From a8ee5e1b11a98baeb028f0b596949640863788b8 Mon Sep 17 00:00:00 2001
From: Artem Sheremet <dot.doom@gmail.com>
Date: Sun, 12 Apr 2026 09:54:40 +0000
Subject: [PATCH] Add board and pin annotations for heating-og

---
 heating-og.yaml | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/heating-og.yaml b/heating-og.yaml
index 641c1ba..548734b 100644
--- a/heating-og.yaml
+++ b/heating-og.yaml
@@ -8,6 +8,10 @@ esphome:
     version: "2.0"
 
 esp32:
+  # Dingtian DT-R008 board rev 3.6.(9+) from January 2025 for $31.
+  # Header pinout above Ethernet port:
+  #
+  # GND | IO3 (RX) | IO1 (TX) | NRST | IO0 | 3V3 | IO4 | IO5
   board: esp32doit-devkit-v1
   framework:
     type: esp-idf
@@ -45,12 +49,14 @@ text_sensor:
 
 sn74hc595: # write
   - id: 'sn74hc595_hub'
-    clock_pin: GPIO14 # SRCLK
-    data_pin: GPIO13 # SER
-    latch_pin: GPIO15 # RCLK
+    clock_pin: GPIO14 # SRCLK (serial clock)
+    data_pin: GPIO13 # SER (serial input)
+    latch_pin: GPIO15 # RCLK (latch for outputs)
     oe_pin: GPIO32 # OE
     sr_count: 8
 
+# GPIO16 is the data pin for 165 serial output, clock and latch are shared.
+
 switch:
   - platform: gpio
     restore_mode: RESTORE_DEFAULT_OFF