I’ve been tasked to do an LED light install for a machine owned by a local company.
The dimming circuits I’ve made don’t work quite as well as I’d hoped. The dimming only occurs over about the first 1/4 turn of the pot before hitting max output. Strangely, my DMM shows 7V when the pot is open, even though it is being fed from a 3.3v source…
As per the datasheet, the dimmer input works from 0.3-2.5 volts. I used a 3.3V dc/dc converter to feed a voltage divider made from a log taper 1k ohm pot and a 150 ohm resistor. A 300 ohm resistor should be slightly better in hindsight, and I did try two 150’s in series with marginal improvement.
Any suggestions?
Edit:
For future reference: there are 2.5v dc/dc converters. It might be worth trying one of those with a pot rather than making a voltage divider with a higher voltage source like I did.