.:madworm:.'s photos with the keyword: sensor

Fresnel is everywhere

Fresnel is everywhere

.:madworm:.
28 Apr 2012 156
Added a description.
Upgrades!

Upgrades!

.:madworm:.
28 Apr 2012 136
Now it works with IR + PIR control. I had to sacrifice the onboard LED for that. Why aren't there any DIP-10 chips?
Plugged right into the ISP header.

Plugged right into the ISP header.

.:madworm:.
28 Apr 2012 149
Added a description.
And this is why...

And this is why...

.:madworm:.
28 Apr 2012 114
gloves / tweezers were invented.
Quite small PIR sensor

Quite small PIR sensor

.:madworm:.
28 Apr 2012 148
Sensitivity is not adjustable. Range is a couple of meters. It needs some external intelligence to be useful as a lamp controller (off-time hysteresis). By changing the position of a 0-Ohm resistor (from L to H) it can be adjusted to re-trigger-able mode. When using a micro this is not really necessary.
tiny PIR board

tiny PIR board

.:madworm:.
28 Apr 2012 112
It barely covers the tip of my thumb.
Junghans Radio Clock

Junghans Radio Clock

.:madworm:.
22 May 2010 111
A light sensor. It is used to activate the backlight by waving your hand over it. It probably detects IR.
Optical smoke sensor

Optical smoke sensor

.:madworm:.
01 Jul 2013 299
With no small particles in the air, the IR beam goes straight into the wall of the housing. The wall is black and absorbs a great deal of the radiation. The little fins might be angled in such a way that the reflected radiation bounces around many times, which further attenuates it. Ideally nothing ever hits the sensor. The main purpose of this construction is to allow smoke-carrying air penetrate the walls, but keep ambient light out. When tiny smoke particles are present in the center of the sensor, they scatter some of the IR light towards the sensor. You hear a very load beep.
Optical smoke sensor

Optical smoke sensor

.:madworm:.
01 Jul 2013 205
The MC145010P is the brains of the circuit.
Optical smoke sensor

Optical smoke sensor

.:madworm:.
01 Jul 2013 194
The MC145010P is the brains of the circuit.
Smoke detector - PCB

Smoke detector - PCB

.:madworm:.
01 Jul 2013 206
Smoke detector - PCB

Smoke detector - PCB

.:madworm:.
01 Jul 2013 189
The MC145010P is the brains of the circuit.
Smoke detector - weak buzzer

Smoke detector - weak buzzer

.:madworm:.
01 Jul 2013 157
Smoke detector / alarm

Smoke detector / alarm

.:madworm:.
01 Jul 2013 185
Capacitive slider test

Capacitive slider test

.:madworm:.
19 Jul 2012 143
I found this sort of design in a Microchip appnote. If it works well enough, I might consider it for future projects. It should be good for otherwise unused pins and doesn't cost anything extra. I think I will have to get a cap-meter. Jyetech has a pretty cheap kit that can measure from 1pF to 500µF. The pF-range should be useable for the sensor pads. That way I can do without guesswork when selecting the size of the storage capacitor. I'm planning to use a timer-based repetitive charge-transfer-method to measure pad capacitance, not the more simple RC-timed method.
IR reflex sensor

IR reflex sensor

.:madworm:.
28 Feb 2012 135
Fortunately the IR transmission of acrylic sheets is pretty high, so it can be used to detect objects behind them. Unfortunately the range is just a few mm. And I need to get rid of the nice little breakout board, as it is too thick. Why didn't they use 0.5mm laminate. I'll have to pull the thing off and glue it directly on-top of the micro.