user2497
  • Member for 4 years, 7 months
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1 answers
1 votes
2k views
Control a 5 volt water pump with an Arduino
3 votes

To use an NPN, connect a power rail of 5V to the pump's positive terminal, and from its negative terminal wire it to the transistor's collector pin. Wire emitter to GND, and place a >=220 ohms ...

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1 answers
0 votes
505 views
What is the output of A0 - A5?
Accepted answer
2 votes

You will get varying values on each read. A pin’s input is said to be floating if nothing is connected, which in simple terms can be explained as it just acting as an antenna for whatever electric ...

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3 answers
7 votes
2k views
USB and Arduino: Power Arduino, charge LiPo, and transfer data at the same time
2 votes

Use a TP4056 1A LiPo charger board (it has overdischarge protection) and a boost converter, like the XL6009. It will run you at most 5$ if you are prudent. Overdischarge protection is important. If ...

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4 answers
16 votes
4k views
Burning Arduinos one after another
2 votes

I have used a current limiter (a cheap LM317 will do) occasionally, though even 100mA will burn your devices. It is good practice to limit current. Generally don't wire a live circuit. Pull caps from ...

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1 answers
0 votes
395 views
Why is Arduino I2C so sensitive to RFI/EMI?
1 votes

Put a ground plate between your data lines and the power+signal lines used to drive the motor. A GPS ground plate is fine, see link below. You can just cut a piece of metal sheet to fit, or even use ...

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2 answers
3 votes
2k views
Can't upload to arduino boards anymore
1 votes

Since your USB ports likely work for other things (like your keyboard) and you have tried several arduinos, cables etc, now try Knoppix - it has both Arduino IDE (not the most recent version) and ...

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1 answers
1 votes
197 views
Arduino Nano /Uno USB is not getting recognized
1 votes

Assuming that the atmega328p still works fine, you can still use the Nano. I have solved this a few times by just using a FTDI breakout board (remember to set it to 5V, though 3V3 upload works on a ...

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1 answers
0 votes
508 views
RF transmitter with external 8-12v power not working properly
1 votes

Those 433MHz modules are tricky. I got the best results with 3V3 on the receiver, and 5V on transmitter. You should add an external antenna. While it would be prudent to remove the little loop ...

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1 answers
-1 votes
84 views
UID value arduino uno
Accepted answer
1 votes

Use this library: https://github.com/rubberneck/php-serial On GNU/Linux, you may need to be a member of the ‘dialout’ group. Ubuntu solves this problem by making its users members of every group, so ...

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2 answers
0 votes
121 views
Power source for arduino project
1 votes

Car batteries are wonderful, and almost never explode. A badly mistreated Li-{Fe,Po,Ion}, however... ouch. Otherwise use banks of NiMh/NiCd. If you don’t fear death, use Li-Ion batteries with a ...

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2 answers
3 votes
3k views
Upload sketch via Bluetooth using HC-06 module
Accepted answer
1 votes

Use a BJT/FET. For a NPN, connect RST to COLLECTOR, a digital pin in series with a 220 ohm (or whatever’s appropriate) resistor to BASE, and EMITTER to GND. Just bring the digital pin HIGH to ...

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3 answers
0 votes
335 views
What options do I have to get 5v on my current project?
0 votes

To supplement; if you don’t have a level converter on hand, have a look at this diagram: http://homediyelectronics.com/projects/arduino/seriallevelconverter/ Just test it on a breadboard, and if Vcc,...

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2 answers
0 votes
2k views
How to monitor 12 V LiPo charging from Arduino
0 votes

Use a 10V zener diode. Check it’s voltage drop, and use that in your analogRead logic. Get the full voltage with a DMM, and also the low cut-off voltage.

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11 answers
45 votes
10k views
Is an Arduino capable of running 24/7?
0 votes

It certainly can run 24/7. I either use 5V to the 5V pin, or a 7808 to the Vin pin to offload the vreg. Ideally it would be 6.5V, but I don’t have such supplies. You may want a decoupler cap on 5V ...

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4 answers
-1 votes
364 views
PIR with Arduino - detects only first motion
0 votes

To supplement, use an I2C backpack for the LCD and fmalpartida's newLiquidCrystal library. Set the jumper to autoreset the trigger. Wire VCC to 5V Wire S+ (outputs 3V3 when tripped) to D2 (INT0) - ...

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2 answers
0 votes
3k views
Detect when RFID card is absent
0 votes

You can edit the .cpp file and add a timeout. I did this to remove the blocking scan. Search for TIMEOUT in the Adafruit_PN532 source code.

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5 answers
1 votes
2k views
ESP8266, prints ready at start but no response to AT command
0 votes

Connect TX of arduino to esp8266 RX, and arduino RX to esp8266 TX. See this link for more info.

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3 answers
0 votes
3k views
How to wire up and trigger this SPDT relay?
0 votes

Use a driver transistor (or MOSFET, with a 4K7 pull-down), and a flyback diode with the anode at the negative terminal, and cathode at positive terminal. I used some tiny ones, which failed, so now I ...

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3 answers
0 votes
2k views
Debouncing Multiple Buttons
-1 votes

As an alternative to using two inputs, consider using a single analogue input with several momentary buttons - each with differing resistor values in series - this will let you avoid debouncing ...

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