View allAll Photos Tagged pwm
Testing the PWM power-up circuit. It uses a MAX1724 to generate 5 volts from a lower voltage, in this case from the 3.7 volt battery. This is useful because things like the BlinkM and other external devices prefer 5 volts rather than the 3.3 volts that other useful things prefer (like the real-time clock there on the right, or the digital accelerometer there on the upper left, or the 2-channel capacitive touch sensor on the botton left.)
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It's got 16 5chip 1/2 LEDs. Most of them are cool-white now. Initially it had 50%/50% cool/warm-white, but the warm-white ones have died prematurely - for unknown reason.
This one still uses an ATtiny2313 as the brain, but I think I'll switch to a Mega48/88 later. It's got a real SPI unit, which can send out the data much quicker than the 2313's USI unit. This is crucial, as the PWM interrupt must finish very quickly for proper performance.
Air Force One Touches down at Portland International Jetport in Maine. I-295 in the foreground, shot taken at Mercy Pond in Portland.
British Rail Departmental diesel shunter locomotive PWM 654, Rowsley South. Saturday 07 September 2019
Photograph copyright: Ian 10B.
24 individual 12-bit PWM, current control (no resistors), non-multiplexed (full brightness, no risk of damaging LEDs if multiplexing freezes)
Update: source of TLC5947 chips
Gracias a todos por vuestros comentarios y reconocimientos...
Por favor, no use esta imagen en los sitios web, blogs u otros medios de comunicación sin mi permiso explÃcito - Todos los derechos reservados ©.
Please don't use this image on websites, blogs or other media without my explicit permission - All Rights Reserved ©.
A finely enamelled silver medal issued by the Equitable Friendly Society PWM (Past Worshipful Master) and complete with an attached fob chain. This was awarded to a H. B. Hazell in 1918 either for services rendered to the society or for being a long-term member of the society by the Equitable Friendly Society.
en.wikipedia.org/wiki/Friendly_society (about Friendly Societies).
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DESCRIPTION:
Size (medal): 1 3/32" across (28mm).
Material(s): sterling silver. The fob chain probably silver as well.
Finish: n/a.
Fitting: Bale & suspension ring with a short fob chain attached.
Imprint: silver hallmarked for Birmingham 1918 (t). Maker's make HS LTD for Henry Slingsby Ltd. Hand-engraved H. B. HAZELL 1918