Hi,
I've not been active in the community quite some time now, but I just got an itch to try something. While my old RaspberyPi 2 has the component output, I have a SCART only CRT TV. I know that I could just buy a composite cable and composite to SCART adapter but where's the fun in that. I asked chatGPT if the PI is capable or RGB output directly to the TV and the answer was yes. CHAT drew up this schematic for me. Now I know better then to fully trust AI, and that SCART voltages could potentially fry the Pi. I'm good with soldering but lousy with actually understanding electronics![😅]()
. As far as I understood the pi outputs RGB through the GPIO and I have to make a voltage divider for the signal to work. The composite output acts as the SYNC/BLANKING signal. Is this even possible with just resistors and some modifications to the piOS, or would this require some more logic behind it?
I've not been active in the community quite some time now, but I just got an itch to try something. While my old RaspberyPi 2 has the component output, I have a SCART only CRT TV. I know that I could just buy a composite cable and composite to SCART adapter but where's the fun in that. I asked chatGPT if the PI is capable or RGB output directly to the TV and the answer was yes. CHAT drew up this schematic for me. Now I know better then to fully trust AI, and that SCART voltages could potentially fry the Pi. I'm good with soldering but lousy with actually understanding electronics
. As far as I understood the pi outputs RGB through the GPIO and I have to make a voltage divider for the signal to work. The composite output acts as the SYNC/BLANKING signal. Is this even possible with just resistors and some modifications to the piOS, or would this require some more logic behind it?Code:
Raspberry Pi 2 GPIO Resistor Divider SCART PinGPIO 17 (Red) ──┬── 330Ω ───┐ │ ├───> SCART pin 15 (Red in) └── 470Ω ───┘GPIO 22 (Green) ─┬── 330Ω ───┐ │ ├───> SCART pin 11 (Green in) └── 470Ω ───┘GPIO 24 (Blue) ──┬── 330Ω ───┐ │ ├───> SCART pin 7 (Blue in) └── 470Ω ───┘Pi Composite Out ─────────────> SCART pin 20 (Sync in)GPIO 18 ─────────── 180Ω ───┬────────> SCART pin 16 (RGB select – 1–3V = RGB mode) └────────> SCART pin 8 (Aspect ratio – 5V = 16:9, 12V = 4:3)SCART pin 17, 13, 9 ──────── GND (connect to Pi GND)SCART pin 21 ─────────────── SHIELD (optional GND)Statistics: Posted by winnetouch — Tue Jul 08, 2025 9:05 am