB LED and 2 potentiometers by ATtiny13A. I want control the RGB LED by 3 PWM ports and read values of 2 potentiometers by 2 ADC ports. Is it available by ATtiny13A? Can I ...
1
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2answers
52 views

Multiplex Controllino (Arduino) 0-10V input using SSRs

I have to read six 0 - 10 V analog signals but I only have one 0 - 10 V input on the Controllino. I figure I could use six solid state relays and multiplex the signals. When a relay is on it'll allow ...
1
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1answer
59 views

SSR with AC valve doesn't turn off

I don't have much experience with solid state relays. I am going to describe my problem. I have a SMC AC valve that I want to control with a Crydom SSR and an Arduino UNO. When I send the signal to ...
0
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1answer
60 views

BMS for 12V Lead Acid Batteries (48V)

I'm thinking about creating a BMS for my Battery Bank. The bank consists of 12 VRLA Batteries connected in 4 series and 3 parallel configuration to get a 48V system. For this bank I wanted to monitor ...
0
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1answer
39 views

How do I convert a switch’s single output into a double output per keypress?

I am new to electronics compared to many here I’m sure, but I have some experience with Arduinos and basic circuits and PCBs. If for example I had two mechanical keyboard switches wired up to an ...
0
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1answer
68 views

How can I correct these Verilog syntax and declaration errors?

I am currently working on an Arduino to NIOS II Compiler that I am using on GitHub. I have provided a link to the compiler here: https://github.com/dimag0g/nios_duino. The issue I am having is that I ...
0
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1answer
48 views

4051 MUX as 8-Pole Switch

I am a beginner in electronics so please bear with me if this question seems stupid for you. I have a circuit that I want to modify at certain points. All in all there are 8 modify points in the ...
5
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5answers
3k views

Does this mechanical switch really have no bounce?

I'm prototyping with a bunch of no name mechanical button mini-switches and SAM D21 microcontroller (Adafruit Feather M0). The switch is connected directly between the ground and the input pin #19 (...
1
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0answers
57 views

Are there protection diodes on the ADC inputs of the Arduino Due / Atmel SAM3X8E ARM Cortex-M3, and what are their characteristics?

I am using an Arduino Due based on the Atmel SAM3X8E ARM Cortex-M3. I need to use the ADC in a real world application, and I have some long cables leading to it, possibly some inductive effects and ...
0
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2answers
58 views

why Arduino Nano Atmega328P D9 & D10 GPIO Blowing while using PNP Transistor S8550?

I am trying to make an Simple Sinve Wave Inverter circuit using below Schmatic. As soon as I connect this circuit D9 & D10 gets damaged. should I change the value of 100Ohm to 1K ? will that solve ...
0
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0answers
29 views

Current sensor problem

I'm using INA219 to read the hold system current like the schematic The problem line in the DC-DC converter. When I use IC MP2315 DC-DC converter, INA219 seem like just read the off period of PWM ...
1
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0answers
34 views

ESP8266 Button Latch - Always On

I'm trying to build the following: Press the button shortly, the ESP8285 should turn on. GPIO16 can then be used to turn off the circuit. The button press should latch the power on. The problem: When ...
1
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4answers
212 views

PCB Design Review(ATMEGA32U4)

I have been trying to make a Watch for the past few months, but with all my prototypes I have found no success. So to try ironing out some problems I made a practice PCB to try testing my base ...
0
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1answer
70 views

Strain gauges' readings at 1 kHz

I want to connect 8 strain gauges to an aluminum scooter frame and capture readings at 1 kHz. The strain gauges are Full bridge 350 ohms with a very small output voltage (in the range of mV). I have ...
0
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1answer
33 views

What is this connection on ttgo t7?

Bord Name: TTGO T7 I have searched both in the github page and in the lilygo site but I can't find what is the use of the connector highlighted in the picture: could someone with more experience help ...
0
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1answer
46 views

Unable to control motor voltage with MOSFET and PWM

In an attempt to control the speed of a DC motor with fairly large current draw (up to 1.8 amps) using PWM, I designed the circuit below: Unfortunately, I am unable to do more than simply turn the ...
0
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1answer
70 views

Why place large resistor from gate to ground of MOSFET?

As I was learning about MOSFETS today, I noticed that nearly every circuit diagram with a MOSFET features a large pulldown resistor placed in parallel to the transistor. For example, in this picture ...
1
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1answer
33 views

Step-down Lipo voltage to 1.9v

I'm trying to power a MMA9995l, NRF24l01, HDC2080 and ATMEGA328P from a Lipo battery. The perfect voltage for this is 1.9V. Since I'm quite new to component sourcing and step-down converters in ...
0
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0answers
222 views

WS2812B first LED flickering Wemos D1 mini

I'm running 110 WS2812B LEDs with an Wemos D1 mini clone (AZDelivery) and the first LED flickers and won't even turn off but rather show red or green. I changed the data line cable several times, ...
0
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1answer
49 views

AT commands ESP8266 gives Null Pointer error - Arduino IDE

EDIT: I have just tried a brand new esp8266 and the AT commands work. But on 3 others it did not. Would this be because I have uploaded code to them? I have an esp8266 ES01, the small basic one. I am ...
0
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1answer
75 views

Water level sensor giving erratic readings

I am designing a water level sensor using two 2mm graphite rods about 10cm long. I have attached the leads for my schematic to the graphite rods using silver epoxy. I am using an Arduino Pro Mini pin ...