Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware and software. It's intended for artists, designers, hobbyists, and anyone interested in creating interactive objects or environments.
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1answer
39 views
ARP message to enc28j60
I have made the driver for enc28j60 for LPC1788 and I'm trying to send UDP message to LPC via wifi enabled device (iOS, windows over wifi). But transmission fails. Wifi device sends the ARP request. ...
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0answers
42 views
Optoisolator not outputting (DC switching)
Trying to reset, automatically, an HVAC speed control unit. The unit has an output pin H8 that goes to 24VDC when tripped, and 0VDC when running. There is no reliable ground pin (or other ground) ...
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1answer
38 views
Arduino RFID reader and pin current sourcing
I'm thinking about building the DIY RFID reader described here http://playground.arduino.cc/Main/DIYRFIDReader, with an arduino uno.
For the LC filter, I have a 330uH inductor at home (and I'm using ...
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1answer
53 views
Arduino analog only reading 40 when grounded
As the title suggests, I am trying to work out why my Arduino won't go lower than around 40 on the analog pin scale when that pin is simply grounded.
Could it be interference (it's part of a ...
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0answers
25 views
Use Arduino with Bluetooth Keyboard to control pneumatic valves / flow controller [on hold]
I’m new to Arduino but not to embedded controllers. I need help purchasing the correct material to do the following:
Bluetooth keyboard to communicate with the Arduino (the rii mini looks good)
...
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1answer
60 views
UART give garbage values after waking up from sleep(arduino)
I've made a arduino clone which has a PIR sensor, I intend to run it on 2AA, I'm using LT1302 boost converter, because the PIR sensor works at 5V, if motion is detected the message will be sent to my ...
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4answers
166 views
What are the odds of a miscalculation in an Arduino?
I am running an experiment using an Arduino that requires several million calculations per second to be performed by an Arduino. I was wondering the odds (if any) that one of these calculations is ...
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2answers
46 views
Sound when sensor leaves proximity
I am trying to play a sound when two devices are more than a certain distance apart, say 30ft.
Some notes:
The device this is for is very small, about the size of a large keychain
I would like a ...
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1answer
34 views
Arduino: FTDI to USB on another arduino
I have a Sparkfun EL sequencer board, which uses the FTDI interface to connect to a USB cable. I would like to hook up a MakeyMakey via USB and communicate between the two. I have not had any success ...
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0answers
62 views
ATmega (Arduino) programming in 3V system
I want to use a ATmega (168 or 328) with a 3V button cell. Which isn't the problem but at the moment I think about how to make it pogrammable in the target board. The board will have some peripheral ...
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0answers
54 views
How to bulid a 3D printer? [on hold]
I have been planning one the project of 3D printer for a long time, watch a lot of videos or article about related project and I found the the blog of sainsmart have published a post about the 3D ...
4
votes
1answer
77 views
Using/Charging a backup battery in a 12VDC circuit
EDIT: I've revised the circuit in response to comments from Andy aka. I have also updated my questions to make it more clear what I am asking. I'm leaving the top paragraphs for completeness' sake.
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5
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1answer
96 views
Segment display – Why selecting segment by GND
I bought display and for my surprise it works same as display i already had. I must chose segment i want to light up by GND and not by output pin on my Arduino.
Is it normal or there is something ...
2
votes
3answers
145 views
Arduino clone voltage regulator
I am sourcing some parts for an Arduino clone. My question is really simple and I am quite sure that I know the answer, but I wanted to clarify my suspicion. Can I swap out the LM7805 with this part ...
3
votes
2answers
105 views
In search of a component or device that switches multiple lines based on input selection
Okay so the foundation for my curiosity is that in dealing with Arduinos, I found they can be used to program the similar but smaller ATtiny chips. This is the main hookup configuration that some of ...
