Hi, I have an application that has gone askew.
I'm building a 64 nozzle animated fountain & have used an 8x8 LED matrix from eBay as an indicator mounted on the front panel.
These LEDs have worked perfectly for development, until I connected the solenoid array & then they burned out almost immediately.
As the controller was switching the valves the LED Columns were illuminating when only a single valve was open. Then the whole unit cooked.
I'm not great with component level electronics & I'm sure I've made more than one mistake with the protection.
The 64 solenoid valves are wired in a grid configuration and switched using 16 Relays.
The 8x8 LED Matrix is connected to the same relay terminals with a 1.2k resistor on the positive (see diagram).
The data sheet for the LED Array is not flush with details so the resistor values are just a guess.
My questions are these:
- Would resistors on the negative terminals help matters?
- Should I be using different Resistor values?
- Is my circuit woefully under protected & in need of total redesign?
Thanks for looking in.
I'm building a 64 nozzle animated fountain & have used an 8x8 LED matrix from eBay as an indicator mounted on the front panel.
These LEDs have worked perfectly for development, until I connected the solenoid array & then they burned out almost immediately.
As the controller was switching the valves the LED Columns were illuminating when only a single valve was open. Then the whole unit cooked.
I'm not great with component level electronics & I'm sure I've made more than one mistake with the protection.
The 64 solenoid valves are wired in a grid configuration and switched using 16 Relays.
The 8x8 LED Matrix is connected to the same relay terminals with a 1.2k resistor on the positive (see diagram).
The data sheet for the LED Array is not flush with details so the resistor values are just a guess.
My questions are these:
- Would resistors on the negative terminals help matters?
- Should I be using different Resistor values?
- Is my circuit woefully under protected & in need of total redesign?
Thanks for looking in.