2-switch panel โ€” DMWD momentary halo-LED on Modbus IO

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switch_panel_2sw 2014 RAM 1500 Carputer โ€” SWITCH PANEL, 2x DMWD 12mm momentary halo-LED buttons (Rock + Fog) on the Modbus IO 8CH Each switch = 4 pins (NO + COM contact, LED+ + LED-).  Contact -> a DI (signal only).  LED -> a DO (Waveshare drives it = shows true state). LED is 12-24V with a BUILT-IN resistor: LED+ to 12V, LED- to DO, NO external resistor.  Verify pin polarity with a meter (markings are tiny). LEGEND:   blue = contact->DI   ยท   green = LED- ->DO (sink)   ยท   red = +12V   ยท   black = GND   ยท   magenta = RS485   ยท   purple dashed = DO->relay sw1 SWITCH 1 โ€” ROCK (DMWD 12mm momentary) pin NO pin COM pin LED+ pin LED- gnd GND rail (panel) sw1:com->gnd COM->GND mod Modbus RTU IO 8CH @ PANEL (SKU 26244) โ€” RS485 slave addr 2 DI1 (rock btn) DI2 (fog btn) DO1 (rock LED) DO2 (fog LED) V+ 7-36V GND RS485 A RS485 B sw1:no->mod:di1 NO->DI1 (24 AWG) sw1:lm->mod:do1 LED- ->DO1 (sinks when ON) sw2 SWITCH 2 โ€” FOG (DMWD 12mm momentary) pin NO pin COM pin LED+ pin LED- sw2:com->gnd sw2:no->mod:di2 NO->DI2 (24 AWG) sw2:lm->mod:do2 LED- ->DO2 v12 +12V rail (panel) fused ~1-2A at the house bus v12->sw1:lp 12V->LED+ v12->sw2:lp v12->mod:v module power gnd->mod:g ctrl Waveshare ESP32-S3 8DI-8DO โ€” RS485 MASTER holds rock + fog STATE (source of truth) RS485 A RS485 B DO rock DO fog mod:a->ctrl:a RS485 A (Cat5 pair1) mod:b->ctrl:b RS485 B r_rock Bosch relay (rock) relay/fuse box ctrl:rk->r_rock DO trigger r_fog Bosch relay (fog) relay/fuse box ctrl:fg->r_fog DO trigger note WIRING FOR 2 SWITCHES โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€ Panel jumpers (switch <-> module): 22-24 AWG (solid Cat5 strands fine) โ€” signal/LED only, mA. Per switch: NO->DIx, COM->GND rail, LED+->12V rail, LED- ->DOx.  Share the 12V + GND rails. Conductors used on the module: 2 DI + 2 DO + V+ + GND  (room for 6 more switches). ONE cable home (module -> Waveshare): solid Cat5 โ€”   pair1 = RS485 A/B   ยท   pair2 = 12V + GND   ยท   2 spare pairs.   120R termination at each bus end only if the run is long/fast. SHOPPING (2 switches):   2x DMWD 12mm momentary halo-LED (buy MOMENTARY 5-pack)   1x Modbus RTU IO 8CH (handles up to 8 switches)   panel 12V tap + 1-2A inline fuse ยท 2x WAGO/term blocks (12V + GND rails)   1x solid Cat5 home ยท ferrules for screw terminals ยท (2x 120R if long bus)   LED draw ~15-20mA each โ€” the 500mA DO sinks it easily.   Dash hole = 12mm (1/2").  Debounce the buttons in ESPHome. rock ROCK LIGHTS (house 12V, fused) r_rock->rock switched + fused fog FOG LIGHTS (house 12V, fused) r_fog->fog switched + fused house +12V always-on house bus house->v12 tap + 1-2A fuse

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