From 81bd58206d769e4aecfdedc81bf6e9f4ad880d75 Mon Sep 17 00:00:00 2001 From: Wesley Ray Date: Fri, 12 Jun 2026 11:42:21 -0400 Subject: [PATCH] canbus: note pigtail wiring colors (green=CAN-L, blue=CAN-H) Co-Authored-By: Claude Opus 4.8 --- canbus/HANDOFF.md | 1 + canbus/README.md | 1 + 2 files changed, 2 insertions(+) diff --git a/canbus/HANDOFF.md b/canbus/HANDOFF.md index 8e87aee..2de992f 100644 --- a/canbus/HANDOFF.md +++ b/canbus/HANDOFF.md @@ -36,6 +36,7 @@ state + what's left. (the one with the terminator), per `README.md` → "Physical connection". ⚠️ Meter the port first: data idles ~2.5 V, power reads ~12 V; 12 V on CAN-H/L destroys the transceiver. + - **Pigtail wiring (as crimped):** green = CAN-L, blue = CAN-H. - **GPIO:** transceiver `CTX/D` ← ESP32 `GPIO5` (tx_pin), `CRX/R` → `GPIO4` (rx_pin). Adjust `substitutions:` in the YAML if you wire differently. diff --git a/canbus/README.md b/canbus/README.md index 5bb0abb..21776fe 100644 --- a/canbus/README.md +++ b/canbus/README.md @@ -240,6 +240,7 @@ re-light. 4. Land the two wires on the transceiver's CAN-H / CAN-L. The transceiver's onboard 120 Ω re-terminates that end (keeps exactly 2 terminators: controller + your node). **Never** add a terminated node in the *middle* of the bus. + - **This rig's pigtail (as crimped):** **green = CAN-L, blue = CAN-H.** 5. Revert = unplug, re-seat the terminator. CAN-H vs CAN-L: harmless if swapped — the bus just goes silent; flip the two