Tag: LED

Harvesting components!

Last night I had my first go at harvesting electrical components from junk PCBs I had lying around my room.
I found what used to be an optical mouse. But was now just sitting on a pile of junk and cables

I was hoping to find a 0.1microFarad capacitor to perform a mod on a USB to serial adapter I have for programming my arduino mini pro clones, to add auto reset.
While I’m getting pretty damn good at releasing the reset button at the right time, I would prefer to just hit upload!

So I looked all over this little PCB and was in luck! I found a 104 capacitor!
(I had looked over an old PCI fax modem before this and no luck)

So how I went about it was by holding components upright with needle nose pliers,
Then heating / melting the solder on their connections, until the weight of the PCB pulls the components through.
This kept the legs pretty free from excess solder too. 🙂

I got some switches, an LED, some resistors and some capacitors!
I’ll put a photo on this post showing my haul.

It was easier than I expected and makes me want to just… Collect old junk, to harvest what I want so I don’t keep buying a cap here, a diode there, etc.

image

dump of plans, thoughts and ideas

Backup battery for ceiling arduino, mount to proto shield, put in case

AC to 5v transformer.

Emergency lighting

Crude Diagram:

AC>5vDC>Batt>Arduino>LED
>—->3.3v^

5v power supply also connects to 3.3v regulator, which arduino reads, when this drops to 0v turn on led_pin.

Ping method won’t work on light because its offline! Doh!

if(ping 192.168.1.1 = reply){

digitalWrite(4, HIGH);

else({

digitalWrite(4, LOW);

}

Arduino pro mini based light switch

Send same on/off signals as http requests (30/31)

3 indicates start bit

Second bit is state to switch relay.

Purchase or make two position momentary wall mount switch and wire buttons up to send signals to light.

Ethernet arduino add motor shield and use directly for blinds control or use separate mini arduino ?

Undecided. Probably mini.

Can adapt existing code for light to operate blinds servo or stepper motor.

And can easily send different control bits from existing code in etherten. Easy to add more sections ! 😀