| Electronics > Beginners |
| DMX controlled lightstrip |
| (1/2) > >> |
| jimbo493:
So i purchased a cheap LED moving light off of eBay with the intent of breaking it down and using it to control two RGB led tapes and a couple steppers, since that is all it is. I guess i kinda hoped that the LEDs would be running at the same voltage as the strips, bt the strips take 12v and ive only found variable voltage on the mover from about 0-2.8 volts. I was wondering if theres an easish way to use that as a control signal for a 0-12v led driver. Or somehow using one of those IR controllers for them and using the regulation circuitry from that and the control signal from the mover. I want to use the mover so that I can control it over DMX in a theater. Hers some links and images: Mover eBay page: https://www.ebay.com/itm/50W-Stage-Light-Lighting-RGBW-Wash-Remote-DMX512-Auto-Moving-Head-9-15CH-E2G6/361974002221?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649 Mover LED board, the connector provides 13.5v and control signals for all 6 LED colors(0-2.8v approx.) https://photos.app.goo.gl/UGG1GdpnBoSPJBLD8 IR control board for LED tape: https://photos.app.goo.gl/FpuxeKuTuqRGo37e2 I have some knowledge in electronics, but this is really over my head. So much for the simple tack and go. Thanks a bunch, Jimmy |
| james_s:
2.8V sounds like the typical forward drop of an LED, they are current driven devices so the voltage will be dependent on the characteristics of the specific LED. Your LED strips will have groups of several LEDs in series with a current limiting resistor for each group. It looks to me like there are drivers integrated into the LED board, can you find a datasheet for those chips? The DMX decoder likely puts out logic level PWM signals that you could use to control any LED driver with a PWM input, or just use some mosfets to control LEDs powered by whatever voltage you want. This shouldn't be very difficult but is likely to require a bit of reverse engineering. |
| jimbo493:
The 0-2.8v signal comes out of the micro on the mainboard attached. The LED board seems to have 6 driver circuits for the 6 different colors in the LED. The SOT23 I can't seems to get a datasheet for. This is what is on the chip --- Code: ---M17201 D1726HC --- End code --- I assume all the signals are created on the micro, are you saying I could buy a PWM driver and then just take those lines for each color(Could I get an example?)?Do you think the drivers in the IR board are PWM? Unfortunately I dont have an oscilloscope which makes this a bit annoying. Thanks for the help |
| james_s:
What did you measure that 0-2.8V signal with? There's a good chance it's not an analog voltage, but a PWM signal that varies in duty cycle. You'd need an oscilloscope to know for sure. If it's PWM you can just drive a transistor or mosfet with it and use that to control the LEDs. |
| Lathe1982:
thanks a lot for this thread with so many details, photos and links to steroids online! i found it super helpful as i found lots of useful information. would really appreciate if someone could answer James-s question as i got interested in it myself. thanks! |
| Navigation |
| Message Index |
| Next page |