Ah, thanks! I have actually seen that video ages ago

I was wondering about what I need for parts in the case of resistors etc.

I've been looking into making my own lab bench power supply out of the PSU of an old computer. I've seen a lot of videos on YouTube, but I just wanted to make a thread about it here just in case someone has already done it and can share some experiences.

The idea came after I figured out it could be nice to easily switch between 3.3, 5 and 12 V power when testing out my Arduino components.

Would be awesome if you made a fritz sketch of this

@Oitzu Thanks! I'll try that one out

Thanks to both of you @LastSamurai and @gohan, that seems to solve alot of issues regarding the noise.

However I experience some strange values when connecting Arduino directly to the battery. The power to the LED not 0 volts (as it is when powering Arduino and radio from FTDI programmer), but 2.8 volts. And around 3 volts when pressing the doorbell button. I can't quite figure out why it acts like this. Not only that, but the digital pin connected to the anode side of the LED gives power to the Arduino itself.. Even when I disconnect VCC/Ground on the Arduino from the batteries, the Arduino gets power through the digital pin. I didn't even know that was possible.

Not sure what doorbell type it is, but it's a cheap one bought at my local supermarket.

Wow @AWI that looked more advanced than I thought..

@Oitzu do you have a recipe for making such low-pass filter?

I am experiencing issues with the NRF24 radio module when powering the Pro Mini off a step-up regulator, stepping up from two 1.5 volts batteries to 3.3 volts. When I connect the Pro Mini to an FTDI programmer everything works as normal.

A while ago I read that regulators created an electromagnetic field that could cause interference with the radio module. My tests seems to confirm this.

Is there some way I could eliminate , limit or somehow "enclose" the electromagnetic field generated by the regulator?

Thanks @gohan it works perfectly using a digital pin and the door sensor example.

I have a very simple wireless doorbell in my house, and I was thinking of making it notify me when someone rings in Domoticz.

I have minimal with electronic components, but I do have the basics with resistors, wires, NRF24 etc.

What I found out, is that when the doorbell button is clicked, it sends a wireless signal to the other unit, containing the speaker. This unit has a LED that lights up when it receives a signal, aka when someone rings the bell.

I was thinking of connecting the Arduino to this LED, detecting when the LED is turned on. I connected the cathode on the LED to ground on the Pro Mini, and the LED's anode to an analog pin on the Pro Mini. Now I can read values around ~740 in standby mode, and around ~860 when the LED lights up.

Is this a basic and "fail safe" method to check for power? Or is it varying too much? I want to use the door magnet sensor example to detect the doorbell, but not sure if I should use the Bounce library with analog signals.

Thanks in advance!