Questions tagged [arduino]
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DIY Fireworks Firing Controller - Issues Upgrading Design from RFM69 LoRa RFM95 Radio
I have an existing design for a wireless fireworks firing system (remote and field module) that use RFM69HCW packet radio(s) @ 915MHz to transmit wireless commands to each other. I recently upgraded ...
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How does this (active low triggered) circuit work?
I suspect this question will be trivial for many of you, but I haven't been able to find any answer online that satisfies my curiosity.
I have an ACTIVE LOW relay module that connects to a GPIO [...
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How to mount a PCB on another? [closed]
I'm designing a project with a PCB and an Arduino and I need to mount a small USB-C module (like the one in the photo) onto a main multilayer PCB (modular design).
How do I mount the small USB-C board ...
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How to drive high current +-12 V RS232 from Arduino
I am trying to send data to a Colorado Time Systems scoreboard from an Arduino Uno r3. The scoreboard uses +-12v RS232, 9600 Baud, 8 data bits, 1 stop bit, even parity. The resistance of the ...
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MeanWell DRC-40A "AC OK" pins to Arduino nano ESP32
I would like to detect if my DRC-40A is supplied by mains (220v AC) with an arduino nano esp32.
I thinked in this two options:
Is it better A o B?
I also want to keep safe the Arduino's 3.3V.
The ...
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What is the best way to generate -12V from 12V SMPS adapter?
I am trying to create electrical stimulator for myoblast cell culture in my lab. I am trying to do this with just 12V adapter (SMPS), Arduino, and some simple op-amp circuit. I thought I could simply ...
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Why is Shunt Voltage Reference (LM4040DBZ-3) Not outputting a stable 3V supply
Below is my schematic I have for the LM4040DBZ-3. I wanted to use this voltage reference as a stable supply voltage for my ADC MCP3208, but I am not getting the expected 3.0V (I am getting about 2.984 ...
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How to increase capacitance meter range with 555 timer, and what to do with Arduino
I am looking at this schematic from Nuts and Volts of a semi-auto ranging capacitance meter, which I will eventually hook up to an Arduino or some other microcontroller. Its range is 0.1F–0.01μF, but ...
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esp32c3-supermini with latching relay in deepsleep
I wanted to build a small outdoor light for my home, that would use a latching relay controlled by microcontroller to power the external diode.
The idea was to have a schedule when this thing is ...
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RFID RC522 module not working with M5 Stick Plus 2 - no response, need help with setup
I'm having trouble getting an RFID RC522 module to work with my M5 Stick Plus 2 (ESP32). The module shows no response at all - no tag detection, no errors.
My setup:
M5 Stick Plus 2 (ESP32)
RFID-...
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ESP32 controlling a magnetic starter motor resets when switching off
I'm hoping someone could help me out with this one final issue with my project.
I have an ESP32 that controls a magnetic starter. The issue is when the magnetic starter hits the off switch, the esp32 ...
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WS2812B glitches when data wire is connected or touched
I'm using an Arduino Uno and a WS2812B LED strip powered from separate USB ports on the same wall charger (shared ground).
The strip glitches (random colors, flickering) as soon as I connect the data ...
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How are recommended voltages determined for a PCB?
Say I buy an Arduino UNO R3. The specifications state that it is rated for a recommendation of 7-12V and that the limit is from 6-20V. What differentiates these two and how did they come up with those ...
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Having trouble calibrating the AD5933 getting oversaturation?
I'm trying to get an AD5933 Impedance Converter module (connected via I2C) to work with a Raspberry Pi, but I'm consistently running into an issue where the chip reports an Over-range/Saturation error ...
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I2C Max30102 sensors not working on raspberry pi 5
I am trying to set up my raspberry pi 5 with the max30102 sensor via the i2c interface. I bought two sensors, but neither seem to work. I'm trying to rule out faulty sensors and I don't have a ...