i would like to share my latest prototype - the handschmeichler 4.0. Goal was to build an edc that will fit inside the small pocket on the right side of your jeans.
Some technical details about the hardware:
- 1 x 128 Gbyte USB Storage
- 1 x Atmel 32u4 µC
- 2 x Osram Oslon high Cri
- 1 x Osram Oslon Deep Red
- 1 x Nichia NCSU276A
- 1 x Bosch BME280
- 1 x TCS34725
- 1 x ADXL345
- 1 x selfmade 7135 driver
- 1 x Oled 128x32 Display
6 x tritium vial
it can messure:
- air temperatur
- air humidity
- air pressure
- altitude
- brighness in Lux (very accurate)
- light color in kelvin
- max lux memory
angle (spririt bubble)
to turn on the light, there is a classical switch on the side. to change the brighness there is a poti beside the switch. to change the color from white to red or 365nm uv you have to long press the button when first page (flashlite page with battery status, brighness level status and led color information) is displayed.
to change to the next display site you have to short click. each page have some special function with long oder doubleclick.
the software takes more then 40 hours to complete. i´m not a complete noob in that, but also no specialist. the mechanical side takes more then 50 hours to complete. there was many work to fit all parts inside. the display circuit board alone tooks more the 3 hours, cause there was a lot to do to small down to fit inside.
That is quite different from the average flashlight, a great custom build! Out of curiosity a few questions:
-what are the drive currents for the leds?
-are those small lenses before each led? and if they are plastic, does that interfere with the output of the Nichia (365nm version?)
-I’d love a look at the inside!!
-(my pet-subject ) you state that the luxmeter is very accurate (accurate luxmeters are tricky to make), what sensor did you use, what is the Vlambda curve of the sensor and how does it deal with light that comes in from an angle (I see it has no diffusor)?
the sensor can also messure rgb values, so there are some things more possible. first i´d like to include a rgb led, but i discarded that cause the space is really limited.
i did some messurements compared with my lx133 luxmeter, and the results where pretty good for this smal device. i don´t say this is accurate by <1%, but good for make some messurements when outside.
Out of curiosity a few questions:
) you state that the luxmeter is very accurate (accurate luxmeters are tricky to make), what sensor did you use, what is the Vlambda curve of the sensor and how does it deal with light that comes in from an angle (I see it has no diffusor)?