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Results tagged with arduino
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user 11884
Be sure to use the Arduino Stack Exchange for questions that are more Arduino and less electronics.
6
votes
How to fully turn off the Arduino WiFi shield
You can use analog switches like CD4066 or MOSFET in series to power the shield. This can power off the shield completely. If using analog switch, make sure to check the current handling capability of …
- 4,632
4
votes
Arduino Question regarding the resistor
While driving a load with a microcontroller, you may add resistors on either side. This is because the current entering the LED and leaving out of the LED is the same. So if a resistor is used on the …
- 4,632
4
votes
Are these two Arduino Pro Micros jumpered correctly?
At a glance, the operating frequency of the XTAL on board may tell the operating voltage of your Arduino.
If the XTAL is 16MHz, the device is probably 5V. …
- 4,632
2
votes
Accepted
Using alarms with the DS1307RTC
By looking at DS1307 datasheet it seems that it doesn't support an alarm. Some other RTCs have alarm interrupt output that alerts the controller.
I believe that you would have to deal with alarm in …
- 4,632
0
votes
Can I use an Arduino as a USB to serial interface?
Yes, You may use a proper Arduino as an expensive USB to serial converter. Better way would be to buy a USB to serial converter from ebay for less than $3. …
- 4,632
1
vote
How to test an atmega (arduino) i2c network
You can probe and monitor the bus using BusPirate. This way you can see what is happening on the bus and will help you debug the issues.
Here is a video demonstrating i2c bus scan.
It can also be use …
- 4,632
3
votes
Why exactly does Connecting a Motor Directly to an Arduino Damage it?
Therefore when you use a proper driver circuit, your Arduino is protected.
As JYelton pointed out, Arduino pin can't deliver 40A it could be 40ma. …
- 4,632
3
votes
Accepted
AVR Assembly on Arduino through USB?
You definitely can use an USB based Arduino or RBBB+USB cable to program your target Arduino using USB. RBBB is indeed a utility Arduino that I have used in that role. … Another way to program your Arduino with another Arduino.
Programming your Arduino using a third party USB programmer. …
- 4,632
2
votes
Need a LED Display
Try to choose Common Anode type displays because with your microcontroller type it is easier to sink current than source it.
There are multiplexed displays available try to then those as you don't ha …
- 4,632
5
votes
Accepted
How do I identify identify if a resistor is 300 or 1k?
To answer your question:
300 Ohm colors are - Orange - black - brown
1 K Ohm colors are - Brown - black - red
Here is the color coding chart to determine the resistor values
Resistors with four ba …
- 4,632
6
votes
How can I drive 12v LEDs from my Arduino Nano?
You cannot directly drive 12V LEDs from arduino. If driving only one LED, use a transistor. Otherwise use a ULN2003 IC to drive multiple LEDs.
Better off, order the normal LEDs. …
- 4,632
1
vote
Is Automobile Power Viable for Electronics Projects?
When designing your own vehicle based power supply, make sure to add enough filtering. When the vehicle starts, there could be voltage spikes that may go unfiltered. Manage your own filtration.
Not a …
- 4,632
2
votes
Why are the pins on the official arduino motor shield so long?
Also it could destroy the arduino in case of short.
As you can see in the above stackup that the screw terminals are only a few mm apart from the DC connector. …
- 4,632
15
votes
How do I hook up an LED across the tx pin on my Atmega328?
In general it is not a good idea to draw a lot of current from your Rx and Tx lines to drive LEDs. The extra current draw can reduce your Fan-out to your target.
To avoid extra current draw from your …
- 4,632
3
votes
Problem powering ESP8266 with two 1.5V AA cells
Some facts about your setup:
The typical operating voltage of ESP8266 is 3.3V
Your LDO / Regulator outputs 3.3V
Your LDO input is 3V
Your LDO isn't a boost converter.
In a nutshell, you can't powe …
- 4,632