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Testing the pulse width modulator code...
So many little errors in my code (direction, bit length, off-by-one...)
"Yikes! And away! *smash* Yikes! And away! *smash*..."
PWM speed > 400Hz. Good for digital camera and video recording.
New type aluminum die-cast housing, specially designed for high power LEDs, nice outlook and better cooling effect
Stable-current LED drive for low heat output
Auto operation with built-in programs
DMX operation. 8 DMX channels.
Programmed when connected to a DMX controller
Sound-activated operation, two modes
Master-slave operation
Lamp: 54x3W (Red 18+ Green 18 + Blue 18 ) LEDs
Voltage: AC 90 - 250V
SMPS: 28V 200W
Shipping information
Dimension: 240x240x240mm
Packing: 260x260x260mm
Net weight: 4.5kgs
Gross weight: 5.6kgs
rgbw 1w or 3w can do to your need
54x1W /3W(Red 12 + Green 14 + Blue 14 + White 14) LEDs
Make Controller Kit with a scavenged talking mickey mouse servo. You can see where the 3 wires of the potentiometer hooks into the right analog to digital input, and where the 2 lines for the servo motor output hookup to the PWM output on the right.
PWM654 is seen at the Heritage Shunters Trust Gala at Rowsley on 2nd September 2018. Note the teddy bear mascot (above the Ruston plate) that came with the locomotive when it arrived at Rowsley.
Works nicely - once the soft-start capacitor has been removed and a 10k pull-down resistor has been added.
Gracias a todos por vuestros comentarios y reconocimientos...
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1934 Wickham Trolley Number 748, Type 17, Works Number 1580 with trailer wagon which was also converted from another Wickham Trolley, a 1948 Type 17a, number PWM 3189, works number 5019 at Highley on the Severn Valley Railway on the 28th of October 2017
Basic block diagram. Won't be too much more involved than this. One transistor and a couple of resistors and we're done.
0.1ms/div
2V/div
CH1: Row 1 UDN2981A
CH2: Row 4 UDN2981A
The output of the led matrix row source driver. The signals overlap which explains the ghost images. This was measured without load btw.
I need a digital scope with deep memory to have a look at this type of signal more closely. Triggering is very hard, as there is always some jitter and the signal is not necessarily periodic.
Minimal effort to get started with the Macroblock MBI5030 PWM LED driver. Comes with onboard LEDs, but can still drive external ones. All pins broken out. Only needs a microcontroller and a high-frequency grayscale clock. An AVR running at 16MHz can use its CLOCK-OUT pin for the latter. The chips 'speaks' an SPI-like protocol. Unfortunately some information is encoded in the timing of the LE input, so one cannot use fast hardware SPI for the hole transfer. The special sequences must be bit-banged. Nevertheless it is a rather affordable chip and does mostly what it should. There is an issue with the datasheet(s) that can be found on the web. The older ones document functions that definitely are not implemented in the current silicon.