Two years ago I used wled and WeMos for my Christmas light display. Lots of hand made wiring.
Decided i wanted to learn how to make a pcb and play more with Wled.
This is what I made…
5 outputs
Screen which tells me if it working via xlights or wled
Thermal sensor (which is always 3 degrees wrong)
Relay to power of the PSU for the lights
Nice project, I was trying to do a similar project on my own. Could you share the pcb file? I really want to learn how to do a project similiar like this.
Hi, really locks like wonderfull project. I am trying exctly now to do something that really work very well.
I am experiencing some probles with ESP32 MCU when connecting with 74HCT125 a lot of noise…
In your project I see you use a Bus Transiver 74245. Why do you use this component?
Would be possible to share with me the Schematic and the firmware that you used or modified?
I really loved the idea of an OLED Display…
The 74HCT245 is essentially an 8 port version of the 74HCT125 (only 4 ports) they are very much the same type of IC.
Couple of things to watch out for if you’re getting “noise” (flickering, jitters, etc) on your strips:
Make sure all unused inputs on your 74HCT125 are set to +5v or 0V, don’t leave any inputs disconnected or “floating”. That’s a common way to cause all kinds of noise issues.
Make sure you have a 100nF (0.1 uF) disc ceramic capacitor connected near the Vcc pin and going to ground. This is a standard power supply bypass capacitor and another way to decrease noise.
For long term reliability, you’ll want to tie those pins Hi (or Lo).
You can use something like a 10K pull-up resistor so those inputs could easily be used in the future.
Floating inputs is a sure way to get “unexplained results”…
As long as you tie the input(s) to a fixed Hi or Lo, it won’t affect stability. Remember to associated tie the OE input as well. On the 74xxx125 devices, that’s another 4 lines to keep track of…