Phone Vibrator Demo

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LED Driver Roundup

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LEDs being current, rather than voltage operated devices require special driver circuits for optimal performance.  While simple applications like an indicator light that might be run at a fraction of it's rated capability, a series current limiting resistor is sufficient.  High power application running at the edge of the LED's max current rating require active regulation to compensate for the negative temperature coefficients of the LED, (measurement techniques are discussed in this university lab paper .) Low power LEDs can be driven with simple series resistor current control when powered from a regulated power supply. The LED Load Line graph be low helps one select a standard resistor value to get the ballpark current setting with a 5 volt power source.  Find where your LED's color line intersects the desired current, then pick the closest resistance line below that intersection. (This graph is from LEDnique.com , a collection of basic articles on LEDs aime...
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Holographic Fans Getting Real Time HDMI Input

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  More advanced Raspberry Pi Pico (rp2040) Scope and Logic Analzes functions. While the rp2040 processors are nothing special (ESP-32 benchmarks are faster) the PIO circuits, programmed a bit like FPGAs, can offload timing critical functions from the processors. Applications of the original logic analyzer sample code can sample a signal at 125 Mega samples per second (more with overclocking).  Those $8 analysers' 16 MSPS are just OK for ancient Arduino chips. An aside:        Eben Upton notes the complementary capabilities of the rp2040 and the PIO vs the Linux Pi's:         Has better "deterministic latency" vs the big Pi.  ( chip design cost: £3–4 million )      ( First of a 12 video series on programming the rp2040 PIO ) The first generation of example projects capture data to a .csv file to be read by the Sigrok PulseView waveform analysis application, this workflow didn't quite suite me. (I briefly gla...
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