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1  Using Arduino / General Electronics / Re: the right capacitor? on: July 01, 2013, 07:18:39 pm
Hi, I'd walk past the shed and hopefully notice. This is where the arduino will come in later. Eventually I intend to hack the receiver, im thinking possibly sms message, or hooking up to a camera of sorts...
2  Using Arduino / General Electronics / Re: the right capacitor? on: July 01, 2013, 07:04:48 pm
Thank you for you reply Doug.

Do you mean for me to use the discharge from the capacitor as the switch/gate in a MOSFET? If so can you offer any advise on size of capacitor and resistance on the part of the circuit that would 'switch on' the transistor?
3  Using Arduino / General Electronics / the right capacitor? on: July 01, 2013, 06:09:07 pm
I've not used a capacitor in any of my experiments/projects yet and wondered if introducing one here would help conserve battery life.

I plan to install a basic 'alert' system in my shed which will tell me if the door is opened through the night. I have purchased a magnetic door switch from flee-bay and hacked this into the switch of a wireless door-bell transmitter.

When the door is opened, the reed switch closes the circuit and the battery sends current through the  RF transmitter and I'm abruptly woken by Green Sleeves chimes   smiley-eek-blue
The problem, If I have the door open for any length of time, I imagine the battery will drain pretty quickly since the circuit will be closed constantly.

I was wondering, if I swap out the reed switch for one that closes the circuit while the shed door is closed, the battery could perhaps charge a capacitor? On opening the door, the switch would open and the capacitor would discharge via the RF transmitter. This would happen only once per door opening. Would this work? or would the capacitor cause constant drain?

My challenges:

Where do I position the capacitor to ensure it discharges via the RF transmitter and not directly into the battery.
How do I work out the type and size of capacitor I need? The battery that powers the doorbell is 12v(23A). Does the picture of the circuit give any clues?

I've attached an image to help clarify...
4  Using Arduino / Motors, Mechanics, and Power / Re: Motorcycle light-show mod on: January 20, 2013, 06:32:59 am
Thanks for replying Habib.

So while Im off to read the datasheet on IRF540N and watch some MOSFET for dummies video on youtube, how about the signal input?
Will I need large inline automotive-type resistors? and is there more to it than that?
Will the normal running of the circuit that supplies the signal be affected by adding to it?

I intend the standalone IC to run off the motorcycle battery, are the power requirement the same as a full Arduino board? and would the ground pin run to the motorcycle frame/chassis?

Many thanks.
5  Using Arduino / Motors, Mechanics, and Power / Motorcycle light-show mod on: January 19, 2013, 08:52:22 pm
Hi everyone,

I’m looking for some advice on what to read-up on to help me with my idea.

I’d like to program the Arduinos IC chip for use on a motorcycle. It will be controlling a lighting mod kit which consists of LEDs, Halos and HID projector head lights.

My IC needs to know when:
1. parking lights are on
2. Head lights are on high beam or low beam
3. Start motor is engage (or switch for SM is depressed)

To get a compatible signal input for the IC chip, is it just a matter of running some automotive cable from the lights/SM and have an appropriate resistor on a PCB? Will it this affect the normal running of the lights/SM in anyway?

Also, for the IC output signal, can anyone offer advise on the use of a Releay/MOSFET or something else to get the appropriate voltage to control the lights? I’d like to be able to have the LEDs strobe when showing if this makes a difference

I didn’t want to put anyone off with a long post so have attached an image for reference. I’m happy to offer more information on requirements. Basically, with software I have a whole lot of control over how my lighting mod works once the IC is integrated. And I can change without rewiring. I can have show(off) mode and everyday riding mode :o)
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