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--- tg_mqtt_relay_4_may_2019 [2019/05/14 14:21] – created 192.168.1.36
+++ tg_mqtt_relay_4_may_2019 [2019/05/14 14:27] (current) – 192.168.1.36
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 This project is for the KB light stand watering.  A Chinese 4 relay board is driven by a Boarduino.  The boarduino gets relay on/off commands from the ESP8266 serial line.  The ESP8266 is used as a WiFi and MQTT co-processor.  The ESP8266 attaches to the WiFi and decodes MQTT commands.  A single character is output on the serial line to the Boarduino.  The characters chosen and their function is as follows:
-|Command| Character|
+^Command^ Character^
 |Rly 1 on|'0'|
-|Rly 2 on|'1'|
+|Rly 1 off|'1'|
+|Rly 2 on|'2'|
+|Rly 2 off|'3'|
+|Rly 3 on|'4'|
+|Rly 3 off|'5'|
+|Rly 4 on|'6'|
+|Rly 4 off|'7'|
+{{::mqtt_h2o_relay_board.jpg|}}